[feat] 보고싶어요 엔티티, repository 추가

src/main/java/com/mookive/mookive_backend/heart/domain/entity/Heart.java

@@ -0,0 +1,32 @@
+package com.mookive.mookive_backend.heart.domain.entity;
+
+import com.mookive.mookive_backend.movie.domain.entity.Movie;
+import com.mookive.mookive_backend.user.domain.entity.User;
+import jakarta.persistence.*;
+import lombok.AccessLevel;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class Heart {
+
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @ManyToOne
+    @JoinColumn(name = "movie_id")
+    private Movie movie;
+
+    @ManyToOne
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    @Builder
+    public Heart(Movie movie, User user) {
+        this.movie = movie;
+        this.user = user;
+    }
+}

src/main/java/com/mookive/mookive_backend/heart/domain/repository/HeartRepository.java

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+package com.mookive.mookive_backend.heart.domain.repository;
+
+import com.mookive.mookive_backend.heart.domain.entity.Heart;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface HeartRepository extends JpaRepository<Heart, Long> {
+
+    void deleteByUserIdAndMovieId(Long userId, Long movieId);
+
+    boolean existsByUserIdAndMovieId(Long userId, Long movieId);
+}