docs(release): document post-tarball migration hotfix procedure

CLAUDE.md

@@ -406,4 +406,34 @@ npx prisma migrate resolve --applied <migration_name>
    - Apply Prisma migrations: `npx prisma migrate deploy`
    - Restart: `pm2 restart app-ts --update-env`
 
+### Hotfixing a migration that was added after the tarball was built
+
+If you write a new `prisma/migrations/<timestamp>_*` folder **after** the
+release tarball has already been built and shipped, that migration is
+NOT in the tarball and `prisma migrate deploy` on prod will report
+"No pending migrations". The release tarball re-build re-runs the whole
+release, but for a one-off hotfix you can ship just the new migration
+folder:
+
+```bash
+# Local
+cd prisma/migrations
+tar -czf /tmp/warehouse_perms_migration.tar.gz <timestamp>_<name>/
+scp /tmp/warehouse_perms_migration.tar.gz boha_admin@192.168.50.100:/tmp/
+
+# On prod
+ssh boha_admin@192.168.50.100
+cd /var/www/app-ts/prisma/migrations
+sudo -u boha_admin tar -xzf /tmp/warehouse_perms_migration.tar.gz
+cd /var/www/app-ts
+npx prisma migrate deploy
+pm2 restart app-ts --update-env
+```
+
+The migration is still tracked in git and applied via `prisma migrate
+deploy` — the only thing the tarball is doing is delivering the
+`migration.sql` to prod, which is the same mechanism the main release
+uses. This is preferred over running raw SQL on prod (which the policy
+in "Database Migrations" forbids).
+
 Do not push directly to production or restart services without confirmation.