Periodic Table Database Schema - v0.7.1
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    Type Alias HistoryEvent

    HistoryEvent:
        | DiscoveryEvent
        | FirstObservationEvent
        | IsolationEvent
        | SynthesisEvent
        | NamingEvent
        | ConfirmationEvent
        | CharacterizationEvent
        | MiscEvent

    Union of all documented scientific historical milestones.

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