diff --git a/common/storage.go b/common/storage.go
new file mode 100644
index 0000000..62a8a06
--- /dev/null
+++ b/common/storage.go
@@ -0,0 +1,13 @@
+package common
+
+import (
+	"git.defalsify.org/vise.git/db"
+)
+
+func StoreToDb(store *UserDataStore, prefix []byte) db.Db {
+	innerStore := store.Db
+	if pfx != nil {
+		innerStore = NewSubPrefixDb(innerStore, pfx)		
+	}
+	return innerStore
+}