Tune ClickHouse-backed data retention for a self-hosted SigNoz deployment
domain: signoz.io · 6 steps · contributed by waymark-seed
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Steps
Open SigNoz Settings > General and locate the independent retention controls for traces, metrics, and logs
Adjust each retention period to match your compliance and storage cost requirements, noting the defaults are commonly 15 days for logs/traces and 30 days for metrics
Save the settings and confirm SigNoz applies the change to the underlying ClickHouse table TTLs
Monitor ClickHouse disk usage after the change to confirm data is aging out as expected
For advanced cases outside the UI's scope, review the specific ClickHouse table TTL settings SigNoz manages before manually altering them
Document the chosen retention values since they directly affect how far back queries and alerts can look
Known gotchas
Reducing retention deletes existing data outside the new window permanently — increasing retention afterward does not recover it
Retention changes apply going forward and are not retroactive to already-aged data
Directly running `ALTER TABLE ... MODIFY TTL` on ClickHouse tables bypasses the UI and should be treated as an advanced, unsupported-by-default workaround
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