Function record_place_order_update_push 

pub fn record_place_order_update_push(
    order_id: &str,
    trd_env: i32,
    market: i32,
    order_status: i32,
    api_response_at: SystemTime,
)

Record one Trd_UpdateOrder push candidate for PlaceOrder update-cost statistics.

Ref: APIServer_Trd_UpdateOrder.cpp:36-38 records Push_Once_Add after sending the FTAPI push. api_response_at should therefore be captured after the local push dispatch attempt.