Adds 0033_add_services_default_buffer_minutes.sql with idempotent
ALTER TABLE to ensure services.default_buffer_minutes exists.
Also fixes _journal.json by adding missing 0031_buffer_rules entry (idx 31)
and 0032_staff_read_at entry (idx 32) that were absent from the journal.
Co-Authored-By: Paperclip <noreply@paperclip.ing>
