Allow routing by older scids when we splice#8387

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rustyrussell merged 10 commits intoElementsProject:masterfrom

rustyrussell:guilt/splice-grace-period

Aug 14, 2025

Commits on Aug 13, 2025

pytest: test if we correctly route using old scids after splice
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wallet: remove now-gratuitous counters from update statements.
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Commits on Aug 14, 2025

lightningd: save previous short_channel_ids during splice, and keep in db.
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lightningd: consider old scids when looking up channels (for routing).
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lightningd: maintain a hash table of short_channel_id, for faster lookup.
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bitcoin: have random_scid() function.
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wallet: we can assume local_alias field is non-null.
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lightningd: require local_alias in new_channel().
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lightningd: use the hash table to lookup scids.
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pytest: test persistence of old scids, even if we spliced multiple times.
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