DB latency: every projection runs `WHERE event_type=? ORDER BY timestamp DESC
LIMIT n`. With only a plain timestamp index, the latest of a STALE type
backward-scans the whole events table — measured 373ms / ~52k buffers on 235k
rows. Add a composite index in event_store._ensure_schema:
CREATE INDEX idx_events_type_ts ON events(event_type, timestamp DESC)
-> same query is now a 0.018ms index seek (3 buffers). Applied to the live DB
CONCURRENTLY; also dropped two redundant legacy indexes (idx_events_type, now
covered by the composite prefix; idx_events_correlation, a dup of
idx_events_session_id) to cut write overhead.
tests/conftest.py: sweep the throwaway `mem_*` schemas EventStore(":memory:")
creates — 170 had leaked into the shared Postgres, bloating the catalog.
README: rewritten around the current system — PostgreSQL event store, a full
command reference (run_live_paper / momentum CLI / eod_replay / sweeps / tuning /
cron), config knobs, and a database & performance section (the index above,
extension guidance, retention).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Snapshot before the DuckDB->PostgreSQL migration. data/, archive/, the 232MB
rebuild zip, the Windows .venv, and .env are excluded via .gitignore.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
