* fix(backend): purge workspace_diff cache on workspace delete
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* chore(backend): add sqlx cache for workspace_diff regression test queries
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* fix(backend): clear stale fork diff state on fork creation and backfill
Purge inherited workspace_diff/skip_workspace_diff_tally rows when a fork is
created (reused ids would otherwise leak a prior occupant's cached diff state),
and extend the cleanup migration to drop live-pointing stale skip rows that
short-circuit compare_workspaces before the has_changes reset.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
