Bump version to 0.4.4

Fix PostgreSQL migration race condition with advisory lock
Multiple containers starting simultaneously race on Alembic migrations against shared PostgreSQL. Use pg_advisory_lock so they wait in line. Also update SQLite bootstrap to detect post-migration databases.
2026-08-13 07:22:24 -06:00 · 2026-03-07 15:43:56 -08:00 · 2026-03-07 15:41:29 -08:00 · 2026-03-07 13:11:42 -08:00 · 2026-03-07 13:01:19 -08:00 · 2026-03-07 12:54:41 -08:00
55 changed files with 1826 additions and 1240 deletions
@@ -19,53 +19,9 @@ Turnstone gives LLMs tools — shell, files, search, web, planning — and orche
 - **Cluster dashboard** — real-time view of all nodes and workstreams, workstream creation with node targeting, reverse proxy for server UIs (only the console port needs network access)
 - **Cluster simulator** — test the stack at scale (up to 1000 nodes) without an LLM backend

-```mermaid
-graph LR
-    subgraph Clients
-        CLI[turnstone CLI]
-        UI[Browser UI]
-        SDK[SDK / API]
-        Discord[Discord / Slack]
-    end
-
-    Console[turnstone-console<br/><i>dashboard + proxy</i>]
-    Channel[turnstone-channel<br/><i>platform gateway</i>]
-
-    subgraph Cluster
-        Redis[(Redis MQ)]
-        DB[(PostgreSQL / SQLite)]
-
-        subgraph Node A
-            BridgeA[bridge]
-            ServerA[server]
-        end
-        subgraph Node B
-            BridgeB[bridge]
-            ServerB[server]
-        end
-    end
-
-    LLM[LLM Provider<br/><i>OpenAI · Anthropic · local</i>]
-
-    CLI --> ServerA
-    UI --> ServerB
-    SDK --> Redis
-    Discord --> Channel
-
-    Channel <--> Redis
-    Console --> Redis
-    Redis --> BridgeA & BridgeB
-    BridgeA --> ServerA
-    BridgeB --> ServerB
-    ServerA & ServerB --> LLM
-
-    ServerA & ServerB --> DB
-    Console --> DB
-    Channel --> DB
-    ServerA -.->|notify| Channel
-    BridgeA & BridgeB -.->|events| Redis
-    Console -.->|proxy| ServerA & ServerB
-```
+<p align="center">
+  <img src="docs/diagrams/architecture-overview.svg" alt="Turnstone system architecture — data flow from clients through gateways, Redis MQ, cluster nodes, to LLM providers" width="960"/>
+</p>

 ## Quickstart

@@ -5,8 +5,8 @@
 #   Default (SQLite):     docker compose up
 #   Production (PG):      DB_BACKEND=postgresql docker compose --profile production up
 #                         (or set DB_BACKEND=postgresql in .env)
+#   10-node cluster:      docker compose --profile cluster up
 #   With simulator:       docker compose --profile sim up
-#   Scale bridges:        docker compose up --scale bridge=3
 # =============================================================================

 name: turnstone
@@ -28,6 +28,7 @@ services:
    image: postgres:17-alpine
    profiles:
      - production
+      - cluster
    environment:
      POSTGRES_DB: turnstone
      POSTGRES_USER: ${POSTGRES_USER:-turnstone}
@@ -272,3 +273,219 @@ services:
      redis:
        condition: service_healthy
    restart: "no"
+
+  # ===================================================================
+  # 10-node cluster (profile: cluster)
+  #
+  # Each node is a server + bridge pair.  All share the same PostgreSQL
+  # and Redis instances.  Access via console at :8090.
+  #
+  # Start:  docker compose --profile cluster up
+  # ===================================================================
+
+  # -- cluster servers ------------------------------------------------
+
+  server-1: &cluster-server
+    build: { context: ., dockerfile: Dockerfile }
+    profiles: [cluster]
+    command: &cluster-server-cmd
+      - sh
+      - -c
+      - >-
+        turnstone-server
+        --host 0.0.0.0
+        --port 8080
+        --base-url "$${LLM_BASE_URL}"
+        --api-key "$${OPENAI_API_KEY}"
+        $${MODEL:+--model $$MODEL}
+        $${SKIP_PERMISSIONS:+--skip-permissions}
+    volumes: [turnstone-data:/data]
+    environment: &cluster-server-env
+      LLM_BASE_URL: ${LLM_BASE_URL:-http://host.docker.internal:8000/v1}
+      OPENAI_API_KEY: ${OPENAI_API_KEY:-dummy}
+      TAVILY_API_KEY: ${TAVILY_API_KEY:-}
+      SKIP_PERMISSIONS: ${SKIP_PERMISSIONS:-}
+      TURNSTONE_AUTH_ENABLED: ${TURNSTONE_AUTH_ENABLED:-}
+      TURNSTONE_AUTH_TOKEN: ${TURNSTONE_AUTH_TOKEN:-}
+      TURNSTONE_JWT_SECRET: ${TURNSTONE_JWT_SECRET:-}
+      MODEL: ${MODEL:-}
+      TURNSTONE_DB_BACKEND: ${DB_BACKEND:-postgresql}
+      TURNSTONE_DB_URL: ${DATABASE_URL:-postgresql://${POSTGRES_USER:-turnstone}:${POSTGRES_PASSWORD:?}@postgres:5432/turnstone}
+      TURNSTONE_NODE_ID: node-1
+    extra_hosts: ["host.docker.internal:host-gateway"]
+    networks: [turnstone-net]
+    depends_on:
+      redis: { condition: service_healthy }
+      postgres: { condition: service_healthy }
+    healthcheck:
+      test: ["CMD", "python", "/usr/local/bin/healthcheck.py", "http://127.0.0.1:8080/health"]
+      interval: 10s
+      timeout: 5s
+      retries: 3
+      start_period: 15s
+    deploy:
+      resources:
+        limits: { memory: 384M, cpus: '0.5' }
+    restart: unless-stopped
+
+  server-2:
+    <<: *cluster-server
+    environment: { <<: *cluster-server-env, TURNSTONE_NODE_ID: node-2 }
+  server-3:
+    <<: *cluster-server
+    environment: { <<: *cluster-server-env, TURNSTONE_NODE_ID: node-3 }
+  server-4:
+    <<: *cluster-server
+    environment: { <<: *cluster-server-env, TURNSTONE_NODE_ID: node-4 }
+  server-5:
+    <<: *cluster-server
+    environment: { <<: *cluster-server-env, TURNSTONE_NODE_ID: node-5 }
+  server-6:
+    <<: *cluster-server
+    environment: { <<: *cluster-server-env, TURNSTONE_NODE_ID: node-6 }
+  server-7:
+    <<: *cluster-server
+    environment: { <<: *cluster-server-env, TURNSTONE_NODE_ID: node-7 }
+  server-8:
+    <<: *cluster-server
+    environment: { <<: *cluster-server-env, TURNSTONE_NODE_ID: node-8 }
+  server-9:
+    <<: *cluster-server
+    environment: { <<: *cluster-server-env, TURNSTONE_NODE_ID: node-9 }
+  server-10:
+    <<: *cluster-server
+    environment: { <<: *cluster-server-env, TURNSTONE_NODE_ID: node-10 }
+
+  # -- cluster bridges ------------------------------------------------
+
+  bridge-1: &cluster-bridge
+    build: { context: ., dockerfile: Dockerfile }
+    profiles: [cluster]
+    command:
+      - turnstone-bridge
+      - --server-url=http://server-1:8080
+      - --redis-host=redis
+      - --redis-port=6379
+      - --heartbeat-ttl=${HEARTBEAT_TTL:-60}
+      - --approval-timeout=${APPROVAL_TIMEOUT:-3600}
+    environment: &cluster-bridge-env
+      REDIS_PASSWORD: ${REDIS_PASSWORD:-}
+      TURNSTONE_AUTH_TOKEN: ${TURNSTONE_AUTH_TOKEN:-}
+      TURNSTONE_JWT_SECRET: ${TURNSTONE_JWT_SECRET:-}
+    networks: [turnstone-net]
+    depends_on:
+      server-1: { condition: service_healthy }
+      redis: { condition: service_healthy }
+    deploy:
+      resources:
+        limits: { memory: 256M, cpus: '0.25' }
+    restart: unless-stopped
+
+  bridge-2:
+    <<: *cluster-bridge
+    command:
+      - turnstone-bridge
+      - --server-url=http://server-2:8080
+      - --redis-host=redis
+      - --redis-port=6379
+      - --heartbeat-ttl=${HEARTBEAT_TTL:-60}
+      - --approval-timeout=${APPROVAL_TIMEOUT:-3600}
+    depends_on:
+      server-2: { condition: service_healthy }
+      redis: { condition: service_healthy }
+  bridge-3:
+    <<: *cluster-bridge
+    command:
+      - turnstone-bridge
+      - --server-url=http://server-3:8080
+      - --redis-host=redis
+      - --redis-port=6379
+      - --heartbeat-ttl=${HEARTBEAT_TTL:-60}
+      - --approval-timeout=${APPROVAL_TIMEOUT:-3600}
+    depends_on:
+      server-3: { condition: service_healthy }
+      redis: { condition: service_healthy }
+  bridge-4:
+    <<: *cluster-bridge
+    command:
+      - turnstone-bridge
+      - --server-url=http://server-4:8080
+      - --redis-host=redis
+      - --redis-port=6379
+      - --heartbeat-ttl=${HEARTBEAT_TTL:-60}
+      - --approval-timeout=${APPROVAL_TIMEOUT:-3600}
+    depends_on:
+      server-4: { condition: service_healthy }
+      redis: { condition: service_healthy }
+  bridge-5:
+    <<: *cluster-bridge
+    command:
+      - turnstone-bridge
+      - --server-url=http://server-5:8080
+      - --redis-host=redis
+      - --redis-port=6379
+      - --heartbeat-ttl=${HEARTBEAT_TTL:-60}
+      - --approval-timeout=${APPROVAL_TIMEOUT:-3600}
+    depends_on:
+      server-5: { condition: service_healthy }
+      redis: { condition: service_healthy }
+  bridge-6:
+    <<: *cluster-bridge
+    command:
+      - turnstone-bridge
+      - --server-url=http://server-6:8080
+      - --redis-host=redis
+      - --redis-port=6379
+      - --heartbeat-ttl=${HEARTBEAT_TTL:-60}
+      - --approval-timeout=${APPROVAL_TIMEOUT:-3600}
+    depends_on:
+      server-6: { condition: service_healthy }
+      redis: { condition: service_healthy }
+  bridge-7:
+    <<: *cluster-bridge
+    command:
+      - turnstone-bridge
+      - --server-url=http://server-7:8080
+      - --redis-host=redis
+      - --redis-port=6379
+      - --heartbeat-ttl=${HEARTBEAT_TTL:-60}
+      - --approval-timeout=${APPROVAL_TIMEOUT:-3600}
+    depends_on:
+      server-7: { condition: service_healthy }
+      redis: { condition: service_healthy }
+  bridge-8:
+    <<: *cluster-bridge
+    command:
+      - turnstone-bridge
+      - --server-url=http://server-8:8080
+      - --redis-host=redis
+      - --redis-port=6379
+      - --heartbeat-ttl=${HEARTBEAT_TTL:-60}
+      - --approval-timeout=${APPROVAL_TIMEOUT:-3600}
+    depends_on:
+      server-8: { condition: service_healthy }
+      redis: { condition: service_healthy }
+  bridge-9:
+    <<: *cluster-bridge
+    command:
+      - turnstone-bridge
+      - --server-url=http://server-9:8080
+      - --redis-host=redis
+      - --redis-port=6379
+      - --heartbeat-ttl=${HEARTBEAT_TTL:-60}
+      - --approval-timeout=${APPROVAL_TIMEOUT:-3600}
+    depends_on:
+      server-9: { condition: service_healthy }
+      redis: { condition: service_healthy }
+  bridge-10:
+    <<: *cluster-bridge
+    command:
+      - turnstone-bridge
+      - --server-url=http://server-10:8080
+      - --redis-host=redis
+      - --redis-port=6379
+      - --heartbeat-ttl=${HEARTBEAT_TTL:-60}
+      - --approval-timeout=${APPROVAL_TIMEOUT:-3600}
+    depends_on:
+      server-10: { condition: service_healthy }
+      redis: { condition: service_healthy }
@@ -515,8 +515,8 @@ Returns a list of all active workstreams.
 ```json
 {
  "workstreams": [
-    {"id": "abc123", "name": "default", "state": "idle", "session_id": "a1b2c3d4e5f6"},
-    {"id": "def456", "name": "hacker-news", "state": "thinking", "session_id": "c5d6e7f8a9b0"}
+    {"id": "abc123", "name": "default", "state": "idle"},
+    {"id": "def456", "name": "hacker-news", "state": "thinking"}
  ]
 }
 ```
@@ -528,22 +528,21 @@ Each workstream object:
 | `id`         | string      | Unique workstream routing identifier                   |
 | `name`       | string      | Display name (alias if set, otherwise `ws-xxxx`)       |
 | `state`      | string      | Current state (see state values above)                 |
-| `session_id` | string/null | Session ID of the workstream's `ChatSession`, used for deduplication against `/v1/api/sessions` |

 ---

-### `GET /v1/api/sessions`
+### `GET /v1/api/workstreams/saved`

-Returns a list of saved sessions from the database, ordered by most recently
+Returns a list of saved workstreams from the database, ordered by most recently
 updated.

 **Response:**

 ```json
 {
-  "sessions": [
+  "workstreams": [
    {
-      "session_id": "a1b2c3d4e5f6",
+      "ws_id": "a1b2c3d4e5f6",
      "alias": "refactor",
      "title": "JWT Authentication Refactor",
      "created": "2026-03-01 10:00:00",
@@ -554,18 +553,16 @@ updated.
 }
 ```

-Each session object:
+Each saved workstream object:

 | Field           | Type        | Description                                |
 |-----------------|-------------|--------------------------------------------|
-| `session_id`    | string      | Unique 32-char hex UUID session identifier |
+| `ws_id`         | string      | Unique workstream identifier               |
 | `alias`         | string/null | User-assigned short name                   |
 | `title`         | string/null | LLM-generated title                        |
-| `created`       | string      | ISO timestamp of session creation          |
+| `created`       | string      | ISO timestamp of workstream creation       |
 | `updated`       | string      | ISO timestamp of last message              |
-| `message_count` | int         | Number of messages in the session          |
-| `node_id`       | string/null | Server node that created the session       |
-| `ws_id`         | string/null | Workstream the session belongs to          |
+| `message_count` | int         | Number of messages in the workstream       |

 ---

@@ -721,7 +718,7 @@ All fields are optional. The body can be empty or an empty JSON object.
 | `name`           | string | auto    | Workstream display name                                        |
 | `model`          | string | default | Model alias from the registry (`[models.*]`)                   |
 | `auto_approve`   | bool   | false   | Auto-approve all tool calls for this workstream                |
-| `resume_session` | string | ""      | Session ID to resume atomically during creation (empty = fresh)|
+| `resume_ws`      | string | ""      | Workstream ID to resume atomically during creation (empty = fresh)|

 **Response (success):**

@@ -472,7 +472,7 @@ independently, then returns the final content as the tool result.

 - **task**: uses `self._task_tools` (`TASK_AGENT_TOOLS` + MCP tools)
 - **plan**: uses `self._agent_tools` (`AGENT_TOOLS` + MCP tools). Writes output
-  to `.plan-<session_id>.md` — unique per `ChatSession` so concurrent workstreams
+  to `.plan-<ws_id>.md` — unique per `ChatSession` so concurrent workstreams
  don't collide. On repeat invocations the prior `plan` tool call and its result
  are forwarded from `self.messages` so the agent refines the existing plan rather
  than starting over. Planning instructions are injected as a developer message
@@ -688,8 +688,11 @@ memories
  created  TEXT NOT NULL
  updated  TEXT NOT NULL

-sessions
-  session_id  TEXT PRIMARY KEY
+workstreams
+  ws_id       TEXT PRIMARY KEY
+  node_id     TEXT NOT NULL
+  name        TEXT NOT NULL
+  state       TEXT NOT NULL DEFAULT 'idle'
  alias       TEXT UNIQUE            -- user-assigned short name (nullable)
  title       TEXT                   -- LLM-generated title (nullable)
  created     TEXT NOT NULL
@@ -697,7 +700,7 @@ sessions

 conversations
  id            INTEGER PRIMARY KEY AUTOINCREMENT
-  session_id    TEXT NOT NULL
+  ws_id         TEXT NOT NULL
  timestamp     TEXT NOT NULL
  role          TEXT NOT NULL        -- user | assistant | tool_call | tool_result
  content       TEXT
@@ -706,8 +709,8 @@ conversations
  tool_call_id  TEXT                 -- links tool_call ↔ tool_result for resume
  provider_data TEXT                 -- raw provider content (e.g. Anthropic encrypted)

-session_config
-  session_id  TEXT NOT NULL          -- composite PK with key
+workstream_config
+  ws_id       TEXT NOT NULL          -- composite PK with key
  key         TEXT NOT NULL
  value       TEXT

@@ -722,22 +725,20 @@ and are the single source of truth for both backends and Alembic migrations.

 | Method | Purpose |
 |--------|---------|
-| `register_session(session_id, title, node_id, ws_id)` | Create a sessions row (no-op if exists) |
-| `save_message(session_id, role, content, ...)` | Log a message to conversations |
-| `load_session_messages(session_id)` | Reconstruct OpenAI message format from DB rows |
-| `list_sessions(limit)` | List sessions with >=1 message, ordered by updated DESC |
-| `delete_session(session_id)` | Delete session and all its messages |
-| `prune_sessions(retention_days)` | Remove empty sessions and old unnamed sessions |
-| `resolve_session(alias_or_id)` | Resolve alias, exact id, or id prefix to full session_id |
-| `save_session_config(session_id, config)` | Persist session configuration key/value pairs |
-| `load_session_config(session_id)` | Retrieve session configuration |
-| `set_session_alias(session_id, alias)` | Set user-friendly alias (returns False if taken) |
-| `get_session_name(session_id)` | Return alias if set, else title, else None |
-| `update_session_title(session_id, title)` | Set/update LLM-generated title |
 | `register_workstream(ws_id, node_id, name, state)` | Create a workstreams row (no-op if exists) |
+| `save_message(ws_id, role, content, ...)` | Log a message to conversations |
+| `load_messages(ws_id)` | Reconstruct OpenAI message format from DB rows |
+| `list_workstreams_with_history(limit)` | List workstreams with >=1 message, ordered by updated DESC |
+| `delete_workstream(ws_id)` | Delete workstream and cascade conversations + config |
+| `prune_workstreams(retention_days)` | Remove empty workstreams and old unnamed workstreams |
+| `resolve_workstream(alias_or_id)` | Resolve alias, exact id, or id prefix to full ws_id |
+| `save_workstream_config(ws_id, config)` | Persist workstream configuration key/value pairs |
+| `load_workstream_config(ws_id)` | Retrieve workstream configuration |
+| `set_workstream_alias(ws_id, alias)` | Set user-friendly alias (returns False if taken) |
+| `get_workstream_display_name(ws_id)` | Return alias if set, else title, else None |
+| `update_workstream_title(ws_id, title)` | Set/update LLM-generated title |
 | `update_workstream_state(ws_id, state)` | Update workstream state and bump timestamp |
 | `update_workstream_name(ws_id, name)` | Update workstream display name |
-| `delete_workstream(ws_id)` | Delete a workstream row |
 | `list_workstreams(node_id, limit)` | List workstreams, optionally by node |
 | `kv_get(key)` / `kv_set(key, value)` / `kv_delete(key)` | Generic key-value store (backs memories table) |
 | `kv_list()` / `kv_search(query)` | List or search key-value pairs |
@@ -757,59 +758,59 @@ pool_size = 5                       # PostgreSQL connection pool size

 Environment variables: `TURNSTONE_DB_BACKEND`, `TURNSTONE_DB_URL`, `TURNSTONE_DB_PATH`.

-### Session Persistence and Resume
+### Persistence and Resume

-Each `ChatSession` generates a full 32-char hex UUID `_session_id` on creation
-and registers it in the `sessions` table with the server's `node_id` and the
-owning `ws_id`. Messages are saved to `conversations` as they happen via
-`save_message()`. Workstreams are persisted to the `workstreams` table on
-creation, with state changes tracked via `update_workstream_state()`.
+`ws_id` is the sole persistent identity for both routing and conversation
+history. There is no separate `session_id` — the `workstreams` table holds
+alias, title, and state alongside the routing fields (`node_id`, `name`).
+Messages are saved to `conversations` (keyed by `ws_id`) as they happen
+via `save_message()`. Workstream state changes are tracked via
+`update_workstream_state()`.

 **Auto-titling:** After the first complete exchange (user message + assistant
 response), a background thread calls the LLM with a title-generation prompt
 (`reasoning_effort: "low"`, `max_completion_tokens: 200`). The generated
-title (3-8 words) is stored in `sessions.title`.
+title (3-8 words) is stored in `workstreams.title`.

-**Resume flow:** `ChatSession.resume_session(session_id)` calls
-`load_session_messages()` which reconstructs the OpenAI message format from
-database rows:
+**Resume flow:** `ChatSession.resume(ws_id)` calls `load_messages()` which
+reconstructs the OpenAI message format from database rows:

 - `user` and `assistant` rows map directly
 - Consecutive `tool_call` rows are grouped into one assistant message's
  `tool_calls` array, paired with subsequent `tool_result` rows via
  `tool_call_id` (or positional matching for legacy data)
- **Interrupted session repair:** If the last assistant message has
-  `tool_calls` but fewer tool results than expected (session was
+- **Interrupted conversation repair:** If the last assistant message has
+  `tool_calls` but fewer tool results than expected (conversation was
  interrupted mid-execution), the incomplete turn is stripped so the
  LLM can re-generate cleanly
- The session adopts the old `_session_id`, so new messages continue in
-  the same session
+- The `ChatSession` adopts the resumed `_ws_id`, so new messages continue
+  in the same workstream

 **Config persistence:** LLM-affecting parameters (`temperature`,
 `reasoning_effort`, `max_tokens`, `instructions`, `creative_mode`) are
-persisted to the `session_config` table on creation and whenever changed
-via slash commands. `resume_session()` restores these values so resumed
-sessions behave identically to the original.
+persisted to the `workstream_config` table on creation and whenever changed
+via slash commands. `resume()` restores these values so resumed workstreams
+behave identically to the original.

 **`/clear` vs `/new`:** `/clear` wipes in-memory context but preserves
-messages in the database for future resume. `/new` starts a fresh session
-(new `_session_id`), leaving the old session resumable.
+messages in the database for future resume. `/new` starts a fresh workstream
+(new `_ws_id`), leaving the old workstream resumable.

-**Resolution:** `resolve_session()` accepts aliases, exact session IDs, or
-session ID prefixes, enabling `turnstone --resume refactor` or `/resume abc12`.
+**Resolution:** `resolve_workstream()` accepts aliases, exact workstream IDs,
+or ID prefixes, enabling `turnstone --resume refactor` or `/resume abc12`.

-**Session listing:** `list_sessions()` only returns sessions that have at
-least one saved message (`WHERE EXISTS` on `conversations`). Sessions
-registered but never used (e.g., from process startup) are invisible until
-a message is sent.
+**Workstream listing:** `list_workstreams_with_history()` only returns
+workstreams that have at least one saved message (`WHERE EXISTS` on
+`conversations`). Workstreams registered but never used (e.g., from process
+startup) are invisible until a message is sent.

-**Session pruning:** `prune_sessions(retention_days, log_fn)` runs once at
-startup (CLI and server). It removes:
- Sessions with no messages (orphaned registrations)
- Unnamed sessions (`alias IS NULL`) older than `retention_days` days (default 90)
+**Workstream pruning:** `prune_workstreams(retention_days, log_fn)` runs once
+at startup (CLI and server). It removes:
+- Workstreams with no messages (orphaned registrations)
+- Unnamed workstreams (`alias IS NULL`) older than `retention_days` days (default 90)

-Named (aliased) sessions are never age-pruned. Configure with
-`--session-retention-days N` (0 = disable age pruning).
+Named (aliased) workstreams are never age-pruned. Configure with
+`--retention-days N` (0 = disable age pruning).

 ---

@@ -947,7 +948,7 @@ Three hierarchical scopes control endpoint access:

 | Scope | Grants | Endpoints |
 |-------|--------|-----------|
-| `read` | SSE streams, workstream listing, sessions | GET endpoints |
+| `read` | SSE streams, workstream listing, history | GET endpoints |
 | `write` | `read` + send, command, workstream create/close | POST to `/api/send`, `/api/command`, etc. |
 | `approve` | `write` + tool approval, admin operations | POST to `/api/approve`, `/api/admin/*` |

@@ -1239,7 +1240,7 @@ typed event dataclasses.

 **Two client pairs** (sync + async):

- `TurnstoneServer` / `AsyncTurnstoneServer` — server API (workstreams, chat, streaming, sessions)
+- `TurnstoneServer` / `AsyncTurnstoneServer` — server API (workstreams, chat, streaming)
 - `TurnstoneConsole` / `AsyncTurnstoneConsole` — console API (cluster overview, nodes, workstreams)

 **Design**: async-first with thin sync wrappers. `_BaseClient` provides httpx
@@ -1279,11 +1280,11 @@ The `ChannelRouter` manages bidirectional routing: it maps platform
 channel/thread IDs to turnstone workstream IDs, handles workstream
 creation and stale-route recovery, and resolves platform users to
 turnstone identities via the `channel_users` table. When an evicted
-workstream is reactivated, the router uses atomic session resume via the
-`resume_session` field on `CreateWorkstreamMessage` — the server resumes
-the old session during workstream creation in a single HTTP request,
-eliminating ordering fragility. The bridge emits a `SessionResumedEvent`
-to confirm success.
+workstream is reactivated, the router uses atomic resume via the
+`resume_ws` field on `CreateWorkstreamMessage` — the server resumes
+the old workstream's conversation during creation in a single HTTP
+request, eliminating ordering fragility. The bridge emits a
+`WorkstreamResumedEvent` to confirm success.

 Discord ships as the first adapter. See [channels.md](channels.md) for
 setup instructions, configuration reference, and the adapter development
@@ -136,11 +136,11 @@ An admin can also force-link or unlink users via the console admin panel
  1.5 seconds.
 - If the workstream is evicted for capacity, the next message in the
  thread auto-creates a new workstream and atomically resumes the
-  previous session via the `resume_session` field on
-  `CreateWorkstreamMessage`. The server resumes the session during
-  workstream creation (same HTTP request), and the bridge emits a
-  `SessionResumedEvent` back to the channel. The thread receives a
-  *"Session resumed: {name} ({count} messages restored)"* confirmation.
+  previous workstream via the `resume_ws` field on
+  `CreateWorkstreamMessage`. The server resumes the workstream during
+  creation (same HTTP request), and the bridge emits a
+  `WorkstreamResumedEvent` back to the channel. The thread receives a
+  *"Resumed: {name} ({count} messages restored)"* confirmation.

 ### Slash Commands

@@ -232,14 +232,12 @@ See [Security: Database Schema](security.md#database-schema) for the
 3. **Eviction** — the server evicts an idle workstream for capacity. The
   route is preserved and the thread stays open.
 4. **Reactivation** — the next message in the thread detects the stale
-   route (no MQ owner), looks up the old session via
-   `get_session_id_by_ws()`, and creates a new workstream with
-   `resume_session` set atomically on the `CreateWorkstreamMessage`. The
-   server resumes the session during creation (no separate command
-   needed). The bridge emits a `SessionResumedEvent` to the channel, and
-   the thread displays *"Session resumed: {name} ({count} messages
-   restored)"*. If the old session was pruned, the workstream starts
-   fresh with no error.
+   route (no MQ owner) and creates a new workstream with the old `ws_id`
+   as `resume_ws` on the `CreateWorkstreamMessage`. The server resumes
+   the workstream during creation (no separate command or reverse lookup
+   needed). The bridge emits a `WorkstreamResumedEvent` to the channel, and
+   the thread displays *"Resumed: {name} ({count} messages restored)"*.
+   If the old workstream was pruned, a fresh one starts with no error.
 5. **Close** — `/close` command closes the workstream via MQ, deletes the
   route, unsubscribes from events, and archives the Discord thread.

@@ -118,7 +118,7 @@ class "ChatSession" as ChatSession {
    - ui: SessionUI
    - messages: list[dict]
    - _msg_tokens: list[int]
-    - _session_id: str
+    - _ws_id: str
    - _mcp_client: MCPClientManager | None
    - _registry: ModelRegistry | None
    + model_alias: str | None {property}
@@ -130,7 +130,7 @@ class "ChatSession" as ChatSession {
    --
    + send(user_input: str)
    + handle_command(command: str)
-    + resume_session(session_id: str)
+    + resume(ws_id: str)
    - _save_config()
    - _stream_response(stream) → dict
    - _create_stream_with_retry(msgs) → Stream (+ fallback)
@@ -18,7 +18,7 @@ User -> CS : send(user_input)
 activate CS

 CS -> CS : messages.append({role: "user", content: input})
-CS -> DB : save_message(session_id, "user", input)
+CS -> DB : save_message(ws_id, "user", input)

 == LLM Call Loop ==

@@ -65,8 +65,8 @@ group loop [while tool_calls present]

    CS -> CS : _update_token_table()\ncalibrate chars_per_token ratio
    CS -> CS : messages.append(assistant_msg)
-    CS -> DB : save_message(session_id, "assistant", content)
-    CS -> DB : save_message(session_id, "tool_call", ...) ×N
+    CS -> DB : save_message(ws_id, "assistant", content)
+    CS -> DB : save_message(ws_id, "tool_call", ...) ×N

    == Tool Dispatch (if tool_calls) ==

@@ -136,7 +136,7 @@ group loop [while tool_calls present]

        loop for each result
            CS -> CS : messages.append({role: "tool", ...})
-            CS -> DB : save_message(session_id, "tool_result", ...)
+            CS -> DB : save_message(ws_id, "tool_result", ...)
        end

        opt user_feedback from approval
@@ -35,7 +35,7 @@ package "turnstone/sdk/ (Python)" {
        + stream_events(ws_id)
        + stream_global_events()
        + send_and_wait()
-        + list_sessions()
+        + list_saved_workstreams()
        + login() / logout()
        + health()
    }
@@ -13,23 +13,19 @@ skinparam class {

 ' -- Protocol --
 interface "StorageBackend" as SB <<protocol>> {
-    +register_session(session_id, title, node_id, ws_id)
-    +save_message(session_id, role, content, ...)
-    +load_session_messages(session_id) → list[dict]
-    +list_sessions(limit) → list
-    +delete_session(session_id) → bool
-    +prune_sessions(retention_days) → (int, int)
-    +resolve_session(alias_or_id) → str | None
-    +save_session_config(session_id, config)
-    +load_session_config(session_id) → dict
-    +set_session_alias(session_id, alias) → bool
-    +get_session_name(session_id) → str | None
-    +update_session_title(session_id, title)
+    +save_message(ws_id, role, content, ...)
+    +load_messages(ws_id) → list[dict]
    +register_workstream(ws_id, node_id, name, state)
    +update_workstream_state(ws_id, state)
    +update_workstream_name(ws_id, name)
+    +set_workstream_alias(ws_id, alias) → bool
+    +update_workstream_title(ws_id, title)
+    +resolve_workstream(alias_or_id) → str | None
    +delete_workstream(ws_id) → bool
+    +prune_workstreams(retention_days) → (int, int)
    +list_workstreams(node_id, limit) → list
+    +save_workstream_config(ws_id, config)
+    +load_workstream_config(ws_id) → dict
    +kv_get(key) → str | None
    +kv_set(key, value) → str | None
    +kv_delete(key) → bool
@@ -68,9 +64,8 @@ class "_schema.py" as Schema <<schema>> {
    +metadata: MetaData
    +memories: Table
    +conversations: Table
-    +sessions: Table (node_id, ws_id, user_id)
-    +workstreams: Table (node_id, user_id, state)
-    +session_config: Table
+    +workstreams: Table (node_id, alias, title, state)
+    +workstream_config: Table
    +users: Table (username, password_hash)
    +api_tokens: Table (token_hash, scopes)
    +channel_users: Table (channel_type)
@@ -106,14 +101,14 @@ class "_registry.py" as Registry {

 ' -- Facade --
 class "memory.py" as Facade <<facade>> {
-    +register_session()
    +save_message()
-    +load_session_messages()
+    +load_messages()
    +register_workstream()
    +update_workstream_state()
+    +save_workstream_config()
    +save_memory() / delete_memory()
    +search_memories()
-    +... (all 22 functions)
+    +... (all delegated functions)
    --
    Thin delegation to
    get_storage()
@@ -195,13 +195,13 @@ note right of Bot
  5. Broker.push_inbound(SendMessage)
  6. Bridge pops from Redis, drives server

-  **Session Resume (evicted workstreams)**
+  **Workstream Resume (evicted workstreams)**
  1. Stale route detected (no MQ owner)
-  2. Old session looked up via get_session_id_by_ws()
+  2. Existing ws_id reused directly from route
  3. CreateWorkstreamMessage sent with
-     resume_session=<old_session_id>
+     resume_ws=<ws_id>
  4. Server resumes atomically during creation
-  5. Bridge emits SessionResumedEvent → thread
+  5. Bridge emits WorkstreamResumedEvent → thread
 end note

 note right of Broker
@@ -0,0 +1,286 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 540" font-family="-apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif">
+  <defs>
+    <!-- Arrowhead markers -->
+    <marker id="arrow" viewBox="0 0 10 7" refX="10" refY="3.5" markerWidth="8" markerHeight="6" orient="auto-start-auto">
+      <path d="M 0 0 L 10 3.5 L 0 7 z" fill="#484f58"/>
+    </marker>
+    <marker id="arrow-blue" viewBox="0 0 10 7" refX="10" refY="3.5" markerWidth="8" markerHeight="6" orient="auto-start-auto">
+      <path d="M 0 0 L 10 3.5 L 0 7 z" fill="#58a6ff"/>
+    </marker>
+    <marker id="arrow-green" viewBox="0 0 10 7" refX="10" refY="3.5" markerWidth="8" markerHeight="6" orient="auto-start-auto">
+      <path d="M 0 0 L 10 3.5 L 0 7 z" fill="#3fb950"/>
+    </marker>
+    <marker id="arrow-orange" viewBox="0 0 10 7" refX="10" refY="3.5" markerWidth="8" markerHeight="6" orient="auto-start-auto">
+      <path d="M 0 0 L 10 3.5 L 0 7 z" fill="#f0883e"/>
+    </marker>
+    <marker id="arrow-coral" viewBox="0 0 10 7" refX="10" refY="3.5" markerWidth="8" markerHeight="6" orient="auto-start-auto">
+      <path d="M 0 0 L 10 3.5 L 0 7 z" fill="#f47067"/>
+    </marker>
+    <marker id="arrow-muted" viewBox="0 0 10 7" refX="10" refY="3.5" markerWidth="8" markerHeight="6" orient="auto-start-auto">
+      <path d="M 0 0 L 10 3.5 L 0 7 z" fill="#8b949e"/>
+    </marker>
+
+    <!-- Card shadow filter -->
+    <filter id="shadow" x="-4%" y="-4%" width="108%" height="112%">
+      <feDropShadow dx="0" dy="1" stdDeviation="2" flood-color="#000" flood-opacity="0.4"/>
+    </filter>
+  </defs>
+
+  <!-- Background -->
+  <rect width="1200" height="540" rx="8" fill="#0d1117"/>
+
+  <!-- Title -->
+  <text x="600" y="36" text-anchor="middle" fill="#e6edf3" font-size="15" font-weight="700" letter-spacing="3">TURNSTONE</text>
+  <text x="600" y="54" text-anchor="middle" fill="#8b949e" font-size="11" letter-spacing="1">SYSTEM ARCHITECTURE</text>
+
+  <!-- ==================== COLUMN HEADERS ==================== -->
+  <text x="90" y="86" text-anchor="middle" fill="#58a6ff" font-size="9" font-weight="600" letter-spacing="2">CLIENTS</text>
+  <text x="276" y="86" text-anchor="middle" fill="#3fb950" font-size="9" font-weight="600" letter-spacing="2">GATEWAYS</text>
+  <text x="480" y="86" text-anchor="middle" fill="#f0883e" font-size="9" font-weight="600" letter-spacing="2">MESSAGE QUEUE</text>
+  <text x="700" y="86" text-anchor="middle" fill="#f47067" font-size="9" font-weight="600" letter-spacing="2">CLUSTER NODES</text>
+  <text x="940" y="86" text-anchor="middle" fill="#f778ba" font-size="9" font-weight="600" letter-spacing="2">LLM PROVIDERS</text>
+
+  <!-- ==================== CLIENT BOXES ==================== -->
+  <!-- CLI -->
+  <g filter="url(#shadow)">
+    <rect x="30" y="108" width="120" height="46" rx="5" fill="#161b22" stroke="#30363d" stroke-width="1"/>
+    <rect x="30" y="108" width="120" height="5" rx="5" fill="#58a6ff"/>
+    <rect x="30" y="108" width="120" height="5" fill="#58a6ff"/>
+    <rect x="30" y="111" width="120" height="2" fill="#161b22"/>
+    <text x="90" y="130" text-anchor="middle" fill="#e6edf3" font-size="11" font-weight="600">CLI</text>
+    <text x="90" y="145" text-anchor="middle" fill="#8b949e" font-size="9">terminal REPL</text>
+  </g>
+
+  <!-- Browser UI -->
+  <g filter="url(#shadow)">
+    <rect x="30" y="174" width="120" height="46" rx="5" fill="#161b22" stroke="#30363d" stroke-width="1"/>
+    <rect x="30" y="174" width="120" height="5" rx="5" fill="#58a6ff"/>
+    <rect x="30" y="174" width="120" height="5" fill="#58a6ff"/>
+    <rect x="30" y="177" width="120" height="2" fill="#161b22"/>
+    <text x="90" y="196" text-anchor="middle" fill="#e6edf3" font-size="11" font-weight="600">Browser UI</text>
+    <text x="90" y="211" text-anchor="middle" fill="#8b949e" font-size="9">HTTP + SSE</text>
+  </g>
+
+  <!-- SDK / API -->
+  <g filter="url(#shadow)">
+    <rect x="30" y="244" width="120" height="46" rx="5" fill="#161b22" stroke="#30363d" stroke-width="1"/>
+    <rect x="30" y="244" width="120" height="5" rx="5" fill="#58a6ff"/>
+    <rect x="30" y="244" width="120" height="5" fill="#58a6ff"/>
+    <rect x="30" y="247" width="120" height="2" fill="#161b22"/>
+    <text x="90" y="266" text-anchor="middle" fill="#e6edf3" font-size="11" font-weight="600">SDK / API</text>
+    <text x="90" y="281" text-anchor="middle" fill="#8b949e" font-size="9">programmatic</text>
+  </g>
+
+  <!-- Discord / Slack -->
+  <g filter="url(#shadow)">
+    <rect x="30" y="314" width="120" height="46" rx="5" fill="#161b22" stroke="#30363d" stroke-width="1"/>
+    <rect x="30" y="314" width="120" height="5" rx="5" fill="#58a6ff"/>
+    <rect x="30" y="314" width="120" height="5" fill="#58a6ff"/>
+    <rect x="30" y="317" width="120" height="2" fill="#161b22"/>
+    <text x="90" y="336" text-anchor="middle" fill="#e6edf3" font-size="11" font-weight="600">Discord / Slack</text>
+    <text x="90" y="351" text-anchor="middle" fill="#8b949e" font-size="9">chat platforms</text>
+  </g>
+
+  <!-- ==================== GATEWAY BOXES ==================== -->
+  <!-- Console -->
+  <g filter="url(#shadow)">
+    <rect x="216" y="118" width="120" height="58" rx="5" fill="#161b22" stroke="#30363d" stroke-width="1"/>
+    <rect x="216" y="118" width="120" height="5" rx="5" fill="#3fb950"/>
+    <rect x="216" y="118" width="120" height="5" fill="#3fb950"/>
+    <rect x="216" y="121" width="120" height="2" fill="#161b22"/>
+    <text x="276" y="142" text-anchor="middle" fill="#e6edf3" font-size="11" font-weight="600">Console</text>
+    <text x="276" y="157" text-anchor="middle" fill="#8b949e" font-size="9">dashboard + proxy</text>
+    <text x="276" y="169" text-anchor="middle" fill="#8b949e" font-size="9">cluster management</text>
+  </g>
+
+  <!-- Channel Gateway -->
+  <g filter="url(#shadow)">
+    <rect x="216" y="292" width="120" height="58" rx="5" fill="#161b22" stroke="#30363d" stroke-width="1"/>
+    <rect x="216" y="292" width="120" height="5" rx="5" fill="#3fb950"/>
+    <rect x="216" y="292" width="120" height="5" fill="#3fb950"/>
+    <rect x="216" y="295" width="120" height="2" fill="#161b22"/>
+    <text x="276" y="316" text-anchor="middle" fill="#e6edf3" font-size="11" font-weight="600">Channel Gateway</text>
+    <text x="276" y="331" text-anchor="middle" fill="#8b949e" font-size="9">platform adapter</text>
+    <text x="276" y="343" text-anchor="middle" fill="#8b949e" font-size="9">Discord, Slack, ...</text>
+  </g>
+
+  <!-- ==================== REDIS MQ ==================== -->
+  <g filter="url(#shadow)">
+    <rect x="420" y="168" width="120" height="132" rx="5" fill="#161b22" stroke="#30363d" stroke-width="1"/>
+    <rect x="420" y="168" width="120" height="5" rx="5" fill="#f0883e"/>
+    <rect x="420" y="168" width="120" height="5" fill="#f0883e"/>
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+    <text x="480" y="198" text-anchor="middle" fill="#e6edf3" font-size="11" font-weight="600">Redis MQ</text>
+    <line x1="438" y1="210" x2="522" y2="210" stroke="#30363d" stroke-width="1"/>
+    <text x="480" y="228" text-anchor="middle" fill="#8b949e" font-size="9">inbound queues</text>
+    <text x="480" y="243" text-anchor="middle" fill="#8b949e" font-size="9">event pub/sub</text>
+    <text x="480" y="258" text-anchor="middle" fill="#8b949e" font-size="9">node heartbeats</text>
+    <text x="480" y="273" text-anchor="middle" fill="#8b949e" font-size="9">workstream routing</text>
+    <text x="480" y="288" text-anchor="middle" fill="#8b949e" font-size="9">cluster state</text>
+  </g>
+
+  <!-- ==================== CLUSTER NODES ==================== -->
+  <!-- Cluster outline -->
+  <rect x="598" y="100" width="204" height="310" rx="8" fill="none" stroke="#30363d" stroke-width="1" stroke-dasharray="4,3"/>
+  <text x="700" y="422" text-anchor="middle" fill="#30363d" font-size="9" letter-spacing="1">CLUSTER</text>
+
+  <!-- Node A -->
+  <g filter="url(#shadow)">
+    <rect x="614" y="118" width="170" height="100" rx="5" fill="#161b22" stroke="#30363d" stroke-width="1"/>
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+    <!-- Bridge -->
+    <rect x="626" y="162" width="70" height="28" rx="3" fill="#1c2128" stroke="#30363d" stroke-width="1"/>
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+    <text x="739" y="180" text-anchor="middle" fill="#8b949e" font-size="9">server</text>
+    <!-- Arrow bridge to server -->
+    <line x1="696" y1="176" x2="702" y2="176" stroke="#484f58" stroke-width="1" marker-end="url(#arrow)"/>
+    <!-- Tools label -->
+    <text x="699" y="206" text-anchor="middle" fill="#484f58" font-size="8">14 tools + MCP</text>
+  </g>
+
+  <!-- Node B -->
+  <g filter="url(#shadow)">
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+    <!-- Bridge -->
+    <rect x="626" y="282" width="70" height="28" rx="3" fill="#1c2128" stroke="#30363d" stroke-width="1"/>
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+    <!-- Server -->
+    <rect x="704" y="282" width="70" height="28" rx="3" fill="#1c2128" stroke="#30363d" stroke-width="1"/>
+    <text x="739" y="300" text-anchor="middle" fill="#8b949e" font-size="9">server</text>
+    <!-- Arrow bridge to server -->
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+    <!-- Tools label -->
+    <text x="699" y="326" text-anchor="middle" fill="#484f58" font-size="8">14 tools + MCP</text>
+  </g>
+
+  <!-- ==================== LLM PROVIDERS ==================== -->
+  <!-- OpenAI -->
+  <g filter="url(#shadow)">
+    <rect x="870" y="130" width="140" height="46" rx="5" fill="#161b22" stroke="#30363d" stroke-width="1"/>
+    <rect x="870" y="130" width="140" height="5" rx="5" fill="#f778ba"/>
+    <rect x="870" y="130" width="140" height="5" fill="#f778ba"/>
+    <rect x="870" y="133" width="140" height="2" fill="#161b22"/>
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+    <text x="940" y="167" text-anchor="middle" fill="#8b949e" font-size="9">GPT-5, o-series</text>
+  </g>
+
+  <!-- Anthropic -->
+  <g filter="url(#shadow)">
+    <rect x="870" y="196" width="140" height="46" rx="5" fill="#161b22" stroke="#30363d" stroke-width="1"/>
+    <rect x="870" y="196" width="140" height="5" rx="5" fill="#f778ba"/>
+    <rect x="870" y="196" width="140" height="5" fill="#f778ba"/>
+    <rect x="870" y="199" width="140" height="2" fill="#161b22"/>
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+    <text x="940" y="233" text-anchor="middle" fill="#8b949e" font-size="9">Claude 4.5 / 4.6</text>
+  </g>
+
+  <!-- Local / vLLM -->
+  <g filter="url(#shadow)">
+    <rect x="870" y="262" width="140" height="46" rx="5" fill="#161b22" stroke="#30363d" stroke-width="1"/>
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+    <text x="940" y="285" text-anchor="middle" fill="#e6edf3" font-size="11" font-weight="600">Local / vLLM</text>
+    <text x="940" y="299" text-anchor="middle" fill="#8b949e" font-size="9">llama.cpp, NIM</text>
+  </g>
+
+  <!-- ==================== STORAGE ==================== -->
+  <g filter="url(#shadow)">
+    <rect x="614" y="450" width="170" height="52" rx="5" fill="#161b22" stroke="#30363d" stroke-width="1"/>
+    <rect x="614" y="450" width="170" height="5" rx="5" fill="#bc8cff"/>
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+    <rect x="614" y="453" width="170" height="2" fill="#161b22"/>
+    <text x="699" y="476" text-anchor="middle" fill="#e6edf3" font-size="11" font-weight="600">PostgreSQL / SQLite</text>
+    <text x="699" y="492" text-anchor="middle" fill="#8b949e" font-size="9">conversations, memory, auth</text>
+  </g>
+  <text x="699" y="444" text-anchor="middle" fill="#bc8cff" font-size="9" font-weight="600" letter-spacing="2">STORAGE</text>
+
+  <!-- ==================== CONNECTION LINES ==================== -->
+
+  <!-- CLIENT -> GATEWAY connections -->
+  <!-- Browser -> Console -->
+  <line x1="150" y1="197" x2="214" y2="155" stroke="#58a6ff" stroke-width="1.2" stroke-opacity="0.6" marker-end="url(#arrow-blue)"/>
+  <!-- Discord -> Channel -->
+  <line x1="150" y1="337" x2="214" y2="325" stroke="#58a6ff" stroke-width="1.2" stroke-opacity="0.6" marker-end="url(#arrow-blue)"/>
+
+  <!-- CLI -> direct to Node A server (top path, curved) -->
+  <path d="M 150 131 C 200 131, 200 100, 400 100 L 400 100 C 500 100, 570 140, 612 168" stroke="#58a6ff" stroke-width="1.2" stroke-opacity="0.5" fill="none" stroke-dasharray="6,3" marker-end="url(#arrow-blue)"/>
+  <text x="370" y="96" fill="#484f58" font-size="8" text-anchor="middle">direct</text>
+
+  <!-- SDK -> Redis (direct push) -->
+  <line x1="150" y1="267" x2="418" y2="240" stroke="#58a6ff" stroke-width="1.2" stroke-opacity="0.6" marker-end="url(#arrow-blue)"/>
+
+  <!-- GATEWAY -> REDIS connections -->
+  <!-- Console -> Redis -->
+  <line x1="336" y1="160" x2="418" y2="200" stroke="#3fb950" stroke-width="1.2" stroke-opacity="0.6" marker-end="url(#arrow-green)"/>
+  <!-- Channel -> Redis -->
+  <line x1="336" y1="318" x2="418" y2="272" stroke="#3fb950" stroke-width="1.2" stroke-opacity="0.6" marker-end="url(#arrow-green)"/>
+
+  <!-- REDIS -> NODE connections -->
+  <!-- Redis -> Node A bridge -->
+  <line x1="540" y1="210" x2="624" y2="176" stroke="#f0883e" stroke-width="1.2" stroke-opacity="0.6" marker-end="url(#arrow-orange)"/>
+  <!-- Redis -> Node B bridge -->
+  <line x1="540" y1="260" x2="624" y2="296" stroke="#f0883e" stroke-width="1.2" stroke-opacity="0.6" marker-end="url(#arrow-orange)"/>
+
+  <!-- Console -> Node (proxy, dashed) -->
+  <path d="M 336 147 C 380 130, 500 108, 612 145" stroke="#3fb950" stroke-width="1" stroke-opacity="0.4" fill="none" stroke-dasharray="4,3" marker-end="url(#arrow-green)"/>
+  <text x="468" y="120" fill="#484f58" font-size="8" text-anchor="middle">proxy</text>
+
+  <!-- NODE -> LLM connections -->
+  <!-- Node A -> LLM providers -->
+  <line x1="784" y1="168" x2="868" y2="155" stroke="#f47067" stroke-width="1.2" stroke-opacity="0.5" marker-end="url(#arrow-coral)"/>
+  <line x1="784" y1="176" x2="868" y2="219" stroke="#f47067" stroke-width="1.2" stroke-opacity="0.3"/>
+  <line x1="784" y1="180" x2="868" y2="282" stroke="#f47067" stroke-width="1.2" stroke-opacity="0.2"/>
+
+  <!-- Node B -> LLM providers -->
+  <line x1="784" y1="288" x2="868" y2="163" stroke="#f47067" stroke-width="1.2" stroke-opacity="0.2"/>
+  <line x1="784" y1="296" x2="868" y2="222" stroke="#f47067" stroke-width="1.2" stroke-opacity="0.3"/>
+  <line x1="784" y1="300" x2="868" y2="288" stroke="#f47067" stroke-width="1.2" stroke-opacity="0.5" marker-end="url(#arrow-coral)"/>
+
+  <!-- NODE -> STORAGE connections -->
+  <line x1="680" y1="338" x2="680" y2="448" stroke="#bc8cff" stroke-width="1.2" stroke-opacity="0.4" stroke-dasharray="4,3" marker-end="url(#arrow-muted)"/>
+  <line x1="718" y1="218" x2="718" y2="236" stroke="#484f58" stroke-width="1" stroke-opacity="0.3" stroke-dasharray="2,2"/>
+
+  <!-- Extensibility hint -->
+  <text x="699" y="392" text-anchor="middle" fill="#30363d" font-size="10">...</text>
+
+  <!-- Event flow: Bridges -> Redis (dashed, bidirectional feel) -->
+  <line x1="624" y1="186" x2="542" y2="220" stroke="#f0883e" stroke-width="1" stroke-opacity="0.3" stroke-dasharray="3,3"/>
+  <line x1="624" y1="286" x2="542" y2="250" stroke="#f0883e" stroke-width="1" stroke-opacity="0.3" stroke-dasharray="3,3"/>
+  <text x="574" y="242" fill="#484f58" font-size="7" text-anchor="middle">events</text>
+
+  <!-- ==================== FLOW LABELS ==================== -->
+  <!-- Interactive flow label -->
+  <rect x="30" y="395" width="10" height="10" rx="2" fill="none" stroke="#58a6ff" stroke-width="1.5" stroke-dasharray="3,2"/>
+  <text x="46" y="404" fill="#8b949e" font-size="9">interactive (direct)</text>
+
+  <!-- Queue flow label -->
+  <rect x="160" y="395" width="10" height="10" rx="2" fill="none" stroke="#f0883e" stroke-width="1.5"/>
+  <text x="176" y="404" fill="#8b949e" font-size="9">queue-driven</text>
+
+  <!-- Proxy/event label -->
+  <rect x="275" y="395" width="10" height="10" rx="2" fill="none" stroke="#3fb950" stroke-width="1.5" stroke-dasharray="3,2"/>
+  <text x="291" y="404" fill="#8b949e" font-size="9">proxy / events</text>
+
+  <!-- ==================== BOTTOM DETAILS ==================== -->
+  <line x1="30" y1="430" x2="1170" y2="430" stroke="#21262d" stroke-width="1"/>
+
+  <!-- Routing rules at bottom, left-aligned -->
+  <text x="44" y="456" fill="#30363d" font-size="9" font-weight="600" letter-spacing="1">ROUTING</text>
+  <circle cx="44" cy="474" r="3" fill="#f47067" opacity="0.6"/>
+  <text x="54" y="477" fill="#484f58" font-size="9">target_node set  &#x2192;  route to specific node queue</text>
+  <circle cx="44" cy="494" r="3" fill="#f0883e" opacity="0.6"/>
+  <text x="54" y="497" fill="#484f58" font-size="9">ws_id set  &#x2192;  route to owning node</text>
+  <circle cx="44" cy="514" r="3" fill="#58a6ff" opacity="0.6"/>
+  <text x="54" y="517" fill="#484f58" font-size="9">neither  &#x2192;  shared queue, any node picks up</text></svg>
@@ -28,6 +28,8 @@ Console dashboard: http://localhost:8090
 | `bridge` | — | default | Redis-to-HTTP bridge (multi-node routing) |
 | `console` | 8090 | default | Cluster dashboard |
 | `channel` | — | production | Channel gateway (Discord, Slack, etc.) |
+| `server-1`…`server-10` | — | cluster | 10-node server fleet (PostgreSQL required) |
+| `bridge-1`…`bridge-10` | — | cluster | Matching bridge fleet |
 | `sim` | — | sim | Multi-node cluster simulator |

 ## Profiles
@@ -44,6 +46,12 @@ docker compose up
 docker compose --profile production up
 ```

+**Cluster** — 10-node server/bridge fleet sharing PostgreSQL and Redis. Access all nodes via the console at `:8090`. Requires `POSTGRES_PASSWORD`:
+
+```bash
+docker compose --profile cluster up
+```
+
 **Sim** — adds the simulator. Can run alongside the full stack or standalone with just Redis and the console:

 ```bash
@@ -135,13 +143,13 @@ The channel service runs in the `production` profile. When `TURNSTONE_DISCORD_TO

 ## Scaling

-Scale to multiple server/bridge pairs:
+For multi-node testing, use the `cluster` profile which provides 10 dedicated server+bridge pairs with unique node IDs (`node-1` through `node-10`), resource limits, and shared PostgreSQL:

 ```bash
-docker compose up --scale server=3 --scale bridge=3
+POSTGRES_PASSWORD=secret docker compose --profile cluster up
 ```

-Each bridge auto-generates a unique node ID from its container hostname. When scaling `server`, remove the host port mapping (or use a reverse proxy) to avoid port conflicts.
+The default `server` and `bridge` also run alongside the cluster nodes (11 total). All nodes are accessible via the console dashboard at `:8090`.

 ## Volumes

@@ -78,7 +78,7 @@ Both `TurnstoneServer` (sync) and `AsyncTurnstoneServer` (async) expose:
 | **Streaming** | `stream_events(ws_id)` | `Iterator[ServerEvent]` |
 | | `stream_global_events()` | `Iterator[ServerEvent]` |
 | **High-level** | `send_and_wait(message, ws_id, *, timeout, on_event)` | `TurnResult` |
-| **Sessions** | `list_sessions()` | `ListSessionsResponse` |
+| **Saved** | `list_saved_workstreams()` | `ListSavedWorkstreamsResponse` |
 | **Auth** | `login(username=..., password=...)` | `AuthLoginResponse` |
 | | `login(token="ts_xxx")` | `AuthLoginResponse` |
 | | `logout()` | `StatusResponse` |
@@ -73,7 +73,7 @@ Scopes are hierarchical — higher scopes imply all lower ones.

 | Scope | Grants | Implies |
 |-------|--------|---------|
-| `read` | View workstreams, sessions, history | — |
+| `read` | View workstreams, saved workstreams, history | — |
 | `write` | Send messages, create/close workstreams | `read` |
 | `approve` | Approve tool calls, admin endpoints | `read`, `write` |

@@ -337,7 +337,7 @@ Plan before implementing -- an autonomous agent explores the codebase and writes
 |-----------|--------|----------|-------------|
 | `prompt`  | string | yes      | What to plan -- the goal, constraints, and scope. |

- **What it does**: Spawns a planning sub-agent with `AGENT_TOOLS` (read-only tools: `read_file`, `search`, `math`, `man`, `web_fetch`, `web_search`). The agent explores the codebase and writes a structured plan to `.plan-<session_id>.md` (unique per session, so concurrent workstreams never collide). If the `plan` tool has been called before in the same session, the prior plan is passed to the agent as context so it refines rather than restarts. After completion, the user is prompted to review and can accept, reject, or annotate the plan.
+- **What it does**: Spawns a planning sub-agent with `AGENT_TOOLS` (read-only tools: `read_file`, `search`, `math`, `man`, `web_fetch`, `web_search`). The agent explores the codebase and writes a structured plan to `.plan-<ws_id>.md` (unique per workstream, so concurrent workstreams never collide). If the `plan` tool has been called before in the same session, the prior plan is passed to the agent as context so it refines rather than restarts. After completion, the user is prompted to review and can accept, reject, or annotate the plan.
 - **Auto-approve**: No -- requires user confirmation, plus post-execution review gate.
 - **Agent availability**: Not available to sub-agents (top-level only).

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"

 [project]
 name = "turnstone"
-version = "0.4.2"
+version = "0.4.4"
 description = "Multi-node AI orchestration platform with tool use, agent routing, and cluster simulation."
 readme = "README.md"
 license = "BUSL-1.1"
@@ -2,7 +2,7 @@
  "openapi": "3.1.0",
  "info": {
    "title": "turnstone Server API",
-    "version": "0.3.0",
+    "version": "0.4.2",
    "description": "Single-node workstream management, chat interaction, and real-time streaming."
  },
  "paths": {
@@ -365,12 +365,12 @@
        }
      }
    },
-    "/v1/api/sessions": {
+    "/v1/api/workstreams/saved": {
      "get": {
-        "summary": "List saved sessions",
-        "operationId": "v1_api_sessions_get",
+        "summary": "List saved workstreams",
+        "operationId": "v1_api_workstreams_saved_get",
        "tags": [
-          "Sessions"
+          "Workstreams"
        ],
        "responses": {
          "200": {
@@ -378,7 +378,7 @@
            "content": {
              "application/json": {
                "schema": {
-                  "$ref": "#/components/schemas/ListSessionsResponse"
+                  "$ref": "#/components/schemas/ListSavedWorkstreamsResponse"
                }
              }
            }
@@ -427,6 +427,88 @@
        }
      }
    },
+    "/v1/api/auth/setup": {
+      "post": {
+        "summary": "Create first admin user",
+        "operationId": "v1_api_auth_setup_post",
+        "tags": [
+          "Auth"
+        ],
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/components/schemas/AuthSetupRequest"
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "Success",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/AuthSetupResponse"
+                }
+              }
+            }
+          },
+          "400": {
+            "description": "Error 400",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          },
+          "409": {
+            "description": "Error 409",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          },
+          "503": {
+            "description": "Error 503",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    "/v1/api/auth/status": {
+      "get": {
+        "summary": "Return auth state",
+        "operationId": "v1_api_auth_status_get",
+        "tags": [
+          "Auth"
+        ],
+        "responses": {
+          "200": {
+            "description": "Success",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/AuthStatusResponse"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
    "/v1/api/auth/logout": {
      "post": {
        "summary": "Clear auth cookie",
@@ -503,17 +585,27 @@
        "type": "object"
      },
      "AuthLoginRequest": {
-        "description": "POST /v1/api/auth/login request body.",
+        "description": "POST /v1/api/auth/login request body.\n\nEither username+password or token must be provided.",
        "properties": {
+          "username": {
+            "default": "",
+            "description": "Login username",
+            "title": "Username",
+            "type": "string"
+          },
+          "password": {
+            "default": "",
+            "description": "Login password",
+            "title": "Password",
+            "type": "string"
+          },
          "token": {
-            "description": "Bearer token to authenticate",
+            "default": "",
+            "description": "Legacy: bearer token to authenticate",
            "title": "Token",
            "type": "string"
          }
        },
-        "required": [
-          "token"
-        ],
        "title": "AuthLoginRequest",
        "type": "object"
      },
@@ -525,14 +617,35 @@
            "title": "Status",
            "type": "string"
          },
+          "user_id": {
+            "default": "",
+            "description": "Authenticated user ID",
+            "title": "User Id",
+            "type": "string"
+          },
          "role": {
-            "description": "Assigned role",
+            "description": "Legacy role",
            "examples": [
              "full",
              "read"
            ],
            "title": "Role",
            "type": "string"
+          },
+          "scopes": {
+            "default": "",
+            "description": "Comma-separated scopes",
+            "examples": [
+              "read,write,approve"
+            ],
+            "title": "Scopes",
+            "type": "string"
+          },
+          "jwt": {
+            "default": "",
+            "description": "JWT session token (if JWT auth is configured)",
+            "title": "Jwt",
+            "type": "string"
          }
        },
        "required": [
@@ -541,6 +654,97 @@
        "title": "AuthLoginResponse",
        "type": "object"
      },
+      "AuthSetupRequest": {
+        "description": "POST /v1/api/auth/setup request body.",
+        "properties": {
+          "username": {
+            "description": "Login username (1-64 ASCII characters)",
+            "title": "Username",
+            "type": "string"
+          },
+          "display_name": {
+            "description": "Display name",
+            "title": "Display Name",
+            "type": "string"
+          },
+          "password": {
+            "description": "Password (minimum 8 characters)",
+            "title": "Password",
+            "type": "string"
+          }
+        },
+        "required": [
+          "username",
+          "display_name",
+          "password"
+        ],
+        "title": "AuthSetupRequest",
+        "type": "object"
+      },
+      "AuthSetupResponse": {
+        "description": "POST /v1/api/auth/setup success response.",
+        "properties": {
+          "status": {
+            "default": "ok",
+            "title": "Status",
+            "type": "string"
+          },
+          "user_id": {
+            "title": "User Id",
+            "type": "string"
+          },
+          "username": {
+            "title": "Username",
+            "type": "string"
+          },
+          "role": {
+            "default": "full",
+            "title": "Role",
+            "type": "string"
+          },
+          "scopes": {
+            "default": "approve,read,write",
+            "title": "Scopes",
+            "type": "string"
+          },
+          "jwt": {
+            "default": "",
+            "description": "JWT session token",
+            "title": "Jwt",
+            "type": "string"
+          }
+        },
+        "required": [
+          "user_id",
+          "username"
+        ],
+        "title": "AuthSetupResponse",
+        "type": "object"
+      },
+      "AuthStatusResponse": {
+        "description": "GET /v1/api/auth/status response.",
+        "properties": {
+          "auth_enabled": {
+            "title": "Auth Enabled",
+            "type": "boolean"
+          },
+          "has_users": {
+            "title": "Has Users",
+            "type": "boolean"
+          },
+          "setup_required": {
+            "title": "Setup Required",
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "auth_enabled",
+          "has_users",
+          "setup_required"
+        ],
+        "title": "AuthStatusResponse",
+        "type": "object"
+      },
      "SendRequest": {
        "properties": {
          "message": {
@@ -677,6 +881,12 @@
            "description": "Auto-approve all tool calls",
            "title": "Auto Approve",
            "type": "boolean"
+          },
+          "resume_ws": {
+            "default": "",
+            "description": "Workstream ID to resume atomically during creation (empty = fresh start)",
+            "title": "Resume Ws",
+            "type": "string"
          }
        },
        "title": "CreateWorkstreamRequest",
@@ -693,6 +903,18 @@
            "description": "Assigned workstream name",
            "title": "Name",
            "type": "string"
+          },
+          "resumed": {
+            "default": false,
+            "description": "Whether a previous workstream was resumed",
+            "title": "Resumed",
+            "type": "boolean"
+          },
+          "message_count": {
+            "default": 0,
+            "description": "Number of messages in the resumed workstream",
+            "title": "Message Count",
+            "type": "integer"
          }
        },
        "required": [
@@ -745,18 +967,6 @@
          "state": {
            "title": "State",
            "type": "string"
-          },
-          "session_id": {
-            "anyOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ],
-            "default": null,
-            "title": "Session Id"
          }
        },
        "required": [
@@ -837,18 +1047,6 @@
            "title": "State",
            "type": "string"
          },
-          "session_id": {
-            "anyOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ],
-            "default": null,
-            "title": "Session Id"
-          },
          "title": {
            "default": "",
            "title": "Title",
@@ -903,26 +1101,26 @@
        "title": "DashboardWorkstream",
        "type": "object"
      },
-      "ListSessionsResponse": {
+      "ListSavedWorkstreamsResponse": {
        "properties": {
-          "sessions": {
+          "workstreams": {
            "items": {
-              "$ref": "#/components/schemas/SessionInfo"
+              "$ref": "#/components/schemas/SavedWorkstreamInfo"
            },
-            "title": "Sessions",
+            "title": "Workstreams",
            "type": "array"
          }
        },
        "required": [
-          "sessions"
+          "workstreams"
        ],
-        "title": "ListSessionsResponse",
+        "title": "ListSavedWorkstreamsResponse",
        "type": "object"
      },
-      "SessionInfo": {
+      "SavedWorkstreamInfo": {
        "properties": {
-          "session_id": {
-            "title": "Session Id",
+          "ws_id": {
+            "title": "Ws Id",
            "type": "string"
          },
          "alias": {
@@ -963,12 +1161,12 @@
          }
        },
        "required": [
-          "session_id",
+          "ws_id",
          "created",
          "updated",
          "message_count"
        ],
-        "title": "SessionInfo",
+        "title": "SavedWorkstreamInfo",
        "type": "object"
      },
      "HealthResponse": {
@@ -83,8 +83,8 @@ export type {
  DashboardWorkstream,
  DashboardAggregate,
  DashboardResponse,
-  SessionInfo,
-  ListSessionsResponse,
+  SavedWorkstreamInfo,
+  ListSavedWorkstreamsResponse,
  BackendStatus,
  WorkstreamCounts,
  HealthResponse,
@@ -8,7 +8,7 @@ import type {
  CreateWorkstreamResponse,
  DashboardResponse,
  HealthResponse,
-  ListSessionsResponse,
+  ListSavedWorkstreamsResponse,
  ListWorkstreamsResponse,
  SendAndWaitOptions,
  SendResponse,
@@ -178,10 +178,10 @@ export class TurnstoneServer extends BaseClient {
    return result;
  }

-  // -- Sessions -------------------------------------------------------------
+  // -- Saved workstreams ----------------------------------------------------

-  async listSessions(): Promise<ListSessionsResponse> {
-    return this.request("GET", "/v1/api/sessions");
+  async listSavedWorkstreams(): Promise<ListSavedWorkstreamsResponse> {
+    return this.request("GET", "/v1/api/workstreams/saved");
  }

  // -- Auth -----------------------------------------------------------------
@@ -71,14 +71,13 @@ export interface CreateWorkstreamRequest {
  name?: string;
  model?: string;
  auto_approve?: boolean;
-  resume_session?: string;
+  resume_ws?: string;
 }

 export interface CreateWorkstreamResponse {
  ws_id: string;
  name: string;
  resumed?: boolean;
-  session_id?: string;
  message_count?: number;
 }

@@ -90,7 +89,6 @@ export interface WorkstreamInfo {
  id: string;
  name: string;
  state: string;
-  session_id?: string | null;
 }

 export interface ListWorkstreamsResponse {
@@ -101,7 +99,6 @@ export interface DashboardWorkstream {
  id: string;
  name: string;
  state: string;
-  session_id?: string | null;
  title?: string;
  tokens?: number;
  context_ratio?: number;
@@ -128,11 +125,11 @@ export interface DashboardResponse {
 }

 // ---------------------------------------------------------------------------
-// Server API — Sessions
+// Server API — Saved workstreams
 // ---------------------------------------------------------------------------

-export interface SessionInfo {
-  session_id: string;
+export interface SavedWorkstreamInfo {
+  ws_id: string;
  alias?: string | null;
  title?: string | null;
  created: string;
@@ -140,8 +137,8 @@ export interface SessionInfo {
  message_count: number;
 }

-export interface ListSessionsResponse {
-  sessions: SessionInfo[];
+export interface ListSavedWorkstreamsResponse {
+  workstreams: SavedWorkstreamInfo[];
 }

 // ---------------------------------------------------------------------------
@@ -719,7 +719,7 @@ class TestServerAuth:
        srv_mod._metrics.model = "test-model"

        mock_session = MagicMock()
-        mock_session.session_id = "test-session-id"
+        mock_session.ws_id = "test-session-id"

        mock_ws = MagicMock()
        mock_ws.id = "test-ws"
@@ -937,7 +937,7 @@ class TestServerLogin:
        srv_mod._metrics.model = "test-model"

        mock_session = MagicMock()
-        mock_session.session_id = "test-session-id"
+        mock_session.ws_id = "test-session-id"

        mock_ws = MagicMock()
        mock_ws.id = "test-ws"
@@ -534,7 +534,7 @@ class TestWorkstreamModelParam:
            nonlocal captured_alias
            captured_alias = model_alias
            mock_session = MagicMock()
-            mock_session.session_id = "test123"
+            mock_session.ws_id = "test123"
            return mock_session

        mgr = WorkstreamManager(factory)
@@ -548,7 +548,7 @@ class TestWorkstreamModelParam:
            nonlocal captured_alias
            captured_alias = model_alias
            mock_session = MagicMock()
-            mock_session.session_id = "test123"
+            mock_session.ws_id = "test123"
            return mock_session

        from turnstone.core.workstream import WorkstreamManager
@@ -14,7 +14,7 @@ def _make_session() -> ChatSession:
    from unittest.mock import patch

    with (
-        patch("turnstone.core.session.register_session"),
+        patch("turnstone.core.memory.register_workstream"),
        patch("turnstone.core.session.save_message"),
    ):
        from turnstone.core.session import ChatSession
@@ -27,7 +27,7 @@ class TestServerSpec:
        expected = {
            "/v1/api/workstreams",
            "/v1/api/dashboard",
-            "/v1/api/sessions",
+            "/v1/api/workstreams/saved",
            "/v1/api/send",
            "/v1/api/approve",
            "/v1/api/plan",
@@ -1,6 +1,6 @@
 """Tests for the atomic workstream resumption flow.

-Covers CreateWorkstreamMessage resume_session field, SessionResumedEvent,
+Covers CreateWorkstreamMessage resume_ws field, WorkstreamResumedEvent,
 WorkstreamCreatedEvent resumed fields, and server endpoint handling.
 """

@@ -10,8 +10,8 @@ import json

 from turnstone.mq.protocol import (
    CreateWorkstreamMessage,
-    SessionResumedEvent,
    WorkstreamCreatedEvent,
+    WorkstreamResumedEvent,
 )

 # ---------------------------------------------------------------------------
@@ -20,93 +20,78 @@ from turnstone.mq.protocol import (


 class TestCreateWorkstreamMessageResumeField:
-    def test_resume_session_defaults_empty(self) -> None:
+    def test_resume_ws_defaults_empty(self) -> None:
        msg = CreateWorkstreamMessage(name="test")
-        assert msg.resume_session == ""
+        assert msg.resume_ws == ""

-    def test_resume_session_set(self) -> None:
-        msg = CreateWorkstreamMessage(name="test", resume_session="sess-abc")
-        assert msg.resume_session == "sess-abc"
+    def test_resume_ws_set(self) -> None:
+        msg = CreateWorkstreamMessage(name="test", resume_ws="ws-abc")
+        assert msg.resume_ws == "ws-abc"

-    def test_resume_session_serializes(self) -> None:
-        msg = CreateWorkstreamMessage(resume_session="sess-xyz")
+    def test_resume_ws_serializes(self) -> None:
+        msg = CreateWorkstreamMessage(resume_ws="ws-xyz")
        data = json.loads(msg.to_json())
-        assert data["resume_session"] == "sess-xyz"
+        assert data["resume_ws"] == "ws-xyz"

-    def test_resume_session_deserializes(self) -> None:
-        msg = CreateWorkstreamMessage(resume_session="sess-123")
+    def test_resume_ws_deserializes(self) -> None:
+        msg = CreateWorkstreamMessage(resume_ws="ws-123")
        raw = msg.to_json()
        from turnstone.mq.protocol import InboundMessage

        restored = InboundMessage.from_json(raw)
-        assert getattr(restored, "resume_session", "") == "sess-123"
+        assert getattr(restored, "resume_ws", "") == "ws-123"


 class TestWorkstreamCreatedEventResumeFields:
    def test_default_not_resumed(self) -> None:
        event = WorkstreamCreatedEvent(ws_id="ws-1", name="test")
        assert event.resumed is False
-        assert event.session_id == ""
        assert event.message_count == 0

    def test_resumed_fields(self) -> None:
-        event = WorkstreamCreatedEvent(
-            ws_id="ws-1", name="test", resumed=True, session_id="s-1", message_count=42
-        )
+        event = WorkstreamCreatedEvent(ws_id="ws-1", name="test", resumed=True, message_count=42)
        assert event.resumed is True
-        assert event.session_id == "s-1"
        assert event.message_count == 42

    def test_serializes_resumed_fields(self) -> None:
-        event = WorkstreamCreatedEvent(
-            ws_id="ws-1", resumed=True, session_id="s-1", message_count=10
-        )
+        event = WorkstreamCreatedEvent(ws_id="ws-1", resumed=True, message_count=10)
        data = json.loads(event.to_json())
        assert data["resumed"] is True
-        assert data["session_id"] == "s-1"
        assert data["message_count"] == 10

    def test_deserializes_resumed_fields(self) -> None:
-        event = WorkstreamCreatedEvent(
-            ws_id="ws-1", resumed=True, session_id="s-1", message_count=5
-        )
+        event = WorkstreamCreatedEvent(ws_id="ws-1", resumed=True, message_count=5)
        from turnstone.mq.protocol import OutboundEvent

        restored = OutboundEvent.from_json(event.to_json())
        assert isinstance(restored, WorkstreamCreatedEvent)
        assert restored.resumed is True
-        assert restored.session_id == "s-1"
        assert restored.message_count == 5


-class TestSessionResumedEvent:
+class TestWorkstreamResumedEvent:
    def test_defaults(self) -> None:
-        event = SessionResumedEvent(ws_id="ws-1")
-        assert event.type == "session_resumed"
-        assert event.session_id == ""
+        event = WorkstreamResumedEvent(ws_id="ws-1")
+        assert event.type == "ws_resumed"
        assert event.message_count == 0
        assert event.name == ""

    def test_with_values(self) -> None:
-        event = SessionResumedEvent(
-            ws_id="ws-1", session_id="s-abc", message_count=25, name="My Chat"
-        )
-        assert event.session_id == "s-abc"
+        event = WorkstreamResumedEvent(ws_id="ws-1", message_count=25, name="My Chat")
        assert event.message_count == 25
        assert event.name == "My Chat"

    def test_round_trip(self) -> None:
-        event = SessionResumedEvent(ws_id="ws-1", session_id="s-abc", message_count=10, name="Chat")
+        event = WorkstreamResumedEvent(ws_id="ws-1", message_count=10, name="Chat")
        from turnstone.mq.protocol import OutboundEvent

        restored = OutboundEvent.from_json(event.to_json())
-        assert isinstance(restored, SessionResumedEvent)
-        assert restored.session_id == "s-abc"
+        assert isinstance(restored, WorkstreamResumedEvent)
        assert restored.message_count == 10
        assert restored.name == "Chat"

    def test_registered_in_outbound_registry(self) -> None:
        from turnstone.mq.protocol import _OUTBOUND_REGISTRY

-        assert "session_resumed" in _OUTBOUND_REGISTRY
-        assert _OUTBOUND_REGISTRY["session_resumed"] is SessionResumedEvent
+        assert "ws_resumed" in _OUTBOUND_REGISTRY
+        assert _OUTBOUND_REGISTRY["ws_resumed"] is WorkstreamResumedEvent
@@ -148,19 +148,19 @@ async def test_command():


 # ---------------------------------------------------------------------------
-# Sessions
+# History
 # ---------------------------------------------------------------------------


@pytest.mark.anyio
-async def test_list_sessions():
+async def test_list_saved_workstreams():
    transport = _mock_transport(
        {
-            "GET /v1/api/sessions": _json_response(
+            "GET /v1/api/workstreams/saved": _json_response(
                {
-                    "sessions": [
+                    "workstreams": [
                        {
-                            "session_id": "s1",
+                            "ws_id": "s1",
                            "title": "test",
                            "created": "2024-01-01",
                            "updated": "2024-01-02",
@@ -173,8 +173,8 @@ async def test_list_sessions():
    )
    async with httpx.AsyncClient(transport=transport, base_url="http://test") as hc:
        client = AsyncTurnstoneServer(httpx_client=hc)
-        resp = await client.list_sessions()
-        assert len(resp.sessions) == 1
+        resp = await client.list_saved_workstreams()
+        assert len(resp.workstreams) == 1


 # ---------------------------------------------------------------------------
@@ -609,7 +609,7 @@ class TestServerHealthMetrics:
        mock_ui._ws_context_ratio = 0.0

        mock_session = MagicMock()
-        mock_session.session_id = "test-session-id"
+        mock_session.ws_id = "test-session-id"

        mock_ws = MagicMock()
        mock_ws.id = "test-ws"
@@ -785,7 +785,7 @@ class TestServerRateLimiting:
        mock_ui._ws_context_ratio = 0.0

        mock_session = MagicMock()
-        mock_session.session_id = "test-session-id"
+        mock_session.ws_id = "test-session-id"

        mock_ws = MagicMock()
        mock_ws.id = "test-ws"
@@ -161,12 +161,12 @@ class TestPlanExec:

        return call_id, content, captured.get("messages", [])

-    def test_plan_file_uses_session_id(self, tmp_db, tmp_path, monkeypatch):
-        """Plan file is named .plan-<session_id>.md, not .plan.md."""
+    def test_plan_file_uses_ws_id(self, tmp_db, tmp_path, monkeypatch):
+        """Plan file is named .plan-<ws_id>.md, not .plan.md."""
        monkeypatch.chdir(tmp_path)
        session = _make_session()
        self._run_plan(session, "add feature")
-        expected = tmp_path / f".plan-{session._session_id}.md"
+        expected = tmp_path / f".plan-{session._ws_id}.md"
        assert expected.exists(), f"Expected {expected} to be created"
        assert not (tmp_path / ".plan.md").exists()

@@ -176,7 +176,7 @@ class TestPlanExec:
        session = _make_session()
        plan_content = "## Goal\n\nAdd a new endpoint."
        self._run_plan(session, "add endpoint", agent_return=plan_content)
-        plan_file = tmp_path / f".plan-{session._session_id}.md"
+        plan_file = tmp_path / f".plan-{session._ws_id}.md"
        assert plan_file.read_text() == plan_content

    def test_two_sessions_produce_different_files(self, tmp_db, tmp_path, monkeypatch):
@@ -184,7 +184,7 @@ class TestPlanExec:
        monkeypatch.chdir(tmp_path)
        s1 = _make_session()
        s2 = _make_session()
-        assert s1._session_id != s2._session_id
+        assert s1._ws_id != s2._ws_id
        self._run_plan(s1, "feature A")
        self._run_plan(s2, "feature B")
        files = list(tmp_path.glob(".plan-*.md"))
@@ -1,155 +1,155 @@
-"""Tests for session persistence and resume functionality."""
+"""Tests for workstream persistence and resume functionality."""

 from unittest.mock import MagicMock

 import sqlalchemy as sa

 from turnstone.core.memory import (
-    delete_session,
-    list_sessions,
-    load_session_config,
-    load_session_messages,
-    prune_sessions,
-    register_session,
-    resolve_session,
+    delete_workstream,
+    list_workstreams_with_history,
+    load_messages,
+    load_workstream_config,
+    prune_workstreams,
+    register_workstream,
+    resolve_workstream,
    save_message,
-    save_session_config,
-    set_session_alias,
-    update_session_title,
+    save_workstream_config,
+    set_workstream_alias,
+    update_workstream_title,
 )
 from turnstone.core.session import ChatSession
 from turnstone.core.storage import get_storage

-# ── Session registration ──────────────────────────────────────────────
+# ── Workstream registration ───────────────────────────────────────────


-class TestRegisterSession:
+class TestRegisterWorkstream:
    def test_register_creates_row(self, tmp_db):
-        register_session("abc123")
-        # Session exists in DB (resolve works) even without messages
-        assert resolve_session("abc123") == "abc123"
+        register_workstream("abc123")
+        # Workstream exists in DB (resolve works) even without messages
+        assert resolve_workstream("abc123") == "abc123"

    def test_register_with_title(self, tmp_db):
-        register_session("abc123", title="My Session")
+        register_workstream("abc123", name="My Workstream")
        save_message("abc123", "user", "hello")
-        rows = list_sessions()
-        assert rows[0][2] == "My Session"  # title
+        rows = list_workstreams_with_history()
+        assert rows[0][2] is None  # title column (name is separate)

    def test_register_idempotent(self, tmp_db):
-        register_session("abc123", title="First")
-        register_session("abc123", title="Second")  # should be ignored
+        register_workstream("abc123")
+        update_workstream_title("abc123", "First")
+        register_workstream("abc123")  # should be ignored
+        update_workstream_title("abc123", "First")  # title is set via update
        save_message("abc123", "user", "hello")
-        rows = list_sessions()
+        rows = list_workstreams_with_history()
        assert len(rows) == 1
-        assert rows[0][2] == "First"  # original title preserved
+        assert rows[0][2] == "First"  # title preserved

    def test_update_title(self, tmp_db):
-        register_session("abc123")
-        update_session_title("abc123", "New Title")
+        register_workstream("abc123")
+        update_workstream_title("abc123", "New Title")
        save_message("abc123", "user", "hello")
-        rows = list_sessions()
+        rows = list_workstreams_with_history()
        assert rows[0][2] == "New Title"


-# ── Session alias ─────────────────────────────────────────────────────
+# ── Workstream alias ──────────────────────────────────────────────────


-class TestSessionAlias:
+class TestWorkstreamAlias:
    def test_set_alias(self, tmp_db):
-        register_session("abc123")
-        assert set_session_alias("abc123", "my-session") is True
+        register_workstream("abc123")
+        assert set_workstream_alias("abc123", "my-session") is True
        save_message("abc123", "user", "hello")
-        rows = list_sessions()
+        rows = list_workstreams_with_history()
        assert rows[0][1] == "my-session"  # alias

    def test_alias_conflict(self, tmp_db):
-        register_session("abc123")
-        register_session("def456")
-        set_session_alias("abc123", "taken")
-        assert set_session_alias("def456", "taken") is False
+        register_workstream("abc123")
+        register_workstream("def456")
+        set_workstream_alias("abc123", "taken")
+        assert set_workstream_alias("def456", "taken") is False

-    def test_alias_same_session_ok(self, tmp_db):
-        register_session("abc123")
-        set_session_alias("abc123", "mine")
-        assert set_session_alias("abc123", "mine") is True  # no-op, same session
+    def test_alias_same_workstream_ok(self, tmp_db):
+        register_workstream("abc123")
+        set_workstream_alias("abc123", "mine")
+        assert set_workstream_alias("abc123", "mine") is True  # no-op, same workstream


-# ── Session resolution ────────────────────────────────────────────────
+# ── Workstream resolution ─────────────────────────────────────────────


-class TestResolveSession:
+class TestResolveWorkstream:
    def test_resolve_by_alias(self, tmp_db):
-        register_session("abc123")
-        set_session_alias("abc123", "my-alias")
-        assert resolve_session("my-alias") == "abc123"
+        register_workstream("abc123")
+        set_workstream_alias("abc123", "my-alias")
+        assert resolve_workstream("my-alias") == "abc123"

    def test_resolve_by_exact_id(self, tmp_db):
-        register_session("abc123def456")
-        assert resolve_session("abc123def456") == "abc123def456"
+        register_workstream("abc123def456")
+        assert resolve_workstream("abc123def456") == "abc123def456"

    def test_resolve_by_prefix(self, tmp_db):
-        register_session("abc123def456")
-        assert resolve_session("abc123") == "abc123def456"
+        register_workstream("abc123def456")
+        assert resolve_workstream("abc123") == "abc123def456"

    def test_resolve_prefix_ambiguous(self, tmp_db):
-        register_session("abc123aaaaaa")
-        register_session("abc123bbbbbb")
+        register_workstream("abc123aaaaaa")
+        register_workstream("abc123bbbbbb")
        # Ambiguous prefix should return None
-        assert resolve_session("abc123") is None
+        assert resolve_workstream("abc123") is None

    def test_resolve_not_found(self, tmp_db):
-        assert resolve_session("nonexistent") is None
-
-    def test_resolve_legacy_session(self, tmp_db):
-        """Sessions that exist only in conversations (pre-migration) should auto-register."""
-        save_message("legacy123456", "user", "old message")
-        result = resolve_session("legacy123456")
-        assert result == "legacy123456"
-        # Should now appear in sessions list
-        rows = list_sessions()
-        assert any(r[0] == "legacy123456" for r in rows)
+        assert resolve_workstream("nonexistent") is None


-# ── List sessions ─────────────────────────────────────────────────────
+# ── List workstreams with history ──────────────────────────────────────


-class TestListSessions:
+class TestListWorkstreamsWithHistory:
    def test_empty(self, tmp_db):
-        assert list_sessions() == []
+        assert list_workstreams_with_history() == []

    def test_ordered_by_updated(self, tmp_db):
-        register_session("first")
+        register_workstream("first")
        save_message("first", "user", "hello")
-        register_session("second")
+        # Force an older timestamp so ordering is deterministic
+        engine = get_storage()._engine  # noqa: SLF001
+        with engine.connect() as conn:
+            conn.execute(
+                sa.text("UPDATE workstreams SET updated = '2020-01-01' WHERE ws_id = 'first'")
+            )
+            conn.commit()
+        register_workstream("second")
        save_message("second", "user", "hello")
        # second is more recent
-        rows = list_sessions()
+        rows = list_workstreams_with_history()
        assert rows[0][0] == "second"
        assert rows[1][0] == "first"

    def test_includes_message_count(self, tmp_db):
-        register_session("sess1")
+        register_workstream("sess1")
        save_message("sess1", "user", "hello")
        save_message("sess1", "assistant", "hi")
-        rows = list_sessions()
+        rows = list_workstreams_with_history()
        assert rows[0][5] == 2  # msg_count

    def test_respects_limit(self, tmp_db):
        for i in range(5):
-            register_session(f"sess{i}")
+            register_workstream(f"sess{i}")
            save_message(f"sess{i}", "user", "hello")
-        rows = list_sessions(limit=3)
+        rows = list_workstreams_with_history(limit=3)
        assert len(rows) == 3


-# ── Load session messages ─────────────────────────────────────────────
+# ── Load messages ─────────────────────────────────────────────────────


-class TestLoadSessionMessages:
+class TestLoadMessages:
    def test_simple_user_assistant(self, tmp_db):
        save_message("s1", "user", "hello")
        save_message("s1", "assistant", "hi there")
-        msgs = load_session_messages("s1")
+        msgs = load_messages("s1")
        assert len(msgs) == 2
        assert msgs[0] == {"role": "user", "content": "hello"}
        assert msgs[1] == {"role": "assistant", "content": "hi there"}
@@ -159,7 +159,7 @@ class TestLoadSessionMessages:
        save_message("s1", "assistant", "Let me check.")
        save_message("s1", "tool_call", None, "bash", '{"command":"ls"}', tool_call_id="call_abc")
        save_message("s1", "tool_result", "file1.txt\nfile2.txt", "bash", tool_call_id="call_abc")
-        msgs = load_session_messages("s1")
+        msgs = load_messages("s1")
        assert len(msgs) == 3  # user, assistant+tool_calls, tool
        # Assistant should have content merged with tool_calls
        assert msgs[1]["role"] == "assistant"
@@ -177,7 +177,7 @@ class TestLoadSessionMessages:
        save_message("s1", "user", "do stuff")
        save_message("s1", "tool_call", None, "bash", '{"command":"ls"}')
        save_message("s1", "tool_result", "output", "bash")
-        msgs = load_session_messages("s1")
+        msgs = load_messages("s1")
        assert len(msgs) == 3
        # Synthetic IDs should match
        tc_id = msgs[1]["tool_calls"][0]["id"]
@@ -189,36 +189,36 @@ class TestLoadSessionMessages:
        save_message("s1", "tool_call", None, "search", '{"query":"b"}', tool_call_id="call_2")
        save_message("s1", "tool_result", "result a", "search", tool_call_id="call_1")
        save_message("s1", "tool_result", "result b", "search", tool_call_id="call_2")
-        msgs = load_session_messages("s1")
+        msgs = load_messages("s1")
        assert len(msgs) == 4  # user, assistant+2 tool_calls, 2 tool results
        assert len(msgs[1]["tool_calls"]) == 2
        assert msgs[2]["tool_call_id"] == "call_1"
        assert msgs[3]["tool_call_id"] == "call_2"

-    def test_empty_session(self, tmp_db):
-        assert load_session_messages("nonexistent") == []
+    def test_empty_workstream(self, tmp_db):
+        assert load_messages("nonexistent") == []

    def test_orphaned_tool_result_skipped(self, tmp_db):
        save_message("s1", "user", "hello")
        save_message("s1", "tool_result", "orphan", "bash")
-        msgs = load_session_messages("s1")
+        msgs = load_messages("s1")
        assert len(msgs) == 1  # only the user message


-# ── Delete session ────────────────────────────────────────────────────
+# ── Delete workstream ─────────────────────────────────────────────────


-class TestDeleteSession:
-    def test_delete_removes_session_and_messages(self, tmp_db):
-        register_session("abc123")
+class TestDeleteWorkstream:
+    def test_delete_removes_workstream_and_messages(self, tmp_db):
+        register_workstream("abc123")
        save_message("abc123", "user", "hello")
        save_message("abc123", "assistant", "hi")
-        assert delete_session("abc123") is True
-        assert list_sessions() == []
-        assert load_session_messages("abc123") == []
+        assert delete_workstream("abc123") is True
+        assert list_workstreams_with_history() == []
+        assert load_messages("abc123") == []

    def test_delete_nonexistent(self, tmp_db):
-        assert delete_session("nonexistent") is True  # no-op, still returns True
+        assert delete_workstream("nonexistent") is False


 # ── save_message with tool_call_id ────────────────────────────────────
@@ -230,7 +230,7 @@ class TestSaveMessageToolCallId:
        engine = get_storage()._engine  # noqa: SLF001
        with engine.connect() as conn:
            row = conn.execute(
-                sa.text("SELECT tool_call_id FROM conversations WHERE session_id = 's1'")
+                sa.text("SELECT tool_call_id FROM conversations WHERE ws_id = 's1'")
            ).fetchone()
            assert row[0] == "call_xyz"

@@ -239,20 +239,20 @@ class TestSaveMessageToolCallId:
        engine = get_storage()._engine  # noqa: SLF001
        with engine.connect() as conn:
            row = conn.execute(
-                sa.text("SELECT tool_call_id FROM conversations WHERE session_id = 's1'")
+                sa.text("SELECT tool_call_id FROM conversations WHERE ws_id = 's1'")
            ).fetchone()
            assert row[0] is None


-# ── Sessions table creation ───────────────────────────────────────────
+# ── Workstreams table creation ────────────────────────────────────────


-class TestSessionsTable:
-    def test_sessions_table_exists(self, tmp_db):
+class TestWorkstreamsTable:
+    def test_workstreams_table_exists(self, tmp_db):
        engine = get_storage()._engine  # noqa: SLF001
        with engine.connect() as conn:
            rows = conn.execute(
-                sa.text("SELECT name FROM sqlite_master WHERE type='table' AND name='sessions'")
+                sa.text("SELECT name FROM sqlite_master WHERE type='table' AND name='workstreams'")
            ).fetchall()
            assert len(rows) == 1

@@ -263,15 +263,15 @@ class TestSessionsTable:
            conn.execute(sa.text("SELECT tool_call_id FROM conversations LIMIT 0"))


-# ── ChatSession.resume_session ────────────────────────────────────────
+# ── ChatSession.resume ────────────────────────────────────────────────


-class TestResumeSession:
+class TestResumeWorkstream:
    def test_resume_loads_messages(self, tmp_db, mock_openai_client):
-        # Set up a session with messages in DB
-        register_session("old_sess_123")
-        save_message("old_sess_123", "user", "hello world")
-        save_message("old_sess_123", "assistant", "hi there")
+        # Set up a workstream with messages in DB
+        register_workstream("old_ws_123")
+        save_message("old_ws_123", "user", "hello world")
+        save_message("old_ws_123", "assistant", "hi there")

        # Create a new session and resume
        session = ChatSession(
@@ -283,12 +283,12 @@ class TestResumeSession:
            max_tokens=1000,
            tool_timeout=10,
        )
-        original_id = session._session_id
-        assert original_id != "old_sess_123"
+        original_id = session._ws_id
+        assert original_id != "old_ws_123"

-        result = session.resume_session("old_sess_123")
+        result = session.resume("old_ws_123")
        assert result is True
-        assert session._session_id == "old_sess_123"
+        assert session._ws_id == "old_ws_123"
        assert len(session.messages) == 2
        assert session.messages[0]["content"] == "hello world"
        assert session._title_generated is True
@@ -303,9 +303,9 @@ class TestResumeSession:
            max_tokens=1000,
            tool_timeout=10,
        )
-        assert session.resume_session("nonexistent") is False
+        assert session.resume("nonexistent") is False

-    def test_session_registered_on_init(self, tmp_db, mock_openai_client):
+    def test_workstream_not_registered_until_message(self, tmp_db, mock_openai_client):
        session = ChatSession(
            client=mock_openai_client,
            model="test-model",
@@ -315,20 +315,19 @@ class TestResumeSession:
            max_tokens=1000,
            tool_timeout=10,
        )
-        # Session is registered in DB (resolvable) even before any messages
-        assert resolve_session(session._session_id) == session._session_id
-        # But does not appear in list_sessions until a message is saved
-        assert not any(r[0] == session._session_id for r in list_sessions())
+        # Workstream is not auto-registered on init — only on /new or server creation
+        assert resolve_workstream(session._ws_id) is None
+        assert not any(r[0] == session._ws_id for r in list_workstreams_with_history())


-# ── save_message updates sessions.updated ─────────────────────────────
+# ── save_message updates workstreams.updated ──────────────────────────


-class TestSaveMessageUpdatesSession:
+class TestSaveMessageUpdatesWorkstream:
    def test_updated_timestamp_bumped(self, tmp_db):
-        register_session("s1")
+        register_workstream("s1")
        save_message("s1", "user", "first")
-        rows = list_sessions()
+        rows = list_workstreams_with_history()
        _original_updated = rows[0][4]

        import time
@@ -336,18 +335,18 @@ class TestSaveMessageUpdatesSession:
        time.sleep(0.01)  # ensure different timestamp
        save_message("s1", "user", "hello")

-        rows = list_sessions()
+        rows = list_workstreams_with_history()
        new_updated = rows[0][4]
        # updated should be same or later (sqlite datetime resolution is seconds,
        # so they may be equal in fast tests — just verify no error)
        assert new_updated is not None


-# ── Interrupted session repair ───────────────────────────────────────
+# ── Interrupted workstream repair ─────────────────────────────────────


-class TestInterruptedSessionRepair:
-    """load_session_messages() should strip trailing incomplete tool call turns."""
+class TestInterruptedWorkstreamRepair:
+    """load_messages() should strip trailing incomplete tool call turns."""

    def test_complete_tool_turn_preserved(self, tmp_db):
        """2 tool_calls + 2 tool_results = complete, no stripping."""
@@ -356,7 +355,7 @@ class TestInterruptedSessionRepair:
        save_message("s1", "tool_call", None, "bash", '{"command":"pwd"}', "call_2")
        save_message("s1", "tool_result", "file.txt", tool_call_id="call_1")
        save_message("s1", "tool_result", "/home", tool_call_id="call_2")
-        msgs = load_session_messages("s1")
+        msgs = load_messages("s1")
        assert len(msgs) == 4  # user + assistant(2 calls) + 2 tool results

    def test_partial_tool_results_stripped(self, tmp_db):
@@ -365,7 +364,7 @@ class TestInterruptedSessionRepair:
        save_message("s1", "tool_call", None, "bash", '{"command":"ls"}', "call_1")
        save_message("s1", "tool_call", None, "bash", '{"command":"pwd"}', "call_2")
        save_message("s1", "tool_result", "file.txt", tool_call_id="call_1")
-        msgs = load_session_messages("s1")
+        msgs = load_messages("s1")
        assert len(msgs) == 1  # only user message remains
        assert msgs[0]["role"] == "user"

@@ -375,7 +374,7 @@ class TestInterruptedSessionRepair:
        save_message("s1", "assistant", "Let me check")
        save_message("s1", "tool_call", None, "bash", '{"command":"ls"}', "call_1")
        save_message("s1", "tool_call", None, "bash", '{"command":"pwd"}', "call_2")
-        msgs = load_session_messages("s1")
+        msgs = load_messages("s1")
        # assistant with content was merged into tool_call assistant, so stripped
        assert len(msgs) == 1
        assert msgs[0]["role"] == "user"
@@ -386,42 +385,42 @@ class TestInterruptedSessionRepair:
        save_message("s1", "assistant", "response")
        save_message("s1", "user", "second")
        save_message("s1", "tool_call", None, "bash", '{"command":"ls"}', "call_1")
-        msgs = load_session_messages("s1")
+        msgs = load_messages("s1")
        assert len(msgs) == 3  # user + assistant + user (incomplete turn stripped)
        assert msgs[0]["role"] == "user"
        assert msgs[1]["role"] == "assistant"
        assert msgs[2]["role"] == "user"


-# ── Session config persistence ───────────────────────────────────────
+# ── Workstream config persistence ─────────────────────────────────────


-class TestSessionConfig:
+class TestWorkstreamConfig:
    def test_save_load_roundtrip(self, tmp_db):
        config = {"temperature": "0.3", "reasoning_effort": "high", "creative_mode": "False"}
-        save_session_config("s1", config)
-        loaded = load_session_config("s1")
+        save_workstream_config("s1", config)
+        loaded = load_workstream_config("s1")
        assert loaded == config

    def test_update_existing_key(self, tmp_db):
-        save_session_config("s1", {"temperature": "0.3"})
-        save_session_config("s1", {"temperature": "0.7"})
-        loaded = load_session_config("s1")
+        save_workstream_config("s1", {"temperature": "0.3"})
+        save_workstream_config("s1", {"temperature": "0.7"})
+        loaded = load_workstream_config("s1")
        assert loaded["temperature"] == "0.7"

-    def test_missing_session_returns_empty(self, tmp_db):
-        loaded = load_session_config("nonexistent")
+    def test_missing_workstream_returns_empty(self, tmp_db):
+        loaded = load_workstream_config("nonexistent")
        assert loaded == {}

-    def test_delete_session_removes_config(self, tmp_db):
-        register_session("s1")
+    def test_delete_workstream_removes_config(self, tmp_db):
+        register_workstream("s1")
        save_message("s1", "user", "hi")
-        save_session_config("s1", {"temperature": "0.5"})
-        delete_session("s1")
-        assert load_session_config("s1") == {}
+        save_workstream_config("s1", {"temperature": "0.5"})
+        delete_workstream("s1")
+        assert load_workstream_config("s1") == {}

    def test_resume_restores_config(self, tmp_db):
-        """ChatSession.resume_session() should restore persisted config."""
+        """ChatSession.resume() should restore persisted config."""
        client = MagicMock()
        client.models.list.return_value.data = [MagicMock(id="test-model")]
        ui = MagicMock()
@@ -430,11 +429,11 @@ class TestSessionConfig:
        ui.on_state_change = MagicMock()
        ui.on_rename = MagicMock()

-        # Create a session with specific config
-        register_session("orig")
+        # Create a workstream with specific config
+        register_workstream("orig")
        save_message("orig", "user", "hello")
        save_message("orig", "assistant", "hi there")
-        save_session_config(
+        save_workstream_config(
            "orig",
            {
                "temperature": "0.3",
@@ -456,7 +455,7 @@ class TestSessionConfig:
            tool_timeout=30,
        )
        assert session.temperature == 0.7  # default
-        result = session.resume_session("orig")
+        result = session.resume("orig")
        assert result is True
        assert session.temperature == 0.3
        assert session.reasoning_effort == "high"
@@ -465,84 +464,84 @@ class TestSessionConfig:
        assert session.creative_mode is True


-# ── Prune sessions ───────────────────────────────────────────────────
+# ── Prune workstreams ─────────────────────────────────────────────────


-class TestPruneSessions:
+class TestPruneWorkstreams:
    def test_orphan_removed(self, tmp_db):
-        """Session registered with no messages should be pruned."""
-        register_session("orphan")
-        orphans, stale = prune_sessions()
+        """Workstream registered with no messages should be pruned."""
+        register_workstream("orphan")
+        orphans, stale = prune_workstreams()
        assert orphans == 1
-        assert list_sessions() == []
+        assert list_workstreams_with_history() == []

-    def test_session_with_messages_kept(self, tmp_db):
-        """Session with messages should not be pruned."""
-        register_session("active")
+    def test_workstream_with_messages_kept(self, tmp_db):
+        """Workstream with messages should not be pruned."""
+        register_workstream("active")
        save_message("active", "user", "hello")
-        orphans, _stale = prune_sessions()
+        orphans, _stale = prune_workstreams()
        assert orphans == 0
-        assert len(list_sessions()) == 1
+        assert len(list_workstreams_with_history()) == 1

    def test_stale_unnamed_removed(self, tmp_db):
-        """Old unnamed session should be pruned by retention policy."""
-        register_session("old1")
+        """Old unnamed workstream should be pruned by retention policy."""
+        register_workstream("old1")
        save_message("old1", "user", "ancient message")
        # Force the updated timestamp to the past so it looks stale
        engine = get_storage()._engine  # noqa: SLF001
        with engine.connect() as conn:
            conn.execute(
-                sa.text("UPDATE sessions SET updated = '2020-01-01' WHERE session_id = 'old1'")
+                sa.text("UPDATE workstreams SET updated = '2020-01-01' WHERE ws_id = 'old1'")
            )
            conn.commit()
-        _orphans, stale = prune_sessions(retention_days=30)
+        _orphans, stale = prune_workstreams(retention_days=30)
        assert stale == 1

-    def test_named_session_preserved(self, tmp_db):
-        """Session with alias should be kept regardless of age."""
-        register_session("old2")
-        set_session_alias("old2", "important")
+    def test_named_workstream_preserved(self, tmp_db):
+        """Workstream with alias should be kept regardless of age."""
+        register_workstream("old2")
+        set_workstream_alias("old2", "important")
        save_message("old2", "user", "old but named")
        # Force old timestamp
        engine = get_storage()._engine  # noqa: SLF001
        with engine.connect() as conn:
            conn.execute(
-                sa.text("UPDATE sessions SET updated = '2020-01-01' WHERE session_id = 'old2'")
+                sa.text("UPDATE workstreams SET updated = '2020-01-01' WHERE ws_id = 'old2'")
            )
            conn.commit()
-        _orphans, stale = prune_sessions(retention_days=30)
+        _orphans, stale = prune_workstreams(retention_days=30)
        assert stale == 0
-        assert len(list_sessions()) == 1
+        assert len(list_workstreams_with_history()) == 1

    def test_fresh_unnamed_preserved(self, tmp_db):
-        """Recent unnamed session should not be pruned."""
-        register_session("fresh")
+        """Recent unnamed workstream should not be pruned."""
+        register_workstream("fresh")
        save_message("fresh", "user", "just now")
-        _orphans, stale = prune_sessions(retention_days=30)
+        _orphans, stale = prune_workstreams(retention_days=30)
        assert stale == 0
-        assert len(list_sessions()) == 1
+        assert len(list_workstreams_with_history()) == 1

-    def test_prune_removes_session_config(self, tmp_db):
-        """Pruning orphan/stale sessions should also remove their config rows."""
-        register_session("orphan_cfg")
-        save_session_config("orphan_cfg", {"temperature": "0.5"})
+    def test_prune_removes_workstream_config(self, tmp_db):
+        """Pruning orphan/stale workstreams should also remove their config rows."""
+        register_workstream("orphan_cfg")
+        save_workstream_config("orphan_cfg", {"temperature": "0.5"})

-        register_session("stale_cfg")
+        register_workstream("stale_cfg")
        save_message("stale_cfg", "user", "old")
-        save_session_config("stale_cfg", {"temperature": "0.9"})
+        save_workstream_config("stale_cfg", {"temperature": "0.9"})
        engine = get_storage()._engine  # noqa: SLF001
        with engine.connect() as conn:
            conn.execute(
-                sa.text("UPDATE sessions SET updated = '2020-01-01' WHERE session_id = 'stale_cfg'")
+                sa.text("UPDATE workstreams SET updated = '2020-01-01' WHERE ws_id = 'stale_cfg'")
            )
            conn.commit()

        # Both should have config before prune
-        assert load_session_config("orphan_cfg") == {"temperature": "0.5"}
-        assert load_session_config("stale_cfg") == {"temperature": "0.9"}
+        assert load_workstream_config("orphan_cfg") == {"temperature": "0.5"}
+        assert load_workstream_config("stale_cfg") == {"temperature": "0.9"}

-        prune_sessions(retention_days=30)
+        prune_workstreams(retention_days=30)

        # Config rows should be cleaned up
-        assert load_session_config("orphan_cfg") == {}
-        assert load_session_config("stale_cfg") == {}
+        assert load_workstream_config("orphan_cfg") == {}
+        assert load_workstream_config("stale_cfg") == {}
@@ -14,28 +14,28 @@ def backend(tmp_path):
    reset_storage()


-# -- Session operations --------------------------------------------------------
+# -- Workstream registration ---------------------------------------------------


-class TestRegisterSession:
-    def test_register_creates_session(self, backend):
-        backend.register_session("s1", title="Test")
-        name = backend.get_session_name("s1")
+class TestRegisterWorkstream:
+    def test_register_creates_workstream(self, backend):
+        backend.register_workstream("s1", title="Test")
+        name = backend.get_workstream_display_name("s1")
        assert name == "Test"

    def test_register_idempotent(self, backend):
-        backend.register_session("s1", title="First")
-        backend.register_session("s1", title="Second")
-        name = backend.get_session_name("s1")
+        backend.register_workstream("s1", title="First")
+        backend.register_workstream("s1", title="Second")
+        name = backend.get_workstream_display_name("s1")
        assert name == "First"  # INSERT OR IGNORE preserves first


 class TestSaveAndLoadMessages:
    def test_roundtrip(self, backend):
-        backend.register_session("s1")
+        backend.register_workstream("s1")
        backend.save_message("s1", "user", "hello")
        backend.save_message("s1", "assistant", "world")
-        msgs = backend.load_session_messages("s1")
+        msgs = backend.load_messages("s1")
        assert len(msgs) == 2
        assert msgs[0]["role"] == "user"
        assert msgs[0]["content"] == "hello"
@@ -43,12 +43,12 @@ class TestSaveAndLoadMessages:
        assert msgs[1]["content"] == "world"

    def test_tool_call_grouping(self, backend):
-        backend.register_session("s1")
+        backend.register_workstream("s1")
        backend.save_message("s1", "user", "do something")
        backend.save_message("s1", "tool_call", None, "bash", '{"cmd":"ls"}', tool_call_id="c1")
        backend.save_message("s1", "tool_result", "file.txt", tool_call_id="c1")
        backend.save_message("s1", "assistant", "done")
-        msgs = backend.load_session_messages("s1")
+        msgs = backend.load_messages("s1")
        assert len(msgs) == 4
        assert msgs[1]["role"] == "assistant"
        assert len(msgs[1]["tool_calls"]) == 1
@@ -57,136 +57,136 @@ class TestSaveAndLoadMessages:
        assert msgs[2]["content"] == "file.txt"

    def test_incomplete_turn_repair(self, backend):
-        backend.register_session("s1")
+        backend.register_workstream("s1")
        backend.save_message("s1", "user", "do something")
        backend.save_message("s1", "tool_call", None, "bash", '{"cmd":"ls"}', tool_call_id="c1")
        backend.save_message("s1", "tool_call", None, "read", '{"path":"a"}', tool_call_id="c2")
        # Only 1 result for 2 calls — incomplete turn
        backend.save_message("s1", "tool_result", "ok", tool_call_id="c1")
-        msgs = backend.load_session_messages("s1")
+        msgs = backend.load_messages("s1")
        # Incomplete turn should be stripped
        assert len(msgs) == 1  # only the user message remains

    def test_provider_data_preserved(self, backend):
        import json

-        backend.register_session("s1")
+        backend.register_workstream("s1")
        pd = json.dumps({"encrypted": True})
        backend.save_message("s1", "assistant", "hi", provider_data=pd)
-        msgs = backend.load_session_messages("s1")
+        msgs = backend.load_messages("s1")
        assert msgs[0].get("_provider_content") == {"encrypted": True}

-    def test_empty_session_returns_empty(self, backend):
-        assert backend.load_session_messages("nonexistent") == []
+    def test_empty_workstream_returns_empty(self, backend):
+        assert backend.load_messages("nonexistent") == []


-class TestListSessions:
-    def test_lists_sessions_with_messages(self, backend):
-        backend.register_session("s1")
+class TestListWorkstreamsWithHistory:
+    def test_lists_workstreams_with_messages(self, backend):
+        backend.register_workstream("s1")
        backend.save_message("s1", "user", "hi")
-        backend.register_session("s2")  # no messages
-        rows = backend.list_sessions()
+        backend.register_workstream("s2")  # no messages
+        rows = backend.list_workstreams_with_history()
        assert len(rows) == 1
        assert rows[0][0] == "s1"

    def test_respects_limit(self, backend):
        for i in range(5):
            sid = f"s{i}"
-            backend.register_session(sid)
+            backend.register_workstream(sid)
            backend.save_message(sid, "user", f"msg {i}")
-        rows = backend.list_sessions(limit=3)
+        rows = backend.list_workstreams_with_history(limit=3)
        assert len(rows) == 3


-class TestDeleteSession:
+class TestDeleteWorkstream:
    def test_deletes_all_data(self, backend):
-        backend.register_session("s1")
+        backend.register_workstream("s1")
        backend.save_message("s1", "user", "hi")
-        backend.save_session_config("s1", {"temp": "0.5"})
-        assert backend.delete_session("s1")
-        assert backend.load_session_messages("s1") == []
-        assert backend.load_session_config("s1") == {}
-        assert backend.get_session_name("s1") is None
+        backend.save_workstream_config("s1", {"temp": "0.5"})
+        assert backend.delete_workstream("s1")
+        assert backend.load_messages("s1") == []
+        assert backend.load_workstream_config("s1") == {}
+        assert backend.get_workstream_display_name("s1") is None


-class TestPruneSessions:
+class TestPruneWorkstreams:
    def test_orphan_removed(self, backend):
-        backend.register_session("orphan")
-        orphans, stale = backend.prune_sessions()
+        backend.register_workstream("orphan")
+        orphans, stale = backend.prune_workstreams()
        assert orphans == 1

    def test_stale_removed(self, backend):
        import sqlalchemy as sa

-        backend.register_session("old")
+        backend.register_workstream("old")
        backend.save_message("old", "user", "hi")
        # Force old timestamp
        with backend._engine.connect() as conn:
            conn.execute(
-                sa.text("UPDATE sessions SET updated = '2020-01-01' WHERE session_id = 'old'")
+                sa.text("UPDATE workstreams SET updated = '2020-01-01' WHERE ws_id = 'old'")
            )
            conn.commit()
-        _, stale = backend.prune_sessions(retention_days=30)
+        _, stale = backend.prune_workstreams(retention_days=30)
        assert stale == 1


-class TestResolveSession:
+class TestResolveWorkstream:
    def test_exact_alias(self, backend):
-        backend.register_session("s1")
-        backend.set_session_alias("s1", "myalias")
-        assert backend.resolve_session("myalias") == "s1"
+        backend.register_workstream("s1")
+        backend.set_workstream_alias("s1", "myalias")
+        assert backend.resolve_workstream("myalias") == "s1"

    def test_exact_id(self, backend):
-        backend.register_session("abc-123-def")
-        assert backend.resolve_session("abc-123-def") == "abc-123-def"
+        backend.register_workstream("abc-123-def")
+        assert backend.resolve_workstream("abc-123-def") == "abc-123-def"

    def test_prefix_match(self, backend):
-        backend.register_session("abc-123-def")
-        assert backend.resolve_session("abc") == "abc-123-def"
+        backend.register_workstream("abc-123-def")
+        assert backend.resolve_workstream("abc") == "abc-123-def"

    def test_not_found(self, backend):
-        assert backend.resolve_session("nonexistent") is None
+        assert backend.resolve_workstream("nonexistent") is None


-# -- Session config ------------------------------------------------------------
+# -- Workstream config ---------------------------------------------------------


-class TestSessionConfig:
+class TestWorkstreamConfig:
    def test_roundtrip(self, backend):
-        backend.register_session("s1")
-        backend.save_session_config("s1", {"temperature": "0.7", "effort": "high"})
-        cfg = backend.load_session_config("s1")
+        backend.register_workstream("s1")
+        backend.save_workstream_config("s1", {"temperature": "0.7", "effort": "high"})
+        cfg = backend.load_workstream_config("s1")
        assert cfg == {"temperature": "0.7", "effort": "high"}

    def test_empty_config(self, backend):
-        assert backend.load_session_config("nonexistent") == {}
+        assert backend.load_workstream_config("nonexistent") == {}


-# -- Session metadata ----------------------------------------------------------
+# -- Workstream metadata ------------------------------------------------------


-class TestSessionMetadata:
+class TestWorkstreamMetadata:
    def test_alias(self, backend):
-        backend.register_session("s1")
-        assert backend.set_session_alias("s1", "my-session")
-        assert backend.get_session_name("s1") == "my-session"
+        backend.register_workstream("s1")
+        assert backend.set_workstream_alias("s1", "my-session")
+        assert backend.get_workstream_display_name("s1") == "my-session"

    def test_alias_conflict(self, backend):
-        backend.register_session("s1")
-        backend.register_session("s2")
-        backend.set_session_alias("s1", "taken")
-        assert not backend.set_session_alias("s2", "taken")
+        backend.register_workstream("s1")
+        backend.register_workstream("s2")
+        backend.set_workstream_alias("s1", "taken")
+        assert not backend.set_workstream_alias("s2", "taken")

    def test_title(self, backend):
-        backend.register_session("s1")
-        backend.update_session_title("s1", "My Title")
-        assert backend.get_session_name("s1") == "My Title"
+        backend.register_workstream("s1")
+        backend.update_workstream_title("s1", "My Title")
+        assert backend.get_workstream_display_name("s1") == "My Title"

    def test_alias_preferred_over_title(self, backend):
-        backend.register_session("s1")
-        backend.update_session_title("s1", "Title")
-        backend.set_session_alias("s1", "Alias")
-        assert backend.get_session_name("s1") == "Alias"
+        backend.register_workstream("s1")
+        backend.update_workstream_title("s1", "Title")
+        backend.set_workstream_alias("s1", "Alias")
+        assert backend.get_workstream_display_name("s1") == "Alias"


 # -- Key-value store -----------------------------------------------------------
@@ -234,7 +234,7 @@ class TestKVStore:

 class TestSearch:
    def test_search_history(self, backend):
-        backend.register_session("s1")
+        backend.register_workstream("s1")
        backend.save_message("s1", "user", "hello world")
        backend.save_message("s1", "user", "goodbye world")
        results = backend.search_history("hello")
@@ -242,7 +242,7 @@ class TestSearch:
        assert any("hello" in str(r[3]) for r in results)

    def test_search_recent(self, backend):
-        backend.register_session("s1")
+        backend.register_workstream("s1")
        backend.save_message("s1", "user", "msg1")
        backend.save_message("s1", "user", "msg2")
        results = backend.search_history_recent(limit=1)
@@ -293,15 +293,14 @@ class TestWorkstreams:
        assert len(rows) == 1
        assert rows[0][0] == "ws1"

-    def test_session_with_ws_id(self, backend):
+    def test_workstream_with_messages_in_history(self, backend):
        backend.register_workstream("ws1", node_id="node-a")
-        backend.register_session("s1", node_id="node-a", ws_id="ws1")
-        backend.save_message("s1", "user", "hello")
-        rows = backend.list_sessions()
+        backend.save_message("ws1", "user", "hello")
+        rows = backend.list_workstreams_with_history()
        assert len(rows) == 1
-        # Columns: sid, alias, title, created, updated, count, node_id, ws_id
+        # Columns: ws_id, alias, title, created, updated, count, node_id
+        assert rows[0][0] == "ws1"
        assert rows[0][6] == "node-a"
-        assert rows[0][7] == "ws1"


 # -- Lifecycle -----------------------------------------------------------------
@@ -127,21 +127,7 @@ class TestApiTokenCRUD:
        assert "expires" not in tok


-class TestSessionWorkstreamUserId:
-    def test_register_session_with_user_id(self, db):
-        db.register_session("s1", user_id="u1")
-        # Verify via raw SQL that user_id is stored
-        import sqlalchemy as sa
-
-        from turnstone.core.storage._schema import sessions
-
-        with db._engine.connect() as conn:
-            row = conn.execute(
-                sa.select(sessions.c.user_id).where(sessions.c.session_id == "s1")
-            ).fetchone()
-            assert row is not None
-            assert row[0] == "u1"
-
+class TestWorkstreamUserId:
    def test_register_workstream_with_user_id(self, db):
        db.register_workstream("ws1", user_id="u1")
        import sqlalchemy as sa
@@ -155,15 +141,15 @@ class TestSessionWorkstreamUserId:
            assert row is not None
            assert row[0] == "u1"

-    def test_register_session_without_user_id(self, db):
-        db.register_session("s1")
+    def test_register_workstream_without_user_id(self, db):
+        db.register_workstream("ws1")
        import sqlalchemy as sa

-        from turnstone.core.storage._schema import sessions
+        from turnstone.core.storage._schema import workstreams

        with db._engine.connect() as conn:
            row = conn.execute(
-                sa.select(sessions.c.user_id).where(sessions.c.session_id == "s1")
+                sa.select(workstreams.c.user_id).where(workstreams.c.ws_id == "ws1")
            ).fetchone()
            assert row is not None
            assert row[0] is None
@@ -1,3 +1,3 @@
 """turnstone - Multi-node AI orchestration platform with tool use, agent routing, and cluster simulation."""

-__version__ = "0.4.2"
+__version__ = "0.4.4"
@@ -39,18 +39,19 @@ class CreateWorkstreamRequest(BaseModel):
    name: str = Field(default="", description="Workstream display name (auto-generated if empty)")
    model: str = Field(default="", description="Model alias from registry")
    auto_approve: bool = Field(default=False, description="Auto-approve all tool calls")
-    resume_session: str = Field(
+    resume_ws: str = Field(
        default="",
-        description="Session ID to resume atomically during creation (empty = fresh start)",
+        description="Workstream ID to resume atomically during creation (empty = fresh start)",
    )


 class CreateWorkstreamResponse(BaseModel):
    ws_id: str = Field(description="Unique ID of the new workstream")
    name: str = Field(description="Assigned workstream name")
-    resumed: bool = Field(default=False, description="Whether a previous session was resumed")
-    session_id: str = Field(default="", description="Resolved session ID (set when resumed)")
-    message_count: int = Field(default=0, description="Number of messages in the resumed session")
+    resumed: bool = Field(default=False, description="Whether a previous workstream was resumed")
+    message_count: int = Field(
+        default=0, description="Number of messages in the resumed workstream"
+    )


 class CloseWorkstreamRequest(BaseModel):
@@ -66,7 +67,6 @@ class WorkstreamInfo(BaseModel):
    id: str
    name: str
    state: str
-    session_id: str | None = None


 class ListWorkstreamsResponse(BaseModel):
@@ -77,7 +77,6 @@ class DashboardWorkstream(BaseModel):
    id: str
    name: str
    state: str
-    session_id: str | None = None
    title: str = ""
    tokens: int = 0
    context_ratio: float = 0.0
@@ -104,12 +103,12 @@ class DashboardResponse(BaseModel):


 # ---------------------------------------------------------------------------
-# Sessions
+# Saved workstreams
 # ---------------------------------------------------------------------------


-class SessionInfo(BaseModel):
-    session_id: str
+class SavedWorkstreamInfo(BaseModel):
+    ws_id: str
    alias: str | None = None
    title: str | None = None
    created: str
@@ -117,8 +116,8 @@ class SessionInfo(BaseModel):
    message_count: int


-class ListSessionsResponse(BaseModel):
-    sessions: list[SessionInfo]
+class ListSavedWorkstreamsResponse(BaseModel):
+    workstreams: list[SavedWorkstreamInfo]


 # ---------------------------------------------------------------------------
@@ -25,7 +25,7 @@ from turnstone.api.server_schemas import (
    CreateWorkstreamResponse,
    DashboardResponse,
    HealthResponse,
-    ListSessionsResponse,
+    ListSavedWorkstreamsResponse,
    ListWorkstreamsResponse,
    PlanFeedbackRequest,
    SendRequest,
@@ -122,13 +122,13 @@ SERVER_ENDPOINTS: list[EndpointSpec] = [
        "across all workstreams. Returns text/event-stream.",
        tags=["Streaming"],
    ),
-    # --- Sessions ---
+    # --- Saved workstreams ---
    EndpointSpec(
-        "/v1/api/sessions",
+        "/v1/api/workstreams/saved",
        "GET",
-        "List saved sessions",
-        response_model=ListSessionsResponse,
-        tags=["Sessions"],
+        "List saved workstreams",
+        response_model=ListSavedWorkstreamsResponse,
+        tags=["Workstreams"],
    ),
    # --- Auth ---
    EndpointSpec(
@@ -191,7 +191,7 @@ _ALL_MODELS: list[type[BaseModel]] = [
    CloseWorkstreamRequest,
    ListWorkstreamsResponse,
    DashboardResponse,
-    ListSessionsResponse,
+    ListSavedWorkstreamsResponse,
    HealthResponse,
 ]

@@ -150,7 +150,7 @@ class ChannelRouter:
                owner = await self._broker.get_ws_owner(route["ws_id"])
                if owner:
                    return route["ws_id"], False
-                # Workstream was evicted/closed — capture old ws_id for session
+                # Workstream was evicted/closed — capture old ws_id for
                # resume, then remove the stale route.
                old_ws_id = route["ws_id"]
                await asyncio.to_thread(
@@ -163,20 +163,13 @@ class ChannelRouter:
                    channel_id=channel_id,
                )

-            # 2. Look up old session for atomic resume (if stale route).
-            resume_session = ""
-            if old_ws_id:
-                old_sid: str | None = await asyncio.to_thread(
-                    self._storage.get_session_id_by_ws, old_ws_id
-                )
-                resume_session = old_sid or ""
-
-            # 3. Create via MQ with atomic resume.
+            # 2. Create via MQ with atomic resume (reuse old ws_id directly).
+            resume_ws = old_ws_id or ""
            msg = CreateWorkstreamMessage(
                name=name,
                model=model,
-                initial_message="" if resume_session else initial_message,
-                resume_session=resume_session,
+                initial_message="" if resume_ws else initial_message,
+                resume_ws=resume_ws,
                auto_approve=self._auto_approve,
                auto_approve_tools=list(self._auto_approve_tools),
            )
@@ -190,7 +183,7 @@ class ChannelRouter:
                correlation_id=cid,
                channel_type=channel_type,
                channel_id=channel_id,
-                resume_session=resume_session or None,
+                resume_ws=resume_ws or None,
            )

            try:
@@ -21,8 +21,8 @@ from turnstone.mq.protocol import (
    ErrorEvent,
    OutboundEvent,
    PlanReviewEvent,
-    SessionResumedEvent,
    TurnCompleteEvent,
+    WorkstreamResumedEvent,
 )

 if TYPE_CHECKING:
@@ -307,10 +307,10 @@ class TurnstoneBot:
            if sm is not None:
                await sm.finalize()

-        elif isinstance(event, SessionResumedEvent):
-            name = event.name or "previous session"
+        elif isinstance(event, WorkstreamResumedEvent):
+            name = event.name or "previous workstream"
            count = event.message_count
-            await thread.send(f"*Session resumed: {name} ({count} messages restored)*")
+            await thread.send(f"*Resumed: {name} ({count} messages restored)*")

        elif isinstance(event, ErrorEvent):
            safe_msg = event.message[:500] if event.message else "An error occurred"
@@ -41,7 +41,7 @@ SLASH_COMMANDS = [
    "/instructions",
    "/clear",
    "/new",
-    "/sessions",
+    "/workstreams",
    "/resume",
    "/name",
    "/delete",
@@ -787,8 +787,8 @@ def main() -> None:
    parser.add_argument(
        "--resume",
        default=None,
-        metavar="SESSION",
-        help="Resume a previous session by alias or session_id",
+        metavar="WS",
+        help="Resume a previous workstream by alias or ws_id",
    )
    parser.add_argument(
        "--skip-permissions",
@@ -801,11 +801,11 @@ def main() -> None:
        help="API key (default: $OPENAI_API_KEY, or 'dummy' for local servers)",
    )
    parser.add_argument(
-        "--session-retention-days",
+        "--retention-days",
        type=int,
        default=90,
        metavar="DAYS",
-        help="Delete unnamed sessions older than DAYS days on startup, 0 to disable (default: 90)",
+        help="Delete unnamed workstreams older than DAYS days on startup, 0 to disable (default: 90)",
    )
    parser.add_argument(
        "--console-url",
@@ -845,10 +845,10 @@ def main() -> None:
    )
    init_storage(db_backend, path=db_path, url=db_url, pool_size=db_pool_size)

-    # Prune stale / empty sessions on startup
-    from turnstone.core.memory import prune_sessions
+    # Prune stale / empty workstreams on startup
+    from turnstone.core.memory import prune_workstreams

-    prune_sessions(retention_days=args.session_retention_days, log_fn=print)
+    prune_workstreams(retention_days=args.retention_days, log_fn=print)

    # Set up readline
    setup_readline()
@@ -894,7 +894,7 @@ def main() -> None:

    mcp_client = create_mcp_client(getattr(args, "mcp_config", None))

-    # Session factory — captures shared config for creating workstream sessions
+    # ChatSession factory — captures shared config for creating workstreams
    def session_factory(
        ui: SessionUI | None, model_alias: str | None = None, ws_id: str | None = None
    ) -> ChatSession:
@@ -929,19 +929,19 @@ def main() -> None:

    # Handle --resume
    if args.resume:
-        from turnstone.core.memory import resolve_session
+        from turnstone.core.memory import resolve_workstream

-        target_id = resolve_session(args.resume)
+        target_id = resolve_workstream(args.resume)
        if not target_id:
-            print(red(f"Session not found: {args.resume}"))
+            print(red(f"Workstream not found: {args.resume}"))
            sys.exit(1)
        if ws.session is None:
            print(red("No session available."))
            sys.exit(1)
-        if not ws.session.resume_session(target_id):
-            print(red(f"Session '{args.resume}' has no messages."))
+        if not ws.session.resume(target_id):
+            print(red(f"Workstream '{args.resume}' has no messages."))
            sys.exit(1)
-        print(f"Resumed session {bold(target_id)} ({len(ws.session.messages)} messages)")
+        print(f"Resumed workstream {bold(target_id)} ({len(ws.session.messages)} messages)")

    # Background attention notification — write to stderr while user types
    def _bg_attention_notify(ws_id: str, state: WorkstreamState) -> None:
@@ -61,7 +61,7 @@ _CONFIG_MAP: dict[str, dict[str, str]] = {
    },
    "session": {
        "instructions": "instructions",
-        "retention_days": "session_retention_days",
+        "retention_days": "retention_days",
        "compact_max_tokens": "compact_max_tokens",
        "auto_compact_pct": "auto_compact_pct",
    },
@@ -21,22 +21,11 @@ def normalize_key(key: str) -> str:
    return key.lower().replace("-", "_").replace(" ", "_")


-# -- Core session operations ---------------------------------------------------
-
-
-def register_session(
-    session_id: str,
-    title: str | None = None,
-    node_id: str | None = None,
-    ws_id: str | None = None,
-) -> None:
-    """Create a sessions row for a new session (no-op if already exists)."""
-    with contextlib.suppress(Exception):
-        get_storage().register_session(session_id, title, node_id=node_id, ws_id=ws_id)
+# -- Core conversation operations ---------------------------------------------


 def save_message(
-    session_id: str,
+    ws_id: str,
    role: str,
    content: str | None,
    tool_name: str | None = None,
@@ -47,111 +36,19 @@ def save_message(
    """Log a message to the conversations table."""
    with contextlib.suppress(Exception):
        get_storage().save_message(
-            session_id, role, content, tool_name, tool_args, tool_call_id, provider_data
+            ws_id, role, content, tool_name, tool_args, tool_call_id, provider_data
        )


-def load_session_messages(session_id: str) -> list[dict[str, Any]]:
-    """Load messages for a session and reconstruct OpenAI message format."""
+def load_messages(ws_id: str) -> list[dict[str, Any]]:
+    """Load messages for a workstream and reconstruct OpenAI message format."""
    try:
-        return get_storage().load_session_messages(session_id)
+        return get_storage().load_messages(ws_id)
    except Exception:
        return []


-# -- Session management --------------------------------------------------------
-
-
-def list_sessions(limit: int = 20) -> list[Any]:
-    """List recent sessions with message counts."""
-    try:
-        return get_storage().list_sessions(limit)
-    except Exception:
-        return []
-
-
-def delete_session(session_id: str) -> bool:
-    """Delete a session and all its messages."""
-    try:
-        return get_storage().delete_session(session_id)
-    except Exception:
-        return False
-
-
-def prune_sessions(
-    retention_days: int = 90,
-    log_fn: Callable[[str], None] | None = None,
-) -> tuple[int, int]:
-    """Prune orphaned and stale sessions."""
-    try:
-        orphans, stale = get_storage().prune_sessions(retention_days)
-    except Exception:
-        return (0, 0)
-
-    if log_fn and (orphans or stale):
-        parts = []
-        if orphans:
-            parts.append(f"{orphans} empty session{'s' if orphans != 1 else ''}")
-        if stale:
-            parts.append(
-                f"{stale} session{'s' if stale != 1 else ''} older than {retention_days} days"
-            )
-        log_fn(f"[turnstone] Session cleanup: removed {', '.join(parts)}.")
-
-    return (orphans, stale)
-
-
-def resolve_session(alias_or_id: str) -> str | None:
-    """Resolve an alias or session_id (or prefix) to a full session_id."""
-    try:
-        return get_storage().resolve_session(alias_or_id)
-    except Exception:
-        return None
-
-
-# -- Session config ------------------------------------------------------------
-
-
-def save_session_config(session_id: str, config: dict[str, str]) -> None:
-    """Persist session configuration key/value pairs."""
-    with contextlib.suppress(Exception):
-        get_storage().save_session_config(session_id, config)
-
-
-def load_session_config(session_id: str) -> dict[str, str]:
-    """Load session configuration."""
-    try:
-        return get_storage().load_session_config(session_id)
-    except Exception:
-        return {}
-
-
-# -- Session metadata ----------------------------------------------------------
-
-
-def set_session_alias(session_id: str, alias: str) -> bool:
-    """Set a human-friendly alias. Returns False if alias is taken."""
-    try:
-        return get_storage().set_session_alias(session_id, alias)
-    except Exception:
-        return False
-
-
-def get_session_name(session_id: str) -> str | None:
-    """Return the alias (or title) for a session, or None if unset."""
-    try:
-        return get_storage().get_session_name(session_id)
-    except Exception:
-        return None
-
-
-def update_session_title(session_id: str, title: str) -> None:
-    """Set or update the auto-generated title for a session."""
-    with contextlib.suppress(Exception):
-        get_storage().update_session_title(session_id, title)
-
-
-# -- Workstream operations -----------------------------------------------------
+# -- Workstream management ----------------------------------------------------


 def register_workstream(
@@ -182,6 +79,95 @@ def list_workstreams(node_id: str | None = None, limit: int = 100) -> list[Any]:
        return []


+def list_workstreams_with_history(limit: int = 20) -> list[Any]:
+    """List workstreams that have conversation messages."""
+    try:
+        return get_storage().list_workstreams_with_history(limit)
+    except Exception:
+        return []
+
+
+def delete_workstream(ws_id: str) -> bool:
+    """Delete a workstream and all its conversations + config."""
+    try:
+        return get_storage().delete_workstream(ws_id)
+    except Exception:
+        return False
+
+
+def prune_workstreams(
+    retention_days: int = 90,
+    log_fn: Callable[[str], None] | None = None,
+) -> tuple[int, int]:
+    """Prune orphaned and stale workstreams."""
+    try:
+        orphans, stale = get_storage().prune_workstreams(retention_days)
+    except Exception:
+        return (0, 0)
+
+    if log_fn and (orphans or stale):
+        parts = []
+        if orphans:
+            parts.append(f"{orphans} empty workstream{'s' if orphans != 1 else ''}")
+        if stale:
+            parts.append(
+                f"{stale} workstream{'s' if stale != 1 else ''} older than {retention_days} days"
+            )
+        log_fn(f"[turnstone] Cleanup: removed {', '.join(parts)}.")
+
+    return (orphans, stale)
+
+
+def resolve_workstream(alias_or_id: str) -> str | None:
+    """Resolve an alias or ws_id (or prefix) to a full ws_id."""
+    try:
+        return get_storage().resolve_workstream(alias_or_id)
+    except Exception:
+        return None
+
+
+# -- Workstream config --------------------------------------------------------
+
+
+def save_workstream_config(ws_id: str, config: dict[str, str]) -> None:
+    """Persist workstream configuration key/value pairs."""
+    with contextlib.suppress(Exception):
+        get_storage().save_workstream_config(ws_id, config)
+
+
+def load_workstream_config(ws_id: str) -> dict[str, str]:
+    """Load workstream configuration."""
+    try:
+        return get_storage().load_workstream_config(ws_id)
+    except Exception:
+        return {}
+
+
+# -- Workstream metadata ------------------------------------------------------
+
+
+def set_workstream_alias(ws_id: str, alias: str) -> bool:
+    """Set a human-friendly alias. Returns False if alias is taken."""
+    try:
+        return get_storage().set_workstream_alias(ws_id, alias)
+    except Exception:
+        return False
+
+
+def get_workstream_display_name(ws_id: str) -> str | None:
+    """Return the alias (or title) for a workstream, or None if unset."""
+    try:
+        return get_storage().get_workstream_display_name(ws_id)
+    except Exception:
+        return None
+
+
+def update_workstream_title(ws_id: str, title: str) -> None:
+    """Set or update the auto-generated title for a workstream."""
+    with contextlib.suppress(Exception):
+        get_storage().update_workstream_title(ws_id, title)
+
+
 # -- Key-value store (memories) ------------------------------------------------


@@ -259,19 +259,13 @@ class MetricsCollector:

        # Per-workstream metrics (only when data is provided)
        if workstream_metrics:
-            # turnstone_workstream_info — exposes session_id as a label for joining,
-            # without propagating that high-cardinality label to counters.
-            lines.append(
-                "# HELP turnstone_workstream_info Workstream metadata"
-                " (join on session_id for per-session queries)"
-            )
+            lines.append("# HELP turnstone_workstream_info Workstream metadata")
            lines.append("# TYPE turnstone_workstream_info gauge")
            for wm in workstream_metrics:
                lstr = _fmt_labels(
                    {
                        "ws_id": wm["ws_id"],
                        "name": wm["name"],
-                        "session_id": wm["session_id"],
                    }
                )
                lines.append(f"turnstone_workstream_info{lstr} 1")
@@ -29,23 +29,22 @@ from turnstone.core.edit import find_occurrences, pick_nearest
 from turnstone.core.log import get_logger
 from turnstone.core.memory import (
    delete_memory,
-    delete_session,
-    get_session_name,
-    list_sessions,
+    delete_workstream,
+    get_workstream_display_name,
+    list_workstreams_with_history,
    load_memories,
-    load_session_config,
-    load_session_messages,
+    load_messages,
+    load_workstream_config,
    normalize_key,
-    register_session,
-    resolve_session,
+    resolve_workstream,
    save_memory,
    save_message,
-    save_session_config,
+    save_workstream_config,
    search_history,
    search_history_recent,
    search_memories,
-    set_session_alias,
-    update_session_title,
+    set_workstream_alias,
+    update_workstream_title,
 )
 from turnstone.core.providers import create_provider
 from turnstone.core.safety import is_command_blocked, sanitize_command
@@ -192,10 +191,8 @@ class ChatSession:
        self.debug = False
        self.auto_approve = False
        self._node_id = node_id
-        self._ws_id = ws_id
-        self._session_id = uuid.uuid4().hex
+        self._ws_id = ws_id or uuid.uuid4().hex
        self._title_generated = False
-        register_session(self._session_id, node_id=self._node_id, ws_id=self._ws_id)
        self._read_files: set[str] = set()
        self.messages: list[dict[str, Any]] = []
        self._last_usage: dict[str, int] | None = None
@@ -219,17 +216,17 @@ class ChatSession:
        self._save_config()

    @property
-    def session_id(self) -> str:
-        return self._session_id
+    def ws_id(self) -> str:
+        return self._ws_id

    @property
    def model_alias(self) -> str | None:
        return self._model_alias

    def _save_config(self) -> None:
-        """Persist LLM-affecting config so resumed sessions behave identically."""
-        save_session_config(
-            self._session_id,
+        """Persist LLM-affecting config so resumed workstreams behave identically."""
+        save_workstream_config(
+            self._ws_id,
            {
                "temperature": str(self.temperature),
                "reasoning_effort": self.reasoning_effort,
@@ -298,32 +295,32 @@ class ChatSession:
            # Take first line, strip quotes
            title = raw.split("\n")[0].strip().strip('"').strip("'")
            if title:
-                update_session_title(self._session_id, title[:80])
+                update_workstream_title(self._ws_id, title[:80])
        except Exception:
            pass  # Title generation is non-critical

-    def resume_session(self, session_id: str) -> bool:
-        """Load messages from a previous session and resume it.
+    def resume(self, ws_id: str) -> bool:
+        """Load messages from a previous workstream and resume it.

        Replaces the current conversation with the loaded messages,
-        adopting the old session_id so new messages continue in the same
-        session.  Restores persisted config (temperature, reasoning_effort,
-        etc.) so the resumed session behaves identically to the original.
+        adopting the old ws_id so new messages continue in the same
+        workstream.  Restores persisted config (temperature, reasoning_effort,
+        etc.) so the resumed workstream behaves identically to the original.
        Returns True on success.
        """
-        messages = load_session_messages(session_id)
+        messages = load_messages(ws_id)
        if not messages:
            return False
-        self._session_id = session_id
+        self._ws_id = ws_id
        self.messages = messages
        self._read_files.clear()
        self._last_usage = None
-        self._title_generated = True  # don't re-title resumed sessions
+        self._title_generated = True  # don't re-title resumed workstreams
        self._msg_tokens = [
            max(1, int(self._msg_char_count(m) / self._chars_per_token)) for m in self.messages
        ]
        # Restore persisted config
-        config = load_session_config(session_id)
+        config = load_workstream_config(ws_id)
        if config:
            if "temperature" in config:
                self.temperature = float(config["temperature"])
@@ -513,7 +510,7 @@ class ChatSession:
        self._notify_count = 0
        self.messages.append({"role": "user", "content": user_input})
        self._msg_tokens.append(max(1, int(len(user_input) / self._chars_per_token)))
-        save_message(self._session_id, "user", user_input)
+        save_message(self._ws_id, "user", user_input)

        try:
            while True:
@@ -549,9 +546,7 @@ class ChatSession:

                    provider_data = _json.dumps(assistant_msg["_provider_content"])
                if content or provider_data is not None:
-                    save_message(
-                        self._session_id, "assistant", content, provider_data=provider_data
-                    )
+                    save_message(self._ws_id, "assistant", content, provider_data=provider_data)
                if tc:
                    for call in tc:
                        fn = call.get("function", {})
@@ -562,7 +557,7 @@ class ChatSession:
                            "recall",
                        ):
                            save_message(
-                                self._session_id,
+                                self._ws_id,
                                "tool_call",
                                None,
                                name,
@@ -612,7 +607,7 @@ class ChatSession:
                        "recall",
                    ):
                        save_message(
-                            self._session_id,
+                            self._ws_id,
                            "tool_result",
                            output[:2000],
                            _tname,
@@ -2327,9 +2322,9 @@ class ChatSession:
    )

    def _exec_plan(self, item: dict[str, Any]) -> tuple[str, str]:
-        """Run a planning agent and write the result to .plan-<session_id>.md."""
+        """Run a planning agent and write the result to .plan-<ws_id>.md."""
        call_id, prompt = item["call_id"], item["prompt"]
-        plan_path = f".plan-{self._session_id}.md"
+        plan_path = f".plan-{self._ws_id}.md"

        # If plan was called before in this session, the previous assistant
        # tool_call + tool result are already in self.messages — pass them
@@ -2908,29 +2903,31 @@ class ChatSession:
            self._read_files.clear()
            self._last_usage = None
            self._msg_tokens = []
-            self.ui.on_info("Context cleared (session preserved in database).")
+            self.ui.on_info("Context cleared (messages preserved in database).")

        elif cmd == "/new":
+            from turnstone.core.memory import register_workstream
+
            self.messages.clear()
            self._read_files.clear()
            self._last_usage = None
            self._msg_tokens = []
-            self._session_id = uuid.uuid4().hex
+            self._ws_id = uuid.uuid4().hex
            self._title_generated = False
-            register_session(self._session_id, node_id=self._node_id, ws_id=self._ws_id)
+            register_workstream(self._ws_id, node_id=self._node_id)
            self._save_config()
-            self.ui.on_info("New session started.")
+            self.ui.on_info("New workstream started.")

-        elif cmd == "/sessions":
-            rows = list_sessions(limit=20)
+        elif cmd == "/workstreams":
+            rows = list_workstreams_with_history(limit=20)
            if not rows:
-                self.ui.on_info("No saved sessions.")
+                self.ui.on_info("No saved workstreams.")
            else:
-                lines = ["Sessions:\n"]
-                for sid, alias, title, _created, updated, count, *_extra in rows:
-                    display_name = alias or sid
+                lines = ["Workstreams:\n"]
+                for wid, alias, title, _created, updated, count, *_extra in rows:
+                    display_name = alias or wid
                    display_title = f"  {title}" if title else ""
-                    marker = " *" if sid == self._session_id else "  "
+                    marker = " *" if wid == self._ws_id else "  "
                    lines.append(
                        f" {marker} {bold(display_name)}{display_title}  "
                        f"{dim(f'{count} msgs, {updated}')}"
@@ -2940,30 +2937,29 @@ class ChatSession:
        elif cmd == "/resume":
            if not arg:
                self.ui.on_info(
-                    "Usage: /resume <alias_or_session_id>\n"
-                    "Use /sessions to list available sessions."
+                    "Usage: /resume <alias_or_ws_id>\nUse /workstreams to list available workstreams."
                )
            else:
-                target_id = resolve_session(arg.strip())
+                target_id = resolve_workstream(arg.strip())
                if not target_id:
-                    self.ui.on_info(f"Session not found: {arg.strip()}")
-                elif target_id == self._session_id:
-                    self.ui.on_info("Already in that session.")
-                elif self.resume_session(target_id):
+                    self.ui.on_info(f"Workstream not found: {arg.strip()}")
+                elif target_id == self._ws_id:
+                    self.ui.on_info("Already in that workstream.")
+                elif self.resume(target_id):
                    self.ui.on_info(
-                        f"Resumed session {bold(target_id)} ({len(self.messages)} messages loaded)"
+                        f"Resumed {bold(target_id)} ({len(self.messages)} messages loaded)"
                    )
-                    name = get_session_name(target_id)
+                    name = get_workstream_display_name(target_id)
                    if name:
                        self.ui.on_rename(name)
                else:
-                    self.ui.on_info(f"Session {arg.strip()} has no messages.")
+                    self.ui.on_info(f"Workstream {arg.strip()} has no messages.")

        elif cmd == "/name":
            if not arg:
-                self.ui.on_info(f"Current session: {self._session_id}")
-            elif set_session_alias(self._session_id, arg.strip()):
-                self.ui.on_info(f"Session named: {bold(arg.strip())}")
+                self.ui.on_info(f"Current workstream: {self._ws_id}")
+            elif set_workstream_alias(self._ws_id, arg.strip()):
+                self.ui.on_info(f"Workstream named: {bold(arg.strip())}")
                self.ui.on_rename(arg.strip())
            else:
                self.ui.on_info(f"Alias '{arg.strip()}' is already in use.")
@@ -2971,18 +2967,18 @@ class ChatSession:
        elif cmd == "/delete":
            if not arg:
                self.ui.on_info(
-                    "Usage: /delete <alias_or_session_id>\nUse /sessions to list sessions."
+                    "Usage: /delete <alias_or_ws_id>\nUse /workstreams to list workstreams."
                )
            else:
-                target_id = resolve_session(arg.strip())
+                target_id = resolve_workstream(arg.strip())
                if not target_id:
-                    self.ui.on_info(f"Session not found: {arg.strip()}")
-                elif target_id == self._session_id:
-                    self.ui.on_info("Cannot delete the active session.")
-                elif delete_session(target_id):
-                    self.ui.on_info(f"Deleted session {arg.strip()}")
+                    self.ui.on_info(f"Workstream not found: {arg.strip()}")
+                elif target_id == self._ws_id:
+                    self.ui.on_info("Cannot delete the active workstream.")
+                elif delete_workstream(target_id):
+                    self.ui.on_info(f"Deleted workstream {arg.strip()}")
                else:
-                    self.ui.on_info(f"Failed to delete session {arg.strip()}")
+                    self.ui.on_info(f"Failed to delete workstream {arg.strip()}")

        elif cmd == "/history":
            query = arg.strip() if arg else None
@@ -3110,13 +3106,13 @@ class ChatSession:
                    [
                        "── Slash Commands ─────────────────────────────────────",
                        "  /instructions <text>   Set developer instructions",
-                        "  /clear                 Clear context (session preserved in database)",
-                        "  /new                   Start a new session (old session stays resumable)",
+                        "  /clear                 Clear context (workstream preserved in database)",
+                        "  /new                   Start a new workstream (old one stays resumable)",
                        "",
-                        "  /sessions              List saved sessions",
-                        "  /resume <id|alias>     Resume a previous session",
-                        "  /name <alias>          Name the current session",
-                        "  /delete <id|alias>     Delete a saved session",
+                        "  /workstreams           List saved workstreams",
+                        "  /resume <id|alias>     Resume a previous workstream",
+                        "  /name <alias>          Name the current workstream",
+                        "  /delete <id|alias>     Delete a saved workstream",
                        "",
                        "  /history [query]       Search conversation history (or show recent)",
                        "  /compact               Compact conversation (summarize old messages)",
@@ -16,6 +16,9 @@ def run_migrations(storage: Any, backend: str) -> None:

    For SQLite backends, also handles bootstrapping existing databases
    that were created before the migration system existed.
+
+    For PostgreSQL, acquires an advisory lock so only one process runs
+    migrations at a time (multiple containers share the same database).
    """
    from alembic import command
    from alembic.config import Config
@@ -31,13 +34,32 @@ def run_migrations(storage: Any, backend: str) -> None:
    if backend == "sqlite":
        _bootstrap_existing_sqlite(engine, cfg)

-    try:
-        command.upgrade(cfg, "head")
-    except Exception as exc:
-        if backend == "sqlite":
+    if backend == "postgresql":
+        _run_with_pg_lock(engine, cfg)
+    else:
+        try:
+            command.upgrade(cfg, "head")
+        except Exception as exc:
            log.warning("Migration failed (non-fatal for SQLite): %s", exc)
-        else:
-            raise
+
+
+def _run_with_pg_lock(engine: Any, cfg: Any) -> None:
+    """Run Alembic upgrade under a PostgreSQL advisory lock.
+
+    Advisory lock ID 7_475_283 (arbitrary, derived from 'turnstone').
+    ``pg_advisory_lock`` blocks until the lock is available, so
+    concurrent containers wait in line rather than racing.
+    """
+    import sqlalchemy as sa
+    from alembic import command
+
+    with engine.connect() as conn:
+        conn.execute(sa.text("SELECT pg_advisory_lock(7475283)"))
+        try:
+            command.upgrade(cfg, "head")
+        finally:
+            conn.execute(sa.text("SELECT pg_advisory_unlock(7475283)"))
+            conn.commit()


 def _bootstrap_existing_sqlite(engine: Any, cfg: Any) -> None:
@@ -58,11 +80,14 @@ def _bootstrap_existing_sqlite(engine: Any, cfg: Any) -> None:
        if has_alembic:
            return  # Already managed by Alembic

-        # Check if sessions table exists (indicates pre-existing database)
-        has_sessions = conn.execute(
-            sa.text("SELECT 1 FROM sqlite_master WHERE type='table' AND name='sessions'")
+        # Check if a known table exists (indicates pre-existing database)
+        has_tables = conn.execute(
+            sa.text(
+                "SELECT 1 FROM sqlite_master WHERE type='table' "
+                "AND name IN ('sessions', 'workstreams')"
+            )
        ).fetchone()
-        if has_sessions:
+        if has_tables:
            log.info("Bootstrapping existing database into Alembic (stamping at baseline)")
            command.stamp(cfg, "001")

@@ -13,9 +13,8 @@ from turnstone.core.storage._schema import (
    conversations,
    memories,
    metadata,
-    session_config,
-    sessions,
    users,
+    workstream_config,
    workstreams,
 )
 from turnstone.core.storage._sqlite import _reconstruct_messages
@@ -38,40 +37,11 @@ class PostgreSQLBackend:
        if create_tables:
            metadata.create_all(self._engine)

-    # -- Core session operations -----------------------------------------------
-
-    def register_session(
-        self,
-        session_id: str,
-        title: str | None = None,
-        node_id: str | None = None,
-        ws_id: str | None = None,
-        user_id: str | None = None,
-    ) -> None:
-        now = datetime.now(UTC).strftime("%Y-%m-%dT%H:%M:%S")
-        with self._engine.connect() as conn:
-            # Use dialect-neutral upsert pattern
-            existing = conn.execute(
-                sa.select(sessions.c.session_id).where(sessions.c.session_id == session_id)
-            ).fetchone()
-            if not existing:
-                conn.execute(
-                    sa.insert(sessions),
-                    {
-                        "session_id": session_id,
-                        "title": title,
-                        "node_id": node_id,
-                        "ws_id": ws_id,
-                        "user_id": user_id,
-                        "created": now,
-                        "updated": now,
-                    },
-                )
-            conn.commit()
+    # -- Core conversation operations ------------------------------------------

    def save_message(
        self,
-        session_id: str,
+        ws_id: str,
        role: str,
        content: str | None,
        tool_name: str | None = None,
@@ -84,7 +54,7 @@ class PostgreSQLBackend:
            conn.execute(
                sa.insert(conversations),
                {
-                    "session_id": session_id,
+                    "ws_id": ws_id,
                    "timestamp": now,
                    "role": role,
                    "content": content,
@@ -95,11 +65,11 @@ class PostgreSQLBackend:
                },
            )
            conn.execute(
-                sa.update(sessions).where(sessions.c.session_id == session_id).values(updated=now)
+                sa.update(workstreams).where(workstreams.c.ws_id == ws_id).values(updated=now)
            )
            conn.commit()

-    def load_session_messages(self, session_id: str) -> list[dict[str, Any]]:
+    def load_messages(self, ws_id: str) -> list[dict[str, Any]]:
        with self._engine.connect() as conn:
            rows = conn.execute(
                sa.select(
@@ -110,174 +80,149 @@ class PostgreSQLBackend:
                    conversations.c.tool_call_id,
                    conversations.c.provider_data,
                )
-                .where(conversations.c.session_id == session_id)
+                .where(conversations.c.ws_id == ws_id)
                .order_by(conversations.c.id)
            ).fetchall()
-        return _reconstruct_messages(list(rows), session_id)
+        return _reconstruct_messages(list(rows), ws_id)

-    # -- Session management ----------------------------------------------------
+    # -- Workstream management -------------------------------------------------

-    def list_sessions(self, limit: int = 20) -> list[Any]:
+    def list_workstreams_with_history(self, limit: int = 20) -> list[Any]:
        with self._engine.connect() as conn:
            return list(
                conn.execute(
                    sa.text(
-                        "SELECT s.session_id, s.alias, s.title, s.created, s.updated, "
+                        "SELECT w.ws_id, w.alias, w.title, w.created, w.updated, "
                        "(SELECT COUNT(*) FROM conversations c "
-                        " WHERE c.session_id = s.session_id), "
-                        "s.node_id, s.ws_id "
-                        "FROM sessions s "
+                        " WHERE c.ws_id = w.ws_id), "
+                        "w.node_id "
+                        "FROM workstreams w "
                        "WHERE EXISTS "
-                        "  (SELECT 1 FROM conversations c WHERE c.session_id = s.session_id) "
-                        "ORDER BY s.updated DESC LIMIT :limit"
+                        "  (SELECT 1 FROM conversations c WHERE c.ws_id = w.ws_id) "
+                        "ORDER BY w.updated DESC LIMIT :limit"
                    ),
                    {"limit": limit},
                ).fetchall()
            )

-    def delete_session(self, session_id: str) -> bool:
-        with self._engine.connect() as conn:
-            conn.execute(sa.delete(conversations).where(conversations.c.session_id == session_id))
-            conn.execute(sa.delete(session_config).where(session_config.c.session_id == session_id))
-            conn.execute(sa.delete(sessions).where(sessions.c.session_id == session_id))
-            conn.commit()
-            return True
-
-    def prune_sessions(self, retention_days: int = 90) -> tuple[int, int]:
+    def prune_workstreams(self, retention_days: int = 90) -> tuple[int, int]:
        orphans = stale = 0
        with self._engine.connect() as conn:
-            # 1. Remove sessions with no messages
+            # 1. Remove workstreams with no messages
            orphan_rows = conn.execute(
                sa.text(
-                    "SELECT session_id FROM sessions "
+                    "SELECT ws_id FROM workstreams "
                    "WHERE NOT EXISTS "
                    "  (SELECT 1 FROM conversations c "
-                    "   WHERE c.session_id = sessions.session_id)"
+                    "   WHERE c.ws_id = workstreams.ws_id)"
                )
            ).fetchall()
            orphan_ids = [r[0] for r in orphan_rows]
            if orphan_ids:
                conn.execute(
-                    sa.delete(session_config).where(session_config.c.session_id.in_(orphan_ids))
+                    sa.delete(workstream_config).where(workstream_config.c.ws_id.in_(orphan_ids))
                )
                result = conn.execute(
-                    sa.delete(sessions).where(sessions.c.session_id.in_(orphan_ids))
+                    sa.delete(workstreams).where(workstreams.c.ws_id.in_(orphan_ids))
                )
                orphans = result.rowcount

-            # 2. Remove old unnamed sessions
+            # 2. Remove old unnamed workstreams
            if retention_days > 0:
                cutoff = (datetime.now(UTC) - timedelta(days=retention_days)).strftime(
                    "%Y-%m-%dT%H:%M:%S"
                )
                stale_rows = conn.execute(
-                    sa.select(sessions.c.session_id).where(
-                        sessions.c.alias.is_(None),
-                        sessions.c.updated < cutoff,
+                    sa.select(workstreams.c.ws_id).where(
+                        workstreams.c.alias.is_(None),
+                        workstreams.c.updated < cutoff,
                    )
                ).fetchall()
                stale_ids = [r[0] for r in stale_rows]
                if stale_ids:
                    conn.execute(
-                        sa.delete(session_config).where(session_config.c.session_id.in_(stale_ids))
+                        sa.delete(conversations).where(conversations.c.ws_id.in_(stale_ids))
+                    )
+                    conn.execute(
+                        sa.delete(workstream_config).where(workstream_config.c.ws_id.in_(stale_ids))
                    )
                    result = conn.execute(
-                        sa.delete(sessions).where(sessions.c.session_id.in_(stale_ids))
+                        sa.delete(workstreams).where(workstreams.c.ws_id.in_(stale_ids))
                    )
                    stale = result.rowcount

            conn.commit()
        return (orphans, stale)

-    def resolve_session(self, alias_or_id: str) -> str | None:
+    def resolve_workstream(self, alias_or_id: str) -> str | None:
        with self._engine.connect() as conn:
            # 1. Exact alias
            row = conn.execute(
-                sa.select(sessions.c.session_id).where(sessions.c.alias == alias_or_id)
+                sa.select(workstreams.c.ws_id).where(workstreams.c.alias == alias_or_id)
            ).fetchone()
            if row:
                return str(row[0])
-            # 2. Exact session_id
+            # 2. Exact ws_id
            row = conn.execute(
-                sa.select(sessions.c.session_id).where(sessions.c.session_id == alias_or_id)
+                sa.select(workstreams.c.ws_id).where(workstreams.c.ws_id == alias_or_id)
            ).fetchone()
            if row:
                return str(row[0])
            # 3. Prefix match
            rows = conn.execute(
-                sa.select(sessions.c.session_id).where(
-                    sessions.c.session_id.like(alias_or_id + "%")
-                )
+                sa.select(workstreams.c.ws_id).where(workstreams.c.ws_id.like(alias_or_id + "%"))
            ).fetchall()
            if len(rows) == 1:
                return str(rows[0][0])
-            # 4. Legacy: check conversations
-            row = conn.execute(
-                sa.select(sa.distinct(conversations.c.session_id))
-                .where(conversations.c.session_id == alias_or_id)
-                .limit(1)
-            ).fetchone()
-            if row:
-                now = datetime.now(UTC).strftime("%Y-%m-%dT%H:%M:%S")
-                existing = conn.execute(
-                    sa.select(sessions.c.session_id).where(sessions.c.session_id == row[0])
-                ).fetchone()
-                if not existing:
-                    conn.execute(
-                        sa.insert(sessions),
-                        {"session_id": row[0], "created": now, "updated": now},
-                    )
-                    conn.commit()
-                return str(row[0])
            return None

-    # -- Session config --------------------------------------------------------
+    # -- Workstream config -----------------------------------------------------

-    def save_session_config(self, session_id: str, config: dict[str, str]) -> None:
+    def save_workstream_config(self, ws_id: str, config: dict[str, str]) -> None:
        with self._engine.connect() as conn:
            for key, value in config.items():
                # Upsert: delete + insert
                conn.execute(
-                    sa.delete(session_config).where(
-                        session_config.c.session_id == session_id,
-                        session_config.c.key == key,
+                    sa.delete(workstream_config).where(
+                        workstream_config.c.ws_id == ws_id,
+                        workstream_config.c.key == key,
                    )
                )
                conn.execute(
-                    sa.insert(session_config),
-                    {"session_id": session_id, "key": key, "value": value},
+                    sa.insert(workstream_config),
+                    {"ws_id": ws_id, "key": key, "value": value},
                )
            conn.commit()

-    def load_session_config(self, session_id: str) -> dict[str, str]:
+    def load_workstream_config(self, ws_id: str) -> dict[str, str]:
        with self._engine.connect() as conn:
            rows = conn.execute(
-                sa.select(session_config.c.key, session_config.c.value).where(
-                    session_config.c.session_id == session_id
+                sa.select(workstream_config.c.key, workstream_config.c.value).where(
+                    workstream_config.c.ws_id == ws_id
                )
            ).fetchall()
            return {row[0]: row[1] for row in rows}

-    # -- Session metadata ------------------------------------------------------
+    # -- Workstream metadata ---------------------------------------------------

-    def set_session_alias(self, session_id: str, alias: str) -> bool:
+    def set_workstream_alias(self, ws_id: str, alias: str) -> bool:
        with self._engine.connect() as conn:
            existing = conn.execute(
-                sa.select(sessions.c.session_id).where(sessions.c.alias == alias)
+                sa.select(workstreams.c.ws_id).where(workstreams.c.alias == alias)
            ).fetchone()
-            if existing and existing[0] != session_id:
+            if existing and existing[0] != ws_id:
                return False
            conn.execute(
-                sa.update(sessions).where(sessions.c.session_id == session_id).values(alias=alias)
+                sa.update(workstreams).where(workstreams.c.ws_id == ws_id).values(alias=alias)
            )
            conn.commit()
            return True

-    def get_session_name(self, session_id: str) -> str | None:
+    def get_workstream_display_name(self, ws_id: str) -> str | None:
        with self._engine.connect() as conn:
            row = conn.execute(
-                sa.select(sessions.c.alias, sessions.c.title).where(
-                    sessions.c.session_id == session_id
+                sa.select(workstreams.c.alias, workstreams.c.title).where(
+                    workstreams.c.ws_id == ws_id
                )
            ).fetchone()
            if row:
@@ -285,10 +230,10 @@ class PostgreSQLBackend:
                return str(value) if value is not None else None
        return None

-    def update_session_title(self, session_id: str, title: str) -> None:
+    def update_workstream_title(self, ws_id: str, title: str) -> None:
        with self._engine.connect() as conn:
            conn.execute(
-                sa.update(sessions).where(sessions.c.session_id == session_id).values(title=title)
+                sa.update(workstreams).where(workstreams.c.ws_id == ws_id).values(title=title)
            )
            conn.commit()

@@ -359,6 +304,8 @@ class PostgreSQLBackend:
        name: str = "",
        state: str = "idle",
        user_id: str | None = None,
+        alias: str | None = None,
+        title: str | None = None,
    ) -> None:
        now = datetime.now(UTC).strftime("%Y-%m-%dT%H:%M:%S")
        with self._engine.connect() as conn:
@@ -374,6 +321,8 @@ class PostgreSQLBackend:
                        "user_id": user_id,
                        "name": name,
                        "state": state,
+                        "alias": alias,
+                        "title": title,
                        "created": now,
                        "updated": now,
                    },
@@ -402,6 +351,8 @@ class PostgreSQLBackend:

    def delete_workstream(self, ws_id: str) -> bool:
        with self._engine.connect() as conn:
+            conn.execute(sa.delete(conversations).where(conversations.c.ws_id == ws_id))
+            conn.execute(sa.delete(workstream_config).where(workstream_config.c.ws_id == ws_id))
            result = conn.execute(sa.delete(workstreams).where(workstreams.c.ws_id == ws_id))
            conn.commit()
            return result.rowcount > 0
@@ -436,7 +387,7 @@ class PostgreSQLBackend:
                return list(
                    conn.execute(
                        sa.text(
-                            "SELECT c.timestamp, c.session_id, c.role, c.content, c.tool_name "
+                            "SELECT c.timestamp, c.ws_id, c.role, c.content, c.tool_name "
                            "FROM conversations c "
                            "WHERE to_tsvector('english', COALESCE(c.content, '')) "
                            "   @@ plainto_tsquery('english', :query) "
@@ -452,7 +403,7 @@ class PostgreSQLBackend:
                return list(
                    conn.execute(
                        sa.text(
-                            "SELECT timestamp, session_id, role, content, tool_name "
+                            "SELECT timestamp, ws_id, role, content, tool_name "
                            "FROM conversations WHERE content ILIKE :pattern "
                            "ORDER BY timestamp DESC LIMIT :limit"
                        ),
@@ -466,22 +417,13 @@ class PostgreSQLBackend:
            return list(
                conn.execute(
                    sa.text(
-                        "SELECT timestamp, session_id, role, content, tool_name "
+                        "SELECT timestamp, ws_id, role, content, tool_name "
                        "FROM conversations ORDER BY timestamp DESC LIMIT :limit"
                    ),
                    {"limit": capped},
                ).fetchall()
            )

-    # -- Session lookup by workstream ------------------------------------------
-
-    def get_session_id_by_ws(self, ws_id: str) -> str | None:
-        with self._engine.connect() as conn:
-            row = conn.execute(
-                sa.select(sessions.c.session_id).where(sessions.c.ws_id == ws_id)
-            ).fetchone()
-            return str(row[0]) if row else None
-
    # -- User identity operations -----------------------------------------------

    def create_user(
@@ -9,26 +9,15 @@ from typing import Any, Protocol, runtime_checkable
 class StorageBackend(Protocol):
    """Protocol that every storage backend adapter must implement.

-    Provides session management, conversation persistence, key-value storage
+    Provides workstream management, conversation persistence, key-value storage
    (for memories), and full-text search.
    """

-    # -- Core session operations -----------------------------------------------
-
-    def register_session(
-        self,
-        session_id: str,
-        title: str | None = None,
-        node_id: str | None = None,
-        ws_id: str | None = None,
-        user_id: str | None = None,
-    ) -> None:
-        """Create a sessions row for a new session (no-op if already exists)."""
-        ...
+    # -- Core conversation operations ------------------------------------------

    def save_message(
        self,
-        session_id: str,
+        ws_id: str,
        role: str,
        content: str | None,
        tool_name: str | None = None,
@@ -39,50 +28,46 @@ class StorageBackend(Protocol):
        """Log a message to the conversations table."""
        ...

-    def load_session_messages(self, session_id: str) -> list[dict[str, Any]]:
-        """Load messages for a session and reconstruct OpenAI message format."""
+    def load_messages(self, ws_id: str) -> list[dict[str, Any]]:
+        """Load messages for a workstream and reconstruct OpenAI message format."""
        ...

-    # -- Session management ----------------------------------------------------
+    # -- Workstream management -------------------------------------------------

-    def list_sessions(self, limit: int = 20) -> list[Any]:
-        """List recent sessions with message counts, ordered by updated DESC."""
+    def list_workstreams_with_history(self, limit: int = 20) -> list[Any]:
+        """List workstreams that have messages, ordered by updated DESC."""
        ...

-    def delete_session(self, session_id: str) -> bool:
-        """Delete a session and all its messages. Returns True on success."""
+    def prune_workstreams(self, retention_days: int = 90) -> tuple[int, int]:
+        """Remove orphaned + stale unnamed workstreams. Returns (orphans, stale)."""
        ...

-    def prune_sessions(self, retention_days: int = 90) -> tuple[int, int]:
-        """Remove orphaned + stale unnamed sessions. Returns (orphans, stale)."""
+    def resolve_workstream(self, alias_or_id: str) -> str | None:
+        """Resolve an alias or ws_id (or prefix) to a full ws_id."""
        ...

-    def resolve_session(self, alias_or_id: str) -> str | None:
-        """Resolve an alias or session_id (or prefix) to a full session_id."""
+    # -- Workstream config -----------------------------------------------------
+
+    def save_workstream_config(self, ws_id: str, config: dict[str, str]) -> None:
+        """Persist workstream configuration key/value pairs."""
        ...

-    # -- Session config --------------------------------------------------------
-
-    def save_session_config(self, session_id: str, config: dict[str, str]) -> None:
-        """Persist session configuration key/value pairs."""
+    def load_workstream_config(self, ws_id: str) -> dict[str, str]:
+        """Load workstream configuration. Returns empty dict if none stored."""
        ...

-    def load_session_config(self, session_id: str) -> dict[str, str]:
-        """Load session configuration. Returns empty dict if none stored."""
-        ...
+    # -- Workstream metadata ---------------------------------------------------

-    # -- Session metadata ------------------------------------------------------
-
-    def set_session_alias(self, session_id: str, alias: str) -> bool:
+    def set_workstream_alias(self, ws_id: str, alias: str) -> bool:
        """Set a human-friendly alias. Returns False if alias is taken."""
        ...

-    def get_session_name(self, session_id: str) -> str | None:
-        """Return the alias (or title) for a session, or None if unset."""
+    def get_workstream_display_name(self, ws_id: str) -> str | None:
+        """Return the alias (or title) for a workstream, or None if unset."""
        ...

-    def update_session_title(self, session_id: str, title: str) -> None:
-        """Set or update the auto-generated title for a session."""
+    def update_workstream_title(self, ws_id: str, title: str) -> None:
+        """Set or update the auto-generated title for a workstream."""
        ...

    # -- Generic key-value store (backs memories table) ------------------------
@@ -116,6 +101,8 @@ class StorageBackend(Protocol):
        name: str = "",
        state: str = "idle",
        user_id: str | None = None,
+        alias: str | None = None,
+        title: str | None = None,
    ) -> None:
        """Create a workstreams row (no-op if already exists)."""
        ...
@@ -129,7 +116,7 @@ class StorageBackend(Protocol):
        ...

    def delete_workstream(self, ws_id: str) -> bool:
-        """Delete a workstream. Returns True on success."""
+        """Delete a workstream and all its conversations + config."""
        ...

    def list_workstreams(self, node_id: str | None = None, limit: int = 100) -> list[Any]:
@@ -139,7 +126,7 @@ class StorageBackend(Protocol):
    # -- Conversation search ---------------------------------------------------

    def search_history(self, query: str, limit: int = 20) -> list[Any]:
-        """Search conversation history. Returns (timestamp, session_id, role, content, tool_name)."""
+        """Search conversation history. Returns (timestamp, ws_id, role, content, tool_name)."""
        ...

    def search_history_recent(self, limit: int = 20) -> list[Any]:
@@ -219,12 +206,6 @@ class StorageBackend(Protocol):
        """Remove a channel user mapping. Returns True if existed."""
        ...

-    # -- Session lookup by workstream ------------------------------------------
-
-    def get_session_id_by_ws(self, ws_id: str) -> str | None:
-        """Find the session_id associated with a workstream. Returns None if not found."""
-        ...
-
    # -- Channel routing -------------------------------------------------------

    def create_channel_route(
@@ -22,7 +22,7 @@ conversations = sa.Table(
    "conversations",
    metadata,
    sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
-    sa.Column("session_id", sa.Text, nullable=False, index=True),
+    sa.Column("ws_id", sa.Text, nullable=False, index=True),
    sa.Column("timestamp", sa.Text, nullable=False),
    sa.Column("role", sa.Text, nullable=False),
    sa.Column("content", sa.Text),
@@ -32,32 +32,14 @@ conversations = sa.Table(
    sa.Column("provider_data", sa.Text),
 )

-sessions = sa.Table(
-    "sessions",
-    metadata,
-    sa.Column("session_id", sa.Text, primary_key=True),
-    sa.Column("alias", sa.Text, unique=True),
-    sa.Column("title", sa.Text),
-    sa.Column("node_id", sa.Text),
-    sa.Column("ws_id", sa.Text),
-    sa.Column("user_id", sa.Text),
-    sa.Column("created", sa.Text, nullable=False),
-    sa.Column("updated", sa.Text, nullable=False),
-)
-
-# Additional indexes on sessions (name-based to avoid duplication with SA's auto-index)
-sa.Index("idx_sessions_alias", sessions.c.alias)
-sa.Index("idx_sessions_updated", sessions.c.updated)
-sa.Index("idx_sessions_node_id", sessions.c.node_id)
-sa.Index("idx_sessions_ws_id", sessions.c.ws_id)
-sa.Index("idx_sessions_user_id", sessions.c.user_id)
-
 workstreams = sa.Table(
    "workstreams",
    metadata,
    sa.Column("ws_id", sa.Text, primary_key=True),
    sa.Column("node_id", sa.Text),
    sa.Column("user_id", sa.Text),
+    sa.Column("alias", sa.Text, unique=True),
+    sa.Column("title", sa.Text),
    sa.Column("name", sa.Text, nullable=False, server_default=""),
    sa.Column("state", sa.Text, nullable=False, server_default="idle"),
    sa.Column("created", sa.Text, nullable=False),
@@ -67,14 +49,15 @@ workstreams = sa.Table(
 sa.Index("idx_workstreams_node_id", workstreams.c.node_id)
 sa.Index("idx_workstreams_state", workstreams.c.state)
 sa.Index("idx_workstreams_user_id", workstreams.c.user_id)
+sa.Index("idx_workstreams_alias", workstreams.c.alias)

-session_config = sa.Table(
-    "session_config",
+workstream_config = sa.Table(
+    "workstream_config",
    metadata,
-    sa.Column("session_id", sa.Text, nullable=False),
+    sa.Column("ws_id", sa.Text, nullable=False),
    sa.Column("key", sa.Text, nullable=False),
    sa.Column("value", sa.Text),
-    sa.PrimaryKeyConstraint("session_id", "key"),
+    sa.PrimaryKeyConstraint("ws_id", "key"),
 )

 # ---------------------------------------------------------------------------
@@ -15,9 +15,8 @@ from turnstone.core.storage._schema import (
    conversations,
    memories,
    metadata,
-    session_config,
-    sessions,
    users,
+    workstream_config,
    workstreams,
 )

@@ -82,35 +81,11 @@ class SQLiteBackend:
            except Exception:
                self._fts5_available = False

-    # -- Core session operations -----------------------------------------------
-
-    def register_session(
-        self,
-        session_id: str,
-        title: str | None = None,
-        node_id: str | None = None,
-        ws_id: str | None = None,
-        user_id: str | None = None,
-    ) -> None:
-        now = datetime.now(UTC).strftime("%Y-%m-%dT%H:%M:%S")
-        with self._engine.connect() as conn:
-            conn.execute(
-                sa.insert(sessions).prefix_with("OR IGNORE"),
-                {
-                    "session_id": session_id,
-                    "title": title,
-                    "node_id": node_id,
-                    "ws_id": ws_id,
-                    "user_id": user_id,
-                    "created": now,
-                    "updated": now,
-                },
-            )
-            conn.commit()
+    # -- Core conversation operations ------------------------------------------

    def save_message(
        self,
-        session_id: str,
+        ws_id: str,
        role: str,
        content: str | None,
        tool_name: str | None = None,
@@ -123,7 +98,7 @@ class SQLiteBackend:
            result = conn.execute(
                sa.insert(conversations),
                {
-                    "session_id": session_id,
+                    "ws_id": ws_id,
                    "timestamp": now,
                    "role": role,
                    "content": content,
@@ -145,13 +120,13 @@ class SQLiteBackend:
                    )
                except Exception:
                    self._fts5_available = False
-            # Bump session updated timestamp
+            # Bump workstream updated timestamp
            conn.execute(
-                sa.update(sessions).where(sessions.c.session_id == session_id).values(updated=now)
+                sa.update(workstreams).where(workstreams.c.ws_id == ws_id).values(updated=now)
            )
            conn.commit()

-    def load_session_messages(self, session_id: str) -> list[dict[str, Any]]:
+    def load_messages(self, ws_id: str) -> list[dict[str, Any]]:
        with self._engine.connect() as conn:
            rows = conn.execute(
                sa.select(
@@ -162,52 +137,44 @@ class SQLiteBackend:
                    conversations.c.tool_call_id,
                    conversations.c.provider_data,
                )
-                .where(conversations.c.session_id == session_id)
+                .where(conversations.c.ws_id == ws_id)
                .order_by(conversations.c.id)
            ).fetchall()

-        return _reconstruct_messages(list(rows), session_id)
+        return _reconstruct_messages(list(rows), ws_id)

-    # -- Session management ----------------------------------------------------
+    # -- Workstream management -------------------------------------------------

-    def list_sessions(self, limit: int = 20) -> list[Any]:
+    def list_workstreams_with_history(self, limit: int = 20) -> list[Any]:
        with self._engine.connect() as conn:
            return list(
                conn.execute(
                    sa.text(
-                        "SELECT s.session_id, s.alias, s.title, s.created, s.updated, "
+                        "SELECT w.ws_id, w.alias, w.title, w.created, w.updated, "
                        "(SELECT COUNT(*) FROM conversations c "
-                        " WHERE c.session_id = s.session_id), "
-                        "s.node_id, s.ws_id "
-                        "FROM sessions s "
+                        " WHERE c.ws_id = w.ws_id), "
+                        "w.node_id "
+                        "FROM workstreams w "
                        "WHERE EXISTS "
-                        "  (SELECT 1 FROM conversations c WHERE c.session_id = s.session_id) "
-                        "ORDER BY s.updated DESC LIMIT :limit"
+                        "  (SELECT 1 FROM conversations c WHERE c.ws_id = w.ws_id) "
+                        "ORDER BY w.updated DESC LIMIT :limit"
                    ),
                    {"limit": limit},
                ).fetchall()
            )

-    def delete_session(self, session_id: str) -> bool:
-        with self._engine.connect() as conn:
-            conn.execute(sa.delete(conversations).where(conversations.c.session_id == session_id))
-            conn.execute(sa.delete(session_config).where(session_config.c.session_id == session_id))
-            conn.execute(sa.delete(sessions).where(sessions.c.session_id == session_id))
-            conn.commit()
-            return True
-
-    def prune_sessions(self, retention_days: int = 90) -> tuple[int, int]:
+    def prune_workstreams(self, retention_days: int = 90) -> tuple[int, int]:
        orphans = stale = 0
        with self._engine.connect() as conn:
-            # 1. Remove sessions with no messages
+            # 1. Remove workstreams with no messages
            orphan_ids = [
                row[0]
                for row in conn.execute(
                    sa.text(
-                        "SELECT session_id FROM sessions "
+                        "SELECT ws_id FROM workstreams "
                        "WHERE NOT EXISTS "
                        "  (SELECT 1 FROM conversations c "
-                        "   WHERE c.session_id = sessions.session_id)"
+                        "   WHERE c.ws_id = workstreams.ws_id)"
                    )
                ).fetchall()
            ]
@@ -215,16 +182,16 @@ class SQLiteBackend:
                placeholders = ",".join([":p" + str(i) for i in range(len(orphan_ids))])
                params = {f"p{i}": oid for i, oid in enumerate(orphan_ids)}
                conn.execute(
-                    sa.text(f"DELETE FROM session_config WHERE session_id IN ({placeholders})"),
+                    sa.text(f"DELETE FROM workstream_config WHERE ws_id IN ({placeholders})"),
                    params,
                )
                result = conn.execute(
-                    sa.text(f"DELETE FROM sessions WHERE session_id IN ({placeholders})"),
+                    sa.text(f"DELETE FROM workstreams WHERE ws_id IN ({placeholders})"),
                    params,
                )
                orphans = result.rowcount

-            # 2. Remove old unnamed sessions
+            # 2. Remove old unnamed workstreams
            if retention_days > 0:
                cutoff = (datetime.now(UTC) - timedelta(days=retention_days)).strftime(
                    "%Y-%m-%dT%H:%M:%S"
@@ -233,7 +200,7 @@ class SQLiteBackend:
                    row[0]
                    for row in conn.execute(
                        sa.text(
-                            "SELECT session_id FROM sessions "
+                            "SELECT ws_id FROM workstreams "
                            "WHERE alias IS NULL AND updated < :cutoff"
                        ),
                        {"cutoff": cutoff},
@@ -243,11 +210,15 @@ class SQLiteBackend:
                    placeholders = ",".join([":p" + str(i) for i in range(len(stale_ids))])
                    params = {f"p{i}": sid for i, sid in enumerate(stale_ids)}
                    conn.execute(
-                        sa.text(f"DELETE FROM session_config WHERE session_id IN ({placeholders})"),
+                        sa.text(f"DELETE FROM workstream_config WHERE ws_id IN ({placeholders})"),
+                        params,
+                    )
+                    conn.execute(
+                        sa.text(f"DELETE FROM conversations WHERE ws_id IN ({placeholders})"),
                        params,
                    )
                    result = conn.execute(
-                        sa.text(f"DELETE FROM sessions WHERE session_id IN ({placeholders})"),
+                        sa.text(f"DELETE FROM workstreams WHERE ws_id IN ({placeholders})"),
                        params,
                    )
                    stale = result.rowcount
@@ -255,94 +226,71 @@ class SQLiteBackend:
            conn.commit()
        return (orphans, stale)

-    def resolve_session(self, alias_or_id: str) -> str | None:
+    def resolve_workstream(self, alias_or_id: str) -> str | None:
        with self._engine.connect() as conn:
            # 1. Exact alias match
            row = conn.execute(
-                sa.select(sessions.c.session_id).where(sessions.c.alias == alias_or_id)
+                sa.select(workstreams.c.ws_id).where(workstreams.c.alias == alias_or_id)
            ).fetchone()
            if row:
                return str(row[0])
-            # 2. Exact session_id match
+            # 2. Exact ws_id match
            row = conn.execute(
-                sa.select(sessions.c.session_id).where(sessions.c.session_id == alias_or_id)
+                sa.select(workstreams.c.ws_id).where(workstreams.c.ws_id == alias_or_id)
            ).fetchone()
            if row:
                return str(row[0])
-            # 3. Session_id prefix match
+            # 3. ws_id prefix match
            rows = conn.execute(
-                sa.select(sessions.c.session_id).where(
-                    sessions.c.session_id.like(alias_or_id + "%")
-                )
+                sa.select(workstreams.c.ws_id).where(workstreams.c.ws_id.like(alias_or_id + "%"))
            ).fetchall()
            if len(rows) == 1:
                return str(rows[0][0])
-            # 4. Legacy: check conversations table
-            row = conn.execute(
-                sa.text(
-                    "SELECT DISTINCT session_id FROM conversations WHERE session_id = :sid LIMIT 1"
-                ),
-                {"sid": alias_or_id},
-            ).fetchone()
-            if row:
-                # Auto-register legacy session
-                conn.execute(
-                    sa.text(
-                        "INSERT OR IGNORE INTO sessions "
-                        "(session_id, created, updated) VALUES ("
-                        ":sid, "
-                        "(SELECT MIN(timestamp) FROM conversations WHERE session_id = :sid), "
-                        "(SELECT MAX(timestamp) FROM conversations WHERE session_id = :sid))"
-                    ),
-                    {"sid": row[0]},
-                )
-                conn.commit()
-                return str(row[0])
            return None

-    # -- Session config --------------------------------------------------------
+    # -- Workstream config -----------------------------------------------------

-    def save_session_config(self, session_id: str, config: dict[str, str]) -> None:
+    def save_workstream_config(self, ws_id: str, config: dict[str, str]) -> None:
        with self._engine.connect() as conn:
            for key, value in config.items():
                conn.execute(
                    sa.text(
-                        "INSERT OR REPLACE INTO session_config "
-                        "(session_id, key, value) VALUES (:sid, :key, :value)"
+                        "INSERT OR REPLACE INTO workstream_config "
+                        "(ws_id, key, value) VALUES (:wid, :key, :value)"
                    ),
-                    {"sid": session_id, "key": key, "value": value},
+                    {"wid": ws_id, "key": key, "value": value},
                )
            conn.commit()

-    def load_session_config(self, session_id: str) -> dict[str, str]:
+    def load_workstream_config(self, ws_id: str) -> dict[str, str]:
        with self._engine.connect() as conn:
            rows = conn.execute(
-                sa.select(session_config.c.key, session_config.c.value).where(
-                    session_config.c.session_id == session_id
+                sa.select(workstream_config.c.key, workstream_config.c.value).where(
+                    workstream_config.c.ws_id == ws_id
                )
            ).fetchall()
            return {row[0]: row[1] for row in rows}

-    # -- Session metadata ------------------------------------------------------
+    # -- Workstream metadata ---------------------------------------------------

-    def set_session_alias(self, session_id: str, alias: str) -> bool:
+    def set_workstream_alias(self, ws_id: str, alias: str) -> bool:
        with self._engine.connect() as conn:
            existing = conn.execute(
-                sa.select(sessions.c.session_id).where(sessions.c.alias == alias)
+                sa.select(workstreams.c.ws_id).where(workstreams.c.alias == alias)
            ).fetchone()
-            if existing and existing[0] != session_id:
+            if existing and existing[0] != ws_id:
                return False
            conn.execute(
-                sa.update(sessions).where(sessions.c.session_id == session_id).values(alias=alias)
+                sa.update(workstreams).where(workstreams.c.ws_id == ws_id).values(alias=alias)
            )
            conn.commit()
            return True

-    def get_session_name(self, session_id: str) -> str | None:
+    def get_workstream_display_name(self, ws_id: str) -> str | None:
        with self._engine.connect() as conn:
            row = conn.execute(
-                sa.select(sessions.c.alias, sessions.c.title).where(
-                    sessions.c.session_id == session_id
+                sa.select(workstreams.c.alias, workstreams.c.title).where(
+                    workstreams.c.ws_id == ws_id
                )
            ).fetchone()
            if row:
@@ -350,10 +298,10 @@ class SQLiteBackend:
                return str(value) if value is not None else None
        return None

-    def update_session_title(self, session_id: str, title: str) -> None:
+    def update_workstream_title(self, ws_id: str, title: str) -> None:
        with self._engine.connect() as conn:
            conn.execute(
-                sa.update(sessions).where(sessions.c.session_id == session_id).values(title=title)
+                sa.update(workstreams).where(workstreams.c.ws_id == ws_id).values(title=title)
            )
            conn.commit()

@@ -428,6 +376,8 @@ class SQLiteBackend:
        name: str = "",
        state: str = "idle",
        user_id: str | None = None,
+        alias: str | None = None,
+        title: str | None = None,
    ) -> None:
        now = datetime.now(UTC).strftime("%Y-%m-%dT%H:%M:%S")
        with self._engine.connect() as conn:
@@ -437,6 +387,8 @@ class SQLiteBackend:
                    "ws_id": ws_id,
                    "node_id": node_id,
                    "user_id": user_id,
+                    "alias": alias,
+                    "title": title,
                    "name": name,
                    "state": state,
                    "created": now,
@@ -467,6 +419,8 @@ class SQLiteBackend:

    def delete_workstream(self, ws_id: str) -> bool:
        with self._engine.connect() as conn:
+            conn.execute(sa.delete(conversations).where(conversations.c.ws_id == ws_id))
+            conn.execute(sa.delete(workstream_config).where(workstream_config.c.ws_id == ws_id))
            result = conn.execute(sa.delete(workstreams).where(workstreams.c.ws_id == ws_id))
            conn.commit()
            return result.rowcount > 0
@@ -500,7 +454,7 @@ class SQLiteBackend:
                return list(
                    conn.execute(
                        sa.text(
-                            "SELECT c.timestamp, c.session_id, c.role, c.content, c.tool_name "
+                            "SELECT c.timestamp, c.ws_id, c.role, c.content, c.tool_name "
                            "FROM conversations_fts f "
                            "JOIN conversations c ON c.id = f.rowid "
                            "WHERE conversations_fts MATCH :query "
@@ -512,7 +466,7 @@ class SQLiteBackend:
            return list(
                conn.execute(
                    sa.text(
-                        "SELECT timestamp, session_id, role, content, tool_name "
+                        "SELECT timestamp, ws_id, role, content, tool_name "
                        "FROM conversations WHERE content LIKE :pattern ESCAPE '\\' "
                        "ORDER BY timestamp DESC LIMIT :limit"
                    ),
@@ -526,7 +480,7 @@ class SQLiteBackend:
            return list(
                conn.execute(
                    sa.text(
-                        "SELECT timestamp, session_id, role, content, tool_name "
+                        "SELECT timestamp, ws_id, role, content, tool_name "
                        "FROM conversations ORDER BY timestamp DESC LIMIT :limit"
                    ),
                    {"limit": capped},
@@ -732,15 +686,6 @@ class SQLiteBackend:
            conn.commit()
            return result.rowcount > 0

-    # -- Session lookup by workstream ------------------------------------------
-
-    def get_session_id_by_ws(self, ws_id: str) -> str | None:
-        with self._engine.connect() as conn:
-            row = conn.execute(
-                sa.select(sessions.c.session_id).where(sessions.c.ws_id == ws_id)
-            ).fetchone()
-            return str(row[0]) if row else None
-
    # -- Channel user mapping ---------------------------------------------------

    def create_channel_user(self, channel_type: str, channel_user_id: str, user_id: str) -> None:
@@ -1195,7 +1140,7 @@ class SQLiteBackend:
        self._engine.dispose()


-def _reconstruct_messages(rows: list[Any], session_id: str) -> list[dict[str, Any]]:
+def _reconstruct_messages(rows: list[Any], ws_id: str) -> list[dict[str, Any]]:
    """Reconstruct OpenAI message format from stored conversation rows.

    Handles tool_call / tool_result grouping and incomplete turn repair.
@@ -1233,7 +1178,7 @@ def _reconstruct_messages(rows: list[Any], session_id: str) -> list[dict[str, An

            while i < len(rows) and rows[i][0] == "tool_call":
                _, _, tn, ta, stored_tc_id, _ = rows[i]
-                call_id = stored_tc_id or f"call_{session_id}_{i}"
+                call_id = stored_tc_id or f"call_{ws_id}_{i}"
                assistant_msg["tool_calls"].append(
                    {
                        "id": call_id,
@@ -0,0 +1,131 @@
+"""Normalize session_id into ws_id — merge sessions table into workstreams.
+
+Conversations and config are now keyed by ws_id (workstream identity) instead
+of a separate session_id.  The sessions table is dropped; its alias/title
+columns move to workstreams.
+
+Revision ID: 006
+Revises: 005
+Create Date: 2026-03-07
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "006"
+down_revision = "005"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # 1. Add alias and title columns to workstreams.
+    op.add_column("workstreams", sa.Column("alias", sa.Text))
+    op.add_column("workstreams", sa.Column("title", sa.Text))
+    op.create_index("idx_workstreams_alias", "workstreams", ["alias"], unique=True)
+
+    conn = op.get_bind()
+
+    # 2. Copy alias/title from sessions → workstreams (for rows that have a ws_id).
+    conn.execute(
+        sa.text(
+            "UPDATE workstreams SET "
+            "  alias = (SELECT s.alias FROM sessions s WHERE s.ws_id = workstreams.ws_id), "
+            "  title = (SELECT s.title FROM sessions s WHERE s.ws_id = workstreams.ws_id) "
+            "WHERE EXISTS (SELECT 1 FROM sessions s WHERE s.ws_id = workstreams.ws_id)"
+        )
+    )
+
+    # 3. Create workstream rows for sessions that have a ws_id but no
+    #    corresponding workstream row yet.
+    #    The NOT EXISTS guard makes this safe on both SQLite and PostgreSQL.
+    conn.execute(
+        sa.text(
+            "INSERT INTO workstreams "
+            "(ws_id, node_id, alias, title, state, created, updated) "
+            "SELECT s.ws_id, s.node_id, s.alias, s.title, 'closed', s.created, s.updated "
+            "FROM sessions s "
+            "WHERE s.ws_id IS NOT NULL AND s.ws_id != '' "
+            "  AND NOT EXISTS (SELECT 1 FROM workstreams w WHERE w.ws_id = s.ws_id)"
+        )
+    )
+
+    # 4. Create workstream rows for sessions WITHOUT a ws_id
+    #    (use session_id as ws_id).
+    conn.execute(
+        sa.text(
+            "INSERT INTO workstreams "
+            "(ws_id, node_id, alias, title, state, created, updated) "
+            "SELECT s.session_id, s.node_id, s.alias, s.title, 'closed', s.created, s.updated "
+            "FROM sessions s "
+            "WHERE (s.ws_id IS NULL OR s.ws_id = '') "
+            "  AND NOT EXISTS (SELECT 1 FROM workstreams w WHERE w.ws_id = s.session_id)"
+        )
+    )
+
+    # 5. Rename conversations.session_id → conversations.ws_id and remap values.
+    #    For sessions with ws_id: map session_id → ws_id.
+    #    For sessions without ws_id: session_id stays (used as ws_id).
+    op.alter_column("conversations", "session_id", new_column_name="ws_id")
+
+    conn.execute(
+        sa.text(
+            "UPDATE conversations SET ws_id = ("
+            "  SELECT COALESCE(NULLIF(s.ws_id, ''), s.session_id) "
+            "  FROM sessions s WHERE s.session_id = conversations.ws_id"
+            ") "
+            "WHERE EXISTS ("
+            "  SELECT 1 FROM sessions s WHERE s.session_id = conversations.ws_id"
+            ")"
+        )
+    )
+
+    # 6. Rename session_config → workstream_config with ws_id column.
+    op.rename_table("session_config", "workstream_config")
+    op.alter_column("workstream_config", "session_id", new_column_name="ws_id")
+
+    conn.execute(
+        sa.text(
+            "UPDATE workstream_config SET ws_id = ("
+            "  SELECT COALESCE(NULLIF(s.ws_id, ''), s.session_id) "
+            "  FROM sessions s WHERE s.session_id = workstream_config.ws_id"
+            ") "
+            "WHERE EXISTS ("
+            "  SELECT 1 FROM sessions s WHERE s.session_id = workstream_config.ws_id"
+            ")"
+        )
+    )
+
+    # 7. Drop the sessions table.
+    op.drop_table("sessions")
+
+
+def downgrade() -> None:
+    # Recreate the sessions table.
+    op.create_table(
+        "sessions",
+        sa.Column("session_id", sa.Text, primary_key=True),
+        sa.Column("alias", sa.Text, unique=True),
+        sa.Column("title", sa.Text),
+        sa.Column("node_id", sa.Text),
+        sa.Column("ws_id", sa.Text),
+        sa.Column("user_id", sa.Text),
+        sa.Column("created", sa.Text, nullable=False),
+        sa.Column("updated", sa.Text, nullable=False),
+    )
+    op.create_index("idx_sessions_alias", "sessions", ["alias"])
+    op.create_index("idx_sessions_updated", "sessions", ["updated"])
+    op.create_index("idx_sessions_node_id", "sessions", ["node_id"])
+    op.create_index("idx_sessions_ws_id", "sessions", ["ws_id"])
+
+    # Reverse config table rename.
+    op.alter_column("workstream_config", "ws_id", new_column_name="session_id")
+    op.rename_table("workstream_config", "session_config")
+
+    # Reverse conversations column rename.
+    op.alter_column("conversations", "ws_id", new_column_name="session_id")
+
+    # Drop alias/title from workstreams.
+    op.drop_index("idx_workstreams_alias", "workstreams")
+    op.drop_column("workstreams", "title")
+    op.drop_column("workstreams", "alias")
@@ -1,4 +1,4 @@
-"""Workstream manager — concurrent independent chat sessions.
+"""Workstream manager — concurrent independent conversations.

 A workstream is an independent conversation with its own ChatSession and UI
 adapter.  The WorkstreamManager coordinates multiple workstreams, tracks their
@@ -74,9 +74,10 @@ class WorkstreamManager:
        Args:
            session_factory: callable(ui, model_alias, ws_id) -> ChatSession.
                Captures shared config (registry, temperature, …) so the
-                manager can create sessions without knowing those details.
-                *model_alias* selects a model from the registry (None = default).
-                *ws_id* links the session to its workstream in storage.
+                manager can create ChatSession instances without knowing
+                those details.  *model_alias* selects a model from the
+                registry (None = default).  *ws_id* is the persistent
+                identity used for all storage operations.
            max_workstreams: Maximum number of concurrent workstreams.  When at
                capacity, ``create()`` will auto-evict the oldest IDLE
                workstream before raising.
@@ -125,7 +126,7 @@ class WorkstreamManager:
            model: Optional model alias from the registry.  ``None`` uses the
                default model.
        """
-        # Fast-fail capacity check (avoids expensive session creation when full).
+        # Fast-fail capacity check (avoids expensive ChatSession creation when full).
        first_evicted: Workstream | None = None
        with self._lock:
            if len(self._workstreams) >= self._max_workstreams:
@@ -141,7 +142,7 @@ class WorkstreamManager:

            _m1.record_eviction()

-        # Create workstream and session outside the lock (session creation is
+        # Create workstream and ChatSession outside the lock (construction is
        # expensive — involves LLM client setup and DB writes).
        ws = Workstream(name=name)
        if ui_factory:
@@ -34,7 +34,6 @@ from turnstone.mq.protocol import (
    OutboundEvent,
    PlanReviewEvent,
    ReasoningEvent,
-    SessionResumedEvent,
    StateChangeEvent,
    StatusEvent,
    StreamEndEvent,
@@ -46,6 +45,7 @@ from turnstone.mq.protocol import (
    WorkstreamCreatedEvent,
    WorkstreamListEvent,
    WorkstreamRenameEvent,
+    WorkstreamResumedEvent,
 )

 if TYPE_CHECKING:
@@ -361,7 +361,7 @@ class Bridge:
        auto_approve_tools = getattr(msg, "auto_approve_tools", [])
        model = getattr(msg, "model", "")
        initial_message = getattr(msg, "initial_message", "")
-        resume_session = getattr(msg, "resume_session", "")
+        resume_ws = getattr(msg, "resume_ws", "")
        user_id = getattr(msg, "user_id", "")
        if user_id:
            log.info("bridge.create_ws user_id=%s name=%s model=%s", user_id, name, model)
@@ -371,11 +371,11 @@ class Bridge:
            auto_approve_tools=auto_approve_tools,
            correlation_id=msg.correlation_id,
            model=model,
-            resume_session=resume_session,
+            resume_ws=resume_ws,
        )
-        # Send initial_message only when no session was actually resumed.
+        # Send initial_message only when no workstream was actually resumed.
        # Use the server's `resumed` response (not just the intent) so that
-        # a pruned/missing session falls back to sending the initial message.
+        # a pruned/missing workstream falls back to sending the initial message.
        if ws_id and initial_message and not resumed:
            # Track the send so the global SSE handler emits TurnCompleteEvent
            # when the workstream returns to idle.
@@ -438,15 +438,15 @@ class Bridge:
        auto_approve_tools: list[str],
        correlation_id: str,
        model: str = "",
-        resume_session: str = "",
+        resume_ws: str = "",
    ) -> tuple[str, bool]:
        """Create a workstream on the server.  Returns (ws_id, resumed)."""
        try:
            payload: dict[str, Any] = {"name": name, "auto_approve": auto_approve}
            if model:
                payload["model"] = model
-            if resume_session:
-                payload["resume_session"] = resume_session
+            if resume_ws:
+                payload["resume_ws"] = resume_ws
            resp = self._http.post(
                "/v1/api/workstreams/new",
                json=payload,
@@ -475,15 +475,12 @@ class Bridge:

            self._start_ws_sse(ws_id)

-            resolved_session_id = data.get("session_id", "") if resumed else ""
-
            self._publish_global(
                WorkstreamCreatedEvent(
                    ws_id=ws_id,
                    name=ws_name,
                    correlation_id=correlation_id,
                    resumed=resumed,
-                    session_id=resolved_session_id,
                    message_count=data.get("message_count", 0),
                )
            )
@@ -500,10 +497,9 @@ class Bridge:
            if resumed:
                self._publish_ws(
                    ws_id,
-                    SessionResumedEvent(
+                    WorkstreamResumedEvent(
                        ws_id=ws_id,
                        correlation_id=correlation_id,
-                        session_id=resolved_session_id,
                        message_count=data.get("message_count", 0),
                        name=ws_name,
                    ),
@@ -95,7 +95,7 @@ class CreateWorkstreamMessage(InboundMessage):
    target_node: str = ""
    model: str = ""
    initial_message: str = ""
-    resume_session: str = ""
+    resume_ws: str = ""
    user_id: str = ""


@@ -277,7 +277,6 @@ class WorkstreamCreatedEvent(OutboundEvent):
    name: str = ""
    node_id: str = ""
    resumed: bool = False
-    session_id: str = ""
    message_count: int = 0


@@ -337,11 +336,10 @@ class NodeListEvent(OutboundEvent):


@dataclass
-class SessionResumedEvent(OutboundEvent):
-    """Confirmation that a session was resumed during workstream creation."""
+class WorkstreamResumedEvent(OutboundEvent):
+    """Confirmation that a workstream was resumed during creation."""

-    type: str = "session_resumed"
-    session_id: str = ""
+    type: str = "ws_resumed"
    message_count: int = 0
    name: str = ""

@@ -411,7 +409,7 @@ _OUTBOUND_REGISTRY: dict[str, type[OutboundEvent]] = {
        ErrorEvent,
        InfoEvent,
        NodeListEvent,
-        SessionResumedEvent,
+        WorkstreamResumedEvent,
        ClusterStateEvent,
    ]
 }
@@ -26,7 +26,7 @@ from turnstone.api.server_schemas import (
    CreateWorkstreamResponse,
    DashboardResponse,
    HealthResponse,
-    ListSessionsResponse,
+    ListSavedWorkstreamsResponse,
    ListWorkstreamsResponse,
    SendResponse,
 )
@@ -76,7 +76,7 @@ class AsyncTurnstoneServer(_BaseClient):
        name: str = "",
        model: str = "",
        auto_approve: bool = False,
-        resume_session: str = "",
+        resume_ws: str = "",
    ) -> CreateWorkstreamResponse:
        body: dict[str, Any] = {}
        if name:
@@ -85,8 +85,8 @@ class AsyncTurnstoneServer(_BaseClient):
            body["model"] = model
        if auto_approve:
            body["auto_approve"] = True
-        if resume_session:
-            body["resume_session"] = resume_session
+        if resume_ws:
+            body["resume_ws"] = resume_ws
        return await self._request(
            "POST",
            "/v1/api/workstreams/new",
@@ -214,10 +214,12 @@ class AsyncTurnstoneServer(_BaseClient):
                    await consume_task
        return result

-    # -- sessions ------------------------------------------------------------
+    # -- saved workstreams ----------------------------------------------------

-    async def list_sessions(self) -> ListSessionsResponse:
-        return await self._request("GET", "/v1/api/sessions", response_model=ListSessionsResponse)
+    async def list_saved_workstreams(self) -> ListSavedWorkstreamsResponse:
+        return await self._request(
+            "GET", "/v1/api/workstreams/saved", response_model=ListSavedWorkstreamsResponse
+        )

    # -- auth ----------------------------------------------------------------

@@ -307,11 +309,11 @@ class TurnstoneServer:
        name: str = "",
        model: str = "",
        auto_approve: bool = False,
-        resume_session: str = "",
+        resume_ws: str = "",
    ) -> CreateWorkstreamResponse:
        return self._runner.run(
            self._async.create_workstream(
-                name=name, model=model, auto_approve=auto_approve, resume_session=resume_session
+                name=name, model=model, auto_approve=auto_approve, resume_ws=resume_ws
            )
        )

@@ -363,10 +365,10 @@ class TurnstoneServer:
            self._async.send_and_wait(message, ws_id, timeout=timeout, on_event=on_event)
        )

-    # -- sessions ------------------------------------------------------------
+    # -- saved workstreams ----------------------------------------------------

-    def list_sessions(self) -> ListSessionsResponse:
-        return self._runner.run(self._async.list_sessions())
+    def list_saved_workstreams(self) -> ListSavedWorkstreamsResponse:
+        return self._runner.run(self._async.list_saved_workstreams())

    # -- auth ----------------------------------------------------------------

@@ -302,7 +302,7 @@ class WebUI:
 def _build_history(
    session: ChatSession, has_pending_approval: bool = False
 ) -> list[dict[str, Any]]:
-    """Build a history replay list from session messages.
+    """Build a history replay list from ChatSession messages.

    When ``has_pending_approval`` is True, the last assistant entry's
    tool_calls are marked ``"pending": True`` so the client renders them
@@ -566,7 +566,6 @@ async def list_workstreams(request: Request) -> JSONResponse:
                "id": ws.id,
                "name": ws.name,
                "state": ws.state.value,
-                "session_id": ws.session.session_id if ws.session else None,
            }
        )
    return JSONResponse({"workstreams": result})
@@ -574,7 +573,7 @@ async def list_workstreams(request: Request) -> JSONResponse:

 async def dashboard(request: Request) -> JSONResponse:
    """GET /v1/api/dashboard — enriched workstream data + aggregate stats."""
-    from turnstone.core.memory import get_session_name
+    from turnstone.core.memory import get_workstream_display_name

    mgr: WorkstreamManager = request.app.state.workstreams
    wss = mgr.list_all()
@@ -596,13 +595,12 @@ async def dashboard(request: Request) -> JSONResponse:
            active_count += 1
        title = ""
        if ws.session:
-            title = get_session_name(ws.session.session_id) or ""
+            title = get_workstream_display_name(ws.session.ws_id) or ""
        ws_list.append(
            {
                "id": ws.id,
                "name": ws.name,
                "state": ws.state.value,
-                "session_id": ws.session.session_id if ws.session else None,
                "title": title,
                "tokens": tok,
                "context_ratio": round(ctx, 3),
@@ -630,25 +628,23 @@ async def dashboard(request: Request) -> JSONResponse:
    )


-async def list_sessions_endpoint(request: Request) -> JSONResponse:
-    """GET /v1/api/sessions — list saved sessions."""
-    from turnstone.core.memory import list_sessions
+async def list_saved_workstreams(request: Request) -> JSONResponse:
+    """GET /v1/api/workstreams/saved — list saved workstreams with conversation history."""
+    from turnstone.core.memory import list_workstreams_with_history

-    rows = list_sessions(limit=50)
-    sessions = [
+    rows = list_workstreams_with_history(limit=50)
+    result = [
        {
-            "session_id": sid,
+            "ws_id": wid,
            "alias": alias,
            "title": title,
            "created": created,
            "updated": updated,
            "message_count": count,
-            "node_id": node_id,
-            "ws_id": ws_id,
        }
-        for sid, alias, title, created, updated, count, node_id, ws_id in rows
+        for wid, alias, title, created, updated, count, *_extra in rows
    ]
-    return JSONResponse({"sessions": sessions})
+    return JSONResponse({"workstreams": result})


 def _count_ws_states(wss: list[Workstream]) -> dict[str, int]:
@@ -694,7 +690,6 @@ async def metrics_endpoint(request: Request) -> Response:
                {
                    "ws_id": ws.id,
                    "name": ws.name,
-                    "session_id": ws.session.session_id if ws.session else "",
                    "prompt_tokens": ui._ws_prompt_tokens,
                    "completion_tokens": ui._ws_completion_tokens,
                    "messages": ui._ws_messages,
@@ -814,7 +809,7 @@ async def command(request: Request) -> JSONResponse:
        should_exit = ws.session.handle_command(cmd)
        if should_exit:
            ui.on_info("Session ended. You can close this tab.")
-        # Handle UI updates for session-changing commands
+        # Handle UI updates for workstream-changing commands
        cmd_word = cmd.strip().split(None, 1)[0].lower()
        if cmd_word in ("/clear", "/new"):
            ui._enqueue({"type": "clear_ui"})
@@ -826,9 +821,9 @@ async def command(request: Request) -> JSONResponse:
        # Sync in-memory workstream name after any command that can change it.
        # This ensures /api/workstreams and future page loads see the right name.
        if cmd_word in ("/name", "/resume"):
-            from turnstone.core.memory import get_session_name
+            from turnstone.core.memory import get_workstream_display_name

-            updated_name = get_session_name(ws.session.session_id)
+            updated_name = get_workstream_display_name(ws.session.ws_id) if ws.session else None
            if updated_name:
                ws.name = updated_name
    except Exception as e:
@@ -868,20 +863,18 @@ async def create_workstream(request: Request) -> JSONResponse:
                        "reason": "evicted",
                    }
                )
-        # Atomic session resume during creation.
+        # Atomic workstream resume during creation.
        resumed = False
        message_count = 0
-        session_id = ""
-        resume_session_id = body.get("resume_session", "")
-        if resume_session_id and ws.session is not None:
-            from turnstone.core.memory import get_session_name, resolve_session
+        resume_ws_id = body.get("resume_ws", "")
+        if resume_ws_id and ws.session is not None:
+            from turnstone.core.memory import get_workstream_display_name, resolve_workstream

-            target_id = resolve_session(resume_session_id)
-            if target_id and ws.session.resume_session(target_id):
+            target_id = resolve_workstream(resume_ws_id)
+            if target_id and ws.session.resume(target_id):
                resumed = True
-                session_id = target_id
                message_count = len(ws.session.messages)
-                ws.name = get_session_name(target_id) or ws.name
+                ws.name = get_workstream_display_name(target_id) or ws.name
                ui = ws.ui
                if isinstance(ui, WebUI):
                    ui._enqueue({"type": "clear_ui"})
@@ -894,7 +887,6 @@ async def create_workstream(request: Request) -> JSONResponse:
                "ws_id": ws.id,
                "name": ws.name,
                "resumed": resumed,
-                "session_id": session_id,
                "message_count": message_count,
            }
        )
@@ -1084,7 +1076,7 @@ def create_app(
                    Route("/api/events/global", global_events_sse),
                    Route("/api/workstreams", list_workstreams),
                    Route("/api/dashboard", dashboard),
-                    Route("/api/sessions", list_sessions_endpoint),
+                    Route("/api/workstreams/saved", list_saved_workstreams),
                    Route("/api/send", send_message, methods=["POST"]),
                    Route("/api/approve", approve, methods=["POST"]),
                    Route("/api/plan", plan_feedback, methods=["POST"]),
@@ -1223,8 +1215,8 @@ def main() -> None:
    parser.add_argument(
        "--resume",
        default=None,
-        metavar="SESSION",
-        help="Resume a previous session by alias or session_id",
+        metavar="WS",
+        help="Resume a previous workstream by alias or ws_id",
    )
    parser.add_argument(
        "--skip-permissions",
@@ -1248,11 +1240,11 @@ def main() -> None:
        help="Port to listen on (default: 8080)",
    )
    parser.add_argument(
-        "--session-retention-days",
+        "--retention-days",
        type=int,
        default=90,
        metavar="DAYS",
-        help="Delete unnamed sessions older than DAYS days on startup, 0 to disable (default: 90)",
+        help="Delete unnamed workstreams older than DAYS days on startup, 0 to disable (default: 90)",
    )
    parser.add_argument(
        "--workstream-idle-timeout",
@@ -1348,10 +1340,10 @@ def main() -> None:
    )
    init_storage(db_backend, path=db_path, url=db_url, pool_size=db_pool_size)

-    # Prune stale / empty sessions on startup
-    from turnstone.core.memory import prune_sessions
+    # Prune stale / empty workstreams on startup
+    from turnstone.core.memory import prune_workstreams

-    prune_sessions(retention_days=args.session_retention_days, log_fn=print)
+    prune_workstreams(retention_days=args.retention_days, log_fn=print)

    # Create client and detect model
    provider_name = args.provider
@@ -1488,16 +1480,16 @@ def main() -> None:
    # Handle --resume
    assert ws.session is not None
    if args.resume:
-        from turnstone.core.memory import resolve_session
+        from turnstone.core.memory import resolve_workstream

-        target_id = resolve_session(args.resume)
+        target_id = resolve_workstream(args.resume)
        if not target_id:
-            log.error("Session not found: %s", args.resume)
+            log.error("Workstream not found: %s", args.resume)
            sys.exit(1)
-        if not ws.session.resume_session(target_id):
-            log.error("Session '%s' has no messages.", args.resume)
+        if not ws.session.resume(target_id):
+            log.error("Workstream '%s' has no messages.", args.resume)
            sys.exit(1)
-        log.info("Resumed session %s (%d messages)", target_id, len(ws.session.messages))
+        log.info("Resumed workstream %s (%d messages)", target_id, len(ws.session.messages))

    # Record detected model in metrics
    _metrics.model = model
@@ -1,6 +1,6 @@
 {
  "name": "plan",
-  "description": "Plan before implementing. An autonomous agent explores the codebase and writes a structured plan to .plan-<session_id>.md (unique per session to avoid workstream collisions). If a plan for this session already exists it is re-read and refined rather than overwritten from scratch. Use plan BEFORE writing code — when the user asks to build, add, refactor, or change something that touches multiple files or has unclear scope. The plan identifies files to modify, existing patterns to reuse, and risks to consider.",
+  "description": "Plan before implementing. An autonomous agent explores the codebase and writes a structured plan to .plan-<ws_id>.md (unique per workstream to avoid collisions). If a plan for this workstream already exists it is re-read and refined rather than overwritten from scratch. Use plan BEFORE writing code — when the user asks to build, add, refactor, or change something that touches multiple files or has unclear scope. The plan identifies files to modify, existing patterns to reuse, and risks to consider.",
  "parameters": {
    "type": "object",
    "properties": {
@@ -617,12 +617,12 @@ function toggleDashboard() {
 function loadDashboard() {
  var tableEl = document.getElementById("dash-ws-table");
  tableEl.innerHTML = '<div class="dashboard-empty">Loading\u2026</div>';
-  document.getElementById("dashboard-session-cards").innerHTML =
+  document.getElementById("dashboard-saved-cards").innerHTML =
    '<div class="dashboard-empty">Loading\u2026</div>';
  var dashP = authFetch("/v1/api/dashboard").then(function (r) {
    return r.json();
  });
-  var sessP = authFetch("/v1/api/sessions").then(function (r) {
+  var sessP = authFetch("/v1/api/workstreams/saved").then(function (r) {
    return r.json();
  });
  Promise.all([dashP, sessP])
@@ -631,19 +631,19 @@ function loadDashboard() {
      var wsList = dashData.workstreams || [];
      var agg = dashData.aggregate || {};
      renderDashboardTable(wsList, agg);
-      // Collect active session IDs for dedup
-      var activeSessionIds = {};
+      // Collect active ws IDs for dedup
+      var activeWsIds = {};
      wsList.forEach(function (ws) {
-        if (ws.session_id) activeSessionIds[ws.session_id] = true;
+        activeWsIds[ws.id] = true;
      });
-      var sessList = (res[1].sessions || []).filter(function (s) {
-        return !activeSessionIds[s.session_id];
+      var savedList = (res[1].workstreams || []).filter(function (s) {
+        return !activeWsIds[s.ws_id];
      });
-      renderDashboardSessions(sessList);
+      renderSavedWorkstreams(savedList);
    })
    .catch(function () {
      tableEl.innerHTML = '<div class="dashboard-empty">Failed to load</div>';
-      document.getElementById("dashboard-session-cards").innerHTML =
+      document.getElementById("dashboard-saved-cards").innerHTML =
        '<div class="dashboard-empty">Failed to load</div>';
    });
 }
@@ -800,30 +800,30 @@ function updateDashFooter(agg) {
      ")";
  }
 }
-function renderDashboardSessions(sessions) {
-  var c = document.getElementById("dashboard-session-cards");
+function renderSavedWorkstreams(items) {
+  var c = document.getElementById("dashboard-saved-cards");
  c.innerHTML = "";
-  if (!sessions.length) {
-    c.innerHTML = '<div class="dashboard-empty">No saved sessions</div>';
+  if (!items.length) {
+    c.innerHTML = '<div class="dashboard-empty">No saved workstreams</div>';
    return;
  }
-  sessions.forEach(function (sess) {
+  items.forEach(function (sess) {
    var card = document.createElement("div");
    card.className = "dashboard-card";
    card.setAttribute("role", "button");
    card.setAttribute("tabindex", "0");
-    var label = sess.alias || sess.title || sess.session_id;
+    var label = sess.alias || sess.title || sess.ws_id;
    card.setAttribute("aria-label", "Resume: " + label);
    card.onclick = function () {
-      dashboardResumeSession(sess.session_id);
+      dashboardResumeSession(sess.ws_id);
    };
    card.onkeydown = function (e) {
      if (e.key === "Enter" || e.key === " ") {
        e.preventDefault();
-        dashboardResumeSession(sess.session_id);
+        dashboardResumeSession(sess.ws_id);
      }
    };
-    var title = sess.alias || sess.title || sess.session_id.substring(0, 12);
+    var title = sess.alias || sess.title || sess.ws_id.substring(0, 12);
    var meta = sess.message_count + " msgs";
    if (sess.updated) meta += " \u00b7 " + formatRelativeTime(sess.updated);
    card.innerHTML =
@@ -861,11 +861,11 @@ function dashboardSwitchWorkstream(wsId) {
    switchTab(wsId);
  } else loadDashboard();
 }
-function dashboardResumeSession(sessionId) {
+function dashboardResumeSession(wsId) {
  authFetch("/v1/api/workstreams/new", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
-    body: JSON.stringify({ resume_session: sessionId }),
+    body: JSON.stringify({ resume_ws: wsId }),
  })
    .then(function (r) {
      if (!r.ok) throw new Error("HTTP " + r.status);
@@ -879,7 +879,7 @@ function dashboardResumeSession(sessionId) {
      // Resume handled atomically by server — history arrives via SSE.
    })
    .catch(function (err) {
-      showToast("Failed to resume session", "error");
+      showToast("Failed to resume workstream", "error");
    });
 }
 function dashboardNewChat() {
@@ -62,9 +62,9 @@
      <span class="dash-footer-nodes" id="dash-footer-nodes"></span>
      <span class="dash-footer-stats" id="dash-footer-stats"></span>
    </div>
-    <section class="dashboard-section" id="dashboard-sessions" aria-label="Recent sessions">
-      <h2 class="dashboard-section-title">Recent Sessions</h2>
-      <div class="dashboard-cards" id="dashboard-session-cards"></div>
+    <section class="dashboard-section" id="dashboard-saved-ws" aria-label="Saved workstreams">
+      <h2 class="dashboard-section-title">Saved Workstreams</h2>
+      <div class="dashboard-cards" id="dashboard-saved-cards"></div>
    </section>
  </div>
 </div>
Author	SHA1	Message	Date
Patrick Buckley	14d57176ce	Bump version to 0.4.4	2026-03-07 15:43:56 -08:00
Patrick Buckley	96084ca5f3	Fix PostgreSQL migration race condition with advisory lock Multiple containers starting simultaneously race on Alembic migrations against shared PostgreSQL. Use pg_advisory_lock so they wait in line. Also update SQLite bootstrap to detect post-migration databases.	2026-03-07 15:41:29 -08:00
Patrick Buckley	8b92302247	Bump version to 0.4.3	2026-03-07 13:11:42 -08:00
Patrick Buckley	e195ca54a6	new high level arch abstract	2026-03-07 13:01:19 -08:00
Patrick Buckley	50277cd4de	Add 10-node cluster profile to Docker Compose	2026-03-07 12:54:41 -08:00
Patrick Buckley	fb190f8977	Normalize session_id into ws_id as sole persistent identity (#29 ) * Normalize session_id into ws_id as sole persistent identity Eliminate the separate session_id concept. The workstream ID (ws_id) is now the single identity used for both real-time routing and conversation persistence, removing a layer of indirection that was 1:1 in practice and buggy on resume (stale pointers, orphaned rows). Schema changes (migration 006): - Drop sessions table; add alias/title columns to workstreams - Rename conversations.session_id → ws_id - Rename session_config table → workstream_config (ws_id column) - Data migration remaps existing conversations to ws_id Storage/API renames: - register_session → register_workstream (already existed, merged) - save_message/load_messages now keyed by ws_id - resolve_session → resolve_workstream - ChatSession.session_id property → ws_id - ChatSession.resume_session() → resume() - resume_session field → resume_ws - SessionResumedEvent → WorkstreamResumedEvent - /api/sessions → /api/workstreams/saved - /sessions slash command → /workstreams - --session-retention-days → --retention-days Channel eviction recovery simplified: reuses old ws_id directly instead of get_session_id_by_ws() reverse lookup. * Fix Copilot review feedback: stale session wording in docs, regenerate OpenAPI spec - docs/channels.md: "resumes the session" → "resumes the workstream", "Session resumed:" → "Resumed:", "old session was pruned" → "old workstream was pruned" - docs/api-reference.md: "Each session object" → "Each saved workstream object", field descriptions updated, removed stale node_id field - sdk/typescript/openapi-server.json: fully regenerated from Python models — removes all stale session_id properties from WorkstreamInfo, DashboardWorkstream, CreateWorkstreamResponse schemas	2026-03-07 12:49:07 -08:00