sqlite: keep source database alive during backup #5249

Job	Run time
Build slim tarball	2m 15s
aarch64-darwin: with shared libraries	21m 0s
x86_64-darwin: with shared libraries	30m 20s
x86_64-linux: with shared libraries	21m 9s
aarch64-linux: with shared libraries	17m 39s
	1h 32m 23s

Provide feedback