Check compatability with eiffel-event-sender

### Description

Eiffel event sender is a new repository (like this one) which will store eiffel events to a mongodb database.
We need to evaluate if we are compatible with their storage style.
If we are not, we should make ourselves compatible.

### Motivation

### Exemplification

### Benefits

Common data storage language.

### Possible Drawbacks

No files, tests, or entry points are named. Start by examining this repository's MongoDB storage model and comparing it with eiffel-event-sender's storage style; done requires an agreed compatibility assessment and any necessary changes to align the two formats.

Written by the indexing model from the issue text.