CREATE TABLE IF NOT EXISTS channel (
    id integer NOT NULL PRIMARY KEY AUTOINCREMENT,
    guild_id integer NOT NULL,
    channel_id integer NOT NULL,
    /* last_message needs to be set to 1420070400.0, which is Jan 1 2015 */
    last_message decimal NOT NULL DEFAULT 1420070400.0
);

CREATE UNIQUE INDEX IF NOT EXISTS unique_channel ON channel(channel_id);

CREATE TABLE IF NOT EXISTS user (
    id integer NOT NULL PRIMARY KEY AUTOINCREMENT,
    guild_id integer NOT NULL,
    member_id integer NOT NULL,
    reply_chance real NOT NULL,
    listen integer NOT NULL DEFAULT 1
);

CREATE UNIQUE INDEX IF NOT EXISTS guild_member ON user(guild_id, member_id);

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);