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Automatically overwrite PostgreSQL logfile once reached 7 days.

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To keep 7 days of logs, one log file per day named postgresql-Mon.log, postgresql-Tue.log, etc, and automatically overwrite last week’s log with this week’s log.

 logging_collector=on log_filename = 'postgresql-%a.log' log_directory = 'log' log_rotation_age = 1d log_truncate_on_rotation=on

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