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Implemented singleton collection type feature. SaveCollection method of Collection DAO now checks if collection is new and if it's type is "singleton" and creates empty record with ID set to "default". It does not trigger any events. I assumed it's not necessary, because prior this, said collection does not exist.
On the UI side created new component named RecordSingleton. Now PageRecords component renders RecordSingleton or RecordsList component based on active collection's type. New component is created based on RecordUpsertPanel component, so there is some code repetition. Might create new, reusable, component like RecordForm or RecordSchemaFields in the future, so we could implement new features, new field types in shared component.