Addresses review on PR #227.
- setAlias confirmed-reassign branch: DELETE the target page's existing
alias row(s) BEFORE retargeting `byName` onto the page, instead of after.
The new partial unique index `(workspace_id, page_id)` is non-deferrable
and checked at each statement, so retargeting first momentarily left two
rows for the page -> immediate 23505 -> rolled-back tx surfaced as a
misleading "Alias already taken" (regressing a previously-working swap onto
a page that already had its own alias). The reordered branch needs no
trailing self-heal. JSDoc updated to describe the real ordering.
- catch block: the postgres@3.x driver exposes the violated index as
`err.constraint_name` (with `.constraint` as a fallback). Map
`share_aliases_workspace_id_alias_unique` -> "Alias already taken" and the
new `share_aliases_workspace_id_page_id_unique` -> a distinct ALIAS_PAGE_RACE
outcome (a concurrent same-page write, not a name clash). Always log the
constraint name on any 23505 so the race is diagnosable.
- migration 20260627T120000: document that the dedup DELETE is intended,
irreversible data loss (old duplicate `/l/<old>` links start 404ing after
upgrade; `down()` cannot restore the rows). Same note added to CHANGELOG
[Unreleased] Fixed.
Tests:
- integration: confirmed reassign onto a page that ALREADY has its own alias
(RED before the reorder); migration up() dedup scoping across pages and a
second workspace; mid-transaction error -> BadRequest with clean rollback.
- unit: constraint_name distinguishing (alias index, page_id index, fallback
`.constraint`, no-info default) and non-unique error -> BadRequest; retarget
test now asserts delete-before-update order.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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