feat(profiles): Add constraint to unsername

Make unique
Make min 3 and max 50 (in the frontend we use only 20)
Add trigger function on insert and update to add short uuid
to username if we add an already existing name.
This is needed so we can use the first part of the email on signup.

The other functions are here because migra kept adding them.
Maybe it will finally shut up about them when I add them now

supabase/migrations/20230329185408_username_constraints.sql

@@ -0,0 +1,88 @@
+CREATE UNIQUE INDEX username_unique_constraint ON public.profiles USING btree (username);
+
+ALTER TABLE "public"."profiles"
+	ADD CONSTRAINT "username_length_constraint" CHECK (((length(username) >= 3) AND (length(username) <= 50))) NOT valid;
+
+ALTER TABLE "public"."profiles" validate CONSTRAINT "username_length_constraint";
+
+ALTER TABLE "public"."profiles"
+	ADD CONSTRAINT "username_unique_constraint" UNIQUE USING INDEX "username_unique_constraint";
+
+SET check_function_bodies = OFF;
+
+CREATE OR REPLACE FUNCTION public.username_append_uuid ()
+	RETURNS TRIGGER
+	LANGUAGE plpgsql
+	AS $function$
+BEGIN
+	IF EXISTS (
+		SELECT
+			1
+		FROM
+			public.profiles
+		WHERE
+			username = NEW.username) THEN
+	NEW.username := NEW.username || '-' || TRIM(BOTH FROM SUBSTRING(
+		LEFT (CAST(uuid_generate_v4 () AS text), 8), 1, 6));
+END IF;
+	RETURN NEW;
+END;
+$function$;
+
+CREATE TRIGGER username_check_trigger
+	BEFORE INSERT OR UPDATE ON public.profiles
+	FOR EACH ROW
+	EXECUTE FUNCTION username_append_uuid ();
+
+CREATE OR REPLACE FUNCTION public.delete_user ()
+	RETURNS TRIGGER
+	LANGUAGE plpgsql
+	SECURITY DEFINER
+	AS $function$
+DECLARE
+	row_count int;
+BEGIN
+	DELETE FROM public.profiles p
+	WHERE p.id = OLD.id;
+	IF found THEN
+		GET DIAGNOSTICS row_count = ROW_COUNT;
+		RAISE NOTICE 'DELETEd % row(s) FROM profiles', row_count;
+	END IF;
+	UPDATE
+		trees_watered
+	SET
+		uuid = NULL,
+		username = NULL
+	WHERE
+		uuid = OLD.id::text;
+	DELETE FROM trees_adopted ta
+	WHERE ta.uuid = OLD.id::text;
+	RETURN OLD;
+END;
+$function$;
+
+CREATE OR REPLACE FUNCTION public.remove_account ()
+	RETURNS void
+	LANGUAGE sql
+	SECURITY DEFINER
+	AS $function$
+	DELETE FROM auth.users
+	WHERE id = auth.uid ();
+
+$function$;
+
+CREATE OR REPLACE FUNCTION public.update_username_on_trees_watered ()
+	RETURNS TRIGGER
+	LANGUAGE plpgsql
+	AS $function$
+BEGIN
+	UPDATE
+		trees_watered
+	SET
+		username = NEW.username
+	WHERE
+		uuid = OLD.id::text;
+	RETURN NEW;
+END;
+$function$;
+