fix(db): advisory lock on migration boot path (ADR-0036)#38
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…nce (ADR-0036) run_migrations_sync now takes pg_advisory_lock(8675310) (distinct from seed's 8675309) across the detect->stamp->upgrade critical section, released in finally — closes the concurrent-boot migration race (two containers in a blue-green window). Plus a hermetic revision-id <=32-char fence (the v2.75.1 crash-loop invariant). ADR-0035 was taken by report-quality; renumbered 0036. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Wraps run_migrations_sync in a session advisory lock (8675310, distinct from seed's 8675309) across detect->stamp->upgrade, released in finally — closes the concurrent-boot migration race. Plus a revision-id <=32-char fence (v2.75.1 crash-loop invariant). 25 migration/startup tests pass. ADR-0036.