* fix: Use savepoints to prevent race condition in get_or_create chain
Replace commit()/rollback() with begin_nested() savepoints in
get_or_create_workspace, get_or_create_peers, and get_or_create_session
so that an IntegrityError rollback in a nested call doesn't undo flushed
work from the caller. Moves transaction commit responsibility to the
outermost caller and defers cache operations to post-commit callbacks
on GetOrCreateResult.
Closes DEV-1321
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* fix: Add missing commit and post_commit in chat endpoint
The chat() endpoint in routers/peers.py called get_or_create_peers()
but discarded the result without committing or invoking post_commit().
This meant new peers created lazily via SDK chat calls were never
persisted, and cache invalidation was skipped.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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