YueGuobin 48e2793719 feat(agent): initialize checkpointer before chat session retrieval
Add initialization check for `_checkpointer_conn` in `AgentService` to ensure the checkpointer database connection exists before attempting to retrieve chat sessions. This prevents potential null reference errors when the checkpointer hasn't been initialized yet during agent operations.
2026-03-04 22:09:09 +08:00
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