I wish I could test on production withough comitting and pushing
Remove the scary JSON preview of data that users didn't like.
Remove deprecated filter_data method
Remove deprecated aggregate_data function
Remove JSON preview in another location.
Improved inferring return value types from O(N) to O(1)
Make front end consistent in key/attribute conditional/sign terminology.
Decompose helper for identifying datetime groupBy filter.
Fix some silly mistakes I couldn't test without internet.