Allow users to annotate dataflow refresh history
This would be particularly helpful when dataflow authors are in the process of making/debugging dataflows, since they're likely to have a smattering of failed/canceled refreshes. It's not easy to keep track of *why* they failed (e.g. "this refresh broke because of a poorly-constructed merge")
Add an option to cancel Datamart refresh
In their current state, Datamarts present no option to cancel a refresh. Without this, Datamart builders will become risk-averse, fearing to make query changes, lest their next refresh take days to finish.
include filters in aggregation management
The 'Manage aggregations' feature is great for creating a hidden, locally-imported pre-aggregated table to speed interactions with giant, remote detail tables.
However, filters that users are likely to need could benefit from the same kind of optimization.