This is how Javescript's Date() handles ISO8601 strings with sub
millisecond accuracy, which seems to be how the datapack's were named as
it appears that the filenames of datapacks with more than 3 decimal
places of fractional time have their milliseconds truncated down to the
nearest whole millisecond.

Qt by default will round to the nearest, either up or down, which meant
that datapacks with add dates with >= xxx.5 of a millisecond fraction
would not have the correct filename determined for them when reading the
value from the DB.

Ignore datapack dateAdded fractional accuracy past 3 decimal places