diff --git a/app/assets/stylesheets/application.css b/app/assets/stylesheets/application.css
index 77442e2..895c0e9 100644
--- a/app/assets/stylesheets/application.css
+++ b/app/assets/stylesheets/application.css
@@ -172,6 +172,7 @@ input[type=checkbox]:checked {
 }
 /* Hide spin buttons in input number fields */
 input[type=number] {
+  appearance: textfield;
   -moz-appearance: textfield;
 }
 input::-webkit-inner-spin-button {
diff --git a/app/javascript/application.js b/app/javascript/application.js
index 54a9026..ad91a40 100644
--- a/app/javascript/application.js
+++ b/app/javascript/application.js
@@ -106,7 +106,7 @@ function dragLeave(event) {
   if (event.timeStamp <= lastEnterTime) return;
   event.currentTarget.closest("table").querySelectorAll(".dropzone").forEach((tr) => {
     tr.classList.remove("dropzone");
-  })
+  });
 }
 window.dragLeave = dragLeave;
 
diff --git a/app/models/user.rb b/app/models/user.rb
index d76568b..60e9df1 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -7,9 +7,10 @@ class User < ApplicationRecord
     admin: 4,       # admin level access
     active: 3,      # read-write user level access
     restricted: 2,  # read-only user level access
-    locked: 1,      # disallowed to sign in due to failed logins; maintained by Devise :lockable
+    locked: 1,      # disallowed to sign in due to failed logins; maintained by
+                    #   Devise :lockable
     disabled: 0,    # administratively disallowed to sign in
-  }, default: :active
+  }, default: :active, validate: true
 
   has_many :readouts, dependent: :destroy
   accepts_nested_attributes_for :readouts
diff --git a/app/views/measurements/index.html.erb b/app/views/measurements/index.html.erb
index 7be4cbf..25d2013 100644
--- a/app/views/measurements/index.html.erb
+++ b/app/views/measurements/index.html.erb
@@ -4,7 +4,7 @@
     <%# TODO: show hint when no quantities/units defined %>
     <div class="hflex">
       <%= select_tag :id, options_from_collection_for_select(
-        @quantities, :id, ->(q){ sanitize('&emsp;'*q.depth + q.name) }
+        @quantities, :id, ->(q){ sanitize('&emsp;' * q.depth + q.name) }
       ), form: :new_readouts_form %>
       <% common_options = {form: :new_readouts_form, formaction: new_measurement_path,
                            formmethod: :get, formnovalidate: true,
diff --git a/app/views/quantities/create.turbo_stream.erb b/app/views/quantities/create.turbo_stream.erb
index 7a5c339..d70c0af 100644
--- a/app/views/quantities/create.turbo_stream.erb
+++ b/app/views/quantities/create.turbo_stream.erb
@@ -1,6 +1,6 @@
 <%= turbo_stream.close_form dom_id(@quantity.parent || Quantity, :new) %>
 <%= turbo_stream.remove :no_items %>
-<% @ancestors.map do |ancestor| %>
+<% @ancestors.each do |ancestor| %>
   <%= turbo_stream.replace ancestor %>
 <% end %>
 <%= @before ? turbo_stream.before(@before, @quantity) :
diff --git a/app/views/quantities/destroy.turbo_stream.erb b/app/views/quantities/destroy.turbo_stream.erb
index 5330055..9dd001e 100644
--- a/app/views/quantities/destroy.turbo_stream.erb
+++ b/app/views/quantities/destroy.turbo_stream.erb
@@ -1,4 +1,4 @@
-<% @ancestors.map do |ancestor| %>
+<% @ancestors.each do |ancestor| %>
   <%= turbo_stream.replace ancestor %>
 <% end %>
 <%= turbo_stream.remove @quantity %>
diff --git a/app/views/quantities/reparent.turbo_stream.erb b/app/views/quantities/reparent.turbo_stream.erb
index 0533837..e0517ae 100644
--- a/app/views/quantities/reparent.turbo_stream.erb
+++ b/app/views/quantities/reparent.turbo_stream.erb
@@ -1,7 +1,7 @@
 <% @self_and_progenies.each do |q| %>
   <%= turbo_stream.remove q %>
 <% end %>
-<% @previous_ancestors.union(@ancestors).map do |ancestor| %>
+<% @previous_ancestors.union(@ancestors).each do |ancestor| %>
   <%= turbo_stream.replace ancestor %>
 <% end %>
 <% @self_and_progenies.each do |q| %>
diff --git a/app/views/quantities/update.turbo_stream.erb b/app/views/quantities/update.turbo_stream.erb
index b94fd49..3275ed3 100644
--- a/app/views/quantities/update.turbo_stream.erb
+++ b/app/views/quantities/update.turbo_stream.erb
@@ -1,4 +1,4 @@
 <%= turbo_stream.close_form dom_id(@quantity, :edit) %>
-<% @ancestors.push(@quantity).map do |ancestor| %>
+<% @ancestors.push(@quantity).each do |ancestor| %>
   <%= turbo_stream.replace ancestor %>
 <% end %>
diff --git a/app/views/users/index.html.erb b/app/views/users/index.html.erb
index 26c5502..a635b2a 100644
--- a/app/views/users/index.html.erb
+++ b/app/views/users/index.html.erb
@@ -4,7 +4,9 @@
       <th><%= User.human_attribute_name(:email).capitalize %></th>
       <th><%= User.human_attribute_name(:status).capitalize %></th>
       <th><%= User.human_attribute_name(:confirmed_at).capitalize %></th>
-      <th><%= User.human_attribute_name(:created_at).capitalize %>&nbsp;<sup>UTC</sup></th>
+      <th>
+        <%= User.human_attribute_name(:created_at).capitalize %>&nbsp;<sup>UTC</sup>
+      </th>
       <th><%= t :actions %></th>
     </tr>
   </thead>
@@ -22,15 +24,15 @@
             <% end %>
           <% end %>
         </td>
-      <td class="svg">
-        <%= svg_tag "pictograms/checkbox-marked-outline" if user.confirmed_at.present? %>
-      </td>
-      <td><%= user.created_at.to_fs(:db_without_sec) %></td>
-      <td class="actions">
-        <% if allow_disguise?(user) %>
-          <%= image_link_to t(".disguise"), "incognito", disguise_user_path(user) %>
-        <% end %>
-      </td>
+        <td class="svg">
+          <%= svg_tag "pictograms/checkbox-marked-outline" if user.confirmed_at.present? %>
+        </td>
+        <td><%= user.created_at.to_fs(:db_without_sec) %></td>
+        <td class="actions">
+          <% if allow_disguise?(user) %>
+            <%= image_link_to t(".disguise"), "incognito", disguise_user_path(user) %>
+          <% end %>
+        </td>
       </tr>
     <% end %>
   </tbody>