Automatic deletion mechanism is broken

[Kogerro]

Automatic deletion mechanism of old logs is broken. It is based on incorrect assumption, that each log line should start with a time stamp like 2017-10-05T14:46:36.541Z, and chooses logs to delete by simple string comparison of whole log line and string made from date before which logs should be deleted.

This causes two major problems:

• if there's no such time stamp, old logs won't be ever automatically deleted
• logs starting with strings "lower" than string made from date before which logs should be deleted are automatically deleted.

It took me a long search to find why all my logs starting with custom date "dd/mm" are removed between Hyperlog initializations - it was simply because it made log lines start with '0', while string made from date before which logs should be deleted always started with '2'.