CREATE OR REPLACE PROCEDURE public.create_tables() 
LANGUAGE SQL
AS $$
	DROP TABLE IF EXISTS artist_website;
	DROP TABLE IF EXISTS website;
	DROP TABLE IF EXISTS artist;
	
	CREATE TABLE IF NOT EXISTS artist (
		id serial PRIMARY KEY,
		name text NOT NULL,
		CONSTRAINT a_name UNIQUE(name)
	);
	
	CREATE TABLE IF NOT EXISTS website (
		id serial PRIMARY KEY,
		name text NOT NULL,
		CONSTRAINT w_name UNIQUE(name)
	);
	
	CREATE TABLE IF NOT EXISTS artist_website (
		id serial PRIMARY KEY,
		url text NOT NULL,
		folder_path text,
		website_id integer,
		artist_id integer,
		CONSTRAINT aw_url UNIQUE(url),
		CONSTRAINT aw_artist FOREIGN KEY (artist_id) REFERENCES artist (ID),
		CONSTRAINT aw_website FOREIGN KEY (website_id) REFERENCES website (ID)
	);
$$;