diff --git a/tests/test_app_js.py b/tests/test_app_js.py
index f3f61d68..90964f02 100644
--- a/tests/test_app_js.py
+++ b/tests/test_app_js.py
@@ -1328,6 +1328,28 @@ def test_redact_credentials_runtime_smoke() -> None:
         + "const ak = redactCredentials('api_key=abcdefghijklmnopqrstuvwxyz');\n"
         + "if (ak !== '[REDACTED:api_key]') "
         + "throw new Error('api_key= clean redact failed: ' + ak);\n"
+        + "// Prefilter fast path: plain text with no anchor substring is unchanged\n"
+        + "const fp = redactCredentials('build ok in 42s - 3 tests passed');\n"
+        + "if (fp !== 'build ok in 42s - 3 tests passed') "
+        + "throw new Error('prefilter fast-path no-op failed: ' + fp);\n"
+        + "// Bare credentials with no =, quote or @ anywhere must still redact\n"
+        + "// (these pin the prefilter as a superset of the pattern set)\n"
+        + "const bk = redactCredentials('loaded sk-abcdefghijklmnopqrstuvwx');\n"
+        + "if (bk !== 'loaded [REDACTED:api_key]') "
+        + "throw new Error('bare sk- redact failed: ' + bk);\n"
+        + "const aw = redactCredentials('using AKIAABCDEFGHIJKLMNOP now');\n"
+        + "if (aw !== 'using [REDACTED:api_key] now') "
+        + "throw new Error('bare AKIA redact failed: ' + aw);\n"
+        + "const bt = redactCredentials('Bearer abcdefghijklmnopqrstuvwxyz');\n"
+        + "if (bt !== '[REDACTED:api_key]') "
+        + "throw new Error('bare bearer redact failed: ' + bt);\n"
+        + "// SQLAlchemy dialect+driver connection URLs (psycopg2/asyncpg)\n"
+        + "const pg2 = redactCredentials('postgresql+psycopg2://user:s3cret@db:5432/app');\n"
+        + "if (pg2 !== 'postgresql+psycopg2://user:[REDACTED:password]@db:5432/app') "
+        + "throw new Error('psycopg2 conn redact failed: ' + pg2);\n"
+        + "const apg = redactCredentials('postgresql+asyncpg://user:s3cret@db/app');\n"
+        + "if (apg !== 'postgresql+asyncpg://user:[REDACTED:password]@db/app') "
+        + "throw new Error('asyncpg conn redact failed: ' + apg);\n"
     )
     with tempfile.NamedTemporaryFile(mode="w", suffix=".mjs", delete=False) as f:
         f.write(harness)
diff --git a/tests/test_output_guard.py b/tests/test_output_guard.py
index abd077c3..e7cb7935 100644
--- a/tests/test_output_guard.py
+++ b/tests/test_output_guard.py
@@ -236,6 +236,20 @@ class TestCredentialLeakage:
         assert r.sanitized is not None
         assert "s3cretpw" not in r.sanitized
 
+    def test_sqlalchemy_driver_connection_string(self) -> None:
+        # SQLAlchemy dialect+driver URLs must match — the bare-dialect
+        # list alone leaked these (only +psycopg was enumerated).
+        for url in (
+            "postgresql+psycopg2://admin:s3cret_pass@db.internal:5432/prod",
+            "postgresql+asyncpg://admin:s3cret_pass@db.internal/prod",
+            "mysql+pymysql://admin:s3cret_pass@db.internal/prod",
+        ):
+            r = evaluate_output(url)
+            assert "connection_string_leak" in r.flags, url
+            assert r.sanitized is not None, url
+            assert "s3cret_pass" not in r.sanitized, url
+            assert ":[REDACTED:password]@" in r.sanitized, url
+
     def test_bearer_scheme_case_insensitive(self) -> None:
         # RFC 7235 scheme name is case-insensitive.
         r = evaluate_output("authorization: bearer eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxIn0.sig12345")
diff --git a/turnstone/core/output_guard.py b/turnstone/core/output_guard.py
index 5d1fc7cd..4862755f 100644
--- a/turnstone/core/output_guard.py
+++ b/turnstone/core/output_guard.py
@@ -94,9 +94,12 @@ _RE_PRIVATE_KEY_BLOCK = re.compile(
 # ``redact_credentials`` — error persistence, audit details,
 # coordinator inspect/wait surfaces.  The structural form ``[^:@\s]+:
 # [^@\s]+@`` is specific enough that ``https://example.com:8080/path``
-# (host:port without ``@``) doesn't match.
+# (host:port without ``@``) doesn't match.  The optional ``+suffix``
+# covers SQLAlchemy dialect+driver URLs (``postgresql+psycopg2``,
+# ``postgresql+asyncpg``, ``mysql+pymysql``) and ``mongodb+srv`` —
+# enumerating drivers is a losing game, the suffix shape isn't.
 _RE_CONNECTION_STRING = re.compile(
-    r"(?:postgresql\+?(?:psycopg)?|mysql|mongodb(?:\+srv)?|rediss?|amqps?|sqlite|https?)"
+    r"(?:postgresql|mysql|mongodb|rediss?|amqps?|sqlite|https?)(?:\+[a-z0-9]*)?"
     r"://[^:@\s]+:[^@\s]+@",
 )
 _RE_ENV_SECRET_LINE = re.compile(r"[A-Z][A-Z_0-9]+=\S+")
diff --git a/turnstone/shared_static/redact_credentials.js b/turnstone/shared_static/redact_credentials.js
index 4c90c157..b4d80c5d 100644
--- a/turnstone/shared_static/redact_credentials.js
+++ b/turnstone/shared_static/redact_credentials.js
@@ -18,6 +18,10 @@
 //   6. JSON secret keys              → "secret": "[REDACTED:secret]"
 //   7. ENV secret lines              → SECRET_KEY=[REDACTED:secret]
 //
+// A single prefilter scan (_RE_PREFILTER) bails out before all of the
+// above when the text cannot contain any credential — the common case
+// for plain-log tool output.
+//
 // House style: no innerHTML, no DOM access, no side-effects.
 
 // ---------------------------------------------------------------------------
@@ -30,9 +34,13 @@ const _RE_PRIVATE_KEY_BLOCK =
 // Connection strings — preserves protocol + user, redacts only the password
 //   postgresql://user:pass@host   →   postgresql://user:[REDACTED:password]@host
 //   https://user:token@api.example.com → https://user:[REDACTED:password]@api.example.com
+// The optional +suffix covers SQLAlchemy dialect+driver URLs
+// (postgresql+psycopg2, postgresql+asyncpg, mysql+pymysql) and
+// mongodb+srv — enumerating drivers is a losing game, the suffix
+// shape isn't.
 // ---------------------------------------------------------------------------
 const _RE_CONNECTION_STRING =
-  /(?:postgresql\+?(?:psycopg)?|mysql|mongodb(?:\+srv)?|rediss?|amqps?|sqlite|https?):\/\/[^:@\s]+:[^@\s]+@/g;
+  /(?:postgresql|mysql|mongodb|rediss?|amqps?|sqlite|https?)(?:\+[a-z0-9]*)?:\/\/[^:@\s]+:[^@\s]+@/g;
 
 const _RE_CONN_USERINFO = /:\/\/([^:@\s]+):([^@\s]+)@/;
 
@@ -64,11 +72,17 @@ const _CREDENTIAL_REPLACEMENTS = [
   // like "monkey=" or "turkey=".  Bare "token=" included via negative
   // lookbehind so standalone assignments still match (token=abcdef...)
   // without matching word suffixes like "over_tokenized=".
-  [/(?:(?:access|refresh|auth|api|session|bearer|secret)_?token|(?<![a-zA-Z0-9_])token)=[a-zA-Z0-9]{20,}/g, "[REDACTED:api_key]"],
+  [
+    /(?:(?:access|refresh|auth|api|session|bearer|secret)_?token|(?<![a-zA-Z0-9_])token)=[a-zA-Z0-9]{20,}/g,
+    "[REDACTED:api_key]",
+  ],
   // key=<value> (20+).  Same bounded prefix approach: api_key=/secret_key= etc.
   // but not monkey= or turkey=.  Bare "key=" included with negative lookbehind.
   // Multi-segment keys secret_access_key / aws_secret_access_key included explicitly.
-  [/(?:(?:api|secret|session|auth|encryption|signing|private|public|access|secret_access|aws_secret_access)_?key|(?<![a-zA-Z0-9_])key)=[a-zA-Z0-9]{20,}/g, "[REDACTED:api_key]"],
+  [
+    /(?:(?:api|secret|session|auth|encryption|signing|private|public|access|secret_access|aws_secret_access)_?key|(?<![a-zA-Z0-9_])key)=[a-zA-Z0-9]{20,}/g,
+    "[REDACTED:api_key]",
+  ],
 ];
 
 // ---------------------------------------------------------------------------
@@ -76,7 +90,8 @@ const _CREDENTIAL_REPLACEMENTS = [
 //   ?api_key=abc123   →   ?api_key=***   (legacy _redactApiKeys compat)
 //   &secret=value     →   &secret=***
 // ---------------------------------------------------------------------------
-const _RE_QUERY_CRED = /(?:api_key|apiKey|api-key|(?<![a-zA-Z0-9_])token|secret|password|auth)=[^&\s"]+/g;
+const _RE_QUERY_CRED =
+  /(?:api_key|apiKey|api-key|(?<![a-zA-Z0-9_])token|secret|password|auth)=[^&\s"]+/g;
 
 // ---------------------------------------------------------------------------
 // JSON-style simple redaction (legacy _redactApiKeys compat)
@@ -119,6 +134,24 @@ function _redactEnvLine(match) {
   return match;
 }
 
+// ---------------------------------------------------------------------------
+// Prefilter — one early-exit scan deciding whether the pipeline can match.
+// MUST remain a superset of every pattern above: each pattern requires at
+// least one of these substrings, so skipping on a prefilter miss is sound.
+// Anchor → patterns:
+//   =           env lines, key=/token= assignments, query-string creds
+//   " '         JSON-style and JSON-secret forms
+//   @           connection-string userinfo
+//   -----BEGIN  PEM private key blocks
+//   sk- ghp_ gho_ AKIA AIza bearer   well-known key prefixes ("bearer" is
+//               case-insensitive per RFC 7235; /i over-approximates the
+//               case-sensitive prefixes, which only costs a full scan)
+// Adding a pattern above without an anchor here is a SILENT REDACTION
+// BYPASS — extend this regex and the runtime smoke test together
+// (tests/test_app_js.py::test_redact_credentials_runtime_smoke).
+// ---------------------------------------------------------------------------
+const _RE_PREFILTER = /[='"@]|-----BEGIN|sk-|ghp_|gho_|AKIA|AIza|bearer/i;
+
 // ---------------------------------------------------------------------------
 // Public API
 // ---------------------------------------------------------------------------
@@ -138,6 +171,11 @@ export function redactCredentials(text) {
 
   let result = String(text);
 
+  // Fast bailout — most tool output (plain logs, timestamps, table data)
+  // carries no anchor substring; one early-exit scan skips the sixteen
+  // replace passes below.  Soundness argument lives on _RE_PREFILTER.
+  if (!_RE_PREFILTER.test(result)) return result;
+
   // 1. PEM private key blocks (whole-block removal)
   result = result.replace(_RE_PRIVATE_KEY_BLOCK, "[REDACTED:private_key]");