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The 162_resource_labels down migration recreated issue_label_workspace_name_lower_idx with a plain CREATE UNIQUE INDEX, which takes a blocking lock on the existing issue_label table during a rollback to v0.3.43 and violates the online-migration rule that every CREATE INDEX must be CONCURRENTLY. CREATE INDEX CONCURRENTLY cannot run in a transaction or a multi-command migration, so the rebuild is split out of 162.down: - 171.down now rebuilds the legacy index as a single CREATE UNIQUE INDEX CONCURRENTLY (the natural inverse of 171.up, which drops it). - 174 (new, no-op up) deletes the agent/skill label rows in its down so they are gone before 171.down rebuilds the workspace-wide unique index. Down migrations apply high->low, so 174.down -> 171.down -> 162.down runs in the required order. - 162.down keeps only the transaction-safe structural teardown. Validated on an isolated Postgres: full up->down->up chain with a colliding issue/agent label pair; the concurrent rebuild succeeds after the rows are deleted, restores the valid pre-162 unique index, and a negative control (rebuild before the delete) fails on the exact collision. Co-authored-by: J <j@multica.ai> Co-authored-by: multica-agent <github@multica.ai>