@tak-ps/etl
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    Variable OutgoingBoardColumnMessageConst

    OutgoingBoardColumnMessage: TObject<
        {
            action: TEnum<typeof OutgoingAction>;
            channels: TArray<TInteger>;
            data: TRecord<TString, TUnknown>;
            type: TLiteral<BoardColumn>;
        },
    > = ...

    A Board Column lifecycle change delivered to an Outgoing Layer subscribed to board:column:<action>