1. 유저

users

• user_id (PK)
• kakao_oauth_id (UNIQUE)
• profile_photo_id (FK to photo)
• nickname (VARCHAR(100))
• position (ENUM('VOCAL', 'GUITAR', 'KEYBOARD', 'BASS', 'DRUM', 'OTHER'))
• university_id (FK to university)
• admin_role (ENUM('ADMIN', ‘USER'))
• created_at, updated_at
• deleted_at (nullable)

// photo.photo_id를 참조하며, 해당 photo 레코드의 photo_type은 'PROFILE'이어야 함.

user_timetable

• user_timetable_id (PK)
• user_id (FK to users)
• name (VARCHAR(100))
• user_timetable_data (JSON)
• created_at, updated_at