diff --git a/app/models/metadata_boolean.rb b/app/models/metadata_boolean.rb
index 5e4b456f..53a763fd 100644
--- a/app/models/metadata_boolean.rb
+++ b/app/models/metadata_boolean.rb
@@ -31,6 +31,11 @@ class MetadataBoolean < MetadataTemplate
     self[:value] = true_values.include? self[:value]
   end
 
+  # Siempre guardar el valor de este campo a menos que sea nulo
+  def empty?
+    !value.nil?
+  end
+
   private
 
   # Los valores que evalúan a verdadero
diff --git a/app/models/metadata_content.rb b/app/models/metadata_content.rb
index 437a0dd9..9d3a1040 100644
--- a/app/models/metadata_content.rb
+++ b/app/models/metadata_content.rb
@@ -56,7 +56,7 @@ class MetadataContent < MetadataTemplate
         uri = URI element['src']
 
         # No permitimos recursos externos
-        element.remove unless uri.hostname.end_with? Site.domain
+        element.remove unless uri.scheme == 'https' && uri.hostname.end_with?(Site.domain)
       rescue URI::Error
         element.remove
       end
diff --git a/app/models/metadata_float.rb b/app/models/metadata_float.rb
new file mode 100644
index 00000000..b4288a3b
--- /dev/null
+++ b/app/models/metadata_float.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+# Un campo numérico de punto flotante
+class MetadataFloat < MetadataTemplate
+  # Nada
+  def default_value
+    super || nil
+  end
+
+  def save
+    return true unless changed?
+
+    self[:value] = value.to_f
+    self[:value] = encrypt(value) if private?
+
+    true
+  end
+
+  # Indicarle al navegador que acepte números decimales
+  #
+  # @return [Float]
+  def step
+    0.05
+  end
+
+  private
+
+  def decrypt(value)
+    super(value).to_f
+  end
+end
diff --git a/app/models/metadata_predefined_value.rb b/app/models/metadata_predefined_value.rb
new file mode 100644
index 00000000..9cf36382
--- /dev/null
+++ b/app/models/metadata_predefined_value.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+# Un campo de texto seleccionado de una lista de valores posibles
+class MetadataPredefinedValue < MetadataString
+  # Obtiene todos los valores desde el layout, en un formato compatible
+  # con options_for_select.
+  #
+  # @return [Hash]
+  def values
+    @values ||= layout.dig(:metadata, name, 'values', I18n.locale.to_s)&.invert || {}
+  end
+
+  private
+
+  # Solo permite almacenar los valores predefinidos.
+  #
+  # @return [String]
+  def sanitize(string)
+    v = super string
+    return '' unless values.values.include? v
+
+    v
+  end
+end
diff --git a/app/views/posts/attribute_ro/_float.haml b/app/views/posts/attribute_ro/_float.haml
new file mode 100644
index 00000000..67642e2c
--- /dev/null
+++ b/app/views/posts/attribute_ro/_float.haml
@@ -0,0 +1,3 @@
+%tr{ id: attribute }
+  %th= post_label_t(attribute, post: post)
+  %td{ dir: dir, lang: locale }= metadata.value
diff --git a/app/views/posts/attribute_ro/_predefined_value.haml b/app/views/posts/attribute_ro/_predefined_value.haml
new file mode 100644
index 00000000..67642e2c
--- /dev/null
+++ b/app/views/posts/attribute_ro/_predefined_value.haml
@@ -0,0 +1,3 @@
+%tr{ id: attribute }
+  %th= post_label_t(attribute, post: post)
+  %td{ dir: dir, lang: locale }= metadata.value
diff --git a/app/views/posts/attributes/_float.haml b/app/views/posts/attributes/_float.haml
new file mode 100644
index 00000000..6239c613
--- /dev/null
+++ b/app/views/posts/attributes/_float.haml
@@ -0,0 +1,6 @@
+.form-group
+  = label_tag "#{base}_#{attribute}", post_label_t(attribute, post: post)
+  = number_field base, attribute, value: metadata.value, step: metadata.step,
+    **field_options(attribute, metadata)
+  = render 'posts/attribute_feedback',
+    post: post, attribute: attribute, metadata: metadata
diff --git a/app/views/posts/attributes/_predefined_value.haml b/app/views/posts/attributes/_predefined_value.haml
new file mode 100644
index 00000000..b0d21f35
--- /dev/null
+++ b/app/views/posts/attributes/_predefined_value.haml
@@ -0,0 +1,7 @@
+.form-group
+  = label_tag "#{base}_#{attribute}", post_label_t(attribute, post: post)
+  = select_tag(plain_field_name_for(base, attribute),
+    options_for_select(metadata.values, metadata.value),
+    **field_options(attribute, metadata), include_blank: t('.empty'))
+  = render 'posts/attribute_feedback',
+    post: post, attribute: attribute, metadata: metadata
diff --git a/config/locales/en.yml b/config/locales/en.yml
index be327035..01f08b88 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -163,7 +163,7 @@ en:
       signature: 'With love, Sutty'
     breadcrumb:
       title: 'Your location in Sutty'
-      logout: Exit
+      logout: Log out 
       mutual_aid: Mutual aid
   collaborations:
     collaborate:
@@ -442,6 +442,8 @@ en:
         destroy: Remove image
       belongs_to:
         empty: "(Empty)"
+      predefined_value:
+        empty: "(Empty)"
       draft:
         label: Draft
     reorder:
diff --git a/config/locales/es.yml b/config/locales/es.yml
index 774a8cfd..931f25ed 100644
--- a/config/locales/es.yml
+++ b/config/locales/es.yml
@@ -163,7 +163,7 @@ es:
       signature: 'Con cariño, Sutty'
     breadcrumb:
       title: 'Tu ubicación en Sutty'
-      logout: Salir
+      logout: Cerrar sesión 
       mutual_aid: Ayuda mutua
   collaborations:
     collaborate:
@@ -450,6 +450,8 @@ es:
         destroy: 'Eliminar imagen'
       belongs_to:
         empty: "(Vacío)"
+      predefined_value:
+        empty: "(Vacío)"
       draft:
         label: Borrador
     reorder:
diff --git a/db/migrate/20210926205448_add_uniqueness.rb b/db/migrate/20210926205448_add_uniqueness.rb
new file mode 100644
index 00000000..7399ba4c
--- /dev/null
+++ b/db/migrate/20210926205448_add_uniqueness.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+# Agrega índices únicos que pensábamos que ya existían.
+class AddUniqueness < ActiveRecord::Migration[6.1]
+  def change
+    add_index :designs, :name, unique: true
+    add_index :designs, :gem, unique: true
+    add_index :licencias, :name, unique: true
+  end
+end