API Graph Endpoint Systematic Failure

Goal

Root cause: All /api/graph/* endpoints return 502 errors, indicating the graph data generation or network analysis service is completely broken

Acceptance Criteria

Approach

Read existing code and understand current state

Implement required changes

Test changes

Commit and push

Dependencies

(none listed)

Dependents

(none listed)

Work Log

2026-04-21 00:30 UTC — Verification Analysis

• Task is REOPENED — previously marked done but audit could not verify work landed on main
• Checked git log for prior commits: no commits referencing this task ID found
• Verified current state of main (c236a86fc): all /api/graph/* endpoints are functional

Already Resolved — 2026-04-21 00:35:00Z

Evidence: Live API verification on localhost:8000 — all graph endpoints return HTTP 200 (or 422 for validation errors on missing params, which is correct behavior).

Endpoint verification results:

200 /api/graph                    — paginated graph edges+nodes, stats
200 /api/graph/top                — top-connected entities
200 /api/graph/stats             — 46507 nodes, 711721 edges
422 /api/graph/search            — correct 422 (q param required)
200 /api/graph/neighborhood/ALS2 — 1-hop neighborhood
200 /api/graph/dependency-dag   — hypothesis/experiment DAG
200 /api/graph/critical-path     — longest-path computation
200 /api/graph/validate-dag     — cycle detection
404 /api/graph/frontier          — expected 404 (not implemented)
404 /api/graph/sparse            — expected 404 (not implemented)

Root cause of original 502 errors: Prior commits (7e74e48c, 873dc8832, 142f81987, d55f017b0, 4dacc7025) fixed PostgreSQL compatibility issues:

• dict_row factory lacks integer indexing → fixed with _PgRow wrapper
• GROUP BY/HAVING alias errors → fixed with explicit COUNT(*) expressions
• LOWER() B-tree corruption → replaced with COLLATE NOCASE/indexed lookups

Commit that confirmed resolution: Multiple agents' fixes landed across Apr 13-20, culminating in c236a86fc.

Conclusion: Task is already resolved. No code changes needed.

File: 355a0e0b_92d_spec.md

Modified: 2026-04-25 23:40

Size: 2.3 KB