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perf: partial index so the startup NULL-active repair skips the table scan

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Review finding: EXPLAIN QUERY PLAN showed the unconditional repair
UPDATE doing SCAN messages (~75-135ms on 500k rows, every startup) —
the existing idx_messages_session_active can't serve an active-only
predicate. A partial index on (active) WHERE active IS NULL costs
near-zero storage on healthy DBs (no NULL rows) and drops the 0-match
repair to ~0.04ms. Lives in DEFERRED_INDEX_SQL because it references
the reconciler-added column.
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kshitijk4poor 2026-07-07 14:33:01 +05:30 • committed by kshitij
parent b75783e6dc
commit 11516f3cc3
1 changed files with 2 additions and 0 deletions
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hermes_state.py
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@ -802,6 +802,8 @@ CREATE INDEX IF NOT EXISTS idx_compression_locks_expires ON compression_locks(ex
DEFERRED_INDEX_SQL = """
CREATE INDEX IF NOT EXISTS idx_messages_session_active
ON messages(session_id, active, timestamp);
CREATE INDEX IF NOT EXISTS idx_messages_active_null
ON messages(active) WHERE active IS NULL;
CREATE INDEX IF NOT EXISTS idx_sessions_session_key
ON sessions(session_key, started_at DESC);
CREATE INDEX IF NOT EXISTS idx_sessions_gateway_peer