Allow empty primary keys
error: sql error in following statement:
ALTER TABLE "public"."article" ADD CONSTRAINT "article-primary_key" PRIMARY KEY ();
sql error: syntax error at or near ")" (Error Code: 42601)
error: sql error in following statement:
ALTER TABLE "public"."article" ADD CONSTRAINT "article-primary_key" PRIMARY KEY ();
sql error: syntax error at or near ")" (Error Code: 42601)