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HealthLog/src/lib/measurements
Marc-André Bombeck 12e5817c16 test(import): prove bounded heap on a large synthetic export archive
Generate a 700k-record export.xml (~200 MB decompressed, 500k
cumulative step records each carrying a fresh HKDevice runtime address,
200k interleaved spot rows) streamed into a temp stored-method ZIP —
never checked in, never held in memory whole — and push it through the
real extractExportXml + streamParseExportXml pipeline against a
discarding Prisma stand-in.

Live heap is measured after forced collections at every progress tick;
the asserted growth bound (48 MiB) is a quarter of the decompressed
volume. Both historical failure modes blow past it: reverting the
device-address normalization retains ~61 MiB of fragmented source
buckets, and unbounding the batch buffers retains ~76 MiB and starves
the progress ticks. The fixed pipeline measures under 1 MiB of live
growth. The suite also pins semantics alongside memory: every record
read, every spot row flushed, and exactly one cumulative estimate row
per day rather than one per device address. Refs #775.
2026-08-13 06:16:44 +02:00
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