[Issue #3446] Create database table for saved searches

[mikehgrantsgov]

Summary

Fixes #3446

Time to review: 10 mins

Changes proposed

Add user saved search model
Add DB migration

Context for reviewers

This lays the groundwork for an API to save user searched.

Additional information

Generated table:

[chouinar]

FYI - when actually using this table, there might be some serialization issues as the default JSON serializer/deserializer probably won't handle things like python enums right.

We can adjust the serializer: https://github.com/HHS/simpler-grants-gov/blob/main/api/src/adapters/db/clients/postgres_client.py#L51 - however don't use the random pydantic one I have commented out - we might be able to make the logging one more generic: https://github.com/HHS/simpler-grants-gov/blob/main/api/src/logging/formatters.py#L51

[mikehgrantsgov]

FYI - when actually using this table, there might be some serialization issues as the default JSON serializer/deserializer probably won't handle things like python enums right.

We can adjust the serializer: https://github.com/HHS/simpler-grants-gov/blob/main/api/src/adapters/db/clients/postgres_client.py#L51 - however don't use the random pydantic one I have commented out - we might be able to make the logging one more generic: https://github.com/HHS/simpler-grants-gov/blob/main/api/src/logging/formatters.py#L51

I'll be sure to add a test in the ticket for the GET API.

[chouinar]

LGTM!