Hardening B/2 (stacked on #290): doc cache correctness, 429 instead of 500, health check, CI runs tests again - #291

Hardening B/2 (stacked on #290): doc cache correctness, 429 instead of 500, health check, CI runs tests again#291

gregv merged 5 commits into

developopportunity-hack/backend-ohack.dev:developfrom

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