diff --git a/Orso.Arpa.Application/TranslationApplication/Services/TranslationConverters.cs b/Orso.Arpa.Application/TranslationApplication/Services/TranslationConverters.cs
index e08e39c25..1ce1579e2 100644
--- a/Orso.Arpa.Application/TranslationApplication/Services/TranslationConverters.cs
+++ b/Orso.Arpa.Application/TranslationApplication/Services/TranslationConverters.cs
@@ -2,6 +2,7 @@
 using AutoMapper;
 using Orso.Arpa.Application.TranslationApplication.Model;
 using Orso.Arpa.Domain.LocalizationDomain.Model;
+using Orso.Arpa.Misc;
 
 namespace Orso.Arpa.Application.TranslationApplication.Services
 {
@@ -16,7 +17,7 @@ public List<Localization> Convert(TranslationDto source, List<Localization> dest
             {
                 foreach (KeyValuePair<string, string> t in rk.Value)
                 {
-                    var localization = new Localization(null, t.Key, t.Value, null, rk.Key);
+                    var localization = new Localization(t.Key.CreateGuid(), t.Key, t.Value, null, rk.Key);
                     translations.Add(localization);
                 }
             }
diff --git a/Orso.Arpa.Domain/AddressDomain/Model/Address.cs b/Orso.Arpa.Domain/AddressDomain/Model/Address.cs
index 56ad69804..1ca3777e3 100644
--- a/Orso.Arpa.Domain/AddressDomain/Model/Address.cs
+++ b/Orso.Arpa.Domain/AddressDomain/Model/Address.cs
@@ -11,13 +11,13 @@ namespace Orso.Arpa.Domain.AddressDomain.Model
 {
     public class Address : BaseEntity
     {
-        public Address(Guid? id, CreateAddress.Command command) : this(id, (BaseAddressCreateCommand)command) {
+        public Address(Guid id, CreateAddress.Command command) : this(id, (BaseAddressCreateCommand)command) {
             PersonId = command.PersonId;
         }
 
-        public Address(Guid? id, CreateVenue.Command command) : this(id, (BaseAddressCreateCommand)command) {}
+        public Address(Guid id, CreateVenue.Command command) : this(id, (BaseAddressCreateCommand)command) {}
 
-        private Address(Guid? id, BaseAddressCreateCommand command) : base(id)
+        private Address(Guid id, BaseAddressCreateCommand command) : base(id)
         {
             Address1 = command.Address1;
             Address2 = command.Address2;
@@ -30,7 +30,7 @@ private Address(Guid? id, BaseAddressCreateCommand command) : base(id)
             TypeId = command.TypeId;
         }
 
-        internal Address(Guid? id) : base(id)
+        internal Address(Guid id) : base(id)
         {
         }
 
diff --git a/Orso.Arpa.Domain/AppointmentDomain/Model/Appointment.cs b/Orso.Arpa.Domain/AppointmentDomain/Model/Appointment.cs
index f7818fcd1..210a6ef5b 100644
--- a/Orso.Arpa.Domain/AppointmentDomain/Model/Appointment.cs
+++ b/Orso.Arpa.Domain/AppointmentDomain/Model/Appointment.cs
@@ -14,7 +14,7 @@ namespace Orso.Arpa.Domain.AppointmentDomain.Model
 {
     public class Appointment : BaseEntity
     {
-        public Appointment(Guid? id, CreateAppointment.Command command) : base(id)
+        public Appointment(Guid id, CreateAppointment.Command command) : base(id)
         {
             CategoryId = command.CategoryId;
             StartTime = command.StartTime;
diff --git a/Orso.Arpa.Domain/AppointmentDomain/Model/AppointmentParticipation.cs b/Orso.Arpa.Domain/AppointmentDomain/Model/AppointmentParticipation.cs
index 4f08aaac8..6ce4dee37 100644
--- a/Orso.Arpa.Domain/AppointmentDomain/Model/AppointmentParticipation.cs
+++ b/Orso.Arpa.Domain/AppointmentDomain/Model/AppointmentParticipation.cs
@@ -8,7 +8,7 @@ namespace Orso.Arpa.Domain.AppointmentDomain.Model
 {
     public class AppointmentParticipation : BaseEntity
     {
-        public AppointmentParticipation(Guid? id, CreateAppointmentParticipation.Command command) : base(id)
+        public AppointmentParticipation(Guid id, CreateAppointmentParticipation.Command command) : base(id)
         {
             PersonId = command.PersonId;
             AppointmentId = command.AppointmentId;
diff --git a/Orso.Arpa.Domain/AppointmentDomain/Model/AppointmentRoom.cs b/Orso.Arpa.Domain/AppointmentDomain/Model/AppointmentRoom.cs
index 36990400a..91f6e24bb 100644
--- a/Orso.Arpa.Domain/AppointmentDomain/Model/AppointmentRoom.cs
+++ b/Orso.Arpa.Domain/AppointmentDomain/Model/AppointmentRoom.cs
@@ -6,13 +6,13 @@ namespace Orso.Arpa.Domain.AppointmentDomain.Model
 {
     public class AppointmentRoom : BaseEntity
     {
-        public AppointmentRoom(Guid? id, Appointment appointment, Room room) : base(id)
+        public AppointmentRoom(Guid? id, Appointment appointment, Room room) : base(id ?? Guid.NewGuid())
         {
             Appointment = appointment;
             Room = room;
         }
 
-        public AppointmentRoom(Guid appointmentId, Guid roomId)
+        public AppointmentRoom(Guid? id, Guid appointmentId, Guid roomId) : base(id ?? Guid.NewGuid())
         {
             AppointmentId = appointmentId;
             RoomId = roomId;
diff --git a/Orso.Arpa.Domain/ClubDomain/Model/Club.cs b/Orso.Arpa.Domain/ClubDomain/Model/Club.cs
index 85836f05d..8d7d9e955 100644
--- a/Orso.Arpa.Domain/ClubDomain/Model/Club.cs
+++ b/Orso.Arpa.Domain/ClubDomain/Model/Club.cs
@@ -11,7 +11,7 @@ namespace Orso.Arpa.Domain.ClubDomain.Model
     /// </summary>
     public class Club : BaseEntity
     {
-        public Club(Guid? id, CreateClub.Command command) : base(id)
+        public Club(Guid id, CreateClub.Command command) : base(id)
         {
             Name = command.Name;
            // Address = new Address(command);
diff --git a/Orso.Arpa.Domain/ClubDomain/Model/ClubMemberhipType.cs b/Orso.Arpa.Domain/ClubDomain/Model/ClubMemberhipType.cs
index 4b1c9d508..4b70f9781 100644
--- a/Orso.Arpa.Domain/ClubDomain/Model/ClubMemberhipType.cs
+++ b/Orso.Arpa.Domain/ClubDomain/Model/ClubMemberhipType.cs
@@ -11,7 +11,7 @@ namespace Orso.Arpa.Domain.ClubDomain.Model
    /// </summary>
     public class ClubMembershipType : BaseEntity
     {
-        public ClubMembershipType(Guid? id, CreateClubMembershipType.Command command) : base(id)
+        public ClubMembershipType(Guid id, CreateClubMembershipType.Command command) : base(id)
         {
             ClubId = command.ClubId;
             Name = command.Name;
diff --git a/Orso.Arpa.Domain/ClubDomain/Model/ClubMembershipContribution.cs b/Orso.Arpa.Domain/ClubDomain/Model/ClubMembershipContribution.cs
index 6ff2423d2..3e03d7a37 100644
--- a/Orso.Arpa.Domain/ClubDomain/Model/ClubMembershipContribution.cs
+++ b/Orso.Arpa.Domain/ClubDomain/Model/ClubMembershipContribution.cs
@@ -11,7 +11,7 @@ namespace Orso.Arpa.Domain.ClubDomain.Model
     /// </summary>
     public class ClubMembershipContribution : BaseEntity, IVersionedEntity
     {
-        public ClubMembershipContribution(Guid? id, CreateClubMembershipContribution.Command command) : base(id)
+        public ClubMembershipContribution(Guid id, CreateClubMembershipContribution.Command command) : base(id)
         {
             ContributionPerYearInEuro = command.ContributionPerYearInEuro;
             ValidFrom = command.ValidFrom;
diff --git a/Orso.Arpa.Domain/ClubDomain/Model/ClubMembershipSubType.cs b/Orso.Arpa.Domain/ClubDomain/Model/ClubMembershipSubType.cs
index 1d2337923..257a726fa 100644
--- a/Orso.Arpa.Domain/ClubDomain/Model/ClubMembershipSubType.cs
+++ b/Orso.Arpa.Domain/ClubDomain/Model/ClubMembershipSubType.cs
@@ -8,7 +8,7 @@ namespace Orso.Arpa.Domain.ClubDomain.Model
 {
     public class ClubMembershipSubType : BaseEntity
     {
-        public ClubMembershipSubType(Guid? id, CreateClubMembershipSubType.Command command) : base(id)
+        public ClubMembershipSubType(Guid id, CreateClubMembershipSubType.Command command) : base(id)
         {
             MemberhsipTypeId = command.MemberhsipTypeId;
             Name = command.Name;
diff --git a/Orso.Arpa.Domain/LocalizationDomain/Model/Localization.cs b/Orso.Arpa.Domain/LocalizationDomain/Model/Localization.cs
index de65e6446..eabb6c86e 100644
--- a/Orso.Arpa.Domain/LocalizationDomain/Model/Localization.cs
+++ b/Orso.Arpa.Domain/LocalizationDomain/Model/Localization.cs
@@ -5,7 +5,7 @@ namespace Orso.Arpa.Domain.LocalizationDomain.Model
 {
     public class Localization : BaseEntity
     {
-        public Localization(Guid? id, string key, string text, string localizationCulture, string resourceKey) : base(id)
+        public Localization(Guid id, string key, string text, string localizationCulture, string resourceKey) : base(id)
         {
             Key = key;
             Text = text;
diff --git a/Orso.Arpa.Domain/MusicianProfileDomain/Model/CurriculumVitaeReference.cs b/Orso.Arpa.Domain/MusicianProfileDomain/Model/CurriculumVitaeReference.cs
index 28a6aba98..318a8798a 100644
--- a/Orso.Arpa.Domain/MusicianProfileDomain/Model/CurriculumVitaeReference.cs
+++ b/Orso.Arpa.Domain/MusicianProfileDomain/Model/CurriculumVitaeReference.cs
@@ -8,7 +8,7 @@ namespace Orso.Arpa.Domain.MusicianProfileDomain.Model
 {
     public class CurriculumVitaeReference : BaseEntity
     {
-        public CurriculumVitaeReference(Guid? id, CreateCurriculumVitaeReference.Command command) : base(id)
+        public CurriculumVitaeReference(Guid id, CreateCurriculumVitaeReference.Command command) : base(id)
         {
             TimeSpan = command.TimeSpan;
             Institution = command.Institution;
@@ -18,7 +18,7 @@ public CurriculumVitaeReference(Guid? id, CreateCurriculumVitaeReference.Command
             MusicianProfileId = command.MusicianProfileId;
         }
 
-        internal CurriculumVitaeReference(Guid? id) : base(id)
+        internal CurriculumVitaeReference(Guid id) : base(id)
         {
         }
 
diff --git a/Orso.Arpa.Domain/MusicianProfileDomain/Model/Education.cs b/Orso.Arpa.Domain/MusicianProfileDomain/Model/Education.cs
index 0992057d8..63719a218 100644
--- a/Orso.Arpa.Domain/MusicianProfileDomain/Model/Education.cs
+++ b/Orso.Arpa.Domain/MusicianProfileDomain/Model/Education.cs
@@ -8,7 +8,7 @@ namespace Orso.Arpa.Domain.MusicianProfileDomain.Model
 {
     public class Education : BaseEntity
     {
-        public Education(Guid? id, CreateEducation.Command command) : base(id)
+        public Education(Guid id, CreateEducation.Command command) : base(id)
         {
             TimeSpan = command.TimeSpan;
             Institution = command.Institution;
@@ -18,7 +18,7 @@ public Education(Guid? id, CreateEducation.Command command) : base(id)
             MusicianProfileId = command.MusicianProfileId;
         }
 
-        internal Education(Guid? id) : base(id)
+        internal Education(Guid id) : base(id)
         {
         }
 
diff --git a/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfile.cs b/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfile.cs
index 55131bf02..2d798fa9a 100644
--- a/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfile.cs
+++ b/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfile.cs
@@ -15,7 +15,7 @@ namespace Orso.Arpa.Domain.MusicianProfileDomain.Model
 {
     public class MusicianProfile : BaseEntity
     {
-        public MusicianProfile(CreateMusicianProfile.Command command, bool isMainProfile, Guid? id = null) : base(id)
+        public MusicianProfile(CreateMusicianProfile.Command command, bool isMainProfile, Guid? id = null) : base(id ?? Guid.NewGuid())
         {
             LevelAssessmentInner = command.LevelAssessmentInner;
             LevelAssessmentTeam = command.LevelAssessmentTeam;
diff --git a/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfileDeactivation.cs b/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfileDeactivation.cs
index e1f682483..ff975d5e8 100644
--- a/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfileDeactivation.cs
+++ b/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfileDeactivation.cs
@@ -9,7 +9,7 @@ namespace Orso.Arpa.Domain.MusicianProfileDomain.Model
     [HardDelete]
     public class MusicianProfileDeactivation : BaseEntity
     {
-        public MusicianProfileDeactivation(Guid? id, CreateMusicianProfileDeactivation.Command command) : base(id)
+        public MusicianProfileDeactivation(Guid id, CreateMusicianProfileDeactivation.Command command) : base(id)
         {
             DeactivationStart = command.DeactivationStart;
             Purpose = command.Purpose;
diff --git a/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfileDocument.cs b/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfileDocument.cs
index 3d4a445ce..4b5da9764 100644
--- a/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfileDocument.cs
+++ b/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfileDocument.cs
@@ -6,13 +6,13 @@ namespace Orso.Arpa.Domain.MusicianProfileDomain.Model
 {
     public class MusicianProfileDocument : BaseEntity
     {
-        public MusicianProfileDocument(Guid? id, MusicianProfile musicianProfile, SelectValueMapping selectValueMapping) : base(id)
+        public MusicianProfileDocument(Guid? id, MusicianProfile musicianProfile, SelectValueMapping selectValueMapping) : base(id ?? Guid.NewGuid())
         {
             MusicianProfile = musicianProfile;
             SelectValueMapping = selectValueMapping;
         }
 
-        public MusicianProfileDocument(Guid musicianProfileId, Guid selectValueMappingId, Guid? id = null) : base(id)
+        public MusicianProfileDocument(Guid musicianProfileId, Guid selectValueMappingId, Guid? id = null) : base(id ?? Guid.NewGuid())
         {
             MusicianProfileId = musicianProfileId;
             SelectValueMappingId = selectValueMappingId;
diff --git a/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfilePositionInner.cs b/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfilePositionInner.cs
index 1a6a92d54..dc446ee42 100644
--- a/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfilePositionInner.cs
+++ b/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfilePositionInner.cs
@@ -6,7 +6,7 @@ namespace Orso.Arpa.Domain.MusicianProfileDomain.Model
 {
     public class MusicianProfilePositionInner : BaseEntity
     {
-        public MusicianProfilePositionInner(Guid selectValueSectionId, Guid musicianProfileId, Guid? id = null) : base(id)
+        public MusicianProfilePositionInner(Guid selectValueSectionId, Guid musicianProfileId, Guid? id = null)  : base(id ?? Guid.NewGuid())
         {
             SelectValueSectionId = selectValueSectionId;
             MusicianProfileId = musicianProfileId;
diff --git a/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfilePositionTeam.cs b/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfilePositionTeam.cs
index c24497bf2..e2593d637 100644
--- a/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfilePositionTeam.cs
+++ b/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfilePositionTeam.cs
@@ -6,7 +6,7 @@ namespace Orso.Arpa.Domain.MusicianProfileDomain.Model
 {
     public class MusicianProfilePositionTeam : BaseEntity
     {
-        public MusicianProfilePositionTeam(Guid selectValueSectionId, Guid musicianProfileId, Guid? id = null) : base(id)
+        public MusicianProfilePositionTeam(Guid selectValueSectionId, Guid musicianProfileId, Guid? id = null) : base(id ?? Guid.NewGuid())
         {
             SelectValueSectionId = selectValueSectionId;
             MusicianProfileId = musicianProfileId;
diff --git a/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfileSection.cs b/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfileSection.cs
index 485aa3bc8..e97ea7259 100644
--- a/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfileSection.cs
+++ b/Orso.Arpa.Domain/MusicianProfileDomain/Model/MusicianProfileSection.cs
@@ -12,7 +12,7 @@ protected MusicianProfileSection()
         {
         }
 
-        public MusicianProfileSection(Guid? id, CreateMusicianProfileSection.Command command) : base(id)
+        public MusicianProfileSection(Guid id, CreateMusicianProfileSection.Command command) : base(id)
         {
             LevelAssessmentInner = command.LevelAssessmentInner;
             LevelAssessmentTeam = command.LevelAssessmentTeam;
diff --git a/Orso.Arpa.Domain/MusicianProfileDomain/Model/PreferredGenre.cs b/Orso.Arpa.Domain/MusicianProfileDomain/Model/PreferredGenre.cs
index 161950891..212db9ca2 100644
--- a/Orso.Arpa.Domain/MusicianProfileDomain/Model/PreferredGenre.cs
+++ b/Orso.Arpa.Domain/MusicianProfileDomain/Model/PreferredGenre.cs
@@ -6,7 +6,7 @@ namespace Orso.Arpa.Domain.MusicianProfileDomain.Model
 {
     public class PreferredGenre : BaseEntity
     {
-        public PreferredGenre(Guid? id, MusicianProfile musicianProfile, SelectValueMapping selectValueMapping) : base(id)
+        public PreferredGenre(Guid id, MusicianProfile musicianProfile, SelectValueMapping selectValueMapping) : base(id)
         {
             MusicianProfile = musicianProfile;
             SelectValueMapping = selectValueMapping;
diff --git a/Orso.Arpa.Domain/NewsDomain/Model/News.cs b/Orso.Arpa.Domain/NewsDomain/Model/News.cs
index 61b46975f..32029417c 100644
--- a/Orso.Arpa.Domain/NewsDomain/Model/News.cs
+++ b/Orso.Arpa.Domain/NewsDomain/Model/News.cs
@@ -6,7 +6,7 @@ namespace Orso.Arpa.Domain.NewsDomain.Model;
 
 public class News : BaseEntity
 {
-    public News(Guid? id, CreateNews.Command command) : base(id)
+    public News(Guid id, CreateNews.Command command) : base(id)
     {
         Title = command.Title;
         Content = command.Content;
diff --git a/Orso.Arpa.Domain/PersonDomain/Model/BankAccount.cs b/Orso.Arpa.Domain/PersonDomain/Model/BankAccount.cs
index 271696a82..1db4b7221 100644
--- a/Orso.Arpa.Domain/PersonDomain/Model/BankAccount.cs
+++ b/Orso.Arpa.Domain/PersonDomain/Model/BankAccount.cs
@@ -7,7 +7,7 @@ namespace Orso.Arpa.Domain.PersonDomain.Model
 {
     public class BankAccount : BaseEntity
     {
-        public BankAccount(Guid? id, CreateBankAccount.Command command) : base(id)
+        public BankAccount(Guid id, CreateBankAccount.Command command) : base(id)
         {
             Iban = command.Iban;
             Bic = command.Bic;
diff --git a/Orso.Arpa.Domain/PersonDomain/Model/ContactDetail.cs b/Orso.Arpa.Domain/PersonDomain/Model/ContactDetail.cs
index 46578fb67..99c2ca115 100644
--- a/Orso.Arpa.Domain/PersonDomain/Model/ContactDetail.cs
+++ b/Orso.Arpa.Domain/PersonDomain/Model/ContactDetail.cs
@@ -8,7 +8,7 @@ namespace Orso.Arpa.Domain.PersonDomain.Model
 {
     public class ContactDetail : BaseEntity
     {
-        public ContactDetail(Guid? id, CreateContactDetail.Command command) : base(id)
+        public ContactDetail(Guid? id, CreateContactDetail.Command command) : base(id ?? Guid.NewGuid())
         {
             Key = command.Key;
             Value = command.Value;
@@ -18,7 +18,7 @@ public ContactDetail(Guid? id, CreateContactDetail.Command command) : base(id)
             PersonId = command.PersonId;
         }
 
-        public ContactDetail(Guid? id, CreateMyContactDetail.Command command) : base(id)
+        public ContactDetail(Guid id, CreateMyContactDetail.Command command) : base(id)
         {
             Key = command.Key;
             Value = command.Value;
diff --git a/Orso.Arpa.Domain/PersonDomain/Model/Person.cs b/Orso.Arpa.Domain/PersonDomain/Model/Person.cs
index a20d29d5a..e69eb472d 100644
--- a/Orso.Arpa.Domain/PersonDomain/Model/Person.cs
+++ b/Orso.Arpa.Domain/PersonDomain/Model/Person.cs
@@ -17,7 +17,7 @@ namespace Orso.Arpa.Domain.PersonDomain.Model
 {
     public class Person : BaseEntity
     {
-        public Person(Guid? id, CreatePerson.Command command) : base(id)
+        public Person(Guid id, CreatePerson.Command command) : base(id)
         {
             GivenName = command.GivenName;
             Surname = command.Surname;
@@ -33,7 +33,7 @@ public Person(Guid? id, CreatePerson.Command command) : base(id)
             GeneralPreference = command.GeneralPreference;
         }
 
-        public Person(Guid? id, RegisterUser.Command command) : base(id)
+        public Person(Guid id, RegisterUser.Command command) : base(id)
         {
             GivenName = command.GivenName;
             Surname = command.Surname;
diff --git a/Orso.Arpa.Domain/PersonDomain/Model/PersonSection.cs b/Orso.Arpa.Domain/PersonDomain/Model/PersonSection.cs
index 1e8c6a642..033a73aa8 100644
--- a/Orso.Arpa.Domain/PersonDomain/Model/PersonSection.cs
+++ b/Orso.Arpa.Domain/PersonDomain/Model/PersonSection.cs
@@ -6,13 +6,13 @@ namespace Orso.Arpa.Domain.PersonDomain.Model
 {
     public class PersonSection : BaseEntity
     {
-        public PersonSection(Guid? id, Person person, Section section) : base(id)
+        public PersonSection(Guid? id, Person person, Section section) : base(id ?? Guid.NewGuid())
         {
             Person = person;
             Section = section;
         }
 
-        public PersonSection(Guid? id, Guid personId, Guid sectionId) : base(id)
+        public PersonSection(Guid? id, Guid personId, Guid sectionId) : base(id ?? Guid.NewGuid())
         {
             PersonId = personId;
             SectionId = sectionId;
diff --git a/Orso.Arpa.Domain/ProjectDomain/Model/Project.cs b/Orso.Arpa.Domain/ProjectDomain/Model/Project.cs
index f75b20733..de1e8718a 100644
--- a/Orso.Arpa.Domain/ProjectDomain/Model/Project.cs
+++ b/Orso.Arpa.Domain/ProjectDomain/Model/Project.cs
@@ -11,7 +11,7 @@ namespace Orso.Arpa.Domain.ProjectDomain.Model
 {
     public class Project : BaseEntity
     {
-        public Project(Guid? id, CreateProject.Command command) : base(id)
+        public Project(Guid id, CreateProject.Command command) : base(id)
         {
             Title = command.Title;
             ShortTitle = command.ShortTitle;
diff --git a/Orso.Arpa.Domain/ProjectDomain/Model/ProjectAppointment.cs b/Orso.Arpa.Domain/ProjectDomain/Model/ProjectAppointment.cs
index bc9bfe248..940621dd7 100644
--- a/Orso.Arpa.Domain/ProjectDomain/Model/ProjectAppointment.cs
+++ b/Orso.Arpa.Domain/ProjectDomain/Model/ProjectAppointment.cs
@@ -6,13 +6,13 @@ namespace Orso.Arpa.Domain.ProjectDomain.Model
 {
     public class ProjectAppointment : BaseEntity
     {
-        public ProjectAppointment(Guid? id, Project project, Appointment appointment) : base(id)
+        public ProjectAppointment(Guid? id, Project project, Appointment appointment) : base(id ?? Guid.NewGuid())
         {
             Project = project;
             Appointment = appointment;
         }
 
-        public ProjectAppointment(Guid? id, Guid projectId, Guid appointmentId) : base(id)
+        public ProjectAppointment(Guid id, Guid projectId, Guid appointmentId) : base(id)
         {
             ProjectId = projectId;
             AppointmentId = appointmentId;
diff --git a/Orso.Arpa.Domain/ProjectDomain/Model/ProjectParticipation.cs b/Orso.Arpa.Domain/ProjectDomain/Model/ProjectParticipation.cs
index c3c99d221..5043623f0 100644
--- a/Orso.Arpa.Domain/ProjectDomain/Model/ProjectParticipation.cs
+++ b/Orso.Arpa.Domain/ProjectDomain/Model/ProjectParticipation.cs
@@ -9,7 +9,7 @@ namespace Orso.Arpa.Domain.ProjectDomain.Model
 {
     public class ProjectParticipation : BaseEntity
     {
-        public ProjectParticipation(SetProjectParticipation.Command command, Guid? id = null) : base(id)
+        public ProjectParticipation(SetProjectParticipation.Command command, Guid? id = null) : base(id ?? Guid.NewGuid())
         {
             ProjectId = command.ProjectId;
             MusicianProfileId = command.MusicianProfileId;
@@ -20,7 +20,7 @@ public ProjectParticipation(SetProjectParticipation.Command command, Guid? id =
             ParticipationStatusInternal = command.ParticipationStatusInternal;
         }
 
-        public ProjectParticipation(SetMyProjectParticipationStatus.Command command, Guid? id = null) : base(id)
+        public ProjectParticipation(SetMyProjectParticipationStatus.Command command, Guid? id = null) : base(id ?? Guid.NewGuid())
         {
             ProjectId = command.ProjectId;
             MusicianProfileId = command.MusicianProfileId;
@@ -84,7 +84,7 @@ public ProjectParticipationStatusResult ParticipationStatusResult
             }
         }
 
-        private bool HasAtLeastOneRefusalStatus => 
+        private bool HasAtLeastOneRefusalStatus =>
                 ProjectParticipationStatusInner.Refusal.Equals(ParticipationStatusInner)
                 || ProjectParticipationStatusInner.RehearsalsOnly.Equals(ParticipationStatusInner)
                 || ProjectParticipationStatusInternal.Refusal.Equals(ParticipationStatusInternal);
diff --git a/Orso.Arpa.Domain/ProjectDomain/Model/Url.cs b/Orso.Arpa.Domain/ProjectDomain/Model/Url.cs
index 982a9a168..f42206bfc 100644
--- a/Orso.Arpa.Domain/ProjectDomain/Model/Url.cs
+++ b/Orso.Arpa.Domain/ProjectDomain/Model/Url.cs
@@ -9,14 +9,14 @@ namespace Orso.Arpa.Domain.ProjectDomain.Model
 {
     public class Url : BaseEntity
     {
-        public Url(Guid? id, CreateUrl.Command command) : base(id)
+        public Url(Guid id, CreateUrl.Command command) : base(id)
         {
             Href = command.Href;
             AnchorText = command.AnchorText;
             ProjectId = command.ProjectId;
         }
 
-        internal Url(Guid? id) : base(id)
+        internal Url(Guid id) : base(id)
         {
         }
 
diff --git a/Orso.Arpa.Domain/ProjectDomain/Model/UrlRole.cs b/Orso.Arpa.Domain/ProjectDomain/Model/UrlRole.cs
index 789c9c548..3c44c2c1a 100644
--- a/Orso.Arpa.Domain/ProjectDomain/Model/UrlRole.cs
+++ b/Orso.Arpa.Domain/ProjectDomain/Model/UrlRole.cs
@@ -6,7 +6,7 @@ namespace Orso.Arpa.Domain.ProjectDomain.Model
 {
     public class UrlRole : BaseEntity
     {
-        public UrlRole(Guid? id, Url url, Role role) : base(id)
+        public UrlRole(Guid? id, Url url, Role role) : base(id ?? Guid.NewGuid())
         {
             Url = url;
             Role = role;
diff --git a/Orso.Arpa.Domain/RegionDomain/Model/Region.cs b/Orso.Arpa.Domain/RegionDomain/Model/Region.cs
index 4d50be9ca..a094251e9 100644
--- a/Orso.Arpa.Domain/RegionDomain/Model/Region.cs
+++ b/Orso.Arpa.Domain/RegionDomain/Model/Region.cs
@@ -8,7 +8,7 @@ namespace Orso.Arpa.Domain.RegionDomain.Model
 {
     public class Region : BaseEntity
     {
-        public Region(Guid? id, CreateRegion.Command command) : base(id)
+        public Region(Guid id, CreateRegion.Command command) : base(id)
         {
             Name = command.Name;
             IsForPerformance = command.IsForPerformance;
diff --git a/Orso.Arpa.Domain/RegionDomain/Model/RegionPreference.cs b/Orso.Arpa.Domain/RegionDomain/Model/RegionPreference.cs
index 1c8709bfc..4f53d23cd 100644
--- a/Orso.Arpa.Domain/RegionDomain/Model/RegionPreference.cs
+++ b/Orso.Arpa.Domain/RegionDomain/Model/RegionPreference.cs
@@ -8,7 +8,7 @@ namespace Orso.Arpa.Domain.RegionDomain.Model
 {
     public class RegionPreference : BaseEntity
     {
-        public RegionPreference(Guid? id, CreateMyRegionPreference.Command command) : base(id)
+        public RegionPreference(Guid id, CreateMyRegionPreference.Command command) : base(id)
         {
             RegionId = command.RegionId;
             MusicianProfileId = command.MusicianProfileId;
diff --git a/Orso.Arpa.Domain/SectionDomain/Model/Section.cs b/Orso.Arpa.Domain/SectionDomain/Model/Section.cs
index 4563a2d3c..84b2b8f6b 100644
--- a/Orso.Arpa.Domain/SectionDomain/Model/Section.cs
+++ b/Orso.Arpa.Domain/SectionDomain/Model/Section.cs
@@ -11,7 +11,7 @@ namespace Orso.Arpa.Domain.SectionDomain.Model
 {
     public class Section : BaseEntity
     {
-        public Section(Guid? id, string name, Guid? parentId, bool isInstrument, byte instrumentPartCount = 0) : base(id)
+        public Section(Guid id, string name, Guid? parentId, bool isInstrument, byte instrumentPartCount = 0) : base(id)
         {
             Name = name;
             ParentId = parentId;
diff --git a/Orso.Arpa.Domain/SectionDomain/Model/SectionAppointment.cs b/Orso.Arpa.Domain/SectionDomain/Model/SectionAppointment.cs
index a8000a728..8c9b7cac6 100644
--- a/Orso.Arpa.Domain/SectionDomain/Model/SectionAppointment.cs
+++ b/Orso.Arpa.Domain/SectionDomain/Model/SectionAppointment.cs
@@ -6,13 +6,13 @@ namespace Orso.Arpa.Domain.SectionDomain.Model
 {
     public class SectionAppointment : BaseEntity
     {
-        public SectionAppointment(Guid? id, Section section, Appointment appointment) : base(id)
+        public SectionAppointment(Guid? id, Section section, Appointment appointment) : base(id ?? Guid.NewGuid())
         {
             Section = section;
             Appointment = appointment;
         }
 
-        public SectionAppointment(Guid? id, Guid sectionId, Guid appointmentId) : base(id)
+        public SectionAppointment(Guid id, Guid sectionId, Guid appointmentId) : base(id)
         {
             SectionId = sectionId;
             AppointmentId = appointmentId;
diff --git a/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValue.cs b/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValue.cs
index 6cce0cfe7..2c7c2f907 100644
--- a/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValue.cs
+++ b/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValue.cs
@@ -7,7 +7,7 @@ namespace Orso.Arpa.Domain.SelectValueDomain.Model
 {
     public class SelectValue : BaseEntity
     {
-        public SelectValue(Guid? id, string name, string description) : base(id)
+        public SelectValue(Guid id, string name, string description) : base(id)
         {
             Name = name;
             Description = description;
diff --git a/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValueCategory.cs b/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValueCategory.cs
index bb82cd847..060f2ed3e 100644
--- a/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValueCategory.cs
+++ b/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValueCategory.cs
@@ -7,7 +7,7 @@ namespace Orso.Arpa.Domain.SelectValueDomain.Model
 {
     public class SelectValueCategory : BaseEntity
     {
-        internal SelectValueCategory(Guid? id, string table, string property, string name) : base(id)
+        internal SelectValueCategory(Guid id, string table, string property, string name) : base(id)
         {
             Table = table;
             Property = property;
diff --git a/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValueMapping.cs b/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValueMapping.cs
index ba41031c6..3982ca4b2 100644
--- a/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValueMapping.cs
+++ b/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValueMapping.cs
@@ -5,7 +5,7 @@ namespace Orso.Arpa.Domain.SelectValueDomain.Model
 {
     public class SelectValueMapping : BaseEntity
     {
-        public SelectValueMapping(Guid? id, Guid selectValueCategoryId, Guid selectValueId, int? sortOrder = null) : base(id)
+        public SelectValueMapping(Guid id, Guid selectValueCategoryId, Guid selectValueId, int? sortOrder = null) : base(id)
         {
             SelectValueCategoryId = selectValueCategoryId;
             SelectValueId = selectValueId;
diff --git a/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValueSection.cs b/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValueSection.cs
index 784330f62..fb74f7e35 100644
--- a/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValueSection.cs
+++ b/Orso.Arpa.Domain/SelectValueDomain/Model/SelectValueSection.cs
@@ -9,7 +9,7 @@ namespace Orso.Arpa.Domain.SelectValueDomain.Model
 {
     public class SelectValueSection : BaseEntity
     {
-        public SelectValueSection(Guid? id, Guid sectionId, Guid selectValueId) : base(id)
+        public SelectValueSection(Guid id, Guid sectionId, Guid selectValueId) : base(id)
         {
             SectionId = sectionId;
             SelectValueId = selectValueId;
diff --git a/Orso.Arpa.Domain/UserDomain/Model/UserRole.cs b/Orso.Arpa.Domain/UserDomain/Model/UserRole.cs
index 3acc72851..59686e380 100644
--- a/Orso.Arpa.Domain/UserDomain/Model/UserRole.cs
+++ b/Orso.Arpa.Domain/UserDomain/Model/UserRole.cs
@@ -1,8 +1,5 @@
 using System;
-using System.Collections.Generic;
 using Microsoft.AspNetCore.Identity;
-using Orso.Arpa.Domain.General.Attributes;
-using Orso.Arpa.Domain.ProjectDomain.Model;
 
 namespace Orso.Arpa.Domain.UserDomain.Model
 {
diff --git a/Orso.Arpa.Domain/VenueDomain/Commands/CreateVenue.cs b/Orso.Arpa.Domain/VenueDomain/Commands/CreateVenue.cs
index 5633679b6..fde6d1e37 100644
--- a/Orso.Arpa.Domain/VenueDomain/Commands/CreateVenue.cs
+++ b/Orso.Arpa.Domain/VenueDomain/Commands/CreateVenue.cs
@@ -11,7 +11,7 @@ public class Command : BaseAddressCreateCommand, ICreateCommand<Venue>
         {
             public string Name { get; set; }
             public string Description { get; set; }
-            public Guid? AddressId { get; set; }
+            public Guid AddressId { get; set; }
         }
     }
 }
diff --git a/Orso.Arpa.Domain/VenueDomain/Model/Room.cs b/Orso.Arpa.Domain/VenueDomain/Model/Room.cs
index a8b33d13f..b5d781e91 100644
--- a/Orso.Arpa.Domain/VenueDomain/Model/Room.cs
+++ b/Orso.Arpa.Domain/VenueDomain/Model/Room.cs
@@ -12,7 +12,7 @@ namespace Orso.Arpa.Domain.VenueDomain.Model
 {
     public class Room : BaseEntity
     {
-        public Room(Guid? id, CreateRoom.Command command) : base(id)
+        public Room(Guid id, CreateRoom.Command command) : base(id)
         {
             VenueId = command.VenueId;
             Building = command.Building;
diff --git a/Orso.Arpa.Domain/VenueDomain/Model/RoomEquipment.cs b/Orso.Arpa.Domain/VenueDomain/Model/RoomEquipment.cs
index 1cfb530a0..ba19ec0db 100644
--- a/Orso.Arpa.Domain/VenueDomain/Model/RoomEquipment.cs
+++ b/Orso.Arpa.Domain/VenueDomain/Model/RoomEquipment.cs
@@ -7,7 +7,7 @@ namespace Orso.Arpa.Domain.VenueDomain.Model
 {
     public class RoomEquipment : BaseEntity
     {
-        public RoomEquipment(Guid? id, SelectValueMapping equipment, Room room, int? count, string description = null) : base(id)
+        public RoomEquipment(Guid id, SelectValueMapping equipment, Room room, int? count, string description = null) : base(id)
         {
             Equipment = equipment;
             Room = room;
@@ -15,7 +15,7 @@ public RoomEquipment(Guid? id, SelectValueMapping equipment, Room room, int? cou
             Description = description;
         }
 
-        public RoomEquipment(Guid? id, CreateRoomEquipment.Command command) : base(id)
+        public RoomEquipment(Guid id, CreateRoomEquipment.Command command) : base(id)
         {
             EquipmentId = command.EquipmentId;
             RoomId = command.RoomId;
@@ -32,7 +32,7 @@ public void Update (ModifyRoomEquipment.Command command)
             Quantity = command.Quantity;
             Description = command.Description;
         }
-        
+
         public Guid? EquipmentId { get; private set; }
         public virtual SelectValueMapping Equipment { get; private set; }
         public Guid? RoomId { get; private set; }
@@ -40,4 +40,4 @@ public void Update (ModifyRoomEquipment.Command command)
         public int? Quantity { get; private set; }
         public string Description { get; private set; }
     }
-}
\ No newline at end of file
+}
diff --git a/Orso.Arpa.Domain/VenueDomain/Model/RoomSection.cs b/Orso.Arpa.Domain/VenueDomain/Model/RoomSection.cs
index e4a553f84..f198480b1 100644
--- a/Orso.Arpa.Domain/VenueDomain/Model/RoomSection.cs
+++ b/Orso.Arpa.Domain/VenueDomain/Model/RoomSection.cs
@@ -10,7 +10,7 @@ namespace Orso.Arpa.Domain.VenueDomain.Model
     /// </summary>
     public class RoomSection : BaseEntity
     {
-        public RoomSection(Guid? id, Section section, Room room, int? count, string description) : base(id)
+        public RoomSection(Guid id, Section section, Room room, int? count, string description) : base(id)
         {
             Section = section;
             Room = room;
@@ -18,7 +18,7 @@ public RoomSection(Guid? id, Section section, Room room, int? count, string desc
             Description = description;
         }
 
-        public RoomSection(Guid? id, CreateRoomSection.Command command) : base(id)
+        public RoomSection(Guid id, CreateRoomSection.Command command) : base(id)
         {
             SectionId = command.SectionId;
             RoomId = command.RoomId;
@@ -43,4 +43,4 @@ public void Update (ModifyRoomSection.Command command)
         public int? Quantity { get; private set; }
         public string Description { get; set; }
     }
-}
\ No newline at end of file
+}
diff --git a/Orso.Arpa.Domain/VenueDomain/Model/Venue.cs b/Orso.Arpa.Domain/VenueDomain/Model/Venue.cs
index c071d4218..f1893abd5 100644
--- a/Orso.Arpa.Domain/VenueDomain/Model/Venue.cs
+++ b/Orso.Arpa.Domain/VenueDomain/Model/Venue.cs
@@ -11,7 +11,7 @@ namespace Orso.Arpa.Domain.VenueDomain.Model
 {
     public class Venue : BaseEntity
     {
-        public Venue(Guid? id, CreateVenue.Command command) : base(id)
+        public Venue(Guid id, CreateVenue.Command command) : base(id)
         {
             Name = command.Name;
             Description = command.Description;
diff --git a/Orso.Arpa.Domain/_General/Model/BaseEntity.cs b/Orso.Arpa.Domain/_General/Model/BaseEntity.cs
index 1a8f7e8a2..d1ab2cb28 100644
--- a/Orso.Arpa.Domain/_General/Model/BaseEntity.cs
+++ b/Orso.Arpa.Domain/_General/Model/BaseEntity.cs
@@ -16,13 +16,14 @@ public abstract class BaseEntity
         public DateTime? ModifiedAt { get; private set; }
         public bool Deleted { get; private set; }
 
-        protected BaseEntity(Guid? id)
+        protected BaseEntity(Guid id)
         {
-            Id = id ?? Guid.NewGuid();
+            Id = id;
         }
 
         protected BaseEntity()
         {
+            Id = Guid.NewGuid();
         }
 
         public virtual void Create(string createdBy, DateTime createdAt)
diff --git a/Orso.Arpa.Misc/Extensions/StringExtensions.cs b/Orso.Arpa.Misc/Extensions/StringExtensions.cs
index bc1b377ee..5c0208a0c 100644
--- a/Orso.Arpa.Misc/Extensions/StringExtensions.cs
+++ b/Orso.Arpa.Misc/Extensions/StringExtensions.cs
@@ -1,3 +1,6 @@
+using System;
+using System.Security.Cryptography;
+using System.Text;
 using System.Text.RegularExpressions;
 
 namespace Orso.Arpa.Misc
@@ -33,5 +36,12 @@ public static string FormatLink(this string href, string label)
         {
             return $"<{href}|{label}>";
         }
+
+        public static Guid CreateGuid(this string str)
+        {
+            if(string.IsNullOrWhiteSpace(str)) { return Guid.Empty; }
+            byte[] hash = MD5.HashData(Encoding.UTF8.GetBytes(str));
+            return new Guid(hash);
+        }
     }
 }
diff --git a/Orso.Arpa.Persistence/README.MD b/Orso.Arpa.Persistence/README.MD
index 9b886bdc5..cffc6848c 100644
--- a/Orso.Arpa.Persistence/README.MD
+++ b/Orso.Arpa.Persistence/README.MD
@@ -36,6 +36,7 @@ Update tools to the most recent version: `dotnet tool update --global dotnet-ef`
 ### Add New Migration
 
 You may be forced to remove `${aspnet-request-posted-body-shadowed}` from appsettings(.Development).json to make this work.
+<NameOfMigration should start with an uppercase letter to prevent warnings>
 ```
 dotnet ef migrations add "<NameOfMigration>" -s Orso.Arpa.Api/ -p Orso.Arpa.Persistence/ -c ArpaContext
 ```
diff --git a/Orso.Arpa.Persistence/Seed/ClubMembershipSubTypeSeedData.cs b/Orso.Arpa.Persistence/Seed/ClubMembershipSubTypeSeedData.cs
index f01b8810a..d02496b59 100644
--- a/Orso.Arpa.Persistence/Seed/ClubMembershipSubTypeSeedData.cs
+++ b/Orso.Arpa.Persistence/Seed/ClubMembershipSubTypeSeedData.cs
@@ -12,12 +12,13 @@ public static class ClubMembershipSubTypeSeedData
     {
         public static List<ClubMembershipSubType> ClubMembershipSubTypes
         {
-        get {
-            return [
-                        .. ClubMembershipSubTypesFreiburg,
+            get
+            {
+                return [
+                            .. ClubMembershipSubTypesFreiburg,
                         .. ClubMembershipSubTypesStuttgart,
                         .. ClubMembershipSubTypeBerlin
-                    ];
+                        ];
             }
         }
 
@@ -132,13 +133,13 @@ .. ClubMembershipSubTypeBerlin
 
         #region Stuttgart
         public static ClubMembershipSubType StuttgartFull => new ClubMembershipSubType(
-Guid.Parse("80f328c9-48c9-4d72-9811-e3b93afae405"),
-new CreateClubMembershipSubType.Command
-{
-    Name = "Vollmitgliedschaft",
-    MemberhsipTypeId = ClubMembershipTypeSeedData.Stuttgart.Id
-}
-);
+            Guid.Parse("80f328c9-48c9-4d72-9811-e3b93afae405"),
+            new CreateClubMembershipSubType.Command
+            {
+                Name = "Vollmitgliedschaft",
+                MemberhsipTypeId = ClubMembershipTypeSeedData.Stuttgart.Id
+            }
+        );
 
         public static ClubMembershipSubType StuttgartDiscounted => new ClubMembershipSubType(
             Guid.Parse("1435c3c5-6aaa-4b81-a269-f2b6f0e831b2"),
@@ -176,13 +177,13 @@ .. ClubMembershipSubTypeBerlin
 
         #region Berlin
         public static ClubMembershipSubType ChoirBerlinFull => new ClubMembershipSubType(
-    Guid.Parse("fd21006f-ec6b-41fb-b383-0a11f6623707"),
-    new CreateClubMembershipSubType.Command
-    {
-        Name = "Vollmitgliedschaft",
-        MemberhsipTypeId = ClubMembershipTypeSeedData.ChoirBerlin.Id
-    }
-);
+            Guid.Parse("fd21006f-ec6b-41fb-b383-0a11f6623707"),
+            new CreateClubMembershipSubType.Command
+            {
+                Name = "Vollmitgliedschaft",
+                MemberhsipTypeId = ClubMembershipTypeSeedData.ChoirBerlin.Id
+            }
+        );
 
         public static ClubMembershipSubType ChoirBerlinDiscounted => new ClubMembershipSubType(
             Guid.Parse("7cf3b7b1-c9df-49ea-b7d4-f1063900fb48"),
diff --git a/Orso.Arpa.Persistence/Seed/TranslationSeedData.cs b/Orso.Arpa.Persistence/Seed/TranslationSeedData.cs
index f7e7ae8a2..f0d04e4c9 100644
--- a/Orso.Arpa.Persistence/Seed/TranslationSeedData.cs
+++ b/Orso.Arpa.Persistence/Seed/TranslationSeedData.cs
@@ -5,6 +5,7 @@
 using System.Text.Encodings.Web;
 using System.Text.Json;
 using Orso.Arpa.Domain.LocalizationDomain.Model;
+using Orso.Arpa.Misc;
 
 namespace Orso.Arpa.Persistence.Seed
 {
@@ -77,7 +78,7 @@ private static List<Localization> ParseTranslations(string json, string culture)
             {
                 foreach (JsonProperty e in resourceKey.Value.EnumerateObject())
                 {
-                    translations.Add(new Localization(null, e.Name, e.Value.GetString(), culture, resourceKey.Name));
+                    translations.Add(new Localization(e.Name.CreateGuid(), e.Name, e.Value.GetString(), culture, resourceKey.Name));
                 }
             }
 
@@ -111,7 +112,7 @@ private static Localization ParseLocalization(JsonElement t)
             Guid id = t.TryGetProperty(nameof(Localization.Id), out element) ? element.GetGuid() : Guid.Empty;
             var createdBy = t.TryGetProperty(nameof(Localization.CreatedBy), out element) ? element.GetString() : null;
 
-            DateTime createdAt = DateTime.Now;
+            DateTime createdAt = DateTime.MinValue;
             if (t.TryGetProperty(nameof(Localization.CreatedAt), out element) && element.TryGetDateTime(out DateTime cdt))
             {
                 createdAt = cdt;
@@ -147,7 +148,7 @@ private static List<Localization> MergeTranslationToLocalization(IList<Localizat
                 {
                     if (!a.Deleted)
                     {
-                        a.Delete(nameof(LocalizationSeedData), DateTime.Now);
+                        a.Delete(nameof(LocalizationSeedData), DateTime.MinValue);
                     }
 
                     result.Add(a);
@@ -163,7 +164,7 @@ private static List<Localization> MergeTranslationToLocalization(IList<Localizat
                     // then check whether text changed.
                     if (!a.Text.Equals(translate.Text))
                     {
-                        updatedLocalization.Modify(nameof(LocalizationSeedData), DateTime.Now);
+                        updatedLocalization.Modify(nameof(LocalizationSeedData), DateTime.MinValue);
                     }
 
                     result.Add(updatedLocalization);
@@ -182,7 +183,7 @@ private static List<Localization> MergeTranslationToLocalization(IList<Localizat
                     var newLocalization = new Localization(b.Id, b.Key, b.Text,
                         b.LocalizationCulture, b.ResourceKey);
 
-                    newLocalization.Create(nameof(LocalizationSeedData), DateTime.Now);
+                    newLocalization.Create(nameof(LocalizationSeedData), DateTime.MinValue);
 
                     result.Add(newLocalization);
                 }
diff --git a/Tests/Orso.Arpa.Api.Tests/IntegrationTests/Shared/TestStartup.cs b/Tests/Orso.Arpa.Api.Tests/IntegrationTests/Shared/TestStartup.cs
index fbafdafe2..ec0b4a7a3 100644
--- a/Tests/Orso.Arpa.Api.Tests/IntegrationTests/Shared/TestStartup.cs
+++ b/Tests/Orso.Arpa.Api.Tests/IntegrationTests/Shared/TestStartup.cs
@@ -45,7 +45,7 @@ protected override void ConfigureDatabase(IServiceCollection services)
                 options.UseSnakeCaseNamingConvention();
                 options.EnableSensitiveDataLogging();
                 options.EnableDetailedErrors();
-                options.ConfigureWarnings(warnings => warnings.Ignore(RelationalEventId.PendingModelChangesWarning));
+               // options.ConfigureWarnings(warnings => warnings.Ignore(RelationalEventId.PendingModelChangesWarning));
             });
             services.AddPooledDbContextFactory<GraphQLContext>(opt =>
             {
diff --git a/Tests/Orso.Arpa.Misc.Tests/Extensions/StringExtensionsTests.cs b/Tests/Orso.Arpa.Misc.Tests/Extensions/StringExtensionsTests.cs
index 0bb33dc14..01ff69d28 100644
--- a/Tests/Orso.Arpa.Misc.Tests/Extensions/StringExtensionsTests.cs
+++ b/Tests/Orso.Arpa.Misc.Tests/Extensions/StringExtensionsTests.cs
@@ -1,4 +1,3 @@
-using System;
 using FluentAssertions;
 using NUnit.Framework;
 
@@ -18,6 +17,73 @@ public void ShouldRemoveNonAsciiCharacters()
 
             result.Should().Be("FaDiNa_Auswahl_2020-02-25_85836__A.Linsenmann.jpg");
         }
+
+        [Test]
+        public void CreateGuid_ShouldReturnEmptyGuid_WhenStringIsNull()
+        {
+            // Arrange
+            string? input = null;
+
+            // Act
+            Guid result = input.CreateGuid();
+
+            // Assert
+            result.Should().Be(Guid.Empty);
+        }
+
+        [Test]
+        public void CreateGuid_ShouldReturnEmptyGuid_WhenStringIsEmpty()
+        {
+            // Arrange
+            string input = string.Empty;
+
+            // Act
+            Guid result = input.CreateGuid();
+
+            // Assert
+            result.Should().Be(Guid.Empty);
+        }
+
+        [Test]
+        public void CreateGuid_ShouldReturnEmptyGuid_WhenStringIsWhitespace()
+        {
+            // Arrange
+            string input = "   ";
+
+            // Act
+            Guid result = input.CreateGuid();
+
+            // Assert
+            result.Should().Be(Guid.Empty);
+        }
+
+        [Test]
+        public void CreateGuid_ShouldReturnDeterministicGuid_WhenStringIsValid()
+        {
+            // Arrange
+            string input = "Hello world!";
+            Guid expectedGuid = Guid.Parse("9d26fb86-0d19-852c-f6e0-468ceca42a20");
+
+            // Act
+            Guid result = input.CreateGuid();
+
+            // Assert
+            result.Should().Be(expectedGuid);
+        }
+
+        [Test]
+        public void CreateGuid_ShouldReturnSameGuid_ForSameString()
+        {
+            // Arrange
+            string input = "sameString";
+
+            // Act
+            Guid result1 = input.CreateGuid();
+            Guid result2 = input.CreateGuid();
+
+            // Assert
+            result1.Should().Be(result2);
+        }
     }
 }
 
diff --git a/Tests/Orso.Arpa.Tests.Shared/TestSeedData/AppointmentSeedData.cs b/Tests/Orso.Arpa.Tests.Shared/TestSeedData/AppointmentSeedData.cs
index 7686fc6b6..ab48a7e58 100644
--- a/Tests/Orso.Arpa.Tests.Shared/TestSeedData/AppointmentSeedData.cs
+++ b/Tests/Orso.Arpa.Tests.Shared/TestSeedData/AppointmentSeedData.cs
@@ -115,7 +115,7 @@ public static Appointment AfterShowParty
                     Guid.Parse("0ce71f0f-26a1-4315-b1f2-0b27c20360fe"),
                     ProjectSeedData.RockingXMas.Id,
                     appointmentId));
-                appointment.AppointmentRooms.Add(new AppointmentRoom(appointmentId, RoomSeedData.AulaWeiherhofSchule.Id));
+                appointment.AppointmentRooms.Add(new AppointmentRoom(Guid.Parse("f240b0b6-811e-4e2e-b855-1ecdd7ef0467"), appointmentId, RoomSeedData.AulaWeiherhofSchule.Id));
                 appointment.SectionAppointments.Add(new SectionAppointment(
                     Guid.Parse("3f6f909d-0786-4bc8-88c7-98fa3316db00"),
                     SectionSeedData.Alto.Id,