# Variables
DnoteDirName is the name of the directory containing dnote files.
SystemCipherKey is the encryption key.
SystemLastMaxUSN is the user's max_usn from the server at the alst sync.
SystemLastSyncAt is the timestamp of the server at the last sync.
SystemLastUpgrade is the timestamp at which the system more recently checked for an upgrade.
SystemRemoteSchema is the key for remote schema in the system table.
SystemSchema is the key for schema in the system table.
SystemSessionKey is the session key.
SystemSessionKeyExpiry is the timestamp at which the session key will expire.
# Interfaces
SQLCommon is the minimal interface required by a db connection.