diff --git a/data/src/main/java/one/nem/lacerta/source/db/RoomUtils.java b/data/src/main/java/one/nem/lacerta/source/db/RoomUtils.java
new file mode 100644
index 00000000..8410faf3
--- /dev/null
+++ b/data/src/main/java/one/nem/lacerta/source/db/RoomUtils.java
@@ -0,0 +1,7 @@
+package one.nem.lacerta.source.db;
+
+public class RoomUtils {
+
+
+
+}
diff --git a/data/src/main/java/one/nem/lacerta/source/db/entity/Documents.java b/data/src/main/java/one/nem/lacerta/source/db/entity/Documents.java
new file mode 100644
index 00000000..f47fbf94
--- /dev/null
+++ b/data/src/main/java/one/nem/lacerta/source/db/entity/Documents.java
@@ -0,0 +1,4 @@
+package one.nem.lacerta.source.db.entity;
+
+public class Documents {
+}