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Add uniqueness and cardinality #39

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loganmhb opened this issue Nov 10, 2018 · 0 comments

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loganmhb commented Nov 10, 2018

Right now, all attributes have a cardinality of many and do not enforce uniqueness. These should both be configurable.

For cardinality, "many" returns all non-retracted facts; "one" returns only the most recent non-retracted fact.

For uniqueness, there should be three types:

Not unique (the default, current behavior)
Unique (transactions creating an entity with a duplicate value fail)
Identity (transactions creating an entity with a duplicate value are converted to updates)

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