{"record":{"id":"c1739065b8039b6d","repo":"langflow-ai/langflow","slug":"failed-to-persist-knowledge-base-kb-name-with","errorCode":null,"errorMessage":"Failed to persist knowledge base '{kb_name}' with backend '{backend_type_value}'. Please retry.","messagePattern":"Failed to persist knowledge base '(.+?)' with backend '(.+?)'\\. Please retry\\.","errorType":"http","errorClass":"HTTPException","httpStatus":500,"severity":"error","filePath":"src/backend/base/langflow/api/v1/knowledge_bases.py","lineNumber":849,"sourceCode":"            }\n            await knowledge_base_service.create_record(\n                user_id=current_user.id,\n                name=kb_name,\n                model_selection=persisted_selection,\n                column_config=column_config_dicts or [],\n                backend_type=backend_type_value,\n                backend_config=backend_config_value,\n                record_id=kb_id,\n            )\n        except Exception as exc:\n            await logger.aerror(\n                \"KB DB persist failed for backend %s (kb=%s): %s — rolling back\",\n                backend_type_value,\n                kb_name,\n                exc,\n            )\n            KBStorageHelper.delete_storage(kb_path, kb_name)\n            raise HTTPException(\n                status_code=500,\n                detail=(\n                    f\"Failed to persist knowledge base '{kb_name}' with backend '{backend_type_value}'. Please retry.\"\n                ),\n            ) from exc\n\n        return KnowledgeBaseInfo(\n            id=str(kb_id),\n            dir_name=kb_name,\n            name=kb_name.replace(\"_\", \" \"),\n            embedding_provider=request.embedding_provider,\n            embedding_model=request.embedding_model,\n            size=0,\n            words=0,\n            characters=0,\n            chunks=0,\n            avg_chunk_size=0.0,\n            status=\"empty\",","sourceCodeStart":831,"sourceCodeEnd":867,"githubUrl":"https://github.com/langflow-ai/langflow/blob/976ec789d2886a86de109c044d089d68e96c9a35/src/backend/base/langflow/api/v1/knowledge_bases.py#L831-L867","documentation":"Error \"Failed to persist knowledge base '{kb_name}' with backend '{backend_type_value}'. Please retry.\" thrown in langflow-ai/langflow.","triggerScenarios":"Occurs when persisting a new knowledge base to the configured vector backend fails; a retry may succeed.","commonSituations":"See trigger scenarios.","solutions":["Retry the create request; if it persists, verify the configured vector-store backend is reachable."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"976ec789d2886a86de109c044d089d68e96c9a35","analyzedAt":"2026-08-14T18:23:12.227Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}