OptionalbatchSize?: numberMaximum number of missing event ids requested in a single REQ (default 500)
Optionalconcurrency?: numberMaximum number of EVENT uploads and REQ batches in flight at once (default 4)
Optionalreconnect?: boolean | number | Parameters<typeof retry>[0]Retry count or config for reconnecting after a dropped connection
Optionalsignal?: AbortSignalStops the sync when aborted, completing it rather than erroring it
High-level sync policy. Lifetime remains caller-owned through cancellation or composed RxJS operators.