diff --git a/tddb/td/db/BinlogKeyValue.h b/tddb/td/db/BinlogKeyValue.h
index 034db47b8..735e120d0 100644
--- a/tddb/td/db/BinlogKeyValue.h
+++ b/tddb/td/db/BinlogKeyValue.h
@@ -220,6 +220,13 @@ class BinlogKeyValue final : public KeyValueSyncInterface {
     binlog_->lazy_sync(std::move(promise));
   }
 
+  void for_each(std::function<void(Slice, Slice)> func) final {
+    auto lock = rw_mutex_.lock_write().move_as_ok();
+    for (const auto &kv : map_) {
+      func(kv.first, kv.second.first);
+    }
+  }
+
   std::unordered_map<string, string, Hash<string>> prefix_get(Slice prefix) final {
     auto lock = rw_mutex_.lock_write().move_as_ok();
     std::unordered_map<string, string, Hash<string>> res;
diff --git a/tddb/td/db/KeyValueSyncInterface.h b/tddb/td/db/KeyValueSyncInterface.h
index d9e53cbf8..d4e43ffef 100644
--- a/tddb/td/db/KeyValueSyncInterface.h
+++ b/tddb/td/db/KeyValueSyncInterface.h
@@ -12,6 +12,7 @@
 #include "td/utils/Promise.h"
 #include "td/utils/Slice.h"
 
+#include <functional>
 #include <unordered_map>
 
 namespace td {
@@ -35,6 +36,8 @@ class KeyValueSyncInterface {
 
   virtual string get(const string &key) = 0;
 
+  virtual void for_each(std::function<void(Slice, Slice)> func) = 0;
+
   virtual std::unordered_map<string, string, Hash<string>> prefix_get(Slice prefix) = 0;
 
   virtual FlatHashMap<string, string> get_all() = 0;