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Neptune has two built-in constraints:
- Each node and edge ID must be unique (so it is highly advised that if you want to maintain uniqueness via a certain value, then use that value in the built-in ~id for a node or edge).
- Each edge must have a node at either end of the edge (no dangling edges).
Beyond that, Neptune is schema-on-read. https://docs.aws.amazon.com/neptune/latest/userguide/migration-compatibility.html
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