Python tests

MRG: change `sig_from_record` to use scaled from `Record` to downsample #7463

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Run time

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Job	Run time
test (ubuntu-22.04, 3.12)	10m 22s
test (ubuntu-22.04, 3.11)	8m 31s
test (ubuntu-22.04, 3.10)	10m 53s
test (macos-latest, 3.12)	6m 29s
test (macos-latest, 3.11)	6m 18s
test (macos-latest, 3.10)	6m 42s
	49m 15s