- a newest bar with no close made load_ohlcv reject the whole frame, so the
routing layer answered with its no-data sentinel: the caller lost the entire
price history and was told the symbol may be invalid, delisted or not
covered, when only the latest session had not settled
- treat a closeless newest bar as an unsettled session instead. The gap fill
already drops it, here and mid-series alike, so the frame ends at the last
settled bar; only a range with no close anywhere is still no data
- the staleness check keeps deciding whether what remains is recent enough, so
falling back cannot resurrect a long-dead series
- log which bars had no close and which date is being used as the latest close
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