[EA3-78] feat : StudyPost 엔티티 생성

Author: endorsement0912

src/main/java/grep/neogul_coder/domain/studypost/StudyPost.java

@@ -0,0 +1,45 @@
+package grep.neogul_coder.domain.studypost;
+
+import grep.neogul_coder.domain.study.Study;
+import grep.neogul_coder.global.entity.BaseEntity;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.EnumType;
+import jakarta.persistence.Enumerated;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.validation.constraints.NotBlank;
+
+@Entity
+public class StudyPost extends BaseEntity {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  private Long id;
+
+  @ManyToOne(fetch = FetchType.LAZY, optional = false)
+  @JoinColumn(name = "study_id", nullable = false)
+  private Study study;
+
+  @Column(nullable = false)
+  private Long userId;
+
+  @NotBlank(message = "제목은 필수입니다.")
+  @Column(nullable = false)
+  private String title;
+
+  @Enumerated(EnumType.STRING)
+  @Column(nullable = false)
+  private Category category;
+
+  @NotBlank(message = "내용은 필수입니다.")
+  @Column(nullable = false)
+  private String content;
+
+  @Column(nullable = false)
+  private boolean isDeleted = false;
+}