fix(qa): use SQLite Matrix E2EE state

extensions/qa-matrix/src/substrate/e2ee-client.test.ts

@@ -1,4 +1,6 @@
 // Qa Matrix tests cover e2ee client plugin behavior.
+import { access, mkdtemp, rm } from "node:fs/promises";
+import os from "node:os";
 import path from "node:path";
 import { describe, expect, it } from "vitest";
 import { testing } from "./e2ee-client.js";
@@ -39,6 +41,21 @@ describe("matrix qa e2ee client storage", () => {
     expect(second.storagePath).toBe(first.storagePath);
   });
 
+  it("uses plugin state without creating a legacy IndexedDB snapshot", async () => {
+    const outputDir = await mkdtemp(path.join(os.tmpdir(), "matrix-qa-e2ee-storage-"));
+    try {
+      const storage = await testing.prepareMatrixQaE2eeStorage({
+        actorId: "driver",
+        outputDir,
+        scenarioId: "matrix-e2ee-basic-reply",
+      });
+
+      await expect(access(storage.idbSnapshotPath)).rejects.toMatchObject({ code: "ENOENT" });
+    } finally {
+      await rm(outputDir, { force: true, recursive: true });
+    }
+  });
+
   it("records late-decrypted payload updates for an existing event id", () => {
     const previous = {
       eventId: "$reply",

extensions/qa-matrix/src/substrate/e2ee-client.ts

@@ -322,11 +322,6 @@ async function prepareMatrixQaE2eeStorage(params: {
   await fs.mkdir(storage.rootDir, { recursive: true });
   await fs.mkdir(storage.accountDir, { recursive: true });
   await fs.mkdir(path.dirname(storage.storagePath), { recursive: true });
-  await fs.writeFile(storage.idbSnapshotPath, "[]\n", { flag: "wx" }).catch((error: unknown) => {
-    if ((error as NodeJS.ErrnoException).code !== "EEXIST") {
-      throw error;
-    }
-  });
   return storage;
 }
 
@@ -583,6 +578,7 @@ export const testing = {
   MATRIX_QA_E2EE_SYNC_FILTER,
   buildMatrixQaE2eeStoragePaths,
   findMatrixQaObservedEventMatch,
+  prepareMatrixQaE2eeStorage,
   shouldRecordMatrixQaObservedEventUpdate,
 };
 export { testing as __testing };