I accidentally enabled all importer parameters. In this way, a lot of useless data has been saved to DB which increases the statistics and visits too much. Is there a way to clean up the DB leaving only the useful data?
Parameter used are: --recorders=4 --enable-http-errors --enable-http-redirects --enable-static --enable-bots
Hi @Eternity6
You can use the 
> Privacy > GDPR Tools tool.
Don’t forget, after the data cleaning, to invalidate past historical reports:
To clean trash data in Matomo, you need to remove unnecessary logs, old visits, and unused reports to keep analytics accurate and improve performance. Here’s a simple step-by-step guide:
Go to Administration
Click Privacy → Anonymize Data
Enable Delete old visitor logs
Set retention period (e.g., 90 days or 180 days)
Save changes
This automatically removes outdated data from your database.
Navigate to Administration → System → General Settings
Enable Delete old reports
Choose how long to keep aggregated reports
Save and apply
This helps remove unnecessary historical summaries.
Go to Administration → Websites → Bot Filtering
Enable Exclude known bots
Add spam referrers in Referrer Spam Blacklist
Save changes
This prevents future junk data from being stored.
If you manage your server:
./console core:purge-old-archive-data
This clears archived data that is no longer needed.
Go to Administration → Websites
Delete test or duplicate tracking sites
This removes irrelevant data sources
Go to Administration → System → General Settings
Click Invalidate Reports
Matomo will regenerate clean data
As suggested you can remove the raw data logs, but keep in mind you won’t be able to archive these date ranges again or create custom reports using historical data.