CREATE TABLE IF NOT EXISTS user (
    id integer NOT NULL PRIMARY KEY AUTOINCREMENT,
    nick varchar(255) NOT NULL,
    channel varchar(255) NOT NULL,
    reply_chance real NOT NULL
);

CREATE UNIQUE INDEX IF NOT EXISTS user_nick_channel ON user(nick, channel);

CREATE TABLE IF NOT EXISTS chain (
    id integer NOT NULL PRIMARY KEY AUTOINCREMENT,
    user integer NOT NULL,
    value text NOT NULL,
    weight integer NOT NULL DEFAULT 1,
    next text NOT NULL,
    FOREIGN KEY(user) REFERENCES user(id)
);

CREATE UNIQUE INDEX IF NOT EXISTS chain_value_next ON chain(user, value, next);