CREATE TABLE users_t (
    id INTEGER AUTO_INCREMENT,
    username VARCHAR(25) NOT NULL,
    pw VARCHAR(512) NOT NULL,
    super INT(1) NOT NULL DEFAULT 0,
    PRIMARY KEY (id)
);
CREATE UNIQUE INDEX users_username ON users_t (username);

CREATE OR REPLACE VIEW users AS
  SELECT username, pw, super
    FROM users_t;

CREATE TABLE acls_t (
    id INTEGER AUTO_INCREMENT,
    user INTEGER NOT NULL,
    topic VARCHAR(256) NOT NULL,
    -- rw, bitmask: 1 is read, 2 is write, 3 is readwrite, 4 is subscribe
    rw INTEGER(1) NOT NULL DEFAULT 1,	
    PRIMARY KEY (id),
    CONSTRAINT `fk_user_acl`
      FOREIGN KEY (user) REFERENCES users_t (id)
      ON DELETE CASCADE
      ON UPDATE CASCADE
    );
CREATE UNIQUE INDEX acls_user_topic ON acls_t (user, topic);

CREATE OR REPLACE VIEW acls AS
  SELECT a.topic, a.rw,
         u.username
    FROM users_t u, acls_t a
    WHERE a.user = u.id;