refactor(engine): ensure factory fails for snapshot only DB

[npepinpe]

Description

This PR fixes a compilation issue, and disables opening so-called "snapshot-only" databases, since snapshots are not supported by in-memory DBs.

Related issues

closes #866

Definition of Done

Not all items need to be done depending on the issue and the pull request.

Code changes:

• The changes are backwards compatibility with previous versions
• If it fixes a bug then PRs are created to backport the fix

Testing:

• There are unit/integration tests that verify all acceptance criterias of the issue
• New tests are written to ensure backwards compatibility with further versions
• The behavior is tested manually

Documentation:

• Javadoc has been written
• The documentation is updated

[remcowesterhoud]

LGTM! Thanks 🙏

bors merge

[ghost]

👎 Rejected by too few approved reviews

[npepinpe]

:|

[remcowesterhoud]

Oops

Bors merge

[github-actions]

Test Results

  47 files  ±0    47 suites  ±0   2m 1s ⏱️ -6s
100 tests ±0  100 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
323 runs  ±0  323 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 426e366. ± Comparison against base commit 661de72.

[ghost]

Build succeeded:

• Test summary