ALTER threads_meta / runs / feedback / run_events to add nullable
workspace_id String(36) + FK to workspaces (ON DELETE CASCADE) and a
composite (workspace_id, user_id, updated_at) index on threads_meta for
the workspace-scoped thread-list query. Downgrade reverses all four FKs,
columns, and the index.
Stage 0 PR5 step 1/2; revision 0003 flips NOT NULL after the backfill.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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