Schema

users

• id
• username
• email
• password_digest
• session_token
• created_at
• updated_at

photos

id img_url author_id created_at updated_at

comments

id body author_id (users) photo_id created_at updated_at

likes

id user_id photo_id created_at updated_at

following

id follower_id following_id created_at updated_at