Database ID is a locally public random byte array that can be used by the apps using this
library to identify the database file. For example, if the app stores passwords externally
(e.g. fingerprint biometric) it can do so under the DATABASE_ID as key. Note that the
RepositoryId could - in theory - also be used for this purpose, but in case the
database IDs are leaked to an adversary without the actual database files, the adversary
will not be able to link the DATABASE_ID to a corresponding repository. For that reason
database IDs may be preferable.