64bit integers with counter_agg

[Xeitor]

Hi there, I am investigating on what is the best way to work with a couple of measurements of ever-increasing 64 bit counters from some networking devices sampled via SNMP. I was looking into the counter_agg function but I am not sure if It will work correctly for my use case, since the signature is:

counter_agg(ts TIMESTAMPTZ,value DOUBLE PRECISION[, bounds TSTZRANGE]) RETURNS CounterSummary
and since the counter are 64bits I need a numeric unsigned column that supports all possible counter values.

from the docs:

timescaledb-toolkit/docs/counter_agg.md

Line 163 in 69278f1

##### ¹ Note that the `value` is currently only accepted as a `DOUBLE PRECISION` number as most people use that for counters, even though other numeric types (ie `BIGINT`) might sometimes be more intuitive. If you store a value as a different numeric type you can cast to `DOUBLE PRECISION` on input to the function.

I says that I may cast to double precision, but if I did, wouldn't it be possible to loose precision if the counters get large enough?