Felipe Cardoso 7280b182bd fix(backend): race condition fixes for task completion and sprint operations ...

## Changes

### agent_instance.py - Task Completion Counter Race Condition
- Changed `record_task_completion()` from read-modify-write pattern to
  atomic SQL UPDATE
- Previously: Read instance → increment in Python memory → write back
- Now: Uses `UPDATE ... SET tasks_completed = tasks_completed + 1`
- Prevents lost updates when multiple concurrent task completions occur

### sprint.py - Row-Level Locking for Sprint Operations
- Added `with_for_update()` to `complete_sprint()` to prevent race
  conditions during velocity calculation
- Added `with_for_update()` to `cancel_sprint()` for consistency
- Ensures atomic check-and-update for sprint status changes

## Impact
These fixes prevent:
- Counter metrics being lost under concurrent load
- Data corruption during sprint completion
- Race conditions with concurrent sprint status changes

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2025-12-31 17:23:33 +01:00

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