diff --git a/source/src/main/java/one/nem/lacerta/source/database/dao/placeholder b/source/src/main/java/one/nem/lacerta/source/database/dao/placeholder
new file mode 100644
index 00000000..e69de29b
diff --git a/source/src/main/java/one/nem/lacerta/source/database/entity/placeholder b/source/src/main/java/one/nem/lacerta/source/database/entity/placeholder
new file mode 100644
index 00000000..e69de29b