healthchecks / healthchecks / 20455481604

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Fix prepare_durations to assert ping ordering by id not by created date

When multiple clients are inserting pings in the api_ping table
simultaneously, it is rare but possible to have a ping with a higher
id value but lower created timestamp than another ping.

As a consequence, when retrieving pings from the database, if we
retrieve them ordered by ids, and then in the python code check if
they are ordered by the created timestamp, the check will sometimes
fail.

This commit fixes prepare_durations() to check the sorting order by
ids, since the pings were retrieved from the database sorted
by ids.

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