CREATE TABLE saved_tracks (
    id VARCHAR(64) PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id VARCHAR(64) REFERENCES users(id) ON DELETE CASCADE,
    instrument_id VARCHAR(64) REFERENCES instruments(id) ON DELETE CASCADE,
    sound VARCHAR(64) NOT NULL,
    next_part_to_upload INTEGER NOT NULL DEFAULT 0,
    fully_uploaded BOOLEAN NOT NULL DEFAULT FALSE,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);