Add vote datetime to `vote` DB model

[tohuynh]

Feature Description

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Add vote datetime field to the vote DB model
https://github.com/CouncilDataProject/cdp-backend/blob/main/cdp_backend/database/models.py#L698

Use Case

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The front end wants to be able to sort a person's voting record by vote datetime.

Solution

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Alternatives

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[Shak2000]

I can look into it, but I need to understand something:Vote has a reference to Event, and Event has a datetime. Does this satisfy the requirement for having datetime accessible from Vote?

[tohuynh]

Vote has a reference to Event, and Event has a datetime. Does this satisfy the requirement for having datetime accessible from Vote?

It would, but the query to sort/filter a person's votes by the event's datetime would be inefficient, as the query would need to populate/fill in the Event for each Vote. Sorting/filtering votes by the event's datetime would force us to fetch all votes and populate the Event reference field for each vote(populating is just making a request to the database to fill in the reference field) and currently the database only allows a limited number of concurrent requests ( we have to make concurrent requests or the page will have high latency).

See the source of this issue.

[evamaxfield]

Agree with To's writeup. The Vote having a reference to Event is not enough. For faster querying and direct filtering we need the vote_datetime on the Vote model.