RenameDependencyPrefix updates issue IDs in the dependencies table but was not rebuilding the blocked_issues_cache, leaving stale IDs in the cache that no longer exist in the issues table. Add invalidateBlockedCache() call at the end of RenameDependencyPrefix to rebuild the cache with the new issue IDs. Fixes: GH#1016 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>