-/* Store a timestamp within the database.
- *
- * The Notmuch database will not interpret this key nor the timestamp
- * values at all. It will merely store them together and return the
- * timestamp when notmuch_database_get_timestamp is called with the
- * same value for 'key'.
- *
- * The intention is for the caller to use the timestamp to allow
- * efficient identification of new messages to be added to the
- * database. The recommended usage is as follows:
- *
- * o Read the mtime of a directory from the filesystem
- *
- * o Call add_message for all mail files in the directory
- *
- * o Call notmuch_database_set_timestamp with the path of the
- * directory as 'key' and the originally read mtime as 'value'.
- *
- * Then, when wanting to check for updates to the directory in the
- * future, the client can call notmuch_database_get_timestamp and know
- * that it only needs to add files if the mtime of the directory and
- * files are newer than the stored timestamp.