ProyectoIntermodular/android-app/app/proguard-rules.pro

-keep class com.luklpz.tfg.syncmanager.data.model.** { *; }
-keepattributes Signature
-keepattributes *Annotation*
-keep class retrofit2.** { *; }
-keep class com.google.gson.** { *; }
-dontwarn retrofit2.**