Schema

Database Schema

users

column name	data type	details
id	integer	not null, primary key
username	string	not null, indexed
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 session_token, unique: true

albums

column name	data type	details
id	integer	not null, primary key
title	string	not null
artist_id	integer	not null, indexed, foreign_key
release_year	integer
created_at	datetime	not null
updated_at	datetime	not null

• index on artist_id

artists

column name	data type	details
id	integer	not null, primary key
name	string	not null
img_url	string
created_at	datetime	not null
updated_at	datetime	not null

songs

column name	data type	details
id	integer	not null, primary key
album_id	integer	not null, foreign_key, indexed
artist_id	integer	not null, foreign_key, indexed
title	string	not null
length	string	not null
created_at	datetime	not null
updated_at	datetime	not null

• index on album_id
• index on artist_id

playlists

column name	data type	details
id	integer	not null, primary key
user_id	integer	not null, foreign_key, indexed
title	string	not null
created_at	datetime	not null
updated_at	datetime	not null

• user_id references users
• index on user_id

playlist_songs

column name	data type	details
id	integer	not null, primary key
song_id	integer	not null, foreign_key, indexed
playlist_id	integer	not null, foreign_key, indexed
title	string	not null
created_at	datetime	not null
updated_at	datetime	not null

• song_id references songs
• playlist_id references playlists
• index on song_id
• index on playlist_id

follows

column name	data type	details
id	integer	not null, primary key
follower_id	integer	not null, foreign_key, indexed
followed_id	integer	not null, foreign_key, indexed
created_at	datetime	not null
updated_at	datetime	not null

• followed_id references users
• follower_id references users
• follows belongs to a user
• follower_id belongs to a user