b13c4be0ed
Production POST /parcels/{cad}/analyze падает с 500:
sqlalchemy.exc.InternalError: (psycopg.errors.InFailedSqlTransaction)
current transaction is aborted, commands ignored until end of transaction block
## Root cause
`compute_velocity()` SQL fails (probably на cad's без conkurrentов / sparse
sale_graph data) → exception caught в try/except → НО db.rollback() отсутствует
→ transaction остаётся в aborted state.
Следующая query (_geotech_risk на line 828) пытается выполниться → крашится
с InFailedSqlTransaction.
## Fix
Wrap velocity в `with db.begin_nested()` — SAVEPOINT pattern (consistent
with PR #124 pzz_loader fix). Failure внутри savepoint:
- Rollbacks ТОЛЬКО savepoint
- Outer transaction остаётся clean
- Subsequent queries (_geotech_risk и пр.) работают
Pattern matches feedback_subagent_delegation audit recommendation для
in-loop / per-section exception handling.
## Impact
POST /parcels/{cad}/analyze больше не 500 при velocity failure. Возвращает
`velocity: null` + остальные fields normal.
Refs: user report 2026-05-15 InFailedSqlTransaction
Co-authored-by: lekss361 <claudestars@proton.me>
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