schemas/VegCore/ERD/VegCore.ERD.mwb: event: added unique constraints for every way that the scoping fields can meaningfully be combined. these correspond to the various unique constraints offered by VegBIEN.locationevent. (the event table's constraints are always tricky because there are many ways to define an event. it is important to include all of them so that there is almost always a way to generate a natural key, without resorting to an artificial key from traceable.id_by_source.)
schemas/VegCore/ERD/VegCore.ERD.mwb: event: added unique constraints for every way that the scoping fields can meaningfully be combined. these correspond to the various unique constraints offered by VegBIEN.locationevent. (the event table's constraints are always tricky because there are many ways to define an event. it is important to include all of them so that there is almost always a way to generate a natural key, without resorting to an artificial key from traceable.id_by_source.)