+void
+_notmuch_message_set_filename (notmuch_message_t *message,
+ const char *filename);
+
+void
+_notmuch_message_add_thread_id (notmuch_message_t *message,
+ const char *thread_id);
+
+void
+_notmuch_message_ensure_thread_id (notmuch_message_t *message);
+
+void
+_notmuch_message_set_date (notmuch_message_t *message,
+ const char *date);
+
+void
+_notmuch_message_sync (notmuch_message_t *message);
+