Schema

users

column name	data type	details
id	bigint	not null, primary key
username	string	not null, indexed, unique
email	string	not null, indexed, unique
img_url	string
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
• has_many :tracks
• has_many :likes
• has_many :comments

tracks

column name	data type	details
id	bigint	not null, primary key
artist_id	bigint	not null, indexed, foreign key
title	string	not null, indexed
description	text
genre	string
album_id	bigint	indexed, foreign key
source_url	string	not null, indexed, unique
image_url	string
file_type	string	not null
duration	float	not null
created_at	datetime	not null
updated_at	datetime	not null

• artist_id references users
• album_id references albums
• index on artist_id
• index on album_id
• index on title
• index on source_url, unique: true
• belongs_to :artist
• belongs_to :album
• has_many :track_likes, foreign_key: :track_id
• has_many :playlist_tracks, foreign_key: :track_id
• has_many :playlists, through: :playlist_tracks, source: :playlist
• has_many :likes, through: :track_likes, foreign_key: :track_id
• has_many :likers, through :likes

albums

column name	data type	details
id	bigint	not null, primary key
artist_id	bigint	not null, indexed, foreign key
title	string	not null, indexed
description	text
genre	string
image_url	string
release_date	datetime	not null
created_at	datetime	not null
updated_at	datetime	not null

• artist_id references users
• index on artist_id
• index on title
• has_many :tracks

playlists

column name	data type	details
id	bigint	not null, primary key
title	string	not null, indexed
description	text
genre	string
image_url	string
created_at	datetime	not null
updated_at	datetime	not null

• artist_id references users
• index on artist_id
• index on track_id
• index on title
• has_many :playlist_tracks
• has_many :tracks, through: :playlist_tracks, source: :track
• has_many :artists, through: :tracks

playlist_tracks

column name	data type	details
id	bigint	not null, primary key
playlist_id	bigint	not null, indexed, foreign key
track_id	bigint	not null, indexed, foreign key
created_at	datetime	not null
updated_at	datetime	not null

• playlist_id references playlists
• track_id references tracks
• index on playlist_id
• index on track_id
• belongs_to :playlist
• belongs_to :track

comments

column name	data type	details
id	bigint	not null, primary key
commenter_id	bigint	not null, indexed, foreign key
track_id	bigint	not null, indexed, foreign key
timestamp	float	not null
content	text	not null
created_at	datetime	not null
updated_at	datetime	not null

• commenter_id references users
• track_id references tracks
• belongs_to :commenter
• belongs_to :track

track_likes

column name	data type	details
id	bigint	not null, primary key
liker_id	bigint	not null, indexed, foreign key
track_id	bigint	not null, indexed, foreign key
created_at	datetime	not null
updated_at	datetime	not null

• liker_id references users
• track_id references tracks
• belongs_to :liker
• belongs_to :track