- Deleted `access_list_entry`, `location`, `proxy_host`, `proxy_host_access_list`, `session`, `stream_service`, `stream_service_access_list` entities and their corresponding migration files.
- Introduced `editing_session` and `edit_operation` entities with appropriate fields and relationships.
- Updated `mod.rs` and `prelude.rs` to reflect the changes in the entity structure.
- Adjusted migration files to remove obsolete migrations and include new migrations for the editing session and edit operation tables.
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