+void
+_notmuch_database_log (notmuch_database_t *notmuch,
+ const char *format, ...);
+
+void
+_notmuch_database_log_append (notmuch_database_t *notmuch,
+ const char *format, ...);
+
+unsigned long
+_notmuch_database_new_revision (notmuch_database_t *notmuch);
+