Nutshell cleanup wishlist #67

Job	Run time
checks / mypy	42s
checks / formatting	26s
checks / ruff	7s
regtest (3.10, 1.7.1, LNbitsWallet) / regtest	2m 39s
regtest (3.10, 1.7.1, LndRestWallet) / regtest	2m 41s
regtest (3.10, 1.7.1, CoreLightningRestWallet) / regtest	2m 59s
tests (ubuntu-latest, 3.10, 1.7.1, FakeWallet) / poetry	1m 38s
tests (ubuntu-latest, 3.9, 1.7.1, FakeWallet) / poetry	1m 30s
	12m 42s

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