docs: update changelog and memory with bug fix details

- Added comprehensive CHANGELOG.txt entry documenting all 16 bug fixes
- Updated priv/static/changelog.txt with user-facing improvements
- Enhanced MEMORY.md with key learnings:
  * Task.yield_many race condition patterns
  * Enum.zip data corruption prevention
  * LiveView timer memory leak fixes
  * PubSub subscription cleanup
  * Pattern match error handling
  * Health check log silencing

Also fixed:
- Added error checking for sensor reading batch inserts

CHANGELOG.txt

@@ -1,3 +1,31 @@
+2026-03-05
+fix: comprehensive reliability audit bug fixes (16 bugs fixed)
+  - Critical (5): Task.yield_many race condition, Enum.zip data corruption, missing Alert schema fields, LiveView timer/PubSub leaks
+  - High (3): clock skew handling, nil crash in interface status, migration index naming
+  - Medium (6): race conditions, error handling, notification failures, state bleeding
+  - Infrastructure: health check log silencing, catch-all handle_info callbacks
+Files: lib/towerops/workers/device_poller_worker.ex, device_monitor_worker.ex, snmp/profiles/base.ex, alerts/alert.ex, devices.ex
+      lib/towerops_web/live/mobile_qr_live.ex, activity_feed_live.ex, agent_live/index.ex, device_live/form.ex, device_live/index.ex
+      lib/towerops_web/channels/agent_channel.ex, plugs/filter_noisy_logs.ex
+      priv/repo/migrations/20260305144327_fix_equipment_indexes_after_rename.exs
+Details:
+  - Fixed Task.yield_many returning fewer results than expected, causing silent data corruption
+  - Fixed Enum.zip in SNMP base profile truncating values when SNMP returns incomplete data
+  - Updated Alert schema with missing fields: check_id, severity, notification_sent, notification_sent_at, output
+  - Fixed memory leaks from uncancelled timers in 4 LiveViews (mobile_qr, activity_feed, agent_live)
+  - Fixed PubSub subscription leak in device form credential testing
+  - Fixed clock skew bug in needs_discovery? causing incorrect behavior with future timestamps
+  - Fixed nil crash in interface status display with proper nil handling
+  - Created migration to fix index names missed during equipment→devices table rename
+  - Fixed race condition in device monitor worker (duplicate maintenance checks, pattern match crashes)
+  - Added preload validation guard in devices.ex get_org_default_agent
+  - Improved error handling in alerts.ex (specific rescue clauses with logging)
+  - Added error logging to fire-and-forget notification tasks
+  - Fixed LiveView state bleeding between tabs (assign_new → assign)
+  - Silenced health check endpoint logs (/health, /health/time) to reduce log noise
+  - Added catch-all handle_info callbacks to prevent crashes from unexpected messages
+  - Added error checking for sensor reading batch inserts
+
 2026-02-13
 refactor: zero credo strict issues — fix all warnings, readability, nesting, aliases
 fix: broken route paths in dashboard and insights templates

lib/towerops/workers/device_poller_worker.ex

@@ -689,7 +689,19 @@ defmodule Towerops.Workers.DevicePollerWorker do
       end)
 
     # Batch insert all sensor readings
-    Snmp.create_sensor_readings_batch(reading_entries)
+    case Snmp.create_sensor_readings_batch(reading_entries) do
+      {:ok, _count} ->
+        :ok
+
+      {:error, reason} ->
+        require Logger
+
+        Logger.error(
+          "Failed to batch insert sensor readings: #{inspect(reason)}",
+          count: length(reading_entries),
+          error: reason
+        )
+    end
 
     # Process metadata updates and change detection individually
     Enum.each(poll_results, fn {sensor, result} ->

priv/static/changelog.txt

@@ -1,3 +1,12 @@
+2026-03-05 — Reliability & Performance Improvements
+* Fixed memory leaks in real-time dashboard components
+* Improved error handling for device polling and monitoring
+* Better handling of clock synchronization issues between servers
+* Fixed data corruption issues in SNMP polling
+* Reduced log noise from health check endpoints
+* Enhanced stability for alert notifications
+* Improved handling of network timeouts and failures
+
 2026-02-13 — Navigation & Visual Polish
 * Breadcrumb navigation on device detail, site detail, config timeline, and trace pages
 * Loading skeleton placeholders while data loads on the dashboard