added Creating Groups to frontend and saving them in Database. Also prepared some Methods for Snapshot db

src/main/java/mops/gruppen2/domain/EventDTO.java

@@ -1,7 +1,6 @@
 package mops.gruppen2.domain;
 
 import lombok.Data;
-import lombok.Value;
 import org.springframework.data.annotation.Id;
 import org.springframework.data.relational.core.mapping.Table;
 
@@ -9,8 +8,8 @@ import org.springframework.data.relational.core.mapping.Table;
 @Data
 public class EventDTO {
     @Id
-    long event_id;
-    long group_id;
+    Long event_id;
+    Long group_id;
     String user_id;
     String event_payload;
 }

src/main/java/mops/gruppen2/domain/event/AddUserEvent.java

@@ -16,14 +16,14 @@ public class AddUserEvent extends Event {
     String familyname;
     String email;
 
-    public AddUserEvent(long event_id, long group_id, String user_id, String givenname, String familyname, String email) {
+    public AddUserEvent(Long event_id, Long group_id, String user_id, String givenname, String familyname, String email) {
         super(event_id, group_id, user_id);
         this.givenname = givenname;
         this.familyname = familyname;
         this.email = email;
     }
 
-    public AddUserEvent(long event_id, long group_id, User user) {
+    public AddUserEvent(Long event_id, Long group_id, User user) {
         super(event_id, group_id, user.getUser_id());
         this.givenname = user.getGivenname();
         this.familyname = user.getFamilyname();

src/main/java/mops/gruppen2/domain/event/CreateGroupEvent.java

@@ -11,9 +11,14 @@ public class CreateGroupEvent extends Event {
     String groupTitle;
     String groupDescription;
 
-    public CreateGroupEvent(long event_id, long group_id, String user_id, String groupTitle, String groupDescription) {
+    public CreateGroupEvent(long event_id, Long group_id, String user_id, String groupTitle, String groupDescription) {
         super(event_id, group_id, user_id);
         this.groupTitle = groupTitle;
         this.groupDescription = groupDescription;
     }
+    public CreateGroupEvent(Long group_id, String user_id, String groupTitle, String groupDescription) {
+        super(group_id, user_id);
+        this.groupTitle = groupTitle;
+        this.groupDescription = groupDescription;
+    }
 }

src/main/java/mops/gruppen2/domain/event/DeleteUserEvent.java

@@ -6,11 +6,9 @@ import lombok.*;
  * Entfernt ein einzelnes Mitglied einer Gruppe.
  */
 @Getter
-@AllArgsConstructor
-@NoArgsConstructor
 public class DeleteUserEvent extends Event {
 
-    public DeleteUserEvent(long event_id, long group_id, String user_id) {
+    public DeleteUserEvent(Long event_id, Long group_id, String user_id) {
         super(event_id, group_id, user_id);
     }
 }

src/main/java/mops/gruppen2/domain/event/Event.java

@@ -24,7 +24,12 @@ import lombok.NoArgsConstructor;
         @JsonSubTypes.Type(value = AddUserEvent.class, name = "UpdateRoleEvent"),
 })
 public class Event {
-    long event_id;
-    long group_id;
+    Long event_id;
+    Long group_id;
     String user_id;
+
+    public Event(Long group_id,String user_id){
+        this.group_id = group_id;
+        this.user_id = user_id;
+    }
 }

src/main/java/mops/gruppen2/domain/event/UpdateGroupDescriptionEvent.java

@@ -13,7 +13,7 @@ import lombok.NoArgsConstructor;
 public class UpdateGroupDescriptionEvent extends Event {
     String newGroupDescription;
 
-    public UpdateGroupDescriptionEvent(long event_id, long group_id, String user_id, String newGroupDescription) {
+    public UpdateGroupDescriptionEvent(Long event_id, Long group_id, String user_id, String newGroupDescription) {
         super(event_id, group_id, user_id);
         this.newGroupDescription = newGroupDescription;
     }

src/main/java/mops/gruppen2/domain/event/UpdateGroupTitleEvent.java

@@ -13,7 +13,7 @@ import lombok.NoArgsConstructor;
 public class UpdateGroupTitleEvent extends Event {
     String newGroupTitle;
 
-    public UpdateGroupTitleEvent(long event_id, long group_id, String user_id, String newGroupTitle) {
+    public UpdateGroupTitleEvent(Long event_id, Long group_id, String user_id, String newGroupTitle) {
         super(event_id, group_id, user_id);
         this.newGroupTitle = newGroupTitle;
     }

src/main/java/mops/gruppen2/domain/event/UpdateRoleEvent.java

@@ -13,7 +13,7 @@ public class UpdateRoleEvent extends Event {
 
     Role newRole;
 
-    public UpdateRoleEvent(long event_id, long group_id, String user_id, Role newRole) {
+    public UpdateRoleEvent(Long event_id, Long group_id, String user_id, Role newRole) {
         super(event_id, group_id, user_id);
 
         this.newRole = newRole;