Add UI for defining default roles

src/db/migrations/0035-role-default.sql

@@ -0,0 +1,9 @@
+BEGIN TRANSACTION;
+
+CREATE TABLE "role_default" (
+	"guild_id"	TEXT NOT NULL,
+	"role_id"	TEXT NOT NULL,
+	PRIMARY KEY ("guild_id", "role_id")
+);
+
+COMMIT;

src/db/orm-defs.d.ts

@@ -104,6 +104,11 @@ export type Models = {
 		historical_room_index: number
 	}
 
+	role_default: {
+		guild_id: string
+		role_id: string
+	}
+
 	room_upgrade_pending: {
 		new_room_id: string
 		old_room_id: string