diff --git a/lib/nulla/models/user.ex b/lib/nulla/models/user.ex
index b3ef7ce..ce1ce22 100644
--- a/lib/nulla/models/user.ex
+++ b/lib/nulla/models/user.ex
@@ -1,6 +1,7 @@
 defmodule Nulla.Models.User do
   use Ecto.Schema
   import Ecto.Changeset
+  import Ecto.Query
   alias Nulla.Repo
   alias Nulla.Snowflake
   alias Nulla.Models.User
@@ -8,6 +9,7 @@ defmodule Nulla.Models.User do
   @primary_key {:id, :integer, autogenerate: false}
   schema "users" do
     field :username, :string
+    field :domain, :string
     field :email, :string
     field :password, :string
     field :is_moderator, :boolean, default: false
@@ -15,7 +17,7 @@ defmodule Nulla.Models.User do
     field :bio, :string
     field :location, :string
     field :birthday, :date
-    field :fields, :map
+    field :fields, {:array, :map}
     field :tags, {:array, :string}
     field :follow_approval, :boolean, default: false
     field :is_bot, :boolean, default: false
@@ -26,6 +28,7 @@ defmodule Nulla.Models.User do
     field :public_key, :string
     field :avatar, :string
     field :banner, :string
+    field :last_active_at, :utc_datetime
 
     has_many :user_sessions, Nulla.Models.Session
     has_many :notes, Nulla.Models.Note
@@ -39,6 +42,7 @@ defmodule Nulla.Models.User do
     user
     |> cast(attrs, [
       :username,
+      :domain,
       :email,
       :password,
       :is_moderator,
@@ -55,10 +59,12 @@ defmodule Nulla.Models.User do
       :private_key,
       :public_key,
       :avatar,
-      :banner
+      :banner,
+      :last_active_at
     ])
     |> validate_required([
       :username,
+      :domain,
       :email,
       :password,
       :is_moderator,
@@ -75,7 +81,8 @@ defmodule Nulla.Models.User do
       :private_key,
       :public_key,
       :avatar,
-      :banner
+      :banner,
+      :last_active_at
     ])
   end
 
@@ -91,4 +98,23 @@ defmodule Nulla.Models.User do
   def get_user_by_username(username), do: Repo.get_by(User, username: username)
 
   def get_user_by_username!(username), do: Repo.get_by!(User, username: username)
+
+  def get_total_users_count(domain) do
+    Repo.aggregate(from(u in User, where: u.domain == ^domain), :count, :id)
+  end
+
+  def get_active_users_count(domain, days) do
+    cutoff = DateTime.add(DateTime.utc_now(), -days * 86400, :second)
+
+    from(u in User,
+      where: u.domain == ^domain and u.last_active_at > ^cutoff
+    )
+    |> Repo.aggregate(:count, :id)
+  end
+
+  def update_last_active(user) do
+    user
+    |> Ecto.Changeset.change(last_active_at: DateTime.utc_now())
+    |> Repo.update()
+  end
 end
diff --git a/lib/nulla_web/controllers/nodeinfo_controller.ex b/lib/nulla_web/controllers/nodeinfo_controller.ex
index 92efc88..46a3bed 100644
--- a/lib/nulla_web/controllers/nodeinfo_controller.ex
+++ b/lib/nulla_web/controllers/nodeinfo_controller.ex
@@ -14,11 +14,16 @@ defmodule NullaWeb.NodeinfoController do
 
   def show(conn, _params) do
     version = Application.spec(:nulla, :vsn) |> to_string()
+    instance_settings = InstanceSettings.get_instance_settings!()
+    domain = instance_settings.domain
+    total = User.get_total_users_count(domain)
+    month = User.get_active_users_count(domain, 30)
+    halfyear = User.get_active_users_count(domain, 180)
 
     users = %{
-      total: 0,
-      month: 0,
-      halfyear: 0
+      total: total,
+      month: month,
+      halfyear: halfyear
     }
 
     instance_settings = InstanceSettings.get_instance_settings!()
diff --git a/priv/repo/migrations/20250530110822_create_users.exs b/priv/repo/migrations/20250530110822_create_users.exs
index b597c2f..2b48cfa 100644
--- a/priv/repo/migrations/20250530110822_create_users.exs
+++ b/priv/repo/migrations/20250530110822_create_users.exs
@@ -5,6 +5,7 @@ defmodule Nulla.Repo.Migrations.CreateUsers do
     create table(:users, primary_key: false) do
       add :id, :bigint, primary_key: true
       add :username, :string, null: false, unique: true
+      add :domain, :string, null: false
       add :email, :string
       add :password, :string
       add :is_moderator, :boolean, default: false, null: false
@@ -12,7 +13,7 @@ defmodule Nulla.Repo.Migrations.CreateUsers do
       add :bio, :text
       add :location, :string
       add :birthday, :date
-      add :fields, :map
+      add :fields, :jsonb, default: "[]", null: false
       add :tags, {:array, :string}
       add :follow_approval, :boolean, default: false, null: false
       add :is_bot, :boolean, default: false, null: false
@@ -23,6 +24,7 @@ defmodule Nulla.Repo.Migrations.CreateUsers do
       add :public_key, :string, null: false
       add :avatar, :string
       add :banner, :string
+      add :last_active_at, :utc_datetime
 
       timestamps(type: :utc_datetime)
     end