aaron
30beeb3a26
Adds migrations/ directory with README documenting the convention (timestamped filenames, idempotent SQL, forward-only, single change per file). First migration is the Stage 3 queue routing columns added live during Phase A patches today: state_type, state_type_confidence, supersedes_prior_state, state_type_rationale, plus index on supersedes. Required by stage2_worker.py >= 2.2 and stage3_worker.py >= 2.3. Idempotent (IF NOT EXISTS), safe to re-apply. Verified by re-applying against the live DB — no changes, no errors. Closes a reproducibility gap: a fresh DB provisioned from git would crash on first Stage 2 enqueue without these columns. Now the SQL travels with the code.