Not OP but LN is just a set of SQL databases. Every node maintains their own channels.db and uses cryptographic proofs to maintain integrity with their peers.
Yes, but that is an entirely different use case for a SQL database than what we are discussing here.
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Just do it in an SQL database and write the result on the Blockchain
Literally describing LN
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LN is a network of SQL databases that have to agree on state, yes.
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