Re: patch to fix retention in pg_backup_rotated.sh

Hello

My patch should use 28 days instead of 31 for the month length:
+EXPIRED_DAYS=`expr $((($MONTHS_TO_KEEP * 28) - 1))`

The script should then correctly keep $MONTHS_TO_KEEP monthly backups, with
0 <= $MONTHS_TO_KEEP <= 12 .

Best regards
Francois Scheurer

PS: the monthly backup of February of bissextile year will be wrongly
deleted if $MONTHS_TO_KEEP = 12 and if it is the oldest backup. I think it
is not a big issue as long as 11 backups remains. Solving this issue will
require the script to be re-written differently.

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