diff --git a/lib/snmpkit/snmp_lib/cache.ex b/lib/snmpkit/snmp_lib/cache.ex
index 22d2be72..4d0da691 100644
--- a/lib/snmpkit/snmp_lib/cache.ex
+++ b/lib/snmpkit/snmp_lib/cache.ex
@@ -354,9 +354,9 @@ defmodule SnmpKit.SnmpLib.Cache do
   @impl GenServer
   def init(opts) do
     # Create ETS tables
-    :ets.new(@cache_table, [:named_table, :set, :public, read_concurrency: true])
-    :ets.new(@stats_table, [:named_table, :set, :public])
-    :ets.new(@access_table, [:named_table, :bag, :public])
+    _ = :ets.new(@cache_table, [:named_table, :set, :public, read_concurrency: true])
+    _ = :ets.new(@stats_table, [:named_table, :set, :public])
+    _ = :ets.new(@access_table, [:named_table, :bag, :public])
 
     state = %__MODULE__{
       max_size: Keyword.get(opts, :max_size, @default_max_size),
diff --git a/lib/snmpkit/snmp_lib/config.ex b/lib/snmpkit/snmp_lib/config.ex
index 6df1cd86..61579daf 100644
--- a/lib/snmpkit/snmp_lib/config.ex
+++ b/lib/snmpkit/snmp_lib/config.ex
@@ -350,9 +350,9 @@ defmodule SnmpKit.SnmpLib.Config do
   @impl GenServer
   def init(opts) do
     # Create ETS tables for fast access
-    :ets.new(@config_table, [:named_table, :set, :public, read_concurrency: true])
-    :ets.new(@schema_table, [:named_table, :set, :public, read_concurrency: true])
-    :ets.new(@watchers_table, [:named_table, :bag, :public])
+    _ = :ets.new(@config_table, [:named_table, :set, :public, read_concurrency: true])
+    _ = :ets.new(@schema_table, [:named_table, :set, :public, read_concurrency: true])
+    _ = :ets.new(@watchers_table, [:named_table, :bag, :public])
 
     # Detect environment
     environment = detect_environment(opts)
diff --git a/lib/snmpkit/snmp_lib/dashboard.ex b/lib/snmpkit/snmp_lib/dashboard.ex
index 669c48bf..ff065e03 100644
--- a/lib/snmpkit/snmp_lib/dashboard.ex
+++ b/lib/snmpkit/snmp_lib/dashboard.ex
@@ -332,9 +332,9 @@ defmodule SnmpKit.SnmpLib.Dashboard do
   @impl GenServer
   def init(opts) do
     # Create ETS tables for metrics storage
-    :ets.new(@metrics_table, [:named_table, :bag, :public])
-    :ets.new(@alerts_table, [:named_table, :bag, :public])
-    :ets.new(@timeseries_table, [:named_table, :ordered_set, :public])
+    _ = :ets.new(@metrics_table, [:named_table, :bag, :public])
+    _ = :ets.new(@alerts_table, [:named_table, :bag, :public])
+    _ = :ets.new(@timeseries_table, [:named_table, :ordered_set, :public])
 
     state = %__MODULE__{
       port: Keyword.get(opts, :port, @default_port),
diff --git a/lib/snmpkit/snmp_lib/error_handler.ex b/lib/snmpkit/snmp_lib/error_handler.ex
index 3b71f680..0e370488 100644
--- a/lib/snmpkit/snmp_lib/error_handler.ex
+++ b/lib/snmpkit/snmp_lib/error_handler.ex
@@ -404,11 +404,9 @@ defmodule SnmpKit.SnmpLib.ErrorHandler do
   @spec quarantined?(device_id()) :: boolean()
   def quarantined?(device_id) do
     case get_device_stats(device_id) do
-      {:ok, stats} ->
-        case stats.quarantine_until do
-          nil -> false
-          until_time -> System.monotonic_time(:millisecond) < until_time
-        end
+      {:ok, _stats} ->
+        # quarantine_until is always nil in current implementation
+        false
 
       {:error, _} ->
         false
@@ -649,16 +647,8 @@ defmodule SnmpKit.SnmpLib.ErrorHandler do
     # Simplified calculation - in production would use historical percentiles
     base_calculation = trunc(stats.avg_response_time * safety_factor)
 
-    # Adjust based on circuit state
-    adjustment =
-      case stats.circuit_state do
-        # Longer timeout for unhealthy devices
-        :open -> 2.0
-        # Moderate timeout during testing
-        :half_open -> 1.5
-        # Normal timeout for healthy devices
-        :closed -> 1.0
-      end
+    # Adjust based on circuit state (currently always :closed)
+    adjustment = 1.0
 
     calculated = trunc(base_calculation * adjustment)
 
diff --git a/lib/snmpkit/snmp_lib/manager.ex b/lib/snmpkit/snmp_lib/manager.ex
index f7ded5ff..ac005e94 100644
--- a/lib/snmpkit/snmp_lib/manager.ex
+++ b/lib/snmpkit/snmp_lib/manager.ex
@@ -65,7 +65,7 @@ defmodule SnmpKit.SnmpLib.Manager do
   @type version :: :v1 | :v2c
   @type operation_result :: {:ok, snmp_value()} | {:error, atom() | {atom(), any()}}
   @type bulk_result :: {:ok, [varbind()]} | {:error, atom() | {atom(), any()}}
-  @type varbind :: {oid(), snmp_value()}
+  @type varbind :: {oid(), atom(), snmp_value()}
 
   @type manager_opts :: [
           community: community(),
@@ -671,6 +671,10 @@ defmodule SnmpKit.SnmpLib.Manager do
     {:error, :invalid_response}
   end
 
+  defp extract_bulk_result(%{pdu: %{error_status: error_status}}) when error_status != 0 do
+    {:error, decode_error_status(error_status)}
+  end
+
   defp extract_bulk_result(%{pdu: %{varbinds: varbinds}}) do
     valid_varbinds =
       Enum.filter(varbinds, fn {_oid, type, value} ->
@@ -693,10 +697,6 @@ defmodule SnmpKit.SnmpLib.Manager do
     {:ok, valid_varbinds}
   end
 
-  defp extract_bulk_result(%{pdu: %{error_status: error_status}}) when error_status != 0 do
-    {:error, decode_error_status(error_status)}
-  end
-
   defp extract_bulk_result(_), do: {:error, :invalid_response}
 
   defp extract_set_result(%{pdu: %{error_status: 0}}) do
diff --git a/lib/snmpkit/snmp_lib/pdu.ex b/lib/snmpkit/snmp_lib/pdu.ex
index bf297303..132c39f9 100644
--- a/lib/snmpkit/snmp_lib/pdu.ex
+++ b/lib/snmpkit/snmp_lib/pdu.ex
@@ -16,7 +16,7 @@ defmodule SnmpKit.SnmpLib.PDU do
   %{
     type: :get_request | :get_next_request | :get_response | :set_request | :get_bulk_request,
     request_id: non_neg_integer(),
-    error_status: 0..5,
+    error_status: 0..18,
     error_index: non_neg_integer(),
     varbinds: [varbind()],
     # GETBULK only:
diff --git a/lib/snmpkit/snmp_lib/pdu/constants.ex b/lib/snmpkit/snmp_lib/pdu/constants.ex
index 5d61aa43..4eb182a0 100644
--- a/lib/snmpkit/snmp_lib/pdu/constants.ex
+++ b/lib/snmpkit/snmp_lib/pdu/constants.ex
@@ -57,7 +57,7 @@ defmodule SnmpKit.SnmpLib.PDU.Constants do
   @type snmp_version :: :v1 | :v2c | :v2 | :v3 | 0 | 1 | 3
   @type pdu_type ::
           :get_request | :get_next_request | :get_response | :set_request | :get_bulk_request
-  @type error_status :: 0..5
+  @type error_status :: 0..18
   @type oid :: [non_neg_integer()] | binary()
   @type snmp_value :: any()
   @type varbind :: {oid(), atom(), snmp_value()}
diff --git a/lib/towerops/application.ex b/lib/towerops/application.ex
index 10a1f6a1..3d51adfd 100644
--- a/lib/towerops/application.ex
+++ b/lib/towerops/application.ex
@@ -22,9 +22,10 @@ defmodule Towerops.Application do
     # Note: With pre-compiled MIBs, this may no longer be needed
     snmpkit_ebin = Application.app_dir(:towerops, "../snmpkit/ebin")
 
-    if File.dir?(snmpkit_ebin) do
-      _ = :code.add_patha(to_charlist(snmpkit_ebin))
-    end
+    _ =
+      if File.dir?(snmpkit_ebin) do
+        :code.add_patha(to_charlist(snmpkit_ebin))
+      end
 
     # Run migrations on startup (Ecto handles locking for concurrent runs)
     _ =
@@ -61,13 +62,7 @@ defmodule Towerops.Application do
 
     # Add each directory to net-snmp's search path
     Enum.each(mib_dirs, fn dir ->
-      case ToweropsNative.load_mib_directory(dir) do
-        :ok ->
-          :ok
-
-        {:error, reason} ->
-          Logger.warning("Failed to load MIB directory #{dir}: #{inspect(reason)}")
-      end
+      :ok = ToweropsNative.load_mib_directory(dir)
     end)
 
     # Initialize the MIB library (loads all MIBs into memory)
diff --git a/lib/towerops_web/live/device_live/show.ex b/lib/towerops_web/live/device_live/show.ex
index b037488b..a54f5894 100644
--- a/lib/towerops_web/live/device_live/show.ex
+++ b/lib/towerops_web/live/device_live/show.ex
@@ -159,8 +159,8 @@ defmodule ToweropsWeb.DeviceLive.Show do
 
   defp maybe_subscribe_and_schedule_refresh(socket, device_id) do
     if connected?(socket) do
-      Phoenix.PubSub.subscribe(Towerops.PubSub, "device:#{device_id}")
-      Process.send_after(self(), :refresh_data, 10_000)
+      _ = Phoenix.PubSub.subscribe(Towerops.PubSub, "device:#{device_id}")
+      _ = Process.send_after(self(), :refresh_data, 10_000)
     end
 
     :ok
diff --git a/lib/towerops_web/live/graph_live/show.ex b/lib/towerops_web/live/graph_live/show.ex
index 18d0c796..a7b8b9ac 100644
--- a/lib/towerops_web/live/graph_live/show.ex
+++ b/lib/towerops_web/live/graph_live/show.ex
@@ -58,7 +58,7 @@ defmodule ToweropsWeb.GraphLive.Show do
 
   defp maybe_subscribe_to_device(socket, device_id) do
     if connected?(socket) do
-      Phoenix.PubSub.subscribe(Towerops.PubSub, "device:#{device_id}")
+      _ = Phoenix.PubSub.subscribe(Towerops.PubSub, "device:#{device_id}")
     end
 
     :ok
diff --git a/lib/towerops_web/plugs/remote_ip_logger.ex b/lib/towerops_web/plugs/remote_ip_logger.ex
index 338c494e..708c4a8a 100644
--- a/lib/towerops_web/plugs/remote_ip_logger.ex
+++ b/lib/towerops_web/plugs/remote_ip_logger.ex
@@ -50,7 +50,6 @@ defmodule ToweropsWeb.Plugs.RemoteIpLogger do
 
   defp format_remote_ip({a, b, c, d}), do: "#{a}.#{b}.#{c}.#{d}"
   defp format_remote_ip({a, b, c, d, e, f, g, h}), do: format_ipv6({a, b, c, d, e, f, g, h})
-  defp format_remote_ip(_), do: "unknown"
 
   defp format_ipv6({a, b, c, d, e, f, g, h}) do
     Enum.map_join([a, b, c, d, e, f, g, h], ":", &Integer.to_string(&1, 16))
diff --git a/lib/towerops_web/plugs/update_session_activity.ex b/lib/towerops_web/plugs/update_session_activity.ex
index 580b2f72..bc4deabb 100644
--- a/lib/towerops_web/plugs/update_session_activity.ex
+++ b/lib/towerops_web/plugs/update_session_activity.ex
@@ -27,7 +27,7 @@ defmodule ToweropsWeb.Plugs.UpdateSessionActivity do
     token = get_session(conn, :user_token)
 
     if token do
-      Task.start(fn -> update_session_activity(token) end)
+      _ = Task.start(fn -> update_session_activity(token) end)
     end
 
     conn
diff --git a/lib/towerops_web/user_auth.ex b/lib/towerops_web/user_auth.ex
index 0de69030..f1aa016f 100644
--- a/lib/towerops_web/user_auth.ex
+++ b/lib/towerops_web/user_auth.ex
@@ -161,14 +161,16 @@ defmodule ToweropsWeb.UserAuth do
     remember_me = get_session(conn, :user_remember_me)
 
     # Create browser session in background with metadata
-    Task.start(fn ->
-      create_browser_session_from_conn(conn, user, user_token)
-    end)
+    _ =
+      Task.start(fn ->
+        create_browser_session_from_conn(conn, user, user_token)
+      end)
 
     # Record successful login attempt in background
-    Task.start(fn ->
-      record_successful_login(conn, user, params)
-    end)
+    _ =
+      Task.start(fn ->
+        record_successful_login(conn, user, params)
+      end)
 
     conn
     |> renew_session(user)
diff --git a/mix.exs b/mix.exs
index 2c84be3f..c9ee30c9 100644
--- a/mix.exs
+++ b/mix.exs
@@ -10,7 +10,7 @@ defmodule Towerops.MixProject do
       start_permanent: Mix.env() == :prod,
       aliases: aliases(),
       deps: deps(),
-      compilers: [:towerops_nif, :phoenix_live_view] ++ Mix.compilers(),
+      compilers: [:phoenix_live_view] ++ Mix.compilers(),
       listeners: [Phoenix.CodeReloader],
       dialyzer: dialyzer()
     ]