Technical design - how to differentiate entity types

**Acceptance Criteria:**
* Figure out data model and technical process on how we will store and retrieve entity types
* Agreement is made within both teams on how to proceed

**Definition of Ready:**
- [ ] All dependancies resolved
- [ ] AC is defined
- [ ] Estimated
- [ ] Estimation is small enough to be completed in a sprint
- [ ] Approved by SMEs / PO

**Definition of Done:**
- [ ] AC is met

No files, tests, or entry points are named. Start by defining how entity types will be represented, stored, and retrieved, then resolve dependencies and seek agreement from both teams and approval from SMEs or the PO. Done means the data model and technical process are agreed and the acceptance criteria are met.

Written by the indexing model from the issue text.