feat: add Chat feature

SPCServer/springboot/src/main/java/com/lcaohoanq/shoppe/domain/chat/Attachment.java

@@ -0,0 +1,39 @@
+package com.lcaohoanq.shoppe.domain.chat;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.lcaohoanq.shoppe.base.entity.BaseEntity;
+import com.lcaohoanq.shoppe.metadata.MediaMeta;
+import jakarta.persistence.Column;
+import jakarta.persistence.Embedded;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.SequenceGenerator;
+import jakarta.persistence.Table;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@Entity
+@Table(name = "attachments")
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class Attachment {
+
+    @Id
+    @SequenceGenerator(name = "attachments_seq", sequenceName = "attachments_id_seq", allocationSize = 1)
+    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "attachments_seq")
+    @Column(name="id", unique=true, nullable=false)
+    @JsonProperty("id")
+    private Long id;
+
+    @Embedded
+    private MediaMeta mediaMeta;
+
+}

SPCServer/springboot/src/main/java/com/lcaohoanq/shoppe/domain/chat/ChatRoom.java

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+package com.lcaohoanq.shoppe.domain.chat;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.lcaohoanq.shoppe.base.entity.BaseEntity;
+import com.lcaohoanq.shoppe.domain.user.User;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.SequenceGenerator;
+import jakarta.persistence.Table;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@Entity
+@Table(name = "chat_rooms")
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class ChatRoom extends BaseEntity {
+
+    @Id
+    @SequenceGenerator(name = "chat_rooms_seq", sequenceName = "chat_rooms_id_seq", allocationSize = 1)
+    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "chat_rooms_seq")
+    @Column(name = "id", unique = true, nullable = false)
+    @JsonProperty("id")
+    private Long id;
+
+    @ManyToOne
+    @JoinColumn(name = "user_1_id", nullable = false)
+    private User user1;
+
+    @ManyToOne
+    @JoinColumn(name = "user_2_id", nullable = false)
+    private User user2;
+
+    @Column(name = "user1_typing_status")
+    private Boolean user1TypingStatus = false;
+
+    @Column(name = "user2_typing_status")
+    private Boolean user2TypingStatus = false;
+
+}

SPCServer/springboot/src/main/java/com/lcaohoanq/shoppe/domain/chat/Message.java

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+package com.lcaohoanq.shoppe.domain.chat;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.lcaohoanq.shoppe.base.entity.BaseEntity;
+import com.lcaohoanq.shoppe.domain.user.User;
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.OneToOne;
+import jakarta.persistence.SequenceGenerator;
+import jakarta.persistence.Table;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@Entity
+@Table(name = "messages")
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class Message extends BaseEntity {
+
+    @Id
+    @SequenceGenerator(name = "messages_seq", sequenceName = "messages_id_seq", allocationSize = 1)
+    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "messages_seq")
+    @Column(name="id", unique=true, nullable=false)
+    @JsonProperty("id")
+    private Long id;
+
+    @ManyToOne
+    @JoinColumn(name = "chat_room_id", nullable = false)
+    private ChatRoom chatRoom;
+
+    @OneToOne(cascade = CascadeType.ALL)  // If a message has one attachment
+    @JoinColumn(name = "attachment_id")
+    private Attachment attachment;
+
+    @ManyToOne
+    @JoinColumn(name = "user_id", nullable = false)
+    private User user;
+
+    @Column(name = "content", nullable = false)
+    private String content;  // Store the message text
+
+    @Column(name="is_read", nullable = false)
+    private Boolean isRead = false;
+
+    // Timestamps from BaseEntity are inherited
+}
+