Implementation Complete Problem: The issue requested comprehensive end-to-end data flow testing to verify that new API fields (from PPLX-12) are correctly captured, stored, and returned. What I Found: The GET /api/queries/{id} endpoint was NOT including the new fields (snippet, last_updated, alt_text, origin_url) when building the response. Changes Made: 1. Fixed queries.py to include new fields in API responses 2. Created 21 backend integration tests for complete data flow 3. Created E2E test file for data flow verification Verification: All 212 backend tests pass including 21 new tests.

## Feature Triage Complete **Status:** NOT FULLY IMPLEMENTED - Partial test coverage exists **Summary:** This ticket requests comprehensive end-to-end data flow testing to verify the PPLX-12 implementation (new API fields: snippet, last_updated, origin_url). While existing tests cover individual components (191 backend tests, 4 E2E test files), there are no tests that verify the complete data flow from Perplexity API -> Database -> API Response -> UI Display. **What Exists:** - Backend unit tests for CRUD operations - E2E tests for basic flows - Schema validation tests **What's Missing:** - Integration tests for complete data flow - Backward compatibility tests (null field handling) - UI display verification for new fields - Live API response field verification **Implementation Location:** - backend/tests/test_data_flow_integration.py (new) - tests/e2e/data-flow.spec.ts (new) **Complexity:** Medium (~20-30 test cases across 3-5 files) See attached triage report for full details.