As debug logs of harvests in the past can build up, they can take up significant space. Although they are not indexed and should not affect performance by themselves, they can definitely push against the database allocation.
This consideration is especially important on daily harvesting of large databases, file systems and BI servers.
MetaKarta provides a tool to manage and eliminate these older logs. There is a script operation named Delete operation logs. When run, it removes logs older than a certain number of days and allows filters for failed vs. successful logs.
As Delete operation logs is an operation, you may define a schedule for it and that way it will clean up the older unused logs of models periodically and automatically.