fix: could not save settings, db migration remove mempool #19

# to view logs

Job	Run time
lint / bundle / checkbundle (3.10)	30s
lint / prettier / checkprettier (3.10)	32s
lint / black (3.9) / checkblack (3.9)	23s
lint / black (3.10) / checkblack (3.10)	35s
lint / mypy (3.10) / mypy (3.10)	36s
lint / mypy (3.9) / mypy (3.9)	32s
lint / pyright (3.10) / pyright (3.10)	37s
lint / pyright (3.9) / pyright (3.9)	29s
lint / ruff (3.10) / checkruff (3.10)	31s
lint / ruff (3.9) / checkruff (3.9)	28s
tests	0s
	5m 13s

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