Adding last_login_at on sign-in, so it can be used in the admin view and elsewhere later. Also added the overall user count

app/assets/stylesheets/components/settings.css

@@ -8,6 +8,12 @@
   margin-bottom: var(--spacing-8);
 }
 
+.settings-page .settings-page-count {
+  font-weight: var(--font-weight-regular);
+  color: var(--color-text-muted);
+  margin-left: var(--spacing-2);
+}
+
 .settings-section {
   padding: var(--spacing-6) 0;
   border-bottom: var(--border-width) solid var(--color-border);

app/controllers/admin/users_controller.rb

@@ -8,6 +8,7 @@ def active_admin_section
   end
 
   def index
+    @users_total_count = User.active.count
     @users = User.active
                  .includes(person: [ :default_alias, :aliases ])
                  .order(created_at: :desc)

app/controllers/omniauth_callbacks_controller.rb

@@ -91,6 +91,7 @@ def google_oauth2
 
     reset_session
     session[:user_id] = identity.user_id
+    identity.user.update_columns(last_login_at: Time.current)
     redirect_to root_path, notice: "Signed in with Google"
   rescue => e
     Rails.logger.error("OIDC error: #{e.class}: #{e.message}")

app/controllers/sessions_controller.rb

@@ -21,6 +21,7 @@ def create
     else
       reset_session
       session[:user_id] = user.id
+      user.update_columns(last_login_at: Time.current)
       redirect_to root_path, notice: "Signed in successfully"
     end
   end

app/controllers/verifications_controller.rb

@@ -71,6 +71,7 @@ def handle_register(token)
 
     reset_session
     session[:user_id] = user.id
+    user.update_columns(last_login_at: Time.current)
     redirect_to root_path, notice: "Registration complete. You are signed in."
   end
 

app/views/admin/users/index.html.slim

@@ -1,7 +1,10 @@
 - content_for :title, "Admin — Users"
 
 .settings-page
-  h1 Users
+  h1
+    | Users
+    - if @users_total_count
+      span.settings-page-count = "(#{@users_total_count})"
 
   .email-table-wrap
     table.email-table
@@ -11,6 +14,7 @@
           th Emails
           th Admin
           th Created
+          th Last login
           th Actions
       tbody
         - @users.each do |user|
@@ -41,5 +45,6 @@
                 = button_to toggle_admin_admin_user_path(user), method: :post, class: "button-secondary button-small", data: { turbo_confirm: "#{user.admin? ? 'Remove' : 'Grant'} admin privileges for #{user.username}?" } do
                   = user.admin? ? "Remove admin" : "Make admin"
             td = user.created_at.strftime('%Y-%m-%d')
+            td = user.last_login_at ? smart_time_display(user.last_login_at) : "—"
             td
               = link_to "Add email", new_email_admin_user_path(user), class: "button-secondary button-small"

db/migrate/20260218120000_add_last_login_at_to_users.rb

@@ -0,0 +1,5 @@
+class AddLastLoginAtToUsers < ActiveRecord::Migration[7.1]
+  def change
+    add_column :users, :last_login_at, :datetime
+  end
+end