fix/overall-traffic-graph-data (#125)

Reviewed-on: graham/towerops-web#125

lib/towerops_web/live/device_live/show.ex

@@ -1204,8 +1204,10 @@ defmodule ToweropsWeb.DeviceLive.Show do
 
   # Calculate BPS per interface first, then aggregate by timestamp
   # This avoids issues with misaligned timestamps between interfaces
+  # Only processes monitored interfaces to match actual traffic being tracked
   defp aggregate_interface_traffic_stats(interfaces, since) do
     interfaces
+    |> Enum.filter(& &1.monitored)
     |> Enum.flat_map(fn interface ->
       interface.id
       |> Snmp.get_interface_stats(since: since, limit: 1000)
@@ -1329,16 +1331,78 @@ defmodule ToweropsWeb.DeviceLive.Show do
 
   # Calculate capacity data using sensor values (for radios with Rx/Tx Capacity sensors)
   # Sensor values represent total device capacity, not per-interface
+  # Loads time-series sensor readings to create a dynamic capacity line
   defp calculate_sensor_capacity_data(all_stats, rx_capacity_sensor, tx_capacity_sensor) do
-    rx_cap_bps = get_capacity_bps(rx_capacity_sensor) || 0
-    tx_cap_bps = get_capacity_bps(tx_capacity_sensor) || 0
+    twenty_four_hours_ago = DateTime.add(DateTime.utc_now(), -24, :hour)
+
+    # Load time-series readings for both sensors
+    rx_readings = load_capacity_sensor_readings(rx_capacity_sensor, twenty_four_hours_ago)
+    tx_readings = load_capacity_sensor_readings(tx_capacity_sensor, twenty_four_hours_ago)
+
+    # If we have sensor readings, use them directly (they have their own timestamps)
+    # Otherwise fall back to static values at traffic timestamps
+    if map_size(rx_readings) > 0 || map_size(tx_readings) > 0 do
+      build_capacity_data_from_sensors(rx_readings, tx_readings, rx_capacity_sensor, tx_capacity_sensor)
+    else
+      build_static_capacity_data(all_stats, rx_capacity_sensor, tx_capacity_sensor)
+    end
+  end
+
+  # Load sensor readings and convert to timestamp -> bps map
+  defp load_capacity_sensor_readings(nil, _since), do: %{}
+
+  defp load_capacity_sensor_readings(sensor, since) do
+    sensor.id
+    |> Snmp.get_sensor_readings(since: since, limit: 1000)
+    |> Map.new(&sensor_reading_to_capacity_point/1)
+  end
+
+  # Convert a sensor reading to {timestamp_ms, bps} tuple
+  # Sensor values are in Mbps, convert to bps
+  defp sensor_reading_to_capacity_point(reading) do
+    bps = capacity_value_to_bps(reading.value)
+    ts_ms = DateTime.to_unix(reading.checked_at, :millisecond)
+    {ts_ms, bps}
+  end
+
+  # Convert capacity sensor value (in Mbps) to bps
+  defp capacity_value_to_bps(nil), do: 0
+  defp capacity_value_to_bps(value) when is_number(value), do: round(value * 1_000_000)
+  defp capacity_value_to_bps(_), do: 0
+
+  # Build capacity data points from sensor readings
+  defp build_capacity_data_from_sensors(rx_readings, tx_readings, rx_sensor, tx_sensor) do
+    # Combine all unique timestamps from both sensors
+    all_timestamps =
+      (Map.keys(rx_readings) ++ Map.keys(tx_readings))
+      |> MapSet.new()
+      |> Enum.sort()
+
+    # Build capacity data points using sensor readings
+    Enum.map(all_timestamps, fn ts_ms ->
+      rx_bps = Map.get(rx_readings, ts_ms, get_fallback_capacity_bps(rx_sensor))
+      tx_bps = Map.get(tx_readings, ts_ms, get_fallback_capacity_bps(tx_sensor))
+      {ts_ms, rx_bps, tx_bps}
+    end)
+  end
+
+  # Build static capacity data at traffic timestamps
+  defp build_static_capacity_data(all_stats, rx_sensor, tx_sensor) do
+    rx_cap_bps = get_fallback_capacity_bps(rx_sensor)
+    tx_cap_bps = get_fallback_capacity_bps(tx_sensor)
 
-    # Use the same capacity for all timestamps
     Enum.map(all_stats, fn stat ->
       {stat.timestamp_ms, rx_cap_bps, tx_cap_bps}
     end)
   end
 
+  # Get fallback capacity in bps from sensor's last_value (already in Mbps)
+  defp get_fallback_capacity_bps(nil), do: 0
+
+  defp get_fallback_capacity_bps(sensor) do
+    capacity_value_to_bps(sensor.last_value)
+  end
+
   # Calculate capacity data from interface configured_capacity_bps or if_speed
   # Sums capacity of active interfaces at each timestamp
   defp calculate_interface_capacity_data(all_stats, device) do
@@ -1384,15 +1448,6 @@ defmodule ToweropsWeb.DeviceLive.Show do
     end)
   end
 
-  # Get capacity in bps from a sensor (sensor values are in Mbps, convert to bps)
-  defp get_capacity_bps(nil), do: nil
-
-  defp get_capacity_bps(%{last_value: value}) when is_number(value) do
-    # Sensor last_value is in Mbps (already divided by sensor_divisor), convert to bps
-    round(value * 1_000_000)
-  end
-
-  defp get_capacity_bps(_sensor), do: nil
   # Group interfaces by type for organized display
   defp group_interfaces_by_type(interfaces) do
     interfaces