Aggregate to check for duplicates

[leppott]

Is your feature request related to a problem? Please describe.
Users sometimes have files with overlapping time periods. Current version of Aggregate simply appends files resulting in duplicates.

Describe the solution you'd like
Not sure see alternatives.

Describe alternatives you've considered

1. Alert users so can modify input data. Maybe stop if datetimes overlap an give info in stop message.
2. Use Unique to get rid of duplicates. But only if exact. If any differences then still have dup records. Would still need a check.

Additional context
Users should have data stored only in one file but many users have the same date range in multiple files. Current "append" leads to extra time figuring out what went wrong and which data to retain.