fix: update event count retrieval logic in AchSession and MiniMateClient

minimateplus/client.py

@@ -181,8 +181,21 @@ class MiniMateClient:
         log.info("connect: reading event index (SUB 08)")
         try:
             idx_raw = proto.read_event_index()
-            device_info.event_count = _decode_event_count(idx_raw)
-            log.info("connect: device has %d stored event(s)", device_info.event_count)
+            # NOTE: _decode_event_count reads data[10:12] from the SUB 08 payload,
+            # which was believed to be the stored event count.  Empirically it turns
+            # out to be a monotonically-increasing "total events ever recorded" counter
+            # that does NOT decrement when events are erased — confirmed 2026-04-13:
+            # device reported 6 via SUB 08 while list_event_keys() returned 0 (empty).
+            # We preserve the raw read here for the index data but do NOT use this
+            # count for logic; ach_server uses list_event_keys() as the authoritative
+            # source instead.
+            _raw_idx_count = _decode_event_count(idx_raw)
+            log.info(
+                "connect: SUB 08 index count=%d (lifetime counter, not current storage)",
+                _raw_idx_count,
+            )
+            # Leave device_info.event_count as None — callers should use
+            # list_event_keys() to get the actual current event count.
         except ProtocolError as exc:
             log.warning("connect: event index read failed: %s — continuing", exc)