fix(ai): address reindex-progress review (PR #242)

- Delete the now-orphaned PageRepo.getIdsByWorkspace (its only caller,
  reindexWorkspace, switched to getEmbeddablePageIds). Its docstring still
  claimed "Used by the RAG bulk reindex"; re-grep confirmed zero callers.
- ai-settings.service.reindex(): if aiQueue.add() throws (Redis hiccup/
  shutdown) the worker never runs so its finally->clear() never fires,
  leaving the seeded progress record stuck for the full 1h TTL (button
  stuck "reindexing: 0 of N"). Roll back the seed THIS call wrote
  (seeded flag, only when get() was null) before re-throwing, so a
  concurrent active run's record is never wiped. Add tests for both the
  clear-on-throw and the don't-clear-a-concurrent-run paths.
- Add an integration spec (real Postgres) proving getEmbeddablePageIds'
  WHERE stays in lockstep with countEmbeddablePages: seeds every boundary
  case and asserts the returned id set equals the count.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/server/test/integration/page-embeddable-ids-lockstep.int-spec.ts

@@ -0,0 +1,124 @@
+import { Kysely } from 'kysely';
+import { randomUUID } from 'node:crypto';
+import { PageRepo } from '@docmost/db/repos/page/page.repo';
+import { SpaceMemberRepo } from '@docmost/db/repos/space/space-member.repo';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { getTestDb, destroyTestDb, createWorkspace, createSpace } from './db';
+
+/**
+ * `PageRepo.getEmbeddablePageIds` MUST stay in lockstep with
+ * `PageRepo.countEmbeddablePages` (page.repo.ts) — the bulk reindex iterates the
+ * ID set while the status endpoint reports the count as the live denominator, so
+ * if the two predicates ever diverge the "done X of Y" counter ends on the wrong
+ * total. Both share the SAME WHERE: a page qualifies iff it is non-deleted AND
+ * (text_content has a non-whitespace char OR it has a non-deleted embedding row).
+ *
+ * This is a DB-level invariant: the predicate lives in raw SQL (`text_content ~
+ * '[^[:space:]]'`) and an EXISTS subquery, so a unit test with mocked Kysely
+ * cannot observe it. We seed every boundary case against real Postgres and
+ * assert the returned ID set EQUALS the count (and is exactly the expected set).
+ * A future edit that touches one predicate but not the other turns this red.
+ */
+describe('PageRepo embeddable-page set: getEmbeddablePageIds <-> countEmbeddablePages [integration]', () => {
+  let db: Kysely<any>;
+  let repo: PageRepo;
+  let workspaceId: string;
+  let spaceId: string;
+
+  beforeAll(async () => {
+    db = getTestDb();
+    // Only the Kysely-backed query methods under test are exercised, so the
+    // SpaceMemberRepo / EventEmitter2 deps are never touched — stub them.
+    repo = new PageRepo(
+      db as any,
+      {} as unknown as SpaceMemberRepo,
+      {} as unknown as EventEmitter2,
+    );
+    workspaceId = (await createWorkspace(db)).id;
+    spaceId = (await createSpace(db, workspaceId)).id;
+  });
+
+  afterAll(async () => {
+    await destroyTestDb();
+  });
+
+  // Insert a page with explicit text_content / deleted_at (createPage in db.ts
+  // sets neither), returning its id so the test can assert membership.
+  async function insertPage(args: {
+    textContent: string | null;
+    deletedAt?: Date | null;
+  }): Promise<string> {
+    const id = randomUUID();
+    await db
+      .insertInto('pages')
+      .values({
+        id,
+        slugId: `slug-${id.slice(0, 8)}`,
+        title: `page-${id.slice(0, 8)}`,
+        spaceId,
+        workspaceId,
+        textContent: args.textContent,
+        deletedAt: args.deletedAt ?? null,
+      })
+      .execute();
+    return id;
+  }
+
+  // Insert one embedding chunk row for a page (NOT NULL columns + deleted_at).
+  async function insertEmbedding(
+    pageId: string,
+    opts: { deletedAt?: Date | null } = {},
+  ): Promise<void> {
+    await db
+      .insertInto('pageEmbeddings')
+      .values({
+        id: randomUUID(),
+        workspaceId,
+        pageId,
+        spaceId,
+        chunkIndex: 0,
+        chunkStart: 0,
+        chunkLength: 1,
+        content: 'x',
+        modelName: 'test-model',
+        modelDimensions: 1,
+        deletedAt: opts.deletedAt ?? null,
+      })
+      .execute();
+  }
+
+  it('returns exactly the embeddable set and its size equals countEmbeddablePages', async () => {
+    // IN the set --------------------------------------------------------------
+    // (a) non-deleted page with real body text.
+    const withText = await insertPage({ textContent: 'hello world' });
+    // (b) non-deleted page with NO text but a live embedding row (EXISTS clause:
+    //     a page that lost its text yet still has stale vectors must be visited
+    //     so the reindex can clear them).
+    const noTextLiveEmbedding = await insertPage({ textContent: null });
+    await insertEmbedding(noTextLiveEmbedding);
+
+    // OUT of the set ----------------------------------------------------------
+    // (c) non-deleted, text_content NULL, no embeddings.
+    await insertPage({ textContent: null });
+    // (d) non-deleted, whitespace-only text (regex requires a non-space char).
+    await insertPage({ textContent: '   \n\t  ' });
+    // (e) deleted page WITH body text — excluded by the non-deleted predicate.
+    await insertPage({
+      textContent: 'deleted but had text',
+      deletedAt: new Date(),
+    });
+    // (f) non-deleted, no text, with ONLY a DELETED embedding row — the EXISTS
+    //     subquery filters pe.deleted_at IS NULL, so this stays out.
+    const onlyDeletedEmbedding = await insertPage({ textContent: null });
+    await insertEmbedding(onlyDeletedEmbedding, { deletedAt: new Date() });
+
+    const ids = await repo.getEmbeddablePageIds(workspaceId);
+    const count = await repo.countEmbeddablePages(workspaceId);
+
+    // The two queries agree on the size (the load-bearing lockstep invariant)...
+    expect(ids.length).toBe(count);
+    // ...and the set is exactly the two qualifying pages, nothing else.
+    expect(new Set(ids)).toEqual(new Set([withText, noTextLiveEmbedding]));
+    expect(count).toBe(2);
+  });
+});