* fix: Increase valid user-supplied URL length to 1024
* fix: Wrap URL length migration in a transaction
Wrap the multi-column changeColumn operations in a transaction so a
failure on any column rolls back the whole migration rather than leaving
the database partially migrated.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>