Previous migration hard-coded FK constraint names and missed
firmware_releases.uploaded_by, firmware_rollouts.created_by/release_id,
os_update_releases.uploaded_by, os_update_rollouts.created_by/release_id,
pairing_codes.consumed_by_kiosk_id, entities.camera_id.
Now uses information_schema to dynamically drop ALL FK constraints
before type conversion, and dynamically finds ALL integer id/*_id
columns to convert. No more missed FKs.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>