WIP: cleanup after test_transaction

test/test_transaction.cpp

@@ -41,7 +41,18 @@ protected:
   void SetUp() override {}
 
   void TearDown() override {
-    // TODO(tf): delete all created entities
+    const auto &connection =
+      caosdb::connection::ConnectionManager::GetDefaultConnection();
+    auto query_transaction(connection->CreateTransaction());
+    query_transaction->Query("FIND ENTITY WITH id > 99");
+    query_transaction->Execute();
+    if (query_transaction->GetResultSet().Size() > 0) {
+      for (const Entity &entity : query_transaction->GetResultSet()) {
+        auto delete_transaction(connection->CreateTransaction());
+        delete_transaction->DeleteById(entity.GetId());
+        delete_transaction->Execute();
+      }
+    }
   }
 };