Cancel database after import

The database is put in cache by the 'massdb' image.

However if 'massdb-import' image import new data this cache should be cancelled.

How to do this so that it is also not reset more often that once every hour ?

Using: db.collection.watch() ?

Or it could be easier to make a 'curl' to a new entry point from the massdb-import to clear and reload the database.