Some embodiments include reception, from a first client system, of first instance data of a first data structure defined by the stored metadata, the first instance data associated with a first entity, storage of the first instance data of the first data structure in a data store, reception, from the first client system, of an indication associating the first instance data, a second client system, and second data not defined by the metadata, storage of the indication in the data store, reception, from the first client system, of information for retrieving the second data from the first client system and for generating a visualization based on the second data, reception of a request for data associated with the first entity from a second client system, and, in response to the request, identification of the stored indication associating the first instance data, the second client system, and the second data, retrieval of the second data from the first client system based on the information, generation of the visualization of the second data based on the information, and transmission of a visualization of the stored first instance data and the visualization of the second data to the second client system.