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### What problem does this PR solve? Previously when LLM.rerank_model was not configured: - SDK would pass None as the value - Database field with null=False constraint would reject it - Caused storage failures for unset rerank_model cases Now: - SDK checks for None value before database operations - Provides empty string as default when rerank_model is unset ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue)