CREATE TABLE IF NOT EXISTS usernames (uid INTEGER PRIMARY KEY, username TEXT, valid INTEGER);
CREATE TABLE IF NOT EXISTS nicknames (nickname TEXT, uid INTEGER NOT NULL,
    FOREIGN KEY (uid) REFERENCES usernames(uid));
CREATE TABLE IF NOT EXISTS artists (artid INTEGER PRIMARY KEY, artist TEXT UNIQUE, TIMESTAMP INTEGER);
CREATE TABLE IF NOT EXISTS artist_tag_cache (artid INTEGER, tag TEXT,
    votes INTEGER, FOREIGN KEY (artid) REFERENCES artists(artid));