Marc-André Bombeck ed96a8a5d1 test(rollups): assert regression parity relatively, not at absolute 9 dp ...

The DST-boundary parity case seeds two readings on the same UTC day, so the
windowed compose folds a closed form over a large epoch-day x (~20540). The
n*Sxx - Sx^2 denominator subtracts two ~1e10 magnitudes and loses about ten
significant digits to cancellation before the divide, so an absolute
toBeCloseTo at 9 dp is the wrong gauge for a slope that small. The populator
sums per-raw-reading accumulators grouped by day, so both paths regress over
the identical raw-row x set and agree mathematically; the residual is float
summation order alone. Switch all parity assertions to a shared relative
tolerance (1e-9 of scale), far tighter than the 2-3 dp the read tier rounds to.

2026-06-22 09:13:02 +02:00

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integration

test(rollups): assert regression parity relatively, not at absolute 9 dp

2026-06-22 09:13:02 +02:00