refactor(db): Introduce new API for entities #161

Job	Run time
changes	9s
matrix	17s
SQLite PHP 8.5 Nextcloud stable34	1m 37s
phpunit-sqlite-summary	6s
Nextcloud stable31 php8.4 unit tests	8s
Nextcloud stable31 php8.3 unit tests	6s
	2m 23s

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