CREATE TABLE IF NOT EXISTS records_qualifications (
    id BIGSERIAL PRIMARY KEY NOT NULL,
    user_id BIGINT NOT NULL,
    qualification_id BIGINT NOT NULL,
    author_id BIGINT NOT NULL,
    created_at BIGINT NOT NULL,

    CONSTRAINT fk_user FOREIGN KEY(user_id) REFERENCES users(id) ON DELETE CASCADE,
    CONSTRAINT fk_author FOREIGN KEY(author_id) REFERENCES users(id) ON DELETE SET NULL,
    CONSTRAINT fk_qualification FOREIGN KEY (qualification_id) REFERENCES qualifications(id) ON DELETE CASCADE
);