A derivation rewinds with the second clock - #557
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Closes #549. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Signed-off-by: WaylandYang <wayland0916@gmail.com>
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derived_for_entitykeptinvalidated_at IS NULLwhile the assertions beside it tookas_of, so a rewound entity showed March's facts with today's conclusions: a derivation whose premises were not on record yet (#549). The read now takesas_ofand usesrecord_axis::derived_held_at, the predicate the graph overview already used. The entity panel route andentity_factsover MCP pass the moment they had already parsed.Record. 0019's status line names this cut. A new open question records the limit that stays:
fact_derivationsis rewritten in place when a kept conclusion is reproved (0030, cut 2), so a proof has one version, and expanding a rewound derivation shows today's premises with the retracted ones marked.Test.
a_derivation_follows_the_second_clockseeds two premises recorded on March 10 and a derivation drawn on March 11, then reads at March 1 (nothing on either half), March 10 noon (the premise, no conclusion), and now (the conclusion). After invalidating the derivation on April 1 it reads at March 20 (still there, as 0019 promises) and now (gone). With the old predicate the March 1 read fails.Closes #549.
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