fix(get_config): strip timestamped event-log lines from running-config

TP-Link embeds system event log entries (link up/down, etc.) in
show running-config output. These change every event and cause false-
positive config-change detections. Strip lines matching #YYYY-MM-DD.

napalm_tplink_jetstream/tplink_jetstream.py

@@ -522,6 +522,19 @@ class TPLinkJetstreamDriver(ConfigLifecycleMixin, SwitchDriver):
 
         return interfaces_ip
 
+    @staticmethod
+    def _strip_event_log(config: str) -> str:
+        """Remove timestamped event-log lines from config output.
+
+        TP-Link Jetstream embeds system event log entries in ``show running-config``
+        output as lines like ``#2026-06-29 14:58:50,[Link]/5/Gi1/0/4 changed state``.
+        These lines are volatile and cause false-positive config-change events in
+        the config-backup feature.  Strip them to keep the diff meaningful.
+        """
+        import re
+
+        return re.sub(r"^#\d{4}-\d{2}-\d{2} .*\n?", "", config, flags=re.MULTILINE)
+
     def get_config(
         self,
         retrieve: str = "all",
@@ -537,10 +550,10 @@ class TPLinkJetstreamDriver(ConfigLifecycleMixin, SwitchDriver):
         configs = {"running": "", "startup": "", "candidate": ""}
 
         if retrieve in ("all", "running"):
-            configs["running"] = self._send_command("show running-config")
+            configs["running"] = self._strip_event_log(self._send_command("show running-config"))
 
         if retrieve in ("all", "startup"):
-            configs["startup"] = self._send_command("show startup-config")
+            configs["startup"] = self._strip_event_log(self._send_command("show startup-config"))
 
         if sanitized:
             configs = napalm_helpers.sanitize_configs(configs, C.CISCO_SANITIZE_FILTERS)