Log when closing DB.

etiquette/photodb.py

@@ -1676,6 +1676,7 @@ class PhotoDB(
             return f'PhotoDB(data_directory={self.data_directory})'
 
     def close(self) -> None:
+        log.debug('Closing PhotoDB.')
         super().close()
 
         if getattr(self, 'ephemeral', False):

frontends/etiquette_flask/etiquette_flask_dev.py

@@ -68,7 +68,9 @@ def etiquette_flask_launch(
         http.serve_forever()
     except KeyboardInterrupt:
         log.info('Goodbye')
-        return 0
+
+    backend.common.P.close()
+    return 0
 
 def etiquette_flask_launch_argparse(args):
     return etiquette_flask_launch(