In principle we could support very large numbers of Assets per DataSource, but in practice at the moment ?include_data_sources=true lists the Assets in one list, not paginated. If we find use cases for very large number of Assets, we'll want a paginated way to list, and perhaps filter and sort them.

For now, should we limit Assets to 10k per DataSource? I think the most likely reason for us to breach that limit would be TIFF sequences, so @Wiebke and @dylanmcreynolds should weigh in on whether this limit will be a problem for present use cases at ALS.