polling fix

CHANGELOG.txt

@@ -0,0 +1,11 @@
+CHANGELOG - towerops-web
+========================
+
+2026-02-11 - fix: update last_snmp_poll_at for agent-polled devices
+  - File: lib/towerops_web/channels/agent_channel.ex (process_polling_result/3)
+  - Bug: Devices polled by remote agents showed "Last Polled: Never" because
+    process_polling_result never called Devices.update_snmp_poll_time/1
+  - The Phoenix-side DevicePollerWorker already had this call (line 172),
+    but the agent channel path was missing it
+  - Fix: Added Devices.update_snmp_poll_time(device) at the top of
+    process_polling_result/3, matching the DevicePollerWorker pattern

CLAUDE.md

@@ -1010,4 +1010,13 @@ When writing new LiveView code or JavaScript hooks:
 - assets are rebuilt automatically on filesystem change
 - never try to run npm, it's not included in phoenix
 - assets build themselves on file change, you do not need to ever run mix assets.build
-- never write custom one-off tests, if you're going to write a test, write a proper exunit test
+- never write custom one-off tests, if you're going to write a test, write a proper exunit test
+
+## Changelog
+
+After every code change, append an entry to `CHANGELOG.txt` in the project root. Each entry must include:
+- Date (YYYY-MM-DD)
+- Short description (e.g. "fix: update last_snmp_poll_at for agent-polled devices")
+- Files changed and a brief explanation of what and why
+
+Keep entries in reverse chronological order (newest at top, below the header). Never remove existing entries.

lib/towerops_web/channels/agent_channel.ex

@@ -1303,6 +1303,8 @@ defmodule ToweropsWeb.AgentChannel do
   end
 
   defp process_polling_result(device, result, _socket) do
+    Devices.update_snmp_poll_time(device)
+
     snmp_device = device.snmp_device
     oid_values = Map.new(result.oid_values)
     # Use server time to avoid clock drift issues between agents