Database

We use SQLite for our database. See https://www.sqlite.org/index.html for documentation.

Note

Developer tooling expects that the data directory is in repertoire/data. The yoyo database migration tool (for developers) is configured to also look in that directory for the database.

Why SQLite

We chose SQLite as our database over a more full-featured offering (e.g. PostgreSQL, MySQL) primarily to keep the application as simple as possible.

The more full-featured databases run as separate services, whereas SQLite is embedded within the application. The SQLite database is also a single file, and thus easy to back up and move.

Since this application is intended for individual and small-group use, the performance of SQLite is more than sufficient. And while a few features would be nice to have (e.g. materialized views, stored procedures), we can still live comfortably on what SQLite offers.

Search Index

We use SQLite’s FTS5 virtual tables for our search index. To keep the search index in sync with the database content, we have a set of triggers defined in the database. These are written in and applied via the database migrations.

See https://www.sqlite.org/fts5.html for an overview of FTS5.

Note

SQLite does not support stored procedures, yet the triggers that maintain the search index state share logic. Thus, our trigger SQL is heavily duplicated. Please bear with it~

Migrations

Database migrations are handled with the yoyo-migrations package. We invoke this package in the module-level scope of backend/src/__init__.py to automatically perform any pending migrations when repertoire is run.

Migrations are stored in backend/src/migrations.

Warning

Commands such as yoyo reapply can cause data loss. Be very careful if developing on a production instance.

Schema

The DB schema is included below.

CREATE TABLE music__releases (
    id INTEGER PRIMARY KEY,
    title VARCHAR COLLATE 'NOCASE' NOT NULL,
    release_type INTEGER NOT NULL REFERENCES music__release_types__enum(id) DEFAULT 1,
    release_year INTEGER,
    release_date DATE,
    image_id INTEGER REFERENCES images(id),
    added_on TIMESTAMP DEFAULT (CURRENT_TIMESTAMP) NOT NULL,
    rating INTEGER CHECK (rating >= 1 AND rating <=10)
);

CREATE INDEX music__releases__title__idx ON music__releases (title);

CREATE INDEX music__releases__release_type__idx ON music__releases (release_type);

CREATE INDEX music__releases__added_on__idx ON music__releases (added_on);

CREATE INDEX music__releases__release_year__idx ON music__releases (release_year);

CREATE INDEX music__releases__rating__idx ON music__releases (rating);

CREATE TABLE music__release_types__enum (
    id INTEGER PRIMARY KEY,
    type VARCHAR UNIQUE NOT NULL
);

CREATE TABLE music__artists (
    id INTEGER PRIMARY KEY,
    name VARCHAR COLLATE 'NOCASE' NOT NULL
);

CREATE TABLE music__artists_starred (
    user_id INTEGER REFERENCES system__users(id) ON DELETE CASCADE,
    artist_id INTEGER REFERENCES music__artists(id) ON DELETE CASCADE,
    PRIMARY KEY (user_id, artist_id)
);

CREATE TABLE music__artist_roles__enum (
    id INTEGER PRIMARY KEY,
    role VARCHAR UNIQUE NOT NULL
);

CREATE TABLE music__releases_artists (
    release_id INTEGER REFERENCES music__releases(id) ON DELETE CASCADE,
    artist_id INTEGER REFERENCES music__artists(id) ON DELETE CASCADE,
    role INTEGER REFERENCES music__artist_roles__enum (id),
    PRIMARY KEY (release_id, artist_id, role)
);

CREATE TABLE music__tracks (
    id INTEGER PRIMARY KEY,
    filepath VARCHAR UNIQUE NOT NULL,
    -- The SHA256 of the full track. This is initially NULL for efficiency, but
    -- eventually becomes NOT NULL.
    sha256 BLOB UNIQUE,
    -- The SHA256 of the first 1KB of the track.
    sha256_initial BLOB NOT NULL,
    title VARCHAR COLLATE 'NOCASE' NOT NULL DEFAULT 'Untitled',
    release_id INTEGER NOT NULL REFERENCES music__releases(id) DEFAULT 1,
    track_number VARCHAR NOT NULL DEFAULT '1',
    disc_number VARCHAR NOT NULL DEFAULT '1',
    duration INTEGER NOT NULL
);

CREATE INDEX music__tracks__disc_track_numbers__idx
    ON music__tracks (disc_number, track_number);

CREATE TABLE music__tracks_artists (
    track_id INTEGER REFERENCES music__tracks (id) ON DELETE CASCADE,
    artist_id INTEGER REFERENCES music__artists (id) ON DELETE CASCADE,
    role INTEGER REFERENCES music__artist_roles__enum (id),
    PRIMARY KEY (track_id, artist_id, role)
);

CREATE TABLE music__collections (
    id INTEGER PRIMARY KEY,
    name VARCHAR COLLATE 'NOCASE' NOT NULL,
    type INTEGER NOT NULL REFERENCES music__collection_types__enum(id),
    user_id INTEGER REFERENCES system__users(id) ON DELETE CASCADE,
    last_updated_on TIMESTAMP DEFAULT (CURRENT_TIMESTAMP) NOT NULL,
    UNIQUE (name, type, user_id),
    -- Assert that all System & Personal collections have a user ID attached.
    CHECK (type NOT IN (1, 2) OR user_id IS NOT NULL)
);

CREATE INDEX music__collections__sorting__idx
    ON music__collections (type, name);

CREATE TABLE music__collections_starred (
    user_id INTEGER REFERENCES system__users(id) ON DELETE CASCADE,
    collection_id INTEGER REFERENCES music__collections(id) ON DELETE CASCADE,
    PRIMARY KEY (user_id, collection_id)
);

CREATE TABLE music__collection_types__enum (
    id INTEGER PRIMARY KEY,
    type VARCHAR UNIQUE NOT NULL
);

CREATE TABLE music__collections_releases (
    collection_id INTEGER REFERENCES music__collections(id) ON DELETE CASCADE,
    release_id INTEGER REFERENCES music__releases(id) ON DELETE CASCADE,
    added_on TIMESTAMP NOT NULL DEFAULT (CURRENT_TIMESTAMP),
    PRIMARY KEY (release_id, collection_id)
);

CREATE TABLE music__playlists (
    id INTEGER PRIMARY KEY,
    name VARCHAR COLLATE 'NOCASE' NOT NULL,
    type INTEGER NOT NULL REFERENCES music__playlist_types__enum(id),
    user_id INTEGER REFERENCES system__users(id) ON DELETE CASCADE,
    last_updated_on TIMESTAMP DEFAULT (CURRENT_TIMESTAMP) NOT NULL,
    UNIQUE (name, type, user_id),
    -- Assert that all System & Personal playlists have a user ID attached.
    CHECK (type NOT IN (1, 2) OR user_id IS NOT NULL)
);

CREATE INDEX music__playlists__sorting__idx
    ON music__playlists (type, name);

CREATE TABLE music__playlists_starred (
    user_id INTEGER REFERENCES system__users(id) ON DELETE CASCADE,
    playlist_id INTEGER REFERENCES music__playlists(id) ON DELETE CASCADE,
    PRIMARY KEY (user_id, playlist_id)
);

CREATE TABLE music__playlist_types__enum (
    id INTEGER PRIMARY KEY,
    type VARCHAR UNIQUE NOT NULL
);

CREATE TABLE music__playlists_tracks (
    id INTEGER PRIMARY KEY,
    playlist_id INTEGER NOT NULL REFERENCES music__playlists(id) ON DELETE CASCADE,
    track_id INTEGER NOT NULL REFERENCES music__tracks(id) ON DELETE CASCADE,
    added_on TIMESTAMP DEFAULT (CURRENT_TIMESTAMP) NOT NULL,
    position INTEGER NOT NULL
);

CREATE INDEX music__playlists_tracks__playlist_position__idx
    ON music__playlists_tracks (playlist_id, position);

CREATE TABLE images (
    id INTEGER PRIMARY KEY,
    path VARCHAR UNIQUE NOT NULL
);

CREATE TABLE music__releases_images_to_fetch (
    release_id INTEGER PRIMARY KEY REFERENCES music__releases(id) ON DELETE CASCADE
);

CREATE TABLE system__users (
    id INTEGER PRIMARY KEY,
    nickname VARCHAR NOT NULL,
    token_prefix BLOB UNIQUE NOT NULL,
    token_hash VARCHAR NOT NULL,
    csrf_token BLOB NOT NULL
);

CREATE TABLE system__invites (
    id INTEGER PRIMARY KEY,
    code BLOB UNIQUE NOT NULL,
    created_by INTEGER NOT NULL,
    created_at TIMESTAMP DEFAULT (CURRENT_TIMESTAMP) NOT NULL,
    used_by INTEGER REFERENCES system__users(id)
);

CREATE TABLE system__secret_key (
    key BLOB PRIMARY KEY
);

CREATE TABLE system__config (
    key VARCHAR PRIMARY KEY,
    value VARCHAR
);

CREATE VIEW music__releases__fts_content AS
    SELECT
        rls.id AS id,
        rls.title AS title,
        GROUP_CONCAT(arts.name, " ") AS artists
    FROM music__releases AS rls
    LEFT JOIN music__releases_artists AS rlsarts ON rlsarts.release_id = rls.id
    LEFT JOIN music__artists AS arts ON arts.id = rlsarts.artist_id
    GROUP BY rls.id
/* music__releases__fts_content(id,title,artists) */;

CREATE VIRTUAL TABLE music__releases__fts USING fts5(
    title,
    artists,
    content='music__releases__fts_content',
    content_rowid='id',
    tokenize='trigram'
)
/* music__releases__fts(title,artists) */;

CREATE TABLE IF NOT EXISTS 'music__releases__fts_data'(id INTEGER PRIMARY KEY, block BLOB);

CREATE TABLE IF NOT EXISTS 'music__releases__fts_idx'(segid, term, pgno, PRIMARY KEY(segid, term)) WITHOUT ROWID;

CREATE TABLE IF NOT EXISTS 'music__releases__fts_docsize'(id INTEGER PRIMARY KEY, sz BLOB);

CREATE TABLE IF NOT EXISTS 'music__releases__fts_config'(k PRIMARY KEY, v) WITHOUT ROWID;

CREATE TRIGGER music__releases__fts__release_insert
    AFTER INSERT ON music__releases
    FOR EACH ROW
    BEGIN
        INSERT INTO music__releases__fts (rowid, title, artists)
        SELECT id, title, artists FROM music__releases__fts_content WHERE id = new.id;
    END;

CREATE TRIGGER music__releases__fts__release_delete
    BEFORE DELETE ON music__releases
    FOR EACH ROW
    BEGIN
        INSERT INTO music__releases__fts (music__releases__fts, rowid, title, artists)
        SELECT 'delete', rowid, title, artists FROM music__releases__fts WHERE rowid = old.id;
    END;

CREATE TRIGGER music__releases__fts__release_update_pre
    BEFORE UPDATE ON music__releases
    FOR EACH ROW
    BEGIN
        INSERT INTO music__releases__fts (music__releases__fts, rowid, title, artists)
        SELECT 'delete', rowid, title, artists FROM music__releases__fts WHERE rowid = old.id;
    END;

CREATE TRIGGER music__releases__fts__release_update_post
    AFTER UPDATE ON music__releases
    FOR EACH ROW
    BEGIN
        INSERT INTO music__releases__fts (rowid, title, artists)
        SELECT id, title, artists FROM music__releases__fts_content WHERE id = new.id;
    END;

CREATE TRIGGER music__releases__fts__artist_insert_pre
    BEFORE INSERT ON music__releases_artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__releases__fts (music__releases__fts, rowid, title, artists)
        SELECT 'delete', rowid, title, artists FROM music__releases__fts WHERE rowid = new.release_id;
    END;

CREATE TRIGGER music__releases__fts__artist_insert_post
    AFTER INSERT ON music__releases_artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__releases__fts (rowid, title, artists)
        SELECT id, title, artists FROM music__releases__fts_content WHERE id = new.release_id;
    END;

CREATE TRIGGER music__releases__fts__artist_delete_pre
    BEFORE DELETE ON music__releases_artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__releases__fts (music__releases__fts, rowid, title, artists)
        SELECT 'delete', rowid, title, artists FROM music__releases__fts WHERE rowid = old.release_id;
    END;

CREATE TRIGGER music__releases__fts__artist_delete_post
    AFTER DELETE ON music__releases_artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__releases__fts (rowid, title, artists)
        SELECT id, title, artists FROM music__releases__fts_content WHERE id = old.release_id;
    END;

CREATE TRIGGER music__releases__fts__artist_update_pre
    BEFORE UPDATE ON music__releases_artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__releases__fts (music__releases__fts, rowid, title, artists)
        SELECT 'delete', rowid, title, artists FROM music__releases__fts WHERE rowid = old.release_id;
    END;

CREATE TRIGGER music__releases__fts__artist_update_post
    AFTER UPDATE ON music__releases_artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__releases__fts (rowid, title, artists)
        SELECT id, title, artists FROM music__releases__fts_content WHERE id = new.release_id;
    END;

CREATE VIRTUAL TABLE music__artists__fts USING fts5(
    name,
    content='music__artists',
    content_rowid='id',
    tokenize='trigram'
)
/* music__artists__fts(name) */;

CREATE TABLE IF NOT EXISTS 'music__artists__fts_data'(id INTEGER PRIMARY KEY, block BLOB);

CREATE TABLE IF NOT EXISTS 'music__artists__fts_idx'(segid, term, pgno, PRIMARY KEY(segid, term)) WITHOUT ROWID;

CREATE TABLE IF NOT EXISTS 'music__artists__fts_docsize'(id INTEGER PRIMARY KEY, sz BLOB);

CREATE TABLE IF NOT EXISTS 'music__artists__fts_config'(k PRIMARY KEY, v) WITHOUT ROWID;

CREATE TRIGGER music__artists__fts__insert
    AFTER INSERT ON music__artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__artists__fts (rowid, name) VALUES (new.id, new.name);
    END;

CREATE TRIGGER music__artists__fts__delete
    AFTER DELETE ON music__artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__artists__fts (music__artists__fts, rowid, name)
        VALUES ('delete', old.id, old.name);
    END;

CREATE TRIGGER music__artists__fts__update
    AFTER UPDATE ON music__artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__artists__fts (music__artists__fts, rowid, name)
        VALUES ('delete', old.id, old.name);

        INSERT INTO music__artists__fts (rowid, name) VALUES (new.id, new.name);
    END;

CREATE VIEW music__tracks__fts_content AS
    SELECT
        trks.id AS id,
        trks.title AS title,
        GROUP_CONCAT(arts.name, " ") AS artists
    FROM music__tracks AS trks
    LEFT JOIN music__tracks_artists AS trksarts ON trksarts.track_id = trks.id
    LEFT JOIN music__artists AS arts ON arts.id = trksarts.artist_id
    GROUP BY trks.id
/* music__tracks__fts_content(id,title,artists) */;

CREATE VIRTUAL TABLE music__tracks__fts USING fts5(
    title,
    artists,
    content='music__tracks__fts_content',
    content_rowid='id',
    tokenize='trigram'
)
/* music__tracks__fts(title,artists) */;

CREATE TABLE IF NOT EXISTS 'music__tracks__fts_data'(id INTEGER PRIMARY KEY, block BLOB);

CREATE TABLE IF NOT EXISTS 'music__tracks__fts_idx'(segid, term, pgno, PRIMARY KEY(segid, term)) WITHOUT ROWID;

CREATE TABLE IF NOT EXISTS 'music__tracks__fts_docsize'(id INTEGER PRIMARY KEY, sz BLOB);

CREATE TABLE IF NOT EXISTS 'music__tracks__fts_config'(k PRIMARY KEY, v) WITHOUT ROWID;

CREATE TRIGGER music__tracks__fts__track_insert
    AFTER INSERT ON music__tracks
    FOR EACH ROW
    BEGIN
        INSERT INTO music__tracks__fts (rowid, title, artists)
        SELECT id, title, artists FROM music__tracks__fts_content WHERE id = new.id;
    END;

CREATE TRIGGER music__tracks__fts__track_delete
    BEFORE DELETE ON music__tracks
    FOR EACH ROW
    BEGIN
        INSERT INTO music__tracks__fts (music__tracks__fts, rowid, title, artists)
        SELECT 'delete', rowid, title, artists FROM music__tracks__fts WHERE rowid = old.id;
    END;

CREATE TRIGGER music__tracks__fts__track_update_pre
    BEFORE UPDATE ON music__tracks
    FOR EACH ROW
    BEGIN
        INSERT INTO music__tracks__fts (music__tracks__fts, rowid, title, artists)
        SELECT 'delete', rowid, title, artists FROM music__tracks__fts WHERE rowid = old.id;
    END;

CREATE TRIGGER music__tracks__fts__track_update_post
    AFTER UPDATE ON music__tracks
    FOR EACH ROW
    BEGIN
        INSERT INTO music__tracks__fts (rowid, title, artists)
        SELECT id, title, artists FROM music__tracks__fts_content WHERE id = new.id;
    END;

CREATE TRIGGER music__tracks__fts__artist_insert_pre
    BEFORE INSERT ON music__tracks_artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__tracks__fts (music__tracks__fts, rowid, title, artists)
        SELECT 'delete', rowid, title, artists FROM music__tracks__fts WHERE rowid = new.track_id;
    END;

CREATE TRIGGER music__tracks__fts__artist_insert_post
    AFTER INSERT ON music__tracks_artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__tracks__fts (rowid, title, artists)
        SELECT id, title, artists FROM music__tracks__fts_content WHERE id = new.track_id;
    END;

CREATE TRIGGER music__tracks__fts__artist_delete_pre
    BEFORE DELETE ON music__tracks_artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__tracks__fts (music__tracks__fts, rowid, title, artists)
        SELECT 'delete', rowid, title, artists FROM music__tracks__fts WHERE rowid = old.track_id;
    END;

CREATE TRIGGER music__tracks__fts__artist_delete_post
    AFTER DELETE ON music__tracks_artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__tracks__fts (rowid, title, artists)
        SELECT id, title, artists FROM music__tracks__fts_content WHERE id = old.track_id;
    END;

CREATE TRIGGER music__tracks__fts__artist_update_pre
    BEFORE UPDATE ON music__tracks_artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__tracks__fts (music__tracks__fts, rowid, title, artists)
        SELECT 'delete', rowid, title, artists FROM music__tracks__fts WHERE rowid = old.track_id;
    END;

CREATE TRIGGER music__tracks__fts__artist_update_post
    AFTER UPDATE ON music__tracks_artists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__tracks__fts (rowid, title, artists)
        SELECT id, title, artists FROM music__tracks__fts_content WHERE id = new.track_id;
    END;

CREATE VIRTUAL TABLE music__collections__fts USING fts5(
    name,
    content='music__collections',
    content_rowid='id',
    tokenize='trigram'
)
/* music__collections__fts(name) */;

CREATE TABLE IF NOT EXISTS 'music__collections__fts_data'(id INTEGER PRIMARY KEY, block BLOB);

CREATE TABLE IF NOT EXISTS 'music__collections__fts_idx'(segid, term, pgno, PRIMARY KEY(segid, term)) WITHOUT ROWID;

CREATE TABLE IF NOT EXISTS 'music__collections__fts_docsize'(id INTEGER PRIMARY KEY, sz BLOB);

CREATE TABLE IF NOT EXISTS 'music__collections__fts_config'(k PRIMARY KEY, v) WITHOUT ROWID;

CREATE TRIGGER music__collections__fts__insert
    AFTER INSERT ON music__collections
    FOR EACH ROW
    BEGIN
        INSERT INTO music__collections__fts (rowid, name) VALUES (new.id, new.name);
    END;

CREATE TRIGGER music__collections__fts__delete
    AFTER DELETE ON music__collections
    FOR EACH ROW
    BEGIN
        INSERT INTO music__collections__fts (music__collections__fts, rowid, name)
        VALUES ('delete', old.id, old.name);
    END;

CREATE TRIGGER music__collections__fts__update
    AFTER UPDATE ON music__collections
    FOR EACH ROW
    BEGIN
        INSERT INTO music__collections__fts (music__collections__fts, rowid, name)
        VALUES ('delete', old.id, old.name);

        INSERT INTO music__collections__fts (rowid, name) VALUES (new.id, new.name);
    END;

CREATE VIRTUAL TABLE music__playlists__fts USING fts5(
    name,
    content='music__playlists',
    content_rowid='id',
    tokenize='trigram'
)
/* music__playlists__fts(name) */;

CREATE TABLE IF NOT EXISTS 'music__playlists__fts_data'(id INTEGER PRIMARY KEY, block BLOB);

CREATE TABLE IF NOT EXISTS 'music__playlists__fts_idx'(segid, term, pgno, PRIMARY KEY(segid, term)) WITHOUT ROWID;

CREATE TABLE IF NOT EXISTS 'music__playlists__fts_docsize'(id INTEGER PRIMARY KEY, sz BLOB);

CREATE TABLE IF NOT EXISTS 'music__playlists__fts_config'(k PRIMARY KEY, v) WITHOUT ROWID;

CREATE TRIGGER music__playlists__fts__insert
    AFTER INSERT ON music__playlists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__playlists__fts (rowid, name) VALUES (new.id, new.name);
    END;

CREATE TRIGGER music__playlists__fts__delete
    AFTER DELETE ON music__playlists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__playlists__fts (music__playlists__fts, rowid, name)
        VALUES ('delete', old.id, old.name);
    END;

CREATE TRIGGER music__playlists__fts__update
    AFTER UPDATE ON music__playlists
    FOR EACH ROW
    BEGIN
        INSERT INTO music__playlists__fts (music__playlists__fts, rowid, name)
        VALUES ('delete', old.id, old.name);

        INSERT INTO music__playlists__fts (rowid, name) VALUES (new.id, new.name);
    END;

CREATE INDEX music__artists_starred__user_id__idx ON music__artists_starred (user_id);

CREATE INDEX music__artists_starred__artist_id__idx ON music__artists_starred (artist_id);

CREATE INDEX music__releases_artists__release_id__idx ON music__releases_artists (release_id);

CREATE INDEX music__releases_artists__artist_id__idx ON music__releases_artists (artist_id);

CREATE INDEX music__tracks__sha256__idx ON music__tracks (sha256);

CREATE INDEX music__tracks__sha256_initial__idx ON music__tracks (sha256_initial);

CREATE INDEX music__tracks__filepath__idx ON music__tracks (filepath);

CREATE INDEX music__tracks__release_id__idx ON music__tracks (release_id);

CREATE INDEX music__tracks_artists__track_id__idx ON music__tracks_artists (track_id);

CREATE INDEX music__tracks_artists__artist_id__idx ON music__tracks_artists (artist_id);

CREATE INDEX music__collections__type__idx ON music__collections (type);

CREATE INDEX music__collections__last_updated_on__idx ON music__collections (last_updated_on);

CREATE INDEX music__collections__user_id__idx ON music__collections (user_id);

CREATE INDEX music__collections__user_id__type__idx ON music__collections (user_id, type);

CREATE INDEX music__collections__user_id__last_updated_on__idx ON music__collections (user_id, last_updated_on);

CREATE INDEX music__collections_starred__user_id__idx ON music__collections_starred (user_id);

CREATE INDEX music__collections_starred__collection_id__idx ON music__collections_starred (collection_id);

CREATE INDEX music__collections_releases__collection_id__idx ON music__collections_releases (collection_id);

CREATE INDEX music__collections_releases__release_id__idx ON music__collections_releases (release_id);

CREATE INDEX music__collections_releases__collection_id__added_on__idx ON music__collections_releases (collection_id, added_on);

CREATE INDEX music__playlists__type__idx ON music__playlists (type);

CREATE INDEX music__playlists__last_updated_on__idx ON music__playlists (last_updated_on);

CREATE INDEX music__playlists__user_id__idx ON music__playlists (user_id);

CREATE INDEX music__playlists__user_id__type__idx ON music__playlists (user_id, type);

CREATE INDEX music__playlists__user_id__last_updated_on__idx ON music__playlists (user_id, last_updated_on);

CREATE INDEX music__playlists_starred__user_id__idx ON music__playlists_starred (user_id);

CREATE INDEX music__playlists_starred__playlist_id__idx ON music__playlists_starred (playlist_id);

CREATE INDEX music__playlists_tracks__playlist_id__idx ON music__playlists_tracks (playlist_id);

CREATE INDEX music__playlists_tracks__track_id__idx ON music__playlists_tracks (track_id);

CREATE INDEX music__playlists_tracks__playlist_id__added_on__idx ON music__playlists_tracks (playlist_id, added_on);