[FEAT] 문서 참조 영속 모델과 Repository 기능 구현

src/main/java/com/wooteco/wiki/graph/domain/DocumentReference.java

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+package com.wooteco.wiki.graph.domain;
+
+import com.wooteco.wiki.document.domain.CrewDocument;
+import com.wooteco.wiki.document.domain.Document;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.ForeignKey;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Index;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import jakarta.persistence.UniqueConstraint;
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Entity
+@Table(
+        name = "document_reference",
+        uniqueConstraints = @UniqueConstraint(
+                name = "uk_document_reference_source_target",
+                columnNames = {"source_document_id", "target_document_id"}
+        ),
+        indexes = {
+                @Index(name = "idx_document_reference_source", columnList = "source_document_id"),
+                @Index(name = "idx_document_reference_target", columnList = "target_document_id")
+        }
+)
+public class DocumentReference {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @ManyToOne(fetch = FetchType.LAZY, optional = false)
+    @JoinColumn(
+            name = "source_document_id",
+            nullable = false,
+            foreignKey = @ForeignKey(name = "fk_document_reference_source")
+    )
+    private CrewDocument sourceDocument;
+
+    @ManyToOne(fetch = FetchType.LAZY, optional = false)
+    @JoinColumn(
+            name = "target_document_id",
+            nullable = false,
+            foreignKey = @ForeignKey(name = "fk_document_reference_target")
+    )
+    private Document targetDocument;
+
+    public static DocumentReference of(
+            CrewDocument sourceDocument,
+            Document targetDocument
+    ) {
+        return new DocumentReference(sourceDocument, targetDocument);
+    }
+
+    private DocumentReference(
+            CrewDocument sourceDocument,
+            Document targetDocument
+    ) {
+        this.sourceDocument = sourceDocument;
+        this.targetDocument = targetDocument;
+    }
+
+    public CrewDocument getSourceDocument() {
+        return sourceDocument;
+    }
+
+    public Document getTargetDocument() {
+        return targetDocument;
+    }
+}

src/main/java/com/wooteco/wiki/graph/repository/DocumentReferenceRepository.java

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+package com.wooteco.wiki.graph.repository;
+
+import com.wooteco.wiki.document.domain.CrewDocument;
+import com.wooteco.wiki.document.domain.Document;
+import com.wooteco.wiki.graph.domain.DocumentReference;
+import java.util.List;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface DocumentReferenceRepository extends JpaRepository<DocumentReference, Long> {
+
+    List<DocumentReference> findAllBySourceDocument(CrewDocument sourceDocument);
+
+    void deleteAllBySourceDocument(CrewDocument sourceDocument);
+
+    void deleteAllByTargetDocument(Document targetDocument);
+}

src/test/java/com/wooteco/wiki/graph/fixture/DocumentReferenceFixture.java

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+package com.wooteco.wiki.graph.fixture;
+
+import com.wooteco.wiki.document.domain.CrewDocument;
+import com.wooteco.wiki.document.domain.Document;
+import com.wooteco.wiki.graph.domain.DocumentReference;
+
+public final class DocumentReferenceFixture {
+
+    public static DocumentReference create(
+            CrewDocument sourceDocument,
+            Document targetDocument
+    ) {
+        return DocumentReference.of(sourceDocument, targetDocument);
+    }
+
+    private DocumentReferenceFixture() {
+    }
+}