diff --git a/app/controllers/readings_controller.rb b/app/controllers/readings_controller.rb
index 796fe1f..cc796c8 100644
--- a/app/controllers/readings_controller.rb
+++ b/app/controllers/readings_controller.rb
@@ -6,23 +6,25 @@ class ReadingsController < ActionController::API
 
   # @see {https://docutopia.tupale.co/sutty:nodemecu:api}
   def create
-    reading = raspberry.readings.build reading_params
-    reading.id = params[:transaction_uuid]
-    # TODO: Verificar firma
-    reading.signature = headers[:'X-Signature']
+    Reading.transaction do
+      reading = raspberry.readings.build reading_params
+      reading.id = params[:transaction_uuid]
+      # TODO: Verificar firma
+      reading.signature = headers[:'X-Signature']
 
-    params[:arduinos]&.each do |a|
-      arduino = reading.arduinos.build local_id: a[:id], raspberry: raspberry
+      params[:arduinos]&.each do |a|
+        arduino = reading.arduinos.build local_id: a[:id], raspberry: raspberry
 
-      a[:sensores]&.each do |s|
-        arduino.sensors.build(sensor_params s)
+        a[:sensores]&.each do |s|
+          arduino.sensors.build(sensor_params s)
+        end
       end
-    end
 
-    if reading.save
-      render plain: reading.uuid, status: :ok
-    else
-      head :bad_request
+      if reading.save
+        render plain: reading.id, status: :ok
+      else
+        head :bad_request
+      end
     end
   end