Set this expiry's reference fine-grid tick from the exact previous-window
Propbook Pyth observation. The source observation must be inserted into the feed
at reference_tick_source_timestamp_ms before this call, and the normalized
spot is floored to the market's tick_size. Not gated on the valuation lock:
the reference tick shapes mint admission only, and a mint it admits mid-flush is
invisible to the captured snapshot like any other.
Set this expiry's reference fine-grid tick from the exact previous-window Propbook Pyth observation. The source observation must be inserted into the feed at
reference_tick_source_timestamp_msbefore this call, and the normalized spot is floored to the market'stick_size. Not gated on the valuation lock: the reference tick shapes mint admission only, and a mint it admits mid-flush is invisible to the captured snapshot like any other.