diff --git a/src/wuttasync/importing/base.py b/src/wuttasync/importing/base.py
index 183c1b9..3e64546 100644
--- a/src/wuttasync/importing/base.py
+++ b/src/wuttasync/importing/base.py
@@ -923,24 +923,32 @@ class Importer:  # pylint: disable=too-many-instance-attributes,too-many-public-
                   }
               }
         """
-        objects = self.get_target_objects(source_data=source_data)
+        model_title = self.get_model_title()
+        target_title = self.handler.get_target_title()
         cached = {}
 
+        objects = self.get_target_objects(source_data=source_data)
+        log.debug("got %s %s records from target", len(objects), model_title)
+
         def cache(obj, i):  # pylint: disable=unused-argument
             data = self.normalize_target_object(obj)
             if data:
                 key = self.get_record_key(data)
+                if key in cached:
+                    log.warning(
+                        "target key was already cached (replacing) for %s: %s",
+                        model_title,
+                        key,
+                    )
                 cached[key] = {"object": obj, "data": data}
 
-        model_title = self.get_model_title()
-        target_title = self.handler.get_target_title()
         self.app.progress_loop(
             cache,
             objects,
             progress,
             message=f"Reading {model_title} data from {target_title}",
         )
-        log.debug(f"cached %s {model_title} records from target", len(cached))
+        log.debug("cached %s %s records from target", len(cached), model_title)
         return cached
 
     def get_target_objects(self, source_data=None, progress=None):