I start to code simple, but useful block, that allows user to receive a digest of recent course changes. This is very useful for the student, participating in dynamically evolving courses.
This block needs database table to save subscribers list.
Will this table backuped and restored automatically, or I need write special code to do that (and where I need to write such code if applicable). Modules have backuplib/restorelib files, but what can do block?