diff --git a/source/src/main/java/one/nem/lacerta/source/database/dao/ToxiDocumentTagDao.java b/source/src/main/java/one/nem/lacerta/source/database/dao/ToxiDocumentTagDao.java
index 334bd092..ae1c44b3 100644
--- a/source/src/main/java/one/nem/lacerta/source/database/dao/ToxiDocumentTagDao.java
+++ b/source/src/main/java/one/nem/lacerta/source/database/dao/ToxiDocumentTagDao.java
@@ -10,4 +10,28 @@ import one.nem.lacerta.source.database.entity.ToxiDocumentTagEntity;
 
 @Dao
 public interface ToxiDocumentTagDao {
+
+    @Query("SELECT * FROM toxi_document_tag WHERE document_id = :documentId")
+    List<ToxiDocumentTagEntity> findByDocumentId(String documentId);
+
+    @Query("SELECT * FROM toxi_document_tag WHERE tag_id = :tagId")
+    List<ToxiDocumentTagEntity> findByTagId(String tagId);
+
+    @Insert
+    void insert(ToxiDocumentTagEntity toxiDocumentTag);
+
+    @Insert
+    void insertAll(ToxiDocumentTagEntity... toxiDocumentTags);
+
+    @Insert
+    void insertAll(List<ToxiDocumentTagEntity> toxiDocumentTags);
+
+    @Query("DELETE FROM toxi_document_tag WHERE document_id = :documentId")
+    void deleteByDocumentId(String documentId);
+
+    @Query("DELETE FROM toxi_document_tag WHERE tag_id = :tagId")
+    void deleteByTagId(String tagId);
+
+    @Query("DELETE FROM toxi_document_tag WHERE document_id = :documentId AND tag_id = :tagId")
+    void deleteByDocumentIdAndTagId(String documentId, String tagId);
 }