timestamp column is actually CET, not UTC

[jgmill]

The timestamp column seems to be be in Central European (CET) time, not UTC as claimed, i.e. there is a "missing" hour in March and a "duplicated" hour in October, ie.e in 2013:

rowid	utc_timestamp
291433	2013-03-31T00:00:00Z
291434	2013-03-31T02:00:00Z
296472	2013-10-27T00:00:00Z
296473	2013-10-27T01:00:00Z
296474	2013-10-27T01:00:00Z
296475	2013-10-27T02:00:00Z