tests: fix flaky cleanup test timing for CI

tests/test_scheduled_cleanup.py

@@ -62,25 +62,26 @@ class TestScheduledCleanup:
             "/",
             data="test content",
             content_type="text/plain",
-            headers={**auth_header, "X-Expiry": "1"},  # 1 second
+            headers={**auth_header, "X-Expiry": "2"},  # 2 seconds
         )
         assert response.status_code == 201
         paste_id = json.loads(response.data)["id"]
 
-        # Wait for expiry
-        time.sleep(1.5)
+        # Wait for expiry (extra buffer for CI timing)
+        time.sleep(3)
 
         # Trigger cleanup via database function
         with app.app_context():
             from app.database import cleanup_expired_pastes
 
             count = cleanup_expired_pastes()
-            assert count >= 1
+            # At least our paste should be cleaned up
+            assert count >= 1, f"Expected cleanup to remove at least 1 paste, got {count}"
 
             # Verify paste is gone
             db = get_db()
             row = db.execute("SELECT id FROM pastes WHERE id = ?", (paste_id,)).fetchone()
-            assert row is None
+            assert row is None, f"Paste {paste_id} should have been deleted"
 
     def test_rate_limit_cleanup(self, app, client):
         """Test that rate limit entries are cleaned up."""