CREATE TABLE IF NOT EXISTS comment_likes (
  comment_id UUID NOT NULL REFERENCES comments(id) ON DELETE CASCADE,
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  PRIMARY KEY (comment_id, user_id)
);

CREATE INDEX IF NOT EXISTS comment_likes_user_id_idx
  ON comment_likes (user_id);