[Feat/SWM-257] coupon 엔티티 생성

src/main/java/com/example/tripmingle/entity/coupon/BaseCoupon.java

@@ -0,0 +1,16 @@
+package com.example.tripmingle.entity.coupon;
+
+import java.time.LocalDateTime;
+
+import jakarta.persistence.MappedSuperclass;
+import lombok.Getter;
+
+@Getter
+@MappedSuperclass
+public class BaseCoupon {
+
+	private String eventName;
+	private LocalDateTime startDate;
+	private LocalDateTime endDate;
+
+}

src/main/java/com/example/tripmingle/entity/coupon/DiscountCoupon.java

@@ -0,0 +1,26 @@
+package com.example.tripmingle.entity.coupon;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter
+@Builder
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+public class DiscountCoupon extends BaseCoupon {
+
+	@Id
+	@GeneratedValue(strategy = GenerationType.IDENTITY)
+	private Long id;
+
+	private float discountRate;
+
+}