Merge branch 'pr-1553' into integration/validation-batch

# Conflicts:
#	src/services/worker/session/SessionCompletionHandler.ts

tests/services/sqlite/session-store-mark-completed.test.ts

@@ -0,0 +1,66 @@
+/**
+ * Tests for SessionStore.markSessionCompleted (fix for #1532)
+ *
+ * Mock Justification: NONE (0% mock code)
+ * - Uses real SQLite with ':memory:' - tests actual SQL and schema
+ */
+import { describe, it, expect, beforeEach, afterEach } from 'bun:test';
+import { SessionStore } from '../../../src/services/sqlite/SessionStore.js';
+
+describe('SessionStore.markSessionCompleted', () => {
+  let store: SessionStore;
+
+  beforeEach(() => {
+    store = new SessionStore(':memory:');
+  });
+
+  afterEach(() => {
+    store.close();
+  });
+
+  it('sets status to completed and records completed_at timestamps', () => {
+    const before = Date.now();
+    const id = store.createSDKSession('session-1', 'project', 'prompt');
+
+    store.markSessionCompleted(id);
+
+    const row = store.db.prepare(
+      'SELECT status, completed_at, completed_at_epoch FROM sdk_sessions WHERE id = ?'
+    ).get(id) as { status: string; completed_at: string; completed_at_epoch: number };
+
+    expect(row.status).toBe('completed');
+    expect(row.completed_at).toBeTruthy();
+    expect(row.completed_at_epoch).toBeGreaterThanOrEqual(before);
+    expect(row.completed_at_epoch).toBeLessThanOrEqual(Date.now());
+  });
+
+  it('leaves other sessions unaffected', () => {
+    const id1 = store.createSDKSession('session-a', 'project', 'prompt');
+    const id2 = store.createSDKSession('session-b', 'project', 'prompt');
+
+    store.markSessionCompleted(id1);
+
+    const row2 = store.db.prepare(
+      'SELECT status, completed_at FROM sdk_sessions WHERE id = ?'
+    ).get(id2) as { status: string; completed_at: string | null };
+
+    expect(row2.status).toBe('active');
+    expect(row2.completed_at).toBeNull();
+  });
+
+  it('does not throw when called on a non-existent session id', () => {
+    expect(() => store.markSessionCompleted(99999)).not.toThrow();
+  });
+
+  it('completed_at is a valid ISO timestamp', () => {
+    const id = store.createSDKSession('session-iso', 'project', 'prompt');
+    store.markSessionCompleted(id);
+
+    const row = store.db.prepare(
+      'SELECT completed_at FROM sdk_sessions WHERE id = ?'
+    ).get(id) as { completed_at: string };
+
+    expect(() => new Date(row.completed_at).toISOString()).not.toThrow();
+    expect(new Date(row.completed_at).getTime()).toBeGreaterThan(0);
+  });
+});