075 standardize persistence handling

[ernstleierzopf]

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Must haves

• I have read and followed the contributing guide lines at https://github.com/ait-aecid/logdata-anomaly-miner/wiki/Git-development-workflow
• Issues exist for this PR
• I added related issues using the "Fixes #"-notations
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Fixes #557

Submission specific

• This PR introduces breaking changes
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

Describe changes:

[whotwagner]

Let's talk about those changes after we rewrote all tests for the analysis components