Basic support for overlay databases #3948

Job	Run time
Config export (macos-latest, linked)	1m 19s
Config export (ubuntu-latest, nightly-latest)	1m 1s
Config export (windows-latest, linked)	3m 46s
Config export (ubuntu-latest, linked)	1m 6s
Config export (windows-latest, nightly-latest)	3m 43s
Config export (macos-latest, nightly-latest)	1m 9s
	12m 4s

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