fix: this end is not a function error

[avallete]

What kind of change does this PR introduce?

In some cases, the this.end function call raise a this.end is not a function error.
Use the .bind method instead. And wrap the whole connection ending into a try/catch to ensure that unexpected ending error won't cause issue to the server.

[coveralls]

Pull Request Test Coverage Report for Build 14333974906

Details

• 3 of 5 (60.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 75.874%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/lib/db.ts	3	5	60.0%

Totals
Change from base Build 14333744901:	-0.03%
Covered Lines:	4981
Relevant Lines:	6482

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💛 - Coveralls