diff --git a/services/backup/src/DatabaseManager.h b/services/backup/src/DatabaseManager.h
--- a/services/backup/src/DatabaseManager.h
+++ b/services/backup/src/DatabaseManager.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "DatabaseEntitiesTools.h"
+#include "DatabaseManagerBase.h"
 #include "DynamoDBTools.h"
 
 #include <aws/core/Aws.h>
@@ -16,16 +17,7 @@
 namespace database {
 
 // this class should be thread-safe in case any shared resources appear
-class DatabaseManager {
-  void innerPutItem(
-      std::shared_ptr<Item> item,
-      const Aws::DynamoDB::Model::PutItemRequest &request);
-
-  template <typename T>
-  std::shared_ptr<T>
-  innerFindItem(Aws::DynamoDB::Model::GetItemRequest &request);
-  void innerRemoveItem(const Item &item);
-
+class DatabaseManager : public DatabaseManagerBase {
 public:
   static DatabaseManager &getInstance();
 
@@ -41,24 +33,6 @@
   void removeLogItem(std::shared_ptr<LogItem> item);
 };
 
-template <typename T>
-std::shared_ptr<T>
-DatabaseManager::innerFindItem(Aws::DynamoDB::Model::GetItemRequest &request) {
-  std::shared_ptr<T> item = createItemByType<T>();
-  request.SetTableName(item->getTableName());
-  const Aws::DynamoDB::Model::GetItemOutcome &outcome =
-      getDynamoDBClient()->GetItem(request);
-  if (!outcome.IsSuccess()) {
-    throw std::runtime_error(outcome.GetError().GetMessage());
-  }
-  const AttributeValues &outcomeItem = outcome.GetResult().GetItem();
-  if (!outcomeItem.size()) {
-    return nullptr;
-  }
-  item->assignItemFromDatabase(outcomeItem);
-  return item;
-}
-
 } // namespace database
 } // namespace network
 } // namespace comm
diff --git a/services/backup/src/DatabaseManager.cpp b/services/backup/src/DatabaseManager.cpp
--- a/services/backup/src/DatabaseManager.cpp
+++ b/services/backup/src/DatabaseManager.cpp
@@ -19,37 +19,6 @@
   return instance;
 }
 
-void DatabaseManager::innerPutItem(
-    std::shared_ptr<Item> item,
-    const Aws::DynamoDB::Model::PutItemRequest &request) {
-  const Aws::DynamoDB::Model::PutItemOutcome outcome =
-      getDynamoDBClient()->PutItem(request);
-  if (!outcome.IsSuccess()) {
-    throw std::runtime_error(outcome.GetError().GetMessage());
-  }
-}
-
-void DatabaseManager::innerRemoveItem(const Item &item) {
-  Aws::DynamoDB::Model::DeleteItemRequest request;
-  request.SetTableName(item.getTableName());
-  PrimaryKey pk = item.getPrimaryKey();
-  PrimaryKeyValue primaryKeyValue = item.getPrimaryKeyValue();
-  request.AddKey(
-      pk.partitionKey,
-      Aws::DynamoDB::Model::AttributeValue(primaryKeyValue.partitionKey));
-  if (pk.sortKey != nullptr && primaryKeyValue.sortKey != nullptr) {
-    request.AddKey(
-        *pk.sortKey,
-        Aws::DynamoDB::Model::AttributeValue(*primaryKeyValue.sortKey));
-  }
-
-  const Aws::DynamoDB::Model::DeleteItemOutcome &outcome =
-      getDynamoDBClient()->DeleteItem(request);
-  if (!outcome.IsSuccess()) {
-    throw std::runtime_error(outcome.GetError().GetMessage());
-  }
-}
-
 void DatabaseManager::putBackupItem(const BackupItem &item) {
   Aws::DynamoDB::Model::PutItemRequest request;
   request.SetTableName(BackupItem::tableName);
diff --git a/services/blob/src/DatabaseManager.h b/services/blob/src/DatabaseManager.h
--- a/services/blob/src/DatabaseManager.h
+++ b/services/blob/src/DatabaseManager.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "DatabaseEntitiesTools.h"
+#include "DatabaseManagerBase.h"
 #include "DynamoDBTools.h"
 
 #include <aws/core/Aws.h>
@@ -19,17 +20,7 @@
 namespace database {
 
 // this class should be thread-safe in case any shared resources appear
-class DatabaseManager {
-
-  void innerPutItem(
-      std::shared_ptr<Item> item,
-      const Aws::DynamoDB::Model::PutItemRequest &request);
-
-  template <typename T>
-  std::shared_ptr<T>
-  innerFindItem(Aws::DynamoDB::Model::GetItemRequest &request);
-  void innerRemoveItem(const Item &item);
-
+class DatabaseManager : public DatabaseManagerBase {
 public:
   static DatabaseManager &getInstance();
 
@@ -45,24 +36,6 @@
   bool removeReverseIndexItem(const std::string &holder);
 };
 
-template <typename T>
-std::shared_ptr<T>
-DatabaseManager::innerFindItem(Aws::DynamoDB::Model::GetItemRequest &request) {
-  std::shared_ptr<T> item = createItemByType<T>();
-  request.SetTableName(item->getTableName());
-  const Aws::DynamoDB::Model::GetItemOutcome &outcome =
-      getDynamoDBClient()->GetItem(request);
-  if (!outcome.IsSuccess()) {
-    throw std::runtime_error(outcome.GetError().GetMessage());
-  }
-  const AttributeValues &outcomeItem = outcome.GetResult().GetItem();
-  if (!outcomeItem.size()) {
-    return nullptr;
-  }
-  item->assignItemFromDatabase(outcomeItem);
-  return std::move(item);
-}
-
 } // namespace database
 } // namespace network
 } // namespace comm
diff --git a/services/blob/src/DatabaseManager.cpp b/services/blob/src/DatabaseManager.cpp
--- a/services/blob/src/DatabaseManager.cpp
+++ b/services/blob/src/DatabaseManager.cpp
@@ -18,37 +18,6 @@
   return instance;
 }
 
-void DatabaseManager::innerPutItem(
-    std::shared_ptr<Item> item,
-    const Aws::DynamoDB::Model::PutItemRequest &request) {
-  const Aws::DynamoDB::Model::PutItemOutcome outcome =
-      getDynamoDBClient()->PutItem(request);
-  if (!outcome.IsSuccess()) {
-    throw std::runtime_error(outcome.GetError().GetMessage());
-  }
-}
-
-void DatabaseManager::innerRemoveItem(const Item &item) {
-  Aws::DynamoDB::Model::DeleteItemRequest request;
-  request.SetTableName(item.getTableName());
-  PrimaryKey pk = item.getPrimaryKey();
-  PrimaryKeyValue primaryKeyValue = item.getPrimaryKeyValue();
-  request.AddKey(
-      pk.partitionKey,
-      Aws::DynamoDB::Model::AttributeValue(primaryKeyValue.partitionKey));
-  if (pk.sortKey != nullptr && primaryKeyValue.sortKey != nullptr) {
-    request.AddKey(
-        *pk.sortKey,
-        Aws::DynamoDB::Model::AttributeValue(*primaryKeyValue.sortKey));
-  }
-
-  const Aws::DynamoDB::Model::DeleteItemOutcome &outcome =
-      getDynamoDBClient()->DeleteItem(request);
-  if (!outcome.IsSuccess()) {
-    throw std::runtime_error(outcome.GetError().GetMessage());
-  }
-}
-
 void DatabaseManager::putBlobItem(const BlobItem &item) {
   Aws::DynamoDB::Model::PutItemRequest request;
   request.SetTableName(BlobItem::tableName);
diff --git a/services/backup/src/DatabaseManager.h b/services/lib/lib_src/DatabaseManagerBase.h
copy from services/backup/src/DatabaseManager.h
copy to services/lib/lib_src/DatabaseManagerBase.h
--- a/services/backup/src/DatabaseManager.h
+++ b/services/lib/lib_src/DatabaseManagerBase.h
@@ -4,19 +4,18 @@
 #include "DynamoDBTools.h"
 
 #include <aws/core/Aws.h>
-#include <aws/dynamodb/model/AttributeDefinition.h>
 #include <aws/dynamodb/model/GetItemRequest.h>
 #include <aws/dynamodb/model/PutItemRequest.h>
 
 #include <memory>
-#include <string>
 
 namespace comm {
 namespace network {
 namespace database {
 
 // this class should be thread-safe in case any shared resources appear
-class DatabaseManager {
+class DatabaseManagerBase {
+protected:
   void innerPutItem(
       std::shared_ptr<Item> item,
       const Aws::DynamoDB::Model::PutItemRequest &request);
@@ -24,26 +23,13 @@
   template <typename T>
   std::shared_ptr<T>
   innerFindItem(Aws::DynamoDB::Model::GetItemRequest &request);
-  void innerRemoveItem(const Item &item);
-
-public:
-  static DatabaseManager &getInstance();
 
-  void putBackupItem(const BackupItem &item);
-  std::shared_ptr<BackupItem>
-  findBackupItem(const std::string &userID, const std::string &backupID);
-  std::shared_ptr<BackupItem> findLastBackupItem(const std::string &userID);
-  void removeBackupItem(std::shared_ptr<BackupItem> item);
-
-  void putLogItem(const LogItem &item);
-  std::vector<std::shared_ptr<LogItem>>
-  findLogItemsForBackup(const std::string &backupID);
-  void removeLogItem(std::shared_ptr<LogItem> item);
+  void innerRemoveItem(const Item &item);
 };
 
 template <typename T>
-std::shared_ptr<T>
-DatabaseManager::innerFindItem(Aws::DynamoDB::Model::GetItemRequest &request) {
+std::shared_ptr<T> DatabaseManagerBase::innerFindItem(
+    Aws::DynamoDB::Model::GetItemRequest &request) {
   std::shared_ptr<T> item = createItemByType<T>();
   request.SetTableName(item->getTableName());
   const Aws::DynamoDB::Model::GetItemOutcome &outcome =
@@ -56,7 +42,7 @@
     return nullptr;
   }
   item->assignItemFromDatabase(outcomeItem);
-  return item;
+  return std::move(item);
 }
 
 } // namespace database
diff --git a/services/lib/lib_src/DatabaseManagerBase.cpp b/services/lib/lib_src/DatabaseManagerBase.cpp
new file mode 100644
--- /dev/null
+++ b/services/lib/lib_src/DatabaseManagerBase.cpp
@@ -0,0 +1,45 @@
+#include "DatabaseManagerBase.h"
+
+#include <aws/core/utils/Outcome.h>
+#include <aws/dynamodb/model/DeleteItemRequest.h>
+
+#include <iostream>
+
+namespace comm {
+namespace network {
+namespace database {
+
+void DatabaseManagerBase::innerPutItem(
+    std::shared_ptr<Item> item,
+    const Aws::DynamoDB::Model::PutItemRequest &request) {
+  const Aws::DynamoDB::Model::PutItemOutcome outcome =
+      getDynamoDBClient()->PutItem(request);
+  if (!outcome.IsSuccess()) {
+    throw std::runtime_error(outcome.GetError().GetMessage());
+  }
+}
+
+void DatabaseManagerBase::innerRemoveItem(const Item &item) {
+  Aws::DynamoDB::Model::DeleteItemRequest request;
+  request.SetTableName(item.getTableName());
+  PrimaryKey pk = item.getPrimaryKey();
+  PrimaryKeyValue primaryKeyValue = item.getPrimaryKeyValue();
+  request.AddKey(
+      pk.partitionKey,
+      Aws::DynamoDB::Model::AttributeValue(primaryKeyValue.partitionKey));
+  if (pk.sortKey != nullptr && primaryKeyValue.sortKey != nullptr) {
+    request.AddKey(
+        *pk.sortKey,
+        Aws::DynamoDB::Model::AttributeValue(*primaryKeyValue.sortKey));
+  }
+
+  const Aws::DynamoDB::Model::DeleteItemOutcome &outcome =
+      getDynamoDBClient()->DeleteItem(request);
+  if (!outcome.IsSuccess()) {
+    throw std::runtime_error(outcome.GetError().GetMessage());
+  }
+}
+
+} // namespace database
+} // namespace network
+} // namespace comm