bulk_operations.performed_by and ticket_templates.created_by had no
ON DELETE clause (defaulting to RESTRICT), unlike every other
user-reference FK in the schema (tickets.*, ticket_attachments,
ticket_dependencies, recurring_tickets, api_keys), which all use
SET NULL. Deleting a user who ever ran a bulk operation or created a
template hard-failed at the DB level instead of nulling the
reference, breaking the pattern used everywhere else.
performed_by was NOT NULL, so it had to become nullable to support
SET NULL, matching how every other SET NULL column is defined.
- Fixed 000_baseline.sql for fresh installs.
- Added 003_fk_on_delete_set_null.sql for existing deployments.
Verified against a local MariaDB instance: reproduced the old RESTRICT
schema, ran the migration (twice, for idempotency), then confirmed
deleting a user with rows in both tables now nulls the references
instead of failing.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MGDKHiU5RJdo3dqQUDow3X
