Timestamp normalization - time can be parsed incorrectly if formatted as an `int`

[mikeldking]

Cases where we hit problems:

Time is stored as milliseconds and we (currently) parse it as seconds. This is not clear (no documentation)

Proposed solutions

Solution 1

Sample a few rows and determine if the units are ms or seconds

pseudo-code

if  1970EpochMs < timestamp < 1970EpochS
    units = "ms"
else
    units = "s"