feat: cleanup mechanism for conversation history

[tanweersalah]

Description

Changes proposed in this pull request:

• Added TTL for each data point

Related issue(s)

#283

[github-actions]

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Note(s) for PR Reviewer(s):

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[muralov]

good job, it looks good.

Can you please add integration tests? You can use fakeredis for that.
You can just assert in the test if a key is deleted after certain seconds, by faking REDIS_TTL