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Updates for Pydantic v2
This PR incorporates changes to each DB's API and ingestion routines to work with Pydantic v2. Because of the ~5x performance improvement seen when using Pydantic v2, we don't need to focus on optimizing the bulk ingestion too much during the validation stage -- as a result, alongside syntactic and API changes for Pydantic, the portions of the code that use multiprocessing for validation are simplified (and not required, because multiprocessing involves its own overhead).