Revert "Try to migrate super old numeric objectIDs to strings"

This reverts commit a19d2bb52db5be52af04241109f8d95ecbe704a3.
Revert "Bump model version, migrate accidental numeric objectIDs"

This reverts commit 25db8d235010dfd6b392880857c4a536dea23cfa.
Simplify everything by just validating objectID