Endpoint telemetry, PC Detail rework and a checked backup/restore path

shopdb/config.py

@@ -163,11 +163,14 @@ class Config:
     # three different routes, which makes it a property of the app rather than
     # of any handler.
     #
-    # 128 MB clears the largest thing anyone legitimately sends - the agent
-    # binary upload caps itself at 64 MB - with room for the multipart envelope.
+    # 256 MB clears the largest thing anyone legitimately sends - the agent
+    # binary upload caps itself at 128 MB - with room for the multipart
+    # envelope. This must stay STRICTLY ABOVE the agent cap: it bounds the
+    # whole request (file + boundaries + form fields), so setting the two
+    # equal would reject a file sitting exactly at the agent limit.
     # Over this, Werkzeug answers 413 without reading the body.
     MAX_CONTENT_LENGTH = int(
-        os.environ.get('MAX_CONTENT_LENGTH', 128 * 1024 * 1024))
+        os.environ.get('MAX_CONTENT_LENGTH', 256 * 1024 * 1024))
 
 
 class DevelopmentConfig(Config):