When you see the usage as expected. The fast check - just restart. If it would show the actual usage - you are good.
However, before that I would suggest to check, that your logs doesn’t contain errors related to a filewalker (search for walk|retain and error|failed case insensitive).
Because if you would have errors, the used space DB will not be updated unfortunately, see Disk usage discrepancy? and Debugging space usage discrepancies for more details
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