diff --git a/app/models/category.rb b/app/models/category.rb
index 72fe1b6e49f..54f59af7226 100644
--- a/app/models/category.rb
+++ b/app/models/category.rb
@@ -560,5 +560,5 @@ end
 #
 #  index_categories_on_email_in     (email_in) UNIQUE
 #  index_categories_on_topic_count  (topic_count)
-#  unique_index_categories_on_name  (name) UNIQUE
+#  unique_index_categories_on_name  ((COALESCE(parent_category_id, '-1'::integer)), name) UNIQUE
 #
diff --git a/app/models/post_custom_field.rb b/app/models/post_custom_field.rb
index 713d0affbc8..999500de527 100644
--- a/app/models/post_custom_field.rb
+++ b/app/models/post_custom_field.rb
@@ -15,6 +15,6 @@ end
 #
 # Indexes
 #
-#  index_post_custom_fields_on_name_and_value    (name)
+#  index_post_custom_fields_on_name_and_value    (name, "left"(value, 200))
 #  index_post_custom_fields_on_post_id_and_name  (post_id,name)
 #
diff --git a/app/models/topic.rb b/app/models/topic.rb
index 59822cd2562..f4093cb8f5c 100644
--- a/app/models/topic.rb
+++ b/app/models/topic.rb
@@ -1336,6 +1336,7 @@ end
 #  index_topics_on_bumped_at               (bumped_at)
 #  index_topics_on_created_at_and_visible  (created_at,visible)
 #  index_topics_on_id_and_deleted_at       (id,deleted_at)
+#  index_topics_on_lower_title             (lower((title)::text))
 #  index_topics_on_pinned_at               (pinned_at)
 #  index_topics_on_pinned_globally         (pinned_globally)
 #
diff --git a/app/models/upload.rb b/app/models/upload.rb
index 329e59714af..148deea2279 100644
--- a/app/models/upload.rb
+++ b/app/models/upload.rb
@@ -170,6 +170,7 @@ end
 #
 # Indexes
 #
+#  index_uploads_on_extension   (lower((extension)::text))
 #  index_uploads_on_id_and_url  (id,url)
 #  index_uploads_on_sha1        (sha1) UNIQUE
 #  index_uploads_on_url         (url)
diff --git a/app/models/user.rb b/app/models/user.rb
index 3c3d4abc9d6..2429418648a 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -1124,6 +1124,7 @@ end
 #  name                    :string
 #  seen_notification_id    :integer          default(0), not null
 #  last_posted_at          :datetime
+#  email                   :string(513)
 #  password_hash           :string(64)
 #  salt                    :string(32)
 #  active                  :boolean          default(FALSE), not null
@@ -1157,6 +1158,7 @@ end
 #
 #  idx_users_admin                    (id)
 #  idx_users_moderator                (id)
+#  index_users_on_email               (lower((email)::text)) UNIQUE
 #  index_users_on_last_posted_at      (last_posted_at)
 #  index_users_on_last_seen_at        (last_seen_at)
 #  index_users_on_uploaded_avatar_id  (uploaded_avatar_id)
diff --git a/app/models/user_email.rb b/app/models/user_email.rb
index 485c3f0bc08..c7b35eb3cea 100644
--- a/app/models/user_email.rb
+++ b/app/models/user_email.rb
@@ -42,6 +42,7 @@ end
 #
 # Indexes
 #
+#  index_user_emails_on_email                (lower((email)::text)) UNIQUE
 #  index_user_emails_on_user_id              (user_id)
 #  index_user_emails_on_user_id_and_primary  (user_id,primary) UNIQUE
 #