classify_shapes(repo=...) and the write-path hook looked only at live rows,
so a shape whose row had vanished got a second provisional row under the
same (project, repo, path, symbol, kind). The unique constraint refused it,
and the whole classify batch was lost as a tool error.
provisional_row() now finds the row under that identity, vanished or not.
A vanished row is revived with a reappeared event and keeps its judgment.
A new row is inserted inside a savepoint, so a concurrent insert of the
same identity falls back to that row instead of failing the transaction.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
bvandeusenandClaude Opus 5.5