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Close the remaining security gaps in apps, the dev server and the platform #2002

Job	Run time
test (ubuntu-latest, 1/2)	1m 43s
test (ubuntu-latest, 2/2)	1m 37s
build and typecheck (ubuntu-latest)	1m 20s
test (ubuntu-latest, unit)	2m 1s
live-e2e	-1s
done	4s
	6m 44s