Move model update to a db migration. #77
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I originally wrote the logic that reloads the model from the persisted manifest if the serialized model version is different from the current in
bdb.LoadModel, which is called to load the model at startup, but that code path can't write the new model back to the store because it's running in the context of a read-only transaction.This PR moves the logic to a new db migration that only runs once and is able to write the new model back to the store.