Circle V2 API Docs
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    filterOptions: QueryProcedure<
        {
            input: { type: "extend"
            | "rpa" };
            meta: object;
            output: { sources: string[]; syncTypes: string[] };
        },
    > = ...

    Distinct values observed in the runs tables, for populating the superadmin filter menus: sync types for RPA runs, sources for Extend runs.