- Added columns `wizarr_user_id` and `wizarr_identity_id` to the `activity_session` table.
- Created foreign key constraints for the new columns linking to `user` and `identity` tables.
- Created indexes for the new columns to improve query performance.
- Dropped the `ended_at` column from the `activity_session` table.
- Added a new `active` column to the `activity_session` table with a default value of true.
- Created an index for the `active` column to enhance query efficiency.