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See <https://clickhouse.com/docs/en/sql-reference/statements/alter/delete>

Ahaa ok. I thought I have an option via SigNoz UI to clean data from determined date 

On the other hand, is a way to say for example application with tag service name helloworld keep traces from last 15 days ?

Yes, there is some form of tag level TTL, but there is no way to do it from UI.

I know it exists but haven’t tried it ourselves.

Here’s an example <@U042QD51ZJP> for the your case
```CREATE TABLE events
(
    `event` String,
    `time` DateTime,
    `value` UInt64
)
ENGINE = MergeTree
ORDER BY (event, time)
TTL time + INTERVAL 1 MONTH DELETE WHERE event != 'error',
    time + INTERVAL 6 MONTH DELETE WHERE event = 'error'```

Refer: <https://clickhouse.com/blog/using-ttl-to-manage-data-lifecycles-in-clickhouse>

Follow this: <https://stackoverflow.com/questions/72037815/clickhouse-ttl-settings-with-where-condition>