local schema = [[
CREATE TABLE IF NOT EXISTS User (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    nick TEXT NOT NULL,
    name TEXT NOT NULL,
    salt TEXT,
    hash TEXT
);
CREATE TABLE IF NOT EXISTS Project (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    desc TEXT
);
CREATE TABLE IF NOT EXISTS Membership (
    proj_id INTEGER REFERENCES Project(id),
    user_id INTEGER REFERENCES User(id),
    PRIMARY KEY(proj_id, user_id)
);
CREATE TABLE IF NOT EXISTS State (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    desc TEXT
);
CREATE TABLE IF NOT EXISTS Ticket (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    proj_id INTEGER NOT NULL REFERENCES Project(id),
    user_id INTEGER NOT NULL REFERENCES User(id),
    time INTEGER NOT NULL,
    code INTEGER NOT NULL,
    name TEXT NOT NULL,
    desc TEXT
);
CREATE TABLE IF NOT EXISTS Shift (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    ticket_id INTEGER NOT NULL REFERENCES Ticket(id),
    old_stt_id INTEGER NOT NULL REFERENCES State(id),
    new_stt_id INTEGER NOT NULL REFERENCES State(id),
    user_id INTEGER NOT NULL REFERENCES User(id),
    time INTEGER NOT NULL
);
CREATE TABLE IF NOT EXISTS Comment (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    ticket_id INTEGER NOT NULL REFERENCES Ticket(id),
    user_id INTEGER NOT NULL REFERENCES User(id),
    time INTEGER NOT NULL,
    text TEXT NOT NULL
);
]]

return {schema=schema}