-- Retention support. Three tables grow without bound today:
--
--   idempotency_keys -- the client heartbeats every 10s and mints a fresh key
--     each time, so at 10,000 queued players this alone adds roughly 60,000
--     rows per minute, forever.
--   outbox -- published rows are never purged.
--   sessions -- expired and revoked rows are never purged.
--
-- The maintenance role performed lifecycle reconciliation only, so storage,
-- index size, vacuum pressure, backup size and recovery time all grew without
-- limit on a service meant to scale horizontally.
--
-- These indexes exist to make the deletion predicates cheap; without them each
-- purge pass would sequentially scan the very tables it is trying to bound.

CREATE INDEX IF NOT EXISTS idempotency_keys_created_at
    ON idempotency_keys (created_at);

CREATE INDEX IF NOT EXISTS outbox_published_at
    ON outbox (published_at)
    WHERE published_at IS NOT NULL;

CREATE INDEX IF NOT EXISTS sessions_expires_at
    ON sessions (expires_at);