## Why are these changes needed?
| Package | Test time-Origin (Sec) | Test time-Edited (Sec) |
|-------------------------|------------------|-----------------------------------------------|
| autogen-studio | 1.64 | 1.64 |
| autogen-core | 6.03 | 6.17 |
| autogen-ext | 387.15 | 373.40 |
| autogen-agentchat | 54.20 | 20.67 |
## Related issue number
Related #6361
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## Why are these changes needed?
> Hey Victor, this is maybe a bug, but when a session is delete, runs
and messages for that session are not deleted, any reason why to keep
them?
@husseinmozannar
The main fix is to add a pragma that ensures SQL lite enforces foreign
key constraints.
Also needed to update error messages for autoupgrade of databases. Also
adds a test for cascade deletes and for parts of teammanager
With this fix,
- Messages get deleted when the run is deleted
- Runs get deleted when sessiosn are deleted
- Sessions get deleted when a team is deleted
<!-- Please give a short summary of the change and the problem this
solves. -->
## Related issue number
<!-- For example: "Closes #1234" -->
## Checks
- [ ] I've included any doc changes needed for
<https://microsoft.github.io/autogen/>. See
<https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md> to
build and test documentation locally.
- [ ] I've added tests (if relevant) corresponding to the changes
introduced in this PR.
- [ ] I've made sure all auto checks have passed.
