fix: classify unsent upload connections and omit raw photo filenames [skip ci]

pigway_frame_flow/drivers/kokonna/client.py

@@ -10,6 +10,7 @@ from collections import deque
 from urllib.parse import quote
 
 import requests
+from urllib3.exceptions import MaxRetryError, NewConnectionError
 
 from pigway_frame_flow.errors import ErrorCode as E
 from pigway_frame_flow.errors import FlowError
@@ -124,7 +125,15 @@ class SafeTransport:
                 ),
                 "request_error",
             )
-            not_sent = isinstance(exc, requests.ConnectTimeout)
+            # A socket/DNS establishment failure precedes the HTTP write. A
+            # dropped established connection still has an uncertain outcome.
+            not_sent = isinstance(exc, requests.ConnectTimeout) or any(
+                isinstance(cause, MaxRetryError)
+                and isinstance(cause.reason, NewConnectionError)
+                for cause in exc.args
+            )
+            if not_sent and category == "connection_error":
+                category = "connect_error"
             uncertain = write and not not_sent
             raise FlowError(
                 E.WRITE_RESULT_UNKNOWN if uncertain else E.CLOUD_UNAVAILABLE,