---
id: T01
parent: S01
milestone: M005
provides: []
requires: []
affects: []
key_files: ["backend/pipeline/stages.py"]
key_decisions: ["Fixed _emit_event to use _get_sync_session() with explicit try/finally close instead of nonexistent _get_session_factory() context manager"]
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "docker exec chrysopedia-api python -c 'from models import PipelineEvent; print("OK")' → OK (exit 0). docker exec chrysopedia-api alembic upgrade head → already at 004_pipeline_events head (exit 0). docker exec chrysopedia-api python -c 'from pipeline.stages import _emit_event, _make_llm_callback; print("OK")' → OK (exit 0). Manual _emit_event test call persisted event to DB and was verified via psql count."
completed_at: 2026-03-30T08:27:47.536Z
blocker_discovered: false
---

# T01: Fixed syntax errors in pipeline event instrumentation — _emit_event and _make_llm_callback now work correctly, events persist to pipeline_events table

> Fixed syntax errors in pipeline event instrumentation — _emit_event and _make_llm_callback now work correctly, events persist to pipeline_events table

## What Happened
---
id: T01
parent: S01
milestone: M005
key_files:
  - backend/pipeline/stages.py
key_decisions:
  - Fixed _emit_event to use _get_sync_session() with explicit try/finally close instead of nonexistent _get_session_factory() context manager
duration: ""
verification_result: passed
completed_at: 2026-03-30T08:27:47.536Z
blocker_discovered: false
---

# T01: Fixed syntax errors in pipeline event instrumentation — _emit_event and _make_llm_callback now work correctly, events persist to pipeline_events table

**Fixed syntax errors in pipeline event instrumentation — _emit_event and _make_llm_callback now work correctly, events persist to pipeline_events table**

## What Happened

The PipelineEvent model, Alembic migration 004, and event instrumentation code already existed but _emit_event and _make_llm_callback in stages.py had critical syntax errors: missing triple-quote docstrings, unquoted string literals, unquoted logger format string, and reference to nonexistent _get_session_factory(). Fixed all issues, replaced _get_session_factory() with existing _get_sync_session(), rebuilt and redeployed containers. Verified 24 real events already in the pipeline_events table from prior runs, and confirmed the fixed functions import and execute correctly.

## Verification

docker exec chrysopedia-api python -c 'from models import PipelineEvent; print("OK")' → OK (exit 0). docker exec chrysopedia-api alembic upgrade head → already at 004_pipeline_events head (exit 0). docker exec chrysopedia-api python -c 'from pipeline.stages import _emit_event, _make_llm_callback; print("OK")' → OK (exit 0). Manual _emit_event test call persisted event to DB and was verified via psql count.

## Verification Evidence

| # | Command | Exit Code | Verdict | Duration |
|---|---------|-----------|---------|----------|
| 1 | `docker exec chrysopedia-api python -c 'from models import PipelineEvent; print("OK")'` | 0 | ✅ pass | 1000ms |
| 2 | `docker exec chrysopedia-api alembic upgrade head` | 0 | ✅ pass | 1000ms |
| 3 | `docker exec chrysopedia-api python -c 'from pipeline.stages import _emit_event, _make_llm_callback; print("OK")'` | 0 | ✅ pass | 1000ms |


## Deviations

Model, migration, and instrumentation code already existed — task became a syntax fix rather than writing from scratch. Replaced nonexistent _get_session_factory() with existing _get_sync_session() pattern.

## Known Issues

None.

## Files Created/Modified

- `backend/pipeline/stages.py`


## Deviations
Model, migration, and instrumentation code already existed — task became a syntax fix rather than writing from scratch. Replaced nonexistent _get_session_factory() with existing _get_sync_session() pattern.

## Known Issues
None.
