:recyle: providing sample generated placeholder instead

backend/db/_generated.js

-/**
- * Generated mock data to copy
- * into the db with npm run seed
- *
- * You MUST first run npm run generate!
- */
-asdfasdf

backend/db/_generated.sample.js

+/**
+ * Generated mock data to copy
+ * into the db with npm run seed
+ *
+ * You MUST first rename this file _generated.js
+ * then you can run npm run generate!
+ */