Support of a lifecycle pre/post upsert/save/delete hooks trough annotations

[aeifr]

After executing all tests trough gradle, the test files (instance locks) are still in the test directory. Path: src/test/resources/dbfiles/*Tests.lock/instances.json.lock

Suggestion: Temp dirs

Suggested library/module: JUnit 5: https://www.baeldung.com/junit-5-temporary-directory

Results in a cleanup after a test execution, therefore no test artifacts.