Сообщения, доставка сообщений, фикс хэндшейков, буферная зона (для синхронмзации)

src/main/java/com/rosetta/im/database/entity/Group.java

@@ -0,0 +1,67 @@
+package com.rosetta.im.database.entity;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.rosetta.im.database.CreateUpdateEntity;
+import com.rosetta.im.database.converters.StringListConverter;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Convert;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+
+/**
+ * Сущность для групповых чатов.
+ */
+@Entity
+@Table(name = "groups")
+public class Group extends CreateUpdateEntity {
+
+    @Id
+	@GeneratedValue(strategy = GenerationType.IDENTITY)
+	private Long id;
+
+    @Column(name = "groupId")
+	private String groupId;
+
+	@Convert(converter = StringListConverter.class)
+	@Column(name = "membersPublicKeys", nullable = false)
+	private List<String> membersPublicKeys = new ArrayList<>();    
+
+	@Convert(converter = StringListConverter.class)
+	@Column(name = "bannedPublicKeys", nullable = false)
+	private List<String> bannedPublicKeys = new ArrayList<>();       
+    
+    public Long getId() {
+        return id;
+    }
+
+    public String getGroupId() {
+        return groupId;
+    }
+
+    public void setGroupId(String groupId) {
+        this.groupId = groupId;
+    }
+
+    public List<String> getMembersPublicKeys() {
+        return membersPublicKeys;
+    }
+
+    public void setMembersPublicKeys(List<String> membersPublicKeys) {
+        this.membersPublicKeys = membersPublicKeys;
+    }
+
+    public List<String> getBannedPublicKeys() {
+        return bannedPublicKeys;
+    }
+
+    public void setBannedPublicKeys(List<String> bannedPublicKeys) {
+        this.bannedPublicKeys = bannedPublicKeys;
+    }
+
+}