reproducible: move (nearly) all timestamps from strings to real timestamps data types

        "UPDATE schedule SET build_type='ci_build'",

        "ALTER TABLE schedule ALTER COLUMN build_type SET NOT NULL",

    ],

    47: [  # turn timestamps into real timestamps

        "ALTER TABLE {0} ALTER COLUMN {1} TYPE timestamp without time zone "

        "USING to_timestamp({1}, 'YYYY-MM-DD HH24:MI:SS')".format(i, j) for i, j in (

            ("results", "build_date"),

            ("schedule", "date_scheduled"),

        )] + [

        "ALTER TABLE {0} ALTER COLUMN datum TYPE date "

        "USING to_date(datum, 'YYYY-MM-DD')".format(i) for i in (

            "stats_breakages", "stats_bugs", "stats_builds_age",

            "stats_builds_per_day", "stats_issues", "stats_meta_pkg_state",

            "stats_notes", "stats_pkg_state",

        )

    ],

}