Constant INTERNAL_EVAL_SCHEDULE_KEY 

pub const INTERNAL_EVAL_SCHEDULE_KEY: &str = "__greptime_internal_eval_schedule";

Internal transient key used to pass the serialized FlowScheduleConfig from meta to flownode through CreateRequest.flow_options. This key must never be accepted as a user-provided option and must never be persisted into FlowInfoValue.options. TODO(discord9): Replace this transient flow_options transport with a typed field in the flow create request.