Print running dataset count after each received record in client.py

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client.py

@@ -35,6 +35,7 @@ def main() -> None:
 
     print("Connected. Waiting for data (Ctrl-C to quit).\n", flush=True)
     buf = ""
+    count = 0
     try:
         with sock:
             while True:
@@ -50,8 +51,9 @@ def main() -> None:
                         continue
                     try:
                         data = json.loads(line)
+                        count += 1
                         print(json.dumps(data, indent=2))
-                        print("-" * 60, flush=True)
+                        print(f"--- #{count} ", "-" * 50, flush=True)
                     except json.JSONDecodeError as e:
                         print(f"[invalid JSON] {e}: {line!r}", file=sys.stderr)
     except KeyboardInterrupt: