Looks like it adds about 50% of the storage for resource_params. That sounds scary, but remember that resource_params is deduplicated, only containing the unique resources across the entire population (which is typically a pretty small number, maybe in the 10s of thousands at the top end).

Plus, as the "parameters" column is the json-serialized representation of the parameters, if it goes over 2k of data it's automatically compressed by postgres and shrinks considerably.