Filtering test results by timestamp is incredibly slow

[rpbritton]

Sample: https://test-observer.canonical.com/#/test-results?families=charm&from_date=2025-10-15T04:00:00.000Z

Probably needs an index?

[syncronize-issues-to-jira]

Thank you for reporting your feedback to us!

The internal ticket has been created: https://warthogs.atlassian.net/browse/TO-211.

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