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Run 26566803068 created project_routing_snapshots successfully on prod (CREATE TABLE + partitions + RLS + GRANTs all committed). Marker INSERT into migrations table failed: "there is no unique or exclusion constraint matching the ON CONFLICT specification" because Laravel's migrations table has no UNIQUE on `migration` column. Replaced with INSERT...SELECT WHERE NOT EXISTS for idempotency. Table is now LIVE on prod — next workflow run will skip the CREATE block (TABLE_EXISTS check passes) and go straight to the now-fixed marker INSERT. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>