How to bind ContentProvider to attached file?

Question

Android

Good.
There is a ContentProvider, the values ​​are stored in sqlite, except for text fields, an image is attached to each entry.
Suppose that a link to an image is stored in the content provider, but it is somehow unprofitable to load it constantly from the server, the cache is also not cool, I would like to save it permanently, and then I had a problem, I can’t figure out how and where to download and delete image after the record content provider is deleted or changed.
PS I am familiar with the development for android 17 hours, sorry if something is wrong.