diff --git a/server/lib/server_web/channels/host_channel.ex b/server/lib/server_web/channels/host_channel.ex
index 1103736..085065f 100644
--- a/server/lib/server_web/channels/host_channel.ex
+++ b/server/lib/server_web/channels/host_channel.ex
@@ -32,20 +32,35 @@ defmodule ServerWeb.HostChannel do
   def join(_topic, _params, _socket), do: {:error, %{reason: "bad_topic"}}
 
   @impl true
-  def handle_in("metric:fast", payload, socket) do
-    Logger.info("metric:fast host=#{socket.assigns.host_name} data=#{inspect(payload["data"])}")
-    {:reply, :ok, socket}
+  def handle_in("metric:" <> kind, payload, socket) when kind in ~w(fast medium slow) do
+    with {:ok, collected_at} <- parse_collected_at(payload),
+         {:ok, data} <- parse_data(payload),
+         {:ok, _} <-
+           Server.Metrics.record_sample(socket.assigns.host_id, kind, collected_at, data) do
+      Logger.debug("stored #{kind} sample host=#{socket.assigns.host_name}")
+      {:reply, :ok, socket}
+    else
+      {:error, reason} when is_binary(reason) ->
+        Logger.warning("metric:#{kind} rejected host=#{socket.assigns.host_name} reason=#{reason}")
+        {:reply, {:error, %{reason: reason}}, socket}
+
+      {:error, %Ecto.Changeset{} = cs} ->
+        Logger.warning("metric:#{kind} changeset failed: #{inspect(cs.errors)}")
+        {:reply, {:error, %{reason: "invalid_payload"}}, socket}
+    end
   end
 
-  def handle_in("metric:medium", payload, socket) do
-    Logger.info("metric:medium host=#{socket.assigns.host_name} payload=#{inspect(payload)}")
-    {:reply, :ok, socket}
+  defp parse_collected_at(%{"collected_at" => ts}) when is_binary(ts) do
+    case DateTime.from_iso8601(ts) do
+      {:ok, dt, _} -> {:ok, dt}
+      _ -> {:error, "invalid_collected_at"}
+    end
   end
 
-  def handle_in("metric:slow", payload, socket) do
-    Logger.info("metric:slow host=#{socket.assigns.host_name} payload=#{inspect(payload)}")
-    {:reply, :ok, socket}
-  end
+  defp parse_collected_at(_), do: {:error, "missing_collected_at"}
+
+  defp parse_data(%{"data" => data}) when is_map(data), do: {:ok, data}
+  defp parse_data(_), do: {:error, "missing_data"}
 
   @impl true
   def terminate(_reason, socket) do
diff --git a/server/test/server_web/channels/host_channel_test.exs b/server/test/server_web/channels/host_channel_test.exs
index 5450773..ba7ec22 100644
--- a/server/test/server_web/channels/host_channel_test.exs
+++ b/server/test/server_web/channels/host_channel_test.exs
@@ -48,8 +48,8 @@ defmodule ServerWeb.HostChannelTest do
     end
   end
 
-  describe "metric:fast event" do
-    setup %{token: token} do
+  describe "metric events persist to DB" do
+    setup %{token: token, host: host} do
       {:ok, socket} = connect(AgentSocket, %{})
 
       {:ok, _reply, joined} =
@@ -58,17 +58,63 @@ defmodule ServerWeb.HostChannelTest do
           "agent_version" => "0.1.0"
         })
 
-      %{socket: joined}
+      %{socket: joined, host: host}
     end
 
-    test "accepts metric payload and replies :ok", %{socket: socket} do
+    test "metric:fast is stored with interval=fast", %{socket: socket, host: host} do
+      ts = "2026-04-21T12:00:00.123456Z"
+
       ref =
         push(socket, "metric:fast", %{
-          "collected_at" => "2026-04-21T12:00:00Z",
+          "collected_at" => ts,
           "data" => %{"cpu_percent" => 12.3, "load1" => 0.2}
         })
 
       assert_reply ref, :ok
+
+      sample = Server.Metrics.latest_sample(host.id, "fast")
+      assert sample != nil
+      assert sample.payload == %{"cpu_percent" => 12.3, "load1" => 0.2}
+      {:ok, expected, _} = DateTime.from_iso8601(ts)
+      assert DateTime.compare(sample.collected_at, expected) == :eq
+    end
+
+    test "metric:medium is stored with interval=medium", %{socket: socket, host: host} do
+      ref =
+        push(socket, "metric:medium", %{
+          "collected_at" => "2026-04-21T12:05:00Z",
+          "data" => %{"vms_detail" => []}
+        })
+
+      assert_reply ref, :ok
+
+      sample = Server.Metrics.latest_sample(host.id, "medium")
+      assert sample != nil
+      assert sample.payload == %{"vms_detail" => []}
+    end
+
+    test "metric:slow is stored with interval=slow", %{socket: socket, host: host} do
+      ref =
+        push(socket, "metric:slow", %{
+          "collected_at" => "2026-04-21T12:30:00Z",
+          "data" => %{"system_info" => %{"pveversion" => "8.3.0"}}
+        })
+
+      assert_reply ref, :ok
+
+      sample = Server.Metrics.latest_sample(host.id, "slow")
+      assert sample != nil
+      assert sample.payload == %{"system_info" => %{"pveversion" => "8.3.0"}}
+    end
+
+    test "replies :error when collected_at is missing", %{socket: socket} do
+      ref = push(socket, "metric:fast", %{"data" => %{}})
+      assert_reply ref, :error, %{reason: "missing_collected_at"}
+    end
+
+    test "replies :error when data is missing", %{socket: socket} do
+      ref = push(socket, "metric:fast", %{"collected_at" => "2026-04-21T12:00:00Z"})
+      assert_reply ref, :error, %{reason: "missing_data"}
     end
   end