When you delete a provider you lose access to the chat history with that provider.

Steps to reproduce the behavior:

1. Start a new chat and send a message
2. Go to provider management and delete the provider you just chatted with.
3. Try to access the chat

Expected Behavior
The chat history should remain readable (read-only mode), or the user should be prompted to associate the chat with a new active provider.

Actual Behavior
The session link remains in the sidebar but clicking it results in an error.