column	data type	details
id	integer	not null, primary key
username	string	not null, indexed, unique
email	string	not null, indexed, unique
password_digest	string	not null
session_token	string	not null, indexed, unique
created_at	datetime	not null
updated_at	datetime	not null

• index on username, unique: true
• index on email, unique: true
• index on session_token, unique: true

---

column	data type	details
id	integer	not null, primary key
title	string	not null, indexed
video_url	text	not null
description	text	not null
creator_id	integer	not null, indexed, foreign key
created at	datetime	not null
updated at	datetime	not null

• index on title
• index on creator_id
• creator_id references users
• :title, uniqueness: {scope: :creator_id} in models

---

column	data type	details
id	integer	not null, primary key
like_dislike	boolean	not null
user_id	integer	not null, indexed
likeable_id	integer	not null, indexed
likeable_type	string	not null, indexed

• index on likeable_id
• index on likeable_type
• index on user_id
• user_id refers to users
• likeable_type can be comments or videos
• :user_id, uniqueness: {scope: [:likeable_id, :likeable_type]} in models

---

column	data type	details
id	integer	not null, primary
comment	text	not null
commenter_id	integer	not null, indexed, foreign key
commentable_id	integer	not null, indexed
commentable_type	string	not null ,indexed
created_at	datetime	not null
updated_at	datetime	not null

• index on video_id
• index on commenter_id
• commenter_id references users
• commentable_type can be comments or videos
• :commenter_id, uniqueness: {scope: [:commentable_id, :commentable_type]} in models