#17: implement DANE TLSA, MTA-STS policy resolution, ARC sealing and mail authentication

migrations/0004_index_outbound_stale_locks.down.sql

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+DROP INDEX IF EXISTS idx_outbound_stale_locks;

migrations/0004_index_outbound_stale_locks.up.sql

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+-- Delivery workers claim a job by moving it to SENDING with a lock deadline.
+-- If the worker dies before releasing it, the job must be picked up again once
+-- the lock expires; without this index that reclaim scan is a sequential scan
+-- over every job ever queued.
+CREATE INDEX idx_outbound_stale_locks ON outbound_jobs(locked_until)
+    WHERE status = 'SENDING';