metadata for receiver

common/cpp/include/database/database.h

common/cpp/include/unittests/MockDatabase.h

common/cpp/src/database/mongodb_client.cpp

common/cpp/src/database/mongodb_client.h

producer/api/src/producer_impl.cpp

producer/api/unittests/test_request_handler_tcp.cpp

receiver/CMakeLists.txt

receiver/src/receiver_error.h

receiver/src/request.cpp

receiver/src/request.h

receiver/src/request_factory.cpp

receiver/src/request_factory.h

receiver/src/request_handler_db.cpp

receiver/src/request_handler_db.h

receiver/src/request_handler_db_meta_write.cpp

receiver/src/request_handler_db_meta_write.h

receiver/src/request_handler_db_write.cpp

receiver/src/request_handler_db_write.h

receiver/src/requests_dispatcher.h

receiver/unittests/test_request_factory.cpp