Start equals End (equality mode)
If StartUtc and EndUtc are exactly the same timestamp, the filter is treated as an equality check for that precise moment in time:
CreatedUtc == StartUtc
This does not represent an interval; only records with CreatedUtc equal to that exact instant are returned.
Start differs from End (interval mode)
If StartUtc and EndUtc are different, the filter is evaluated as a half-open interval:
StartUtc <= CreatedUtc < EndUtc
In other words, the start is inclusive and the end is exclusive.