pg_timeout_millis rounded `us` values with `(value + 500) / 1_000`, which
overflows for the top 500 representable u128 magnitudes — a debug panic during
config load, or in release a wrapped near-zero millisecond value that slips
past the range check and hands the original gigantic string to every pool's
after_connect. Round without the intermediate, and cover u128::MAX and the
first overflowing value in the fallback test.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Signed-off-by: Eli Foster <efoster@squareup.com>
d76acde5fe