CREATE TABLE IF NOT EXISTS tokens (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    token VARCHAR,
    CONSTRAINT unique_token UNIQUE (token) ON CONFLICT IGNORE
);

CREATE TABLE IF NOT EXISTS seq2 (
    t1 INTEGER,
    t2 INTEGER,
    next INTEGER
);

DROP INDEX IF EXISTS seq2_t1_t2;
CREATE INDEX seq2_t1_t2 ON seq2 (t1, t2);