Add javadocs for database.

3 jobs for !1571 with 2226-error-handling-mailbox-uploads in 9 minutes and 53 seconds (queued for 57 seconds)
latest detached
Status Name Job ID Coverage
  Test
passed test #14183

00:09:53

 
  Optional Tests
manual android test #14184
kvm allowed to fail manual
manual bridge test #14185
allowed to fail manual