bugfix determination of the first backup to retain #31
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today = 2022-09-12. bd = 2. old code selects the last backup prior 2022-09-10. the selected backup is 2022-02-09 23:59:59 or older. the result is that the last backup prior 2022-09-10 will not be deleted. And this is wrong. Change the sql to select the first backup to retain. This results in correct deletion of all backups prio 2022-09-10.