- Add 4 indexes on appointments: client_id, staff_id, start_time, status
- Add index on pets.client_id
- Add index on clients.email
- Change clients.email to NOT NULL with backfill migration
- Wrap S3 deleteObject calls in try/catch in pets photo endpoints
- Update POST /clients test to include required email field
Co-Authored-By: Paperclip <noreply@paperclip.ing>