The PR only shipped a SQLite creator_id migration; MySQL and PostgreSQL were
missing (CodeRabbit) and the SQLite one lacked ON DELETE SET NULL. Regenerate
on top of dev's widget_secret base:
- sqlite 0041: ADD creator_id ... REFERENCES user(id) ON DELETE SET NULL
- mysql 0043: ADD creator_id + FK ON DELETE set null (hand-written snapshot
from dev's 0042 to avoid touching the pre-existing custom_widget_secret FK
that must stay under MySQL's 64-char identifier limit)
- postgresql 0009: ADD creator_id + FK ON DELETE set null
Schema already declares onDelete: set null on integration.creatorId.