Florian Spreckelsen
--- a/include/caosdb/entity.h
+++ b/include/caosdb/entity.h
+   */
+  inline auto Append(const T &element) -> void {
+    auto *destination = this->wrapped->Add();
+    destination->Swap(element.wrapped);
+
+    // Clear the originally wrapped object and return it to the Arena
+    element.wrapped->Clear();
+
+    // set the pointer to the new object which is owned by the RepeatedPtrField
+    element.wrapped = destination;
+  }
+
+  /**
+   * Remove the element at the given index.
+   */
+  inline auto remove(int index) -> void {
--- a/src/ccaosdb.cpp
+++ b/src/ccaosdb.cpp
    }                                                                          \
  }

+/**
+ * Macro for entity getters
+ */
+#define CAOSDB_ENTITY_GET(element, body_part)                                  \