[bug] Duplicate entries in baseline cog table

[danswick]

While researching some issues with Cognizant / Oversight assignment, @gsa-suk discovered that a lot of historical Census records are duplicated in the baseline table. Some appear to be "real" and others possibly the result of some internal testing that got overlooked. For example:

report_ID	source	date_added
001	Census	2023-10-11
002	CENSUS	2021-03-04

In the example above, it appears that all entries with source=Census (initial cap) have the same date of 2023-10-11, suggesting they were all created or at least updated at the same time as part of some batch operation. Entries with source=CENSUS (all cap) appear to have unique dates.

As far as we can tell, this doesn't impact functionality, but it is confusing and could cause problems in the future if the cog assignment and calculation logic changes.