- Updated the design document to reflect the final version, incorporating multi-model support and enhanced version management features.
- Expanded the data structure section to include new entities and relationships, such as `askId`, `parentMessageId`, and `siblingIds`.
- Improved the core operation processes, including sending new messages and managing message versions.
- Added detailed diagrams and performance analysis to illustrate the new architecture and its advantages over the previous system.
- Ensured backward compatibility while introducing new functionalities for branching conversations and version control.
suyao
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