ALTER TABLE elon_tweets DROP CONSTRAINT elon_tweets_pkey;
ALTER TABLE elon_tweets ADD COLUMN id uuid PRIMARY KEY DEFAULT gen_random_uuid();
CREATE UNIQUE INDEX index_elon_tweets_on_twitter_id ON elon_tweets (twitter_id);
ALTER TABLE users DROP CONSTRAINT users_pkey;
ALTER TABLE users ADD COLUMN id uuid PRIMARY KEY DEFAULT gen_random_uuid();
ALTER TABLE users ALTER COLUMN twitter_id TYPE CHARACTER VARYING(256);
ALTER TABLE users ALTER COLUMN twitter_id SET NOT NULL;
CREATE UNIQUE INDEX index_users_on_twitter_id ON users (twitter_id);