revised includes edited user entity

src/main/java/com/safeqr/app/qrcode/entity/QRCode.java

@@ -0,0 +1,30 @@
+
+package com.safeqr.app.qrcode.entity;
+
+import jakarta.persistence.*;
+import lombok.Data;
+import org.hibernate.annotations.GenericGenerator;
+
+import java.util.UUID;
+
+@Entity
+@Table(name = "qr_code", schema = "safeqr")
+@Data
+public class QRCode {
+
+    @Id
+    @GeneratedValue(generator = "UUID")
+    @GenericGenerator(name = "UUID", strategy = "org.hibernate.id.UUIDGenerator")
+    @Column(updatable = false, nullable = false)
+    private UUID id;
+
+    @ManyToOne
+    @JoinColumn(name = "qr_code_type_id", nullable = false)
+    private QRCodeType qrCodeType;
+
+    private String userId;
+    private String contents;
+
+    @Column(name = "created_at", insertable = false, updatable = false)
+    private String createdAt;
+}