fix(session state): implement optimistic locking and collision retries for session concurrency - #18
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junxiant
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Sep 11, 2026
junxiant
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- Add version column and idx_sessions_updated_at index to sessions table in Postgres and SQLite
- Add automatic schema migration in _init_db_once for existing databases
- Introduce SessionConcurrencyError and conditional updates on matching version
- Add collision retry loop with backoff and fresh dialogue merging in record_turn()
- Implement delete_expired_sessions(ttl_days=30) for future automated cleanup
- Add test coverage for collision detection, parallel turn merging, and TTL cleanup
- Document session state concurrency improvements in CHANGES.md
…ssion concurrency - Add version column and idx_sessions_updated_at index to sessions table in Postgres and SQLite - Add automatic schema migration in _init_db_once for existing databases - Introduce SessionConcurrencyError and conditional updates on matching version - Add collision retry loop with backoff and fresh dialogue merging in record_turn() - Implement delete_expired_sessions(ttl_days=30) for automated database cleanup - Add test coverage for collision detection, parallel turn merging, and TTL cleanup - Document session state concurrency improvements in CHANGES.md
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