Function parse_queued_op 

pub fn parse_queued_op(
    operation: &str,
    item_id: Option<&str>,
    payload: Option<&str>,
) -> Result<QueuedOp, String>

Turn a stored row into something pushable.

Payload keys differ by producer: the Rust reporter writes position_ticks, while syncService.queuePlaybackProgress writes camelCase positionMs. Both are accepted rather than normalised at the producer, because rows already in users’ databases were written by both.

TRACES: UR-025 | DR-131 | UT-122