[Feature Request] add security to DynamoDB

## Describe the solution you'd like

Currently Admin has access to all user's conversation, bots ...etc. is there a way to make conversation encrypted!
This is critical security request!

## Why the solution needed

Security and keep Privacy

## Additional context

Add any other context or screenshots about the feature request here.

## Implementation feasibility

Are you willing to discuss the solution with us, decide on the approach, and assist with the implementation?

- [ ] Yes
- [ ] No

The issue names DynamoDB but no files, tests, or entry points. Start by locating how conversations are stored and how Admin access is authorized, then discuss the encryption and privacy approach with maintainers. Done should include an agreed implementation scope and verification that conversation access and protection meet the chosen security requirements.

Written by the indexing model from the issue text.