Problem: settlement can't tell a capture was taken too early

A market resolves on a captured query result. request_attestation takes that
capture and stores it in attestations; settle_market reads it back and decodes
an outcome from it.

The two are only loosely connected. request_attestation is a general primitive —
it refers to neither markets nor settle_time — it is PUBLIC, and the
query_components of any live market are readable from ob_queries. So a capture
of a market's query can be taken at any height, including well before the market
falls due, over a window that has not finished.

Settlement has no way to tell such a capture apart from one the settlement path
took after settle_time. attestations records created_height and
signed_height and no wall-clock time at all, while ob_queries.settle_time is a
unix timestamp, so the two cannot be compared from inside settle_market.

Why it matters for whichever capture is chosen

The requirement in

• https://github.com/trufnetwork/node/issues/1430

is that a market resolves against the value that existed at settle_time. The
ordering settlement uses to approximate that is chosen in:

• https://github.com/trufnetwork/node/pull/1434

Every ordering that settlement can express today is a proxy for that:

Neither can express "at or after settle_time", because the comparison is not
available. The choice between them changes which direction is exposed, not whether
one is.

What this looks like today

Nothing has been captured early: 0 of 1,319 captures on mainnet were taken at a
height below their market's creation height, and the smallest gap is +34 blocks.
This is about a window that is open rather than one that is being used.

What would close it

Settlement needs to be able to tell whether a capture was taken within the window
the market settles on. A block timestamp recorded alongside created_height at
capture time would make the comparison expressible; so would anything else that
lets settle_market place a capture relative to settle_time.

Existing rows would need whatever is added to be backfilled, since the value is
not recoverable from attestations alone.