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* fix(metadata): prevent stale cross-provider IDs * fix(metadata): address stale ID review findings * fix(migrations): build the stale-ID primary key concurrently ALTER TABLE ... ADD PRIMARY KEY builds the index under ACCESS EXCLUSIVE, blocking reads and writes on stale_media_ids for the whole build. Create the wider unique index with CREATE UNIQUE INDEX CONCURRENTLY and attach it with ADD CONSTRAINT ... PRIMARY KEY USING INDEX instead; all three key columns are already NOT NULL, so the attach is metadata-only. Same treatment on the rollback path, plus the repo's INVALID-remnant cleanup so a failed concurrent build is not silently accepted by IF NOT EXISTS. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Quick <31828688+Quick104@users.noreply.github.com> Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>