Refactor database transactions #754

Job	Run time
checks / mypy	48s
checks / format	25s
checks / ruff	6s
regtest (3.10, 1.7.1, CLNRestWallet, ./test_data/test_mint) / regtest	4m 42s
regtest (3.10, 1.7.1, CoreLightningRestWallet, postgres://cashu:cashu@localhost:5432/cashu) / regtest	5m 3s
regtest (3.10, 1.7.1, CLNRestWallet, postgres://cashu:cashu@localhost:5432/cashu) / regtest	5m 10s
regtest (3.10, 1.7.1, CoreLightningRestWallet, ./test_data/test_mint) / regtest	4m 52s
regtest (3.10, 1.7.1, LNbitsWallet, postgres://cashu:cashu@localhost:5432/cashu) / regtest	4m 47s
regtest (3.10, 1.7.1, LNbitsWallet, ./test_data/test_mint) / regtest	4m 33s
regtest (3.10, 1.7.1, LndRestWallet, postgres://cashu:cashu@localhost:5432/cashu) / regtest	4m 42s
regtest (3.10, 1.7.1, LndRestWallet, ./test_data/test_mint) / regtest	4m 26s
tests (ubuntu-latest, 3.10, 1.7.1, false, postgres://cashu:cashu@localhost:5432/cashu, FakeWallet) / Run (db postgres://cashu:cashu@localhost:5432/cashu, deprecated api false)	3m 50s
tests (ubuntu-latest, 3.10, 1.7.1, true, ./test_data/test_mint, FakeWallet) / Run (db ./test_data/test_mint, deprecated api true)	3m 39s
tests (ubuntu-latest, 3.10, 1.7.1, true, postgres://cashu:cashu@localhost:5432/cashu, FakeWallet) / Run (db postgres://cashu:cashu@localhost:5432/cashu, deprecated api true)	3m 54s
tests (ubuntu-latest, 3.10, 1.7.1, false, ./test_data/test_mint, FakeWallet) / Run (db ./test_data/test_mint, deprecated api false)	3m 40s
	54m 37s

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