PUT /image/tags/{id} renames a tag globally; DELETE /image/tags/{id}
removes a tag and every photo's reference. Rename returns 200/404/409
(case-insensitive name conflict) / 400 (empty name); delete returns
204/404. New migration adds a UNIQUE COLLATE NOCASE index on
tags.name with a pre-flight pass that collapses existing case-
insensitive duplicates onto the lowest id.
The connection setup now sets PRAGMA foreign_keys = ON. The schema
already declares ON DELETE CASCADE / SET NULL on several tables —
those clauses were documentation-only because SQLite has FK
enforcement off per-connection by default. Audited every
diesel::delete site; each touches either no inbound FKs or has a
matching policy. delete_tag relies on the tagged_photo cascade
instead of doing manual cleanup.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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