support limit

db/install.go

@@ -12,9 +12,10 @@ func install() {
 	}
 
 	_, err = tx.Exec(`
-	CREATE TABLE timetables (
+CREATE TABLE timetables (
 	id serial primary key,
 	"name" text NOT NULL,
+	"limit" integer NOT NULL DEFAULT 1,
 	status bool NOT NULL DEFAULT false,
 	created timestamp NOT NULL DEFAULT now()
 );