users: let mods see users' last login time.

app/policies/user_policy.rb

@@ -23,6 +23,10 @@ class UserPolicy < ApplicationPolicy
     user.is_member?
   end
 
+  def can_see_last_logged_in_at?
+    user.is_moderator?
+  end
+
   def can_see_favorites?
     user.is_admin? || record.id == user.id || !record.enable_private_favorites?
   end

app/views/users/_statistics.html.erb

@@ -11,6 +11,13 @@
         <td><%= presenter.join_date %></td>
       </tr>
 
+      <% if policy(User).can_see_last_logged_in_at? %>
+        <tr>
+          <th>Last Seen</th>
+          <td><%= time_ago_in_words_tagged(user.last_logged_in_at) %></td>
+        </tr>
+      <% end %>
+
       <% if policy(IpAddress).show? %>
         <tr>
           <th>Last IP</th>

app/views/users/index.html.erb

@@ -32,6 +32,11 @@
       <% t.column "Level" do |user| %>
         <%= user.level_string %>
       <% end %>
+      <% if policy(User).can_see_last_logged_in_at? %>
+        <% t.column "Last Seen" do |user| %>
+          <%= time_ago_in_words_tagged(user.last_logged_in_at) %>
+        <% end %>
+      <% end %>
       <% t.column "Joined" do |user| %>
         <%= compact_time user.created_at %>
       <% end %>