refactor: remove R type arg on `DbOption` #1058

Job	Run time
Rust project check (ubuntu-latest)	5m 9s
Rust exmaples	3m 25s
Rust project check (macos-latest)	7m 22s
Rust project check (windows-latest)	10m 14s
Rust fmt	22s
Rust benchmark	0s
	26m 32s

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