* add /api/v1/users/{user_id}/stats endpoint
* return 0 stats and add /api/v1/users/{user_id}/stats/{time_frame}
* use utcnow() as modified date for 0 stats
* add leaderboard stats, periodic update via fastapi-utils
* count label tasks for assistant and prompter replies
* Daily stats update every 15 mins, simplify leaderboard endpoint
* add indices for some created_date columns
* make user stats update intervals configurable
* make sure intervals are positive
* Extract classes UserRepository and TaskRepository from PromptRepository
* move close_task() to TaskRepository and get_user_leaderboard to UserRepository()
* Use UserRepository in leaderboards endpoint, add type annotation to leaderboards endpoint
* Leaderboard endpoints proof of concept
- New leaderboards router
- Two endpoints /api/v1/leaderboards/assistant & /api/v1/leaderboards/prompter
- Function in prompt_repository to calculate user scores
* Separating create vs 'eventual' evaluate routes
* Adding display_name to result
* Missing / in routes
* Updating route to be experimental
* Fixing format for pre-commit
