- migration 0002: unique index on works (parent_id, position)
- matchWork retries the whole transaction on a unique violation (3 attempts)
- addMissingExternalIds uses ON CONFLICT DO NOTHING
- ID matches only return shared works or the user's own; private works cannot carry external ids
- adminMergeWorks requires shared works and repoints non-colliding children
- draft is computed for the aliased work id
Co-Authored-By: Claude Opus 5.5 <[email protected]>
