feat: update core backend services including LLM, embedding, KB, orchestrator and admin APIs [AC-AISVC-CORE]

ai-service/app/api/admin/__init__.py

@@ -2,6 +2,7 @@
 Admin API routes for AI Service management.
 [AC-ASA-01, AC-ASA-02, AC-ASA-05, AC-ASA-07, AC-ASA-08, AC-AISVC-50] Admin management endpoints.
 [AC-MRS-07,08,16] Slot definition management endpoints.
+[AC-SCENE-SLOT-01] Scene slot bundle management endpoints.
 """
 
 from app.api.admin.api_key import router as api_key_router
@@ -18,6 +19,7 @@ from app.api.admin.metadata_schema import router as metadata_schema_router
 from app.api.admin.monitoring import router as monitoring_router
 from app.api.admin.prompt_templates import router as prompt_templates_router
 from app.api.admin.rag import router as rag_router
+from app.api.admin.scene_slot_bundle import router as scene_slot_bundle_router
 from app.api.admin.script_flows import router as script_flows_router
 from app.api.admin.sessions import router as sessions_router
 from app.api.admin.slot_definition import router as slot_definition_router
@@ -38,6 +40,7 @@ __all__ = [
     "monitoring_router",
     "prompt_templates_router",
     "rag_router",
+    "scene_slot_bundle_router",
     "script_flows_router",
     "sessions_router",
     "slot_definition_router",

ai-service/app/api/admin/intent_rules.py

@@ -2,6 +2,8 @@
 Intent Rule Management API.
 [AC-AISVC-65~AC-AISVC-68] Intent rule CRUD endpoints.
 [AC-AISVC-96] Intent rule testing endpoint.
+[AC-AISVC-116] Fusion config management endpoints.
+[AC-AISVC-114] Intent vector generation endpoint.
 """
 
 import logging
@@ -14,6 +16,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.database import get_session
 from app.models.entities import IntentRuleCreate, IntentRuleUpdate
+from app.services.intent.models import DEFAULT_FUSION_CONFIG, FusionConfig
 from app.services.intent.rule_service import IntentRuleService
 from app.services.intent.tester import IntentRuleTester
 
@@ -21,6 +24,8 @@ logger = logging.getLogger(__name__)
 
 router = APIRouter(prefix="/admin/intent-rules", tags=["Intent Rules"])
 
+_fusion_config = FusionConfig()
+
 
 def get_tenant_id(x_tenant_id: str = Header(..., alias="X-Tenant-Id")) -> str:
     """Extract tenant ID from header."""
@@ -204,3 +209,109 @@ async def test_rule(
     result = await tester.test_rule(rule, [body.message], all_rules)
 
     return result.to_dict()
+
+
+class FusionConfigUpdate(BaseModel):
+    """Request body for updating fusion config."""
+
+    w_rule: float | None = None
+    w_semantic: float | None = None
+    w_llm: float | None = None
+    semantic_threshold: float | None = None
+    conflict_threshold: float | None = None
+    gray_zone_threshold: float | None = None
+    min_trigger_threshold: float | None = None
+    clarify_threshold: float | None = None
+    multi_intent_threshold: float | None = None
+    llm_judge_enabled: bool | None = None
+    semantic_matcher_enabled: bool | None = None
+    semantic_matcher_timeout_ms: int | None = None
+    llm_judge_timeout_ms: int | None = None
+    semantic_top_k: int | None = None
+
+
+@router.get("/fusion-config")
+async def get_fusion_config() -> dict[str, Any]:
+    """
+    [AC-AISVC-116] Get current fusion configuration.
+    """
+    logger.info("[AC-AISVC-116] Getting fusion config")
+    return _fusion_config.to_dict()
+
+
+@router.put("/fusion-config")
+async def update_fusion_config(
+    body: FusionConfigUpdate,
+) -> dict[str, Any]:
+    """
+    [AC-AISVC-116] Update fusion configuration.
+    """
+    global _fusion_config
+
+    logger.info(f"[AC-AISVC-116] Updating fusion config: {body.model_dump()}")
+
+    current_dict = _fusion_config.to_dict()
+    update_dict = body.model_dump(exclude_none=True)
+    current_dict.update(update_dict)
+    _fusion_config = FusionConfig.from_dict(current_dict)
+
+    return _fusion_config.to_dict()
+
+
+@router.post("/{rule_id}/generate-vector")
+async def generate_intent_vector(
+    rule_id: uuid.UUID,
+    tenant_id: str = Depends(get_tenant_id),
+    session: AsyncSession = Depends(get_session),
+) -> dict[str, Any]:
+    """
+    [AC-AISVC-114] Generate intent vector for a rule.
+    
+    Uses the rule's semantic_examples to generate an average vector.
+    If no semantic_examples exist, returns an error.
+    """
+    logger.info(
+        f"[AC-AISVC-114] Generating intent vector for tenant={tenant_id}, rule_id={rule_id}"
+    )
+
+    service = IntentRuleService(session)
+    rule = await service.get_rule(tenant_id, rule_id)
+
+    if not rule:
+        raise HTTPException(status_code=404, detail="Intent rule not found")
+
+    if not rule.semantic_examples:
+        raise HTTPException(
+            status_code=400,
+            detail="Rule has no semantic_examples. Please add semantic_examples first."
+        )
+
+    try:
+        from app.core.dependencies import get_embedding_provider
+        embedding_provider = get_embedding_provider()
+        
+        vectors = await embedding_provider.embed_batch(rule.semantic_examples)
+        
+        import numpy as np
+        avg_vector = np.mean(vectors, axis=0).tolist()
+        
+        update_data = IntentRuleUpdate(intent_vector=avg_vector)
+        updated_rule = await service.update_rule(tenant_id, rule_id, update_data)
+        
+        logger.info(
+            f"[AC-AISVC-114] Generated intent vector for rule={rule_id}, "
+            f"dimension={len(avg_vector)}"
+        )
+        
+        return {
+            "id": str(updated_rule.id),
+            "intent_vector": updated_rule.intent_vector,
+            "semantic_examples": updated_rule.semantic_examples,
+        }
+        
+    except Exception as e:
+        logger.error(f"[AC-AISVC-114] Failed to generate intent vector: {e}")
+        raise HTTPException(
+            status_code=500,
+            detail=f"Failed to generate intent vector: {str(e)}"
+        )

ai-service/app/api/admin/kb.py

@@ -6,28 +6,35 @@ Knowledge Base management endpoints.
 
 import logging
 import uuid
+import json
+import hashlib
 from dataclasses import dataclass
 from typing import Annotated, Any, Optional
 
 import tiktoken
-from fastapi import APIRouter, BackgroundTasks, Depends, File, Form, Query, UploadFile
+from fastapi import APIRouter, BackgroundTasks, Depends, File, Form, HTTPException, Query, UploadFile
 from fastapi.responses import JSONResponse
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from app.core.config import get_settings
 from app.core.database import get_session
 from app.core.exceptions import MissingTenantIdException
 from app.core.tenant import get_tenant_id
 from app.models import ErrorResponse
 from app.models.entities import (
+    Document,
+    DocumentStatus,
     IndexJob,
     IndexJobStatus,
     KBType,
+    KnowledgeBase,
     KnowledgeBaseCreate,
     KnowledgeBaseUpdate,
 )
 from app.services.kb import KBService
 from app.services.knowledge_base_service import KnowledgeBaseService
+from app.services.metadata_field_definition_service import MetadataFieldDefinitionService
 
 logger = logging.getLogger(__name__)
 
@@ -457,6 +464,7 @@ async def list_documents(
             "kbId": doc.kb_id,
             "fileName": doc.file_name,
             "status": doc.status,
+            "metadata": doc.doc_metadata,
             "jobId": str(latest_job.id) if latest_job else None,
             "createdAt": doc.created_at.isoformat() + "Z",
             "updatedAt": doc.updated_at.isoformat() + "Z",
@@ -585,6 +593,7 @@ async def upload_document(
         file_name=file.filename or "unknown",
         file_content=file_content,
         file_type=file.content_type,
+        metadata=metadata_dict,
     )
 
     await kb_service.update_doc_count(tenant_id, kb_id, delta=1)
@@ -915,3 +924,488 @@ async def delete_document(
             "message": "Document deleted",
         }
     )
+
+
+@router.put(
+    "/documents/{doc_id}/metadata",
+    operation_id="updateDocumentMetadata",
+    summary="Update document metadata",
+    description="[AC-ASA-08] Update metadata for a specific document.",
+    responses={
+        200: {"description": "Metadata updated"},
+        404: {"description": "Document not found"},
+        401: {"description": "Unauthorized", "model": ErrorResponse},
+        403: {"description": "Forbidden", "model": ErrorResponse},
+    },
+)
+async def update_document_metadata(
+    tenant_id: Annotated[str, Depends(get_current_tenant_id)],
+    session: Annotated[AsyncSession, Depends(get_session)],
+    doc_id: str,
+    body: dict,
+) -> JSONResponse:
+    """
+    [AC-ASA-08] Update document metadata.
+    """
+    import json
+    
+    metadata = body.get("metadata")
+    
+    if metadata is not None and not isinstance(metadata, dict):
+        try:
+            metadata = json.loads(metadata) if isinstance(metadata, str) else metadata
+        except json.JSONDecodeError:
+            return JSONResponse(
+                status_code=400,
+                content={
+                    "code": "INVALID_METADATA",
+                    "message": "Invalid JSON format for metadata",
+                },
+            )
+    
+    logger.info(
+        f"[AC-ASA-08] Updating document metadata: tenant={tenant_id}, doc_id={doc_id}"
+    )
+
+    from sqlalchemy import select
+    from app.models.entities import Document
+    
+    stmt = select(Document).where(
+        Document.tenant_id == tenant_id,
+        Document.id == doc_id,
+    )
+    result = await session.execute(stmt)
+    document = result.scalar_one_or_none()
+
+    if not document:
+        return JSONResponse(
+            status_code=404,
+            content={
+                "code": "DOCUMENT_NOT_FOUND",
+                "message": f"Document {doc_id} not found",
+            },
+        )
+
+    document.doc_metadata = metadata
+    await session.commit()
+
+    return JSONResponse(
+        content={
+            "success": True,
+            "message": "Metadata updated",
+            "metadata": document.doc_metadata,
+        }
+    )
+
+
+@router.post(
+    "/documents/batch-upload",
+    operation_id="batchUploadDocuments",
+    summary="Batch upload documents from zip",
+    description="Upload a zip file containing multiple folders, each with a markdown file and metadata.json",
+    responses={
+        200: {"description": "Batch upload result"},
+        400: {"description": "Bad Request - invalid zip or missing files"},
+        401: {"description": "Unauthorized", "model": ErrorResponse},
+        403: {"description": "Forbidden", "model": ErrorResponse},
+    },
+)
+async def batch_upload_documents(
+    tenant_id: Annotated[str, Depends(get_current_tenant_id)],
+    session: Annotated[AsyncSession, Depends(get_session)],
+    background_tasks: BackgroundTasks,
+    file: UploadFile = File(...),
+    kb_id: str = Form(...),
+) -> JSONResponse:
+    """
+    Batch upload documents from a zip file.
+    
+    Zip structure:
+    - Each folder contains one .md file and one metadata.json
+    - metadata.json uses field_key from MetadataFieldDefinition as keys
+    
+    Example metadata.json:
+    {
+        "grade": "高一",
+        "subject": "数学",
+        "type": "痛点"
+    }
+    """
+    import json
+    import tempfile
+    import zipfile
+    from pathlib import Path
+    
+    from app.services.metadata_field_definition_service import MetadataFieldDefinitionService
+    
+    logger.info(
+        f"[BATCH-UPLOAD] Starting batch upload: tenant={tenant_id}, "
+        f"kb_id={kb_id}, filename={file.filename}"
+    )
+    
+    if not file.filename or not file.filename.lower().endswith('.zip'):
+        return JSONResponse(
+            status_code=400,
+            content={
+                "code": "INVALID_FORMAT",
+                "message": "Only .zip files are supported",
+            },
+        )
+    
+    kb_service = KnowledgeBaseService(session)
+    kb = await kb_service.get_knowledge_base(tenant_id, kb_id)
+    if not kb:
+        return JSONResponse(
+            status_code=404,
+            content={
+                "code": "KB_NOT_FOUND",
+                "message": f"Knowledge base {kb_id} not found",
+            },
+        )
+    
+    file_content = await file.read()
+    
+    results = []
+    succeeded = 0
+    failed = 0
+    
+    with tempfile.TemporaryDirectory() as temp_dir:
+        zip_path = Path(temp_dir) / "upload.zip"
+        with open(zip_path, "wb") as f:
+            f.write(file_content)
+        
+        try:
+            with zipfile.ZipFile(zip_path, 'r') as zf:
+                zf.extractall(temp_dir)
+        except zipfile.BadZipFile as e:
+            return JSONResponse(
+                status_code=400,
+                content={
+                    "code": "INVALID_ZIP",
+                    "message": f"Invalid zip file: {str(e)}",
+                },
+            )
+        
+        extracted_path = Path(temp_dir)
+        
+        # 列出解压后的所有内容，用于调试
+        all_items = list(extracted_path.iterdir())
+        logger.info(f"[BATCH-UPLOAD] Extracted items: {[item.name for item in all_items]}")
+        
+        # 递归查找所有包含 content.txt/md 和 metadata.json 的文件夹
+        def find_document_folders(path: Path) -> list[Path]:
+            """递归查找所有包含文档文件的文件夹"""
+            doc_folders = []
+            
+            # 检查当前文件夹是否包含文档文件
+            content_files = (
+                list(path.glob("*.md")) + 
+                list(path.glob("*.markdown")) + 
+                list(path.glob("*.txt"))
+            )
+            
+            if content_files:
+                # 这个文件夹包含文档文件，是一个文档文件夹
+                doc_folders.append(path)
+                logger.info(f"[BATCH-UPLOAD] Found document folder: {path.name}, files: {[f.name for f in content_files]}")
+            
+            # 递归检查子文件夹
+            for subfolder in [p for p in path.iterdir() if p.is_dir()]:
+                doc_folders.extend(find_document_folders(subfolder))
+            
+            return doc_folders
+        
+        folders = find_document_folders(extracted_path)
+        
+        if not folders:
+            logger.error(f"[BATCH-UPLOAD] No document folders found in zip. Items found: {[item.name for item in all_items]}")
+            return JSONResponse(
+                status_code=400,
+                content={
+                    "code": "NO_DOCUMENTS_FOUND",
+                    "message": "压缩包中没有找到包含 .txt/.md 文件的文件夹",
+                    "details": {
+                        "expected_structure": "每个文件夹应包含 content.txt (或 .md) 和 metadata.json",
+                        "found_items": [item.name for item in all_items],
+                    },
+                },
+            )
+        
+        logger.info(f"[BATCH-UPLOAD] Found {len(folders)} document folders")
+        
+        for folder in folders:
+            folder_name = folder.name if folder != extracted_path else "root"
+            
+            content_files = (
+                list(folder.glob("*.md")) + 
+                list(folder.glob("*.markdown")) + 
+                list(folder.glob("*.txt"))
+            )
+            
+            if not content_files:
+                # 这种情况不应该发生，因为我们已经过滤过了
+                failed += 1
+                results.append({
+                    "folder": folder_name,
+                    "status": "failed",
+                    "error": "No content file found",
+                })
+                continue
+            
+            content_file = content_files[0]
+            metadata_file = folder / "metadata.json"
+            
+            metadata_dict = {}
+            if metadata_file.exists():
+                try:
+                    with open(metadata_file, 'r', encoding='utf-8') as f:
+                        metadata_dict = json.load(f)
+                except json.JSONDecodeError as e:
+                    failed += 1
+                    results.append({
+                        "folder": folder_name,
+                        "status": "failed",
+                        "error": f"Invalid metadata.json: {str(e)}",
+                    })
+                    continue
+            else:
+                logger.warning(f"[BATCH-UPLOAD] No metadata.json in folder {folder_name}, using empty metadata")
+            
+            field_def_service = MetadataFieldDefinitionService(session)
+            is_valid, validation_errors = await field_def_service.validate_metadata_for_create(
+                tenant_id, metadata_dict, "kb_document"
+            )
+            
+            if not is_valid:
+                failed += 1
+                results.append({
+                    "folder": folder_name,
+                    "status": "failed",
+                    "error": f"Metadata validation failed: {validation_errors}",
+                })
+                continue
+            
+            try:
+                with open(content_file, 'rb') as f:
+                    doc_content = f.read()
+                
+                file_ext = content_file.suffix.lower()
+                if file_ext == '.txt':
+                    file_type = "text/plain"
+                else:
+                    file_type = "text/markdown"
+                
+                doc_kb_service = KBService(session)
+                document, job = await doc_kb_service.upload_document(
+                    tenant_id=tenant_id,
+                    kb_id=kb_id,
+                    file_name=content_file.name,
+                    file_content=doc_content,
+                    file_type=file_type,
+                    metadata=metadata_dict,
+                )
+                
+                await kb_service.update_doc_count(tenant_id, kb_id, delta=1)
+                await session.commit()
+                
+                background_tasks.add_task(
+                    _index_document,
+                    tenant_id,
+                    kb_id,
+                    str(job.id),
+                    str(document.id),
+                    doc_content,
+                    content_file.name,
+                    metadata_dict,
+                )
+                
+                succeeded += 1
+                results.append({
+                    "folder": folder_name,
+                    "docId": str(document.id),
+                    "jobId": str(job.id),
+                    "status": "created",
+                    "fileName": content_file.name,
+                })
+                
+                logger.info(
+                    f"[BATCH-UPLOAD] Created document: folder={folder_name}, "
+                    f"doc_id={document.id}, job_id={job.id}"
+                )
+                
+            except Exception as e:
+                failed += 1
+                results.append({
+                    "folder": folder_name,
+                    "status": "failed",
+                    "error": str(e),
+                })
+                logger.error(f"[BATCH-UPLOAD] Failed to create document: folder={folder_name}, error={e}")
+    
+    logger.info(
+        f"[BATCH-UPLOAD] Completed: total={len(results)}, succeeded={succeeded}, failed={failed}"
+    )
+    
+    return JSONResponse(
+        content={
+            "success": True,
+            "total": len(results),
+            "succeeded": succeeded,
+            "failed": failed,
+            "results": results,
+        }
+    )
+
+
+@router.post(
+    "/{kb_id}/documents/json-batch",
+    summary="[AC-KB-03] JSON批量上传文档",
+    description="上传JSONL格式文件，每行一个JSON对象，包含text和元数据字段",
+)
+async def upload_json_batch(
+    kb_id: str,
+    tenant_id: str = Query(..., description="租户ID"),
+    file: UploadFile = File(..., description="JSONL格式文件，每行一个JSON对象"),
+    session: AsyncSession = Depends(get_session),
+    background_tasks: BackgroundTasks = None,
+):
+    """
+    JSON批量上传文档
+    
+    文件格式：JSONL (每行一个JSON对象)
+    必填字段：text - 需要录入知识库的文本内容
+    可选字段：元数据字段（如grade, subject, kb_scene等）
+    
+    示例：
+    {"text": "课程内容...", "grade": "初二", "subject": "数学", "kb_scene": "课程咨询"}
+    {"text": "另一条课程内容...", "grade": "初三", "info_type": "课程概述"}
+    """
+    kb = await session.get(KnowledgeBase, kb_id)
+    if not kb:
+        raise HTTPException(status_code=404, detail="知识库不存在")
+    
+    if kb.tenant_id != tenant_id:
+        raise HTTPException(status_code=403, detail="无权访问此知识库")
+    
+    valid_field_keys = set()
+    try:
+        field_defs = await MetadataFieldDefinitionService(session).get_fields(
+            tenant_id=tenant_id,
+            include_inactive=False,
+        )
+        valid_field_keys = {f.field_key for f in field_defs}
+        logger.info(f"[AC-KB-03] Valid metadata fields for tenant {tenant_id}: {valid_field_keys}")
+    except Exception as e:
+        logger.warning(f"[AC-KB-03] Failed to get metadata fields: {e}")
+    
+    content = await file.read()
+    try:
+        text_content = content.decode("utf-8")
+    except UnicodeDecodeError:
+        try:
+            text_content = content.decode("gbk")
+        except UnicodeDecodeError:
+            raise HTTPException(status_code=400, detail="文件编码不支持，请使用UTF-8编码")
+    
+    lines = text_content.strip().split("\n")
+    if not lines:
+        raise HTTPException(status_code=400, detail="文件内容为空")
+    
+    results = []
+    succeeded = 0
+    failed = 0
+    
+    kb_service = KBService(session)
+    
+    for line_num, line in enumerate(lines, 1):
+        line = line.strip()
+        if not line:
+            continue
+        
+        try:
+            json_obj = json.loads(line)
+        except json.JSONDecodeError as e:
+            failed += 1
+            results.append({
+                "line": line_num,
+                "success": False,
+                "error": f"JSON解析失败: {e}",
+            })
+            continue
+        
+        text = json_obj.get("text")
+        if not text:
+            failed += 1
+            results.append({
+                "line": line_num,
+                "success": False,
+                "error": "缺少必填字段: text",
+            })
+            continue
+        
+        metadata = {}
+        for key, value in json_obj.items():
+            if key == "text":
+                continue
+            if valid_field_keys and key not in valid_field_keys:
+                logger.debug(f"[AC-KB-03] Skipping invalid metadata field: {key}")
+                continue
+            if value is not None:
+                metadata[key] = value
+        
+        try:
+            file_name = f"json_batch_line_{line_num}.txt"
+            file_content = text.encode("utf-8")
+            
+            document, job = await kb_service.upload_document(
+                tenant_id=tenant_id,
+                kb_id=kb_id,
+                file_name=file_name,
+                file_content=file_content,
+                file_type="text/plain",
+                metadata=metadata,
+            )
+            
+            if background_tasks:
+                background_tasks.add_task(
+                    _index_document,
+                    tenant_id,
+                    kb_id,
+                    str(job.id),
+                    str(document.id),
+                    file_content,
+                    file_name,
+                    metadata,
+                )
+            
+            succeeded += 1
+            results.append({
+                "line": line_num,
+                "success": True,
+                "doc_id": str(document.id),
+                "job_id": str(job.id),
+                "metadata": metadata,
+            })
+        except Exception as e:
+            failed += 1
+            results.append({
+                "line": line_num,
+                "success": False,
+                "error": str(e),
+            })
+            logger.error(f"[AC-KB-03] Failed to upload document at line {line_num}: {e}")
+    
+    await session.commit()
+    
+    logger.info(f"[AC-KB-03] JSON batch upload completed: kb_id={kb_id}, total={len(lines)}, succeeded={succeeded}, failed={failed}")
+    
+    return JSONResponse(
+        content={
+            "success": True,
+            "total": len(lines),
+            "succeeded": succeeded,
+            "failed": failed,
+            "valid_metadata_fields": list(valid_field_keys) if valid_field_keys else [],
+            "results": results,
+        }
+    )

ai-service/app/api/admin/metadata_field_definition.py

@@ -51,6 +51,7 @@ def _field_to_dict(f: MetadataFieldDefinition) -> dict[str, Any]:
         "scope": f.scope,
         "is_filterable": f.is_filterable,
         "is_rank_feature": f.is_rank_feature,
+        "usage_description": f.usage_description,
         "field_roles": f.field_roles or [],
         "status": f.status,
         "version": f.version,

ai-service/app/api/admin/monitoring.py

@@ -407,6 +407,7 @@ async def get_conversation_detail(
         "guardrailTriggered": user_msg.guardrail_triggered,
         "guardrailWords": user_msg.guardrail_words,
         "executionSteps": execution_steps,
+        "routeTrace": user_msg.route_trace,
         "createdAt": user_msg.created_at.isoformat(),
     }
 
@@ -659,8 +660,56 @@ async def _process_export(
         except Exception as e:
             logger.error(f"[AC-AISVC-110] Export failed: task_id={task_id}, error={e}")
 
-            task = await session.get(ExportTask, task_id)
+            task = task_status.get(ExportTask, task_id)
             if task:
                 task.status = ExportTaskStatus.FAILED.value
                 task.error_message = str(e)
                 await session.commit()
+
+
+@router.get("/clarification-metrics")
+async def get_clarification_metrics(
+    tenant_id: str = Depends(get_tenant_id),
+    total_requests: int = Query(100, ge=1, description="Total requests for rate calculation"),
+) -> dict[str, Any]:
+    """
+    [AC-CLARIFY] Get clarification metrics.
+    
+    Returns:
+    - clarify_trigger_rate: 澄清触发率
+    - clarify_converge_rate: 澄清后收敛率
+    - misroute_rate: 误入流程率
+    """
+    from app.services.intent.clarification import get_clarify_metrics
+    
+    metrics = get_clarify_metrics()
+    counts = metrics.get_metrics()
+    rates = metrics.get_rates(total_requests)
+    
+    return {
+        "counts": counts,
+        "rates": rates,
+        "thresholds": {
+            "t_high": 0.75,
+            "t_low": 0.45,
+            "max_retry": 3,
+        },
+    }
+
+
+@router.post("/clarification-metrics/reset")
+async def reset_clarification_metrics(
+    tenant_id: str = Depends(get_tenant_id),
+) -> dict[str, Any]:
+    """
+    [AC-CLARIFY] Reset clarification metrics.
+    """
+    from app.services.intent.clarification import get_clarify_metrics
+    
+    metrics = get_clarify_metrics()
+    metrics.reset()
+    
+    return {
+        "status": "reset",
+        "message": "Clarification metrics have been reset.",
+    }

ai-service/app/core/config.py

@@ -64,6 +64,7 @@ class Settings(BaseSettings):
     redis_enabled: bool = True
     dashboard_cache_ttl: int = 60
     stats_counter_ttl: int = 7776000
+    slot_state_cache_ttl: int = 1800
 
     frontend_base_url: str = "http://localhost:3000"
 

ai-service/app/core/database.py

@@ -20,7 +20,7 @@ engine = create_async_engine(
     settings.database_url,
     pool_size=settings.database_pool_size,
     max_overflow=settings.database_max_overflow,
-    echo=settings.debug,
+    echo=False,
     pool_pre_ping=True,
 )
 

ai-service/app/core/middleware.py

@@ -114,7 +114,12 @@ class ApiKeyMiddleware(BaseHTTPMiddleware):
                 from app.core.database import async_session_maker
                 async with async_session_maker() as session:
                     await service.initialize(session)
-                    logger.info(f"[AC-AISVC-50] API key service lazy initialized with {len(service._keys_cache)} keys")
+                    if service._initialized and len(service._keys_cache) > 0:
+                        logger.info(f"[AC-AISVC-50] API key service lazy initialized with {len(service._keys_cache)} keys")
+                    elif service._initialized and len(service._keys_cache) == 0:
+                        logger.warning("[AC-AISVC-50] API key service initialized but no keys found in database")
+                    else:
+                        logger.error("[AC-AISVC-50] API key service lazy initialization failed")
             except Exception as e:
                 logger.error(f"[AC-AISVC-50] Failed to initialize API key service: {e}")
 

ai-service/app/core/qdrant_client.py

@@ -272,20 +272,24 @@ class QdrantClient:
         score_threshold: float | None = None,
         vector_name: str = "full",
         with_vectors: bool = False,
+        metadata_filter: dict[str, Any] | None = None,
+        kb_ids: list[str] | None = None,
     ) -> list[dict[str, Any]]:
         """
-        [AC-AISVC-10] Search vectors in tenant's collection.
+        [AC-AISVC-10] Search vectors in tenant's collections.
         Returns results with score >= score_threshold if specified.
-        Searches both old format (with @) and new format (with _) for backward compatibility.
+        Searches all collections for the tenant (multi-KB support).
 
         Args:
             tenant_id: Tenant identifier
             query_vector: Query vector for similarity search
-            limit: Maximum number of results
+            limit: Maximum number of results per collection
             score_threshold: Minimum score threshold for results
             vector_name: Name of the vector to search (for multi-vector collections)
                          Default is "full" for 768-dim vectors in Matryoshka setup.
             with_vectors: Whether to return vectors in results (for two-stage reranking)
+            metadata_filter: Optional metadata filter to apply during search
+            kb_ids: Optional list of knowledge base IDs to restrict search to specific KBs
         """
         client = await self.get_client()
 
@@ -293,21 +297,36 @@ class QdrantClient:
             f"[AC-AISVC-10] Starting search: tenant_id={tenant_id}, "
             f"limit={limit}, score_threshold={score_threshold}, vector_dim={len(query_vector)}, vector_name={vector_name}"
         )
+        if metadata_filter:
+            logger.info(f"[AC-AISVC-10] Metadata filter: {metadata_filter}")
 
-        collection_names = [self.get_collection_name(tenant_id)]
+        # 构建 Qdrant filter
-        if '@' in tenant_id:
+        qdrant_filter = None
-            old_format = f"{self._collection_prefix}{tenant_id}"
+        if metadata_filter:
-            new_format = f"{self._collection_prefix}{tenant_id.replace('@', '_')}"
+            qdrant_filter = self._build_qdrant_filter(metadata_filter)
-            collection_names = [new_format, old_format]
+            logger.info(f"[AC-AISVC-10] Qdrant filter: {qdrant_filter}")
 
-        logger.info(f"[AC-AISVC-10] Will search in collections: {collection_names}")
+        # 获取该租户的所有 collections
+        collection_names = await self._get_tenant_collections(client, tenant_id)
+        
+        # 如果指定了 kb_ids，则只搜索指定的知识库 collections
+        if kb_ids:
+            target_collections = []
+            for kb_id in kb_ids:
+                kb_collection_name = self.get_kb_collection_name(tenant_id, kb_id)
+                if kb_collection_name in collection_names:
+                    target_collections.append(kb_collection_name)
+                else:
+                    logger.warning(f"[AC-AISVC-10] KB collection not found: {kb_collection_name} for kb_id={kb_id}")
+            collection_names = target_collections
+            logger.info(f"[AC-AISVC-10] Restricted to {len(collection_names)} KB collections: {collection_names}")
+        else:
+            logger.info(f"[AC-AISVC-10] Will search in {len(collection_names)} collections: {collection_names}")
 
         all_hits = []
 
         for collection_name in collection_names:
             try:
-                logger.info(f"[AC-AISVC-10] Searching in collection: {collection_name}")
-
                 exists = await client.collection_exists(collection_name)
                 if not exists:
                     logger.warning(f"[AC-AISVC-10] Collection {collection_name} does not exist")
@@ -321,6 +340,7 @@ class QdrantClient:
                         limit=limit,
                         with_vectors=with_vectors,
                         score_threshold=score_threshold,
+                        query_filter=qdrant_filter,
                     )
                 except Exception as e:
                     if "vector name" in str(e).lower() or "Not existing vector" in str(e) or "using" in str(e).lower():
@@ -334,6 +354,7 @@ class QdrantClient:
                             limit=limit,
                             with_vectors=with_vectors,
                             score_threshold=score_threshold,
+                            query_filter=qdrant_filter,
                         )
                     else:
                         raise
@@ -348,6 +369,7 @@ class QdrantClient:
                         "id": str(result.id),
                         "score": result.score,
                         "payload": result.payload or {},
+                        "collection": collection_name,  # 添加 collection 信息
                     }
                     if with_vectors and result.vector:
                         hit["vector"] = result.vector
@@ -358,10 +380,6 @@ class QdrantClient:
                     logger.info(
                         f"[AC-AISVC-10] Search in collection {collection_name}: {len(hits)} results for tenant={tenant_id}"
                     )
-                    for i, h in enumerate(hits[:3]):
-                        logger.debug(
-                            f"[AC-AISVC-10] Hit {i+1}: id={h['id']}, score={h['score']:.4f}"
-                        )
                 else:
                     logger.warning(
                         f"[AC-AISVC-10] Collection {collection_name} returned no hits (filtered or empty)"
@@ -370,9 +388,10 @@ class QdrantClient:
                 logger.warning(
                     f"[AC-AISVC-10] Collection {collection_name} not found or error: {e}"
                 )
-                continue
 
-        all_hits = sorted(all_hits, key=lambda x: x["score"], reverse=True)[:limit]
+        # 按分数排序并返回 top results
+        all_hits.sort(key=lambda x: x["score"], reverse=True)
+        all_hits = all_hits[:limit]
 
         logger.info(
             f"[AC-AISVC-10] Search returned {len(all_hits)} total results for tenant={tenant_id}"
@@ -386,6 +405,113 @@ class QdrantClient:
 
         return all_hits
 
+    async def _get_tenant_collections(
+        self,
+        client: AsyncQdrantClient,
+        tenant_id: str,
+    ) -> list[str]:
+        """
+        获取指定租户的所有 collections。
+        优先从 Redis 缓存获取，未缓存则从 Qdrant 查询并缓存。
+        
+        Args:
+            client: Qdrant client
+            tenant_id: 租户 ID
+            
+        Returns:
+            Collection 名称列表
+        """
+        import time
+        start_time = time.time()
+        
+        # 1. 尝试从缓存获取
+        from app.services.metadata_cache_service import get_metadata_cache_service
+        cache_service = await get_metadata_cache_service()
+        cache_key = f"collections:{tenant_id}"
+        
+        try:
+            # 确保 Redis 连接已初始化
+            redis_client = await cache_service._get_redis()
+            if redis_client and cache_service._enabled:
+                cached = await redis_client.get(cache_key)
+                if cached:
+                    import json
+                    collections = json.loads(cached)
+                    logger.info(
+                        f"[AC-AISVC-10] Cache hit: Found {len(collections)} collections "
+                        f"for tenant={tenant_id} in {(time.time() - start_time)*1000:.2f}ms"
+                    )
+                    return collections
+        except Exception as e:
+            logger.warning(f"[AC-AISVC-10] Cache get error: {e}")
+        
+        # 2. 从 Qdrant 查询
+        safe_tenant_id = tenant_id.replace('@', '_')
+        prefix = f"{self._collection_prefix}{safe_tenant_id}"
+        
+        try:
+            collections = await client.get_collections()
+            tenant_collections = [
+                c.name for c in collections.collections
+                if c.name.startswith(prefix)
+            ]
+            
+            # 按名称排序
+            tenant_collections.sort()
+            
+            db_time = (time.time() - start_time) * 1000
+            logger.info(
+                f"[AC-AISVC-10] Found {len(tenant_collections)} collections from Qdrant "
+                f"for tenant={tenant_id} in {db_time:.2f}ms: {tenant_collections}"
+            )
+            
+            # 3. 缓存结果（5分钟 TTL）
+            try:
+                redis_client = await cache_service._get_redis()
+                if redis_client and cache_service._enabled:
+                    import json
+                    await redis_client.setex(
+                        cache_key,
+                        300,  # 5分钟
+                        json.dumps(tenant_collections)
+                    )
+                    logger.info(f"[AC-AISVC-10] Cached collections for tenant={tenant_id}")
+            except Exception as e:
+                logger.warning(f"[AC-AISVC-10] Cache set error: {e}")
+            
+            return tenant_collections
+        except Exception as e:
+            logger.error(f"[AC-AISVC-10] Failed to get collections for tenant={tenant_id}: {e}")
+            return [self.get_collection_name(tenant_id)]
+
+    def _build_qdrant_filter(
+        self,
+        metadata_filter: dict[str, Any],
+    ) -> Any:
+        """
+        构建 Qdrant 过滤条件。
+        
+        Args:
+            metadata_filter: 元数据过滤条件，如 {"grade": "三年级", "subject": "语文"}
+            
+        Returns:
+            Qdrant Filter 对象
+        """
+        from qdrant_client.models import FieldCondition, Filter, MatchValue
+        
+        must_conditions = []
+        
+        for key, value in metadata_filter.items():
+            # 支持嵌套 metadata 字段，如 metadata.grade
+            field_path = f"metadata.{key}"
+            condition = FieldCondition(
+                key=field_path,
+                match=MatchValue(value=value),
+            )
+            must_conditions.append(condition)
+        
+        return Filter(must=must_conditions) if must_conditions else None
+
     async def delete_collection(self, tenant_id: str) -> bool:
         """
         [AC-AISVC-10] Delete tenant's collection.

ai-service/app/main.py

@@ -29,6 +29,7 @@ from app.api.admin import (
     monitoring_router,
     prompt_templates_router,
     rag_router,
+    scene_slot_bundle_router,
     script_flows_router,
     sessions_router,
     slot_definition_router,
@@ -55,6 +56,11 @@ logging.basicConfig(
     format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
 )
 
+logging.getLogger("sqlalchemy.engine").setLevel(logging.WARNING)
+logging.getLogger("sqlalchemy.pool").setLevel(logging.WARNING)
+logging.getLogger("sqlalchemy.dialects").setLevel(logging.WARNING)
+logging.getLogger("sqlalchemy.orm").setLevel(logging.WARNING)
+
 logger = logging.getLogger(__name__)
 
 
@@ -88,6 +94,28 @@ async def lifespan(app: FastAPI):
     except Exception as e:
         logger.error(f"[AC-AISVC-50] API key initialization FAILED: {e}", exc_info=True)
 
+    try:
+        from app.services.mid.tool_guide_registry import init_tool_guide_registry
+
+        logger.info("[ToolGuideRegistry] Starting tool guides initialization...")
+        tool_guide_registry = init_tool_guide_registry()
+        logger.info(f"[ToolGuideRegistry] Tool guides loaded: {tool_guide_registry.list_tools()}")
+    except Exception as e:
+        logger.error(f"[ToolRegistry] Tools initialization FAILED: {e}", exc_info=True)
+
+    # [AC-AISVC-29] 预初始化 Embedding 服务，避免首次查询时的延迟
+    try:
+        from app.services.embedding import get_embedding_provider
+
+        logger.info("[AC-AISVC-29] Pre-initializing embedding service...")
+        embedding_provider = await get_embedding_provider()
+        logger.info(
+            f"[AC-AISVC-29] Embedding service pre-initialized: "
+            f"provider={embedding_provider.PROVIDER_NAME}"
+        )
+    except Exception as e:
+        logger.error(f"[AC-AISVC-29] Embedding service pre-initialization FAILED: {e}", exc_info=True)
+
     yield
 
     await close_db()
@@ -171,6 +199,7 @@ app.include_router(metadata_schema_router)
 app.include_router(monitoring_router)
 app.include_router(prompt_templates_router)
 app.include_router(rag_router)
+app.include_router(scene_slot_bundle_router)
 app.include_router(script_flows_router)
 app.include_router(sessions_router)
 app.include_router(slot_definition_router)

ai-service/app/models/entities.py

@@ -41,6 +41,7 @@ class ChatMessage(SQLModel, table=True):
     [AC-AISVC-13] Chat message entity with tenant isolation.
     Messages are scoped by (tenant_id, session_id) for multi-tenant security.
     [v0.7.0] Extended with monitoring fields for Dashboard statistics.
+    [v0.8.0] Extended with route_trace for hybrid routing observability.
     """
 
     __tablename__ = "chat_messages"
@@ -90,6 +91,11 @@ class ChatMessage(SQLModel, table=True):
         sa_column=Column("guardrail_words", JSON, nullable=True),
         description="[v0.7.0] Guardrail trigger details: words, categories, strategy"
     )
+    route_trace: dict[str, Any] | None = Field(
+        default=None,
+        sa_column=Column("route_trace", JSON, nullable=True),
+        description="[v0.8.0] Intent routing trace log for hybrid routing observability"
+    )
 
 
 class ChatSessionCreate(SQLModel):
@@ -227,6 +233,7 @@ class Document(SQLModel, table=True):
     file_type: str | None = Field(default=None, description="File MIME type")
     status: str = Field(default=DocumentStatus.PENDING.value, description="Document status")
     error_msg: str | None = Field(default=None, description="Error message if failed")
+    doc_metadata: dict | None = Field(default=None, sa_type=JSON, description="Document metadata as JSON")
     created_at: datetime = Field(default_factory=datetime.utcnow, description="Upload time")
     updated_at: datetime = Field(default_factory=datetime.utcnow, description="Last update time")
 
@@ -421,6 +428,7 @@ class IntentRule(SQLModel, table=True):
     [AC-AISVC-65] Intent rule entity with tenant isolation.
     Supports keyword and regex matching for intent recognition.
     [AC-IDSMETA-16] Extended with metadata field for unified storage structure.
+    [v0.8.0] Extended with intent_vector and semantic_examples for hybrid routing.
     """
 
     __tablename__ = "intent_rules"
@@ -458,6 +466,16 @@ class IntentRule(SQLModel, table=True):
         sa_column=Column("metadata", JSON, nullable=True),
         description="[AC-IDSMETA-16] Structured metadata for the intent rule"
     )
+    intent_vector: list[float] | None = Field(
+        default=None,
+        sa_column=Column("intent_vector", JSON, nullable=True),
+        description="[v0.8.0] Pre-computed intent vector for semantic matching"
+    )
+    semantic_examples: list[str] | None = Field(
+        default=None,
+        sa_column=Column("semantic_examples", JSON, nullable=True),
+        description="[v0.8.0] Semantic example sentences for dynamic vector computation"
+    )
     created_at: datetime = Field(default_factory=datetime.utcnow, description="Creation time")
     updated_at: datetime = Field(default_factory=datetime.utcnow, description="Last update time")
 
@@ -475,6 +493,8 @@ class IntentRuleCreate(SQLModel):
     fixed_reply: str | None = None
     transfer_message: str | None = None
     metadata_: dict[str, Any] | None = None
+    intent_vector: list[float] | None = None
+    semantic_examples: list[str] | None = None
 
 
 class IntentRuleUpdate(SQLModel):
@@ -491,6 +511,8 @@ class IntentRuleUpdate(SQLModel):
     transfer_message: str | None = None
     is_enabled: bool | None = None
     metadata_: dict[str, Any] | None = None
+    intent_vector: list[float] | None = None
+    semantic_examples: list[str] | None = None
 
 
 class IntentMatchResult:
@@ -810,6 +832,24 @@ class FlowStep(SQLModel):
         default=None,
         description="RAG configuration for this step: {'enabled': true, 'tag_filter': {'grade': '${context.grade}', 'type': '痛点'}}"
     )
+    allowed_kb_ids: list[str] | None = Field(
+        default=None,
+        description="[Step-KB-Binding] Allowed knowledge base IDs for this step. If set, KB search will be restricted to these KBs."
+    )
+    preferred_kb_ids: list[str] | None = Field(
+        default=None,
+        description="[Step-KB-Binding] Preferred knowledge base IDs for this step. These KBs will be searched first."
+    )
+    kb_query_hint: str | None = Field(
+        default=None,
+        description="[Step-KB-Binding] Query hint for KB search in this step, helps improve retrieval accuracy."
+    )
+    max_kb_calls_per_step: int | None = Field(
+        default=None,
+        ge=1,
+        le=5,
+        description="[Step-KB-Binding] Max KB calls allowed per step. Default is 1 if not set."
+    )
 
 
 class ScriptFlowCreate(SQLModel):
@@ -1078,6 +1118,7 @@ class MetadataFieldDefinition(SQLModel, table=True):
     )
     is_filterable: bool = Field(default=True, description="是否可用于过滤")
     is_rank_feature: bool = Field(default=False, description="是否用于排序特征")
+    usage_description: str | None = Field(default=None, description="用途说明")
     field_roles: list[str] = Field(
         default_factory=list,
         sa_column=Column("field_roles", JSON, nullable=False, server_default="'[]'"),
@@ -1104,6 +1145,7 @@ class MetadataFieldDefinitionCreate(SQLModel):
     scope: list[str] = Field(default_factory=lambda: [MetadataScope.KB_DOCUMENT.value])
     is_filterable: bool = Field(default=True)
     is_rank_feature: bool = Field(default=False)
+    usage_description: str | None = None
     field_roles: list[str] = Field(default_factory=list)
     status: str = Field(default=MetadataFieldStatus.DRAFT.value)
 
@@ -1118,6 +1160,7 @@ class MetadataFieldDefinitionUpdate(SQLModel):
     scope: list[str] | None = None
     is_filterable: bool | None = None
     is_rank_feature: bool | None = None
+    usage_description: str | None = None
     field_roles: list[str] | None = None
     status: str | None = None
 
@@ -1131,6 +1174,17 @@ class ExtractStrategy(str, Enum):
     USER_INPUT = "user_input"
 
 
+class ExtractFailureType(str, Enum):
+    """
+    [AC-MRS-07-UPGRADE] 提取失败类型
+    统一失败分类，用于追踪和日志
+    """
+    EXTRACT_EMPTY = "EXTRACT_EMPTY"              # 提取结果为空
+    EXTRACT_PARSE_FAIL = "EXTRACT_PARSE_FAIL"    # 解析失败
+    EXTRACT_VALIDATION_FAIL = "EXTRACT_VALIDATION_FAIL"  # 校验失败
+    EXTRACT_RUNTIME_ERROR = "EXTRACT_RUNTIME_ERROR"      # 运行时错误
+
+
 class SlotValueSource(str, Enum):
     """
     [AC-MRS-09] 槽位值来源
@@ -1145,6 +1199,7 @@ class SlotDefinition(SQLModel, table=True):
     """
     [AC-MRS-07,08] 槽位定义表
     独立的槽位定义模型，与元数据字段解耦但可复用
+    [AC-MRS-07-UPGRADE] 支持提取策略链 extract_strategies
     """
 
     __tablename__ = "slot_definitions"
@@ -1162,14 +1217,31 @@ class SlotDefinition(SQLModel, table=True):
         min_length=1,
         max_length=100,
     )
+    display_name: str | None = Field(
+        default=None,
+        description="槽位名称，给运营/教研看的中文名，例：grade -> '当前年级'",
+        max_length=100,
+    )
+    description: str | None = Field(
+        default=None,
+        description="槽位说明，解释这个槽位采集什么、用于哪里",
+        max_length=500,
+    )
     type: str = Field(
         default=MetadataFieldType.STRING.value,
         description="槽位类型: string/number/boolean/enum/array_enum"
     )
     required: bool = Field(default=False, description="是否必填槽位")
+    # [AC-MRS-07-UPGRADE] 保留旧字段用于兼容读取
     extract_strategy: str | None = Field(
         default=None,
-        description="提取策略: rule/llm/user_input"
+        description="[兼容字段] 提取策略: rule/llm/user_input，已废弃，请使用 extract_strategies"
+    )
+    # [AC-MRS-07-UPGRADE] 新增策略链字段
+    extract_strategies: list[str] | None = Field(
+        default=None,
+        sa_column=Column("extract_strategies", JSON, nullable=True),
+        description="[AC-MRS-07-UPGRADE] 提取策略链：有序数组，元素为 rule/llm/user_input，按顺序执行直到成功"
     )
     validation_rule: str | None = Field(
         default=None,
@@ -1192,14 +1264,72 @@ class SlotDefinition(SQLModel, table=True):
     created_at: datetime = Field(default_factory=datetime.utcnow, description="创建时间")
     updated_at: datetime = Field(default_factory=datetime.utcnow, description="更新时间")
 
+    def get_effective_strategies(self) -> list[str]:
+        """
+        [AC-MRS-07-UPGRADE] 获取有效的提取策略链
+        优先使用 extract_strategies，如果不存在则兼容读取 extract_strategy
+        """
+        if self.extract_strategies and len(self.extract_strategies) > 0:
+            return self.extract_strategies
+        if self.extract_strategy:
+            return [self.extract_strategy]
+        return []
+
+    def validate_strategies(self) -> tuple[bool, str]:
+        """
+        [AC-MRS-07-UPGRADE] 校验提取策略链的有效性
+
+        Returns:
+            Tuple of (是否有效, 错误信息)
+        """
+        valid_strategies = {"rule", "llm", "user_input"}
+        strategies = self.get_effective_strategies()
+
+        if not strategies:
+            return True, ""  # 空策略链视为有效（使用默认行为）
+
+        # 校验至少1个策略
+        if len(strategies) == 0:
+            return False, "提取策略链不能为空"
+
+        # 校验不允许重复策略
+        if len(strategies) != len(set(strategies)):
+            return False, "提取策略链中不允许重复的策略"
+
+        # 校验策略值有效
+        invalid = [s for s in strategies if s not in valid_strategies]
+        if invalid:
+            return False, f"无效的提取策略: {invalid}，有效值为: {list(valid_strategies)}"
+
+        return True, ""
+
 
 class SlotDefinitionCreate(SQLModel):
     """[AC-MRS-07,08] 创建槽位定义"""
 
     slot_key: str = Field(..., min_length=1, max_length=100)
+    display_name: str | None = Field(
+        default=None,
+        description="槽位名称，给运营/教研看的中文名",
+        max_length=100,
+    )
+    description: str | None = Field(
+        default=None,
+        description="槽位说明，解释这个槽位采集什么、用于哪里",
+        max_length=500,
+    )
     type: str = Field(default=MetadataFieldType.STRING.value)
     required: bool = Field(default=False)
-    extract_strategy: str | None = None
+    # [AC-MRS-07-UPGRADE] 支持策略链
+    extract_strategies: list[str] | None = Field(
+        default=None,
+        description="提取策略链：有序数组，元素为 rule/llm/user_input，按顺序执行直到成功"
+    )
+    # [AC-MRS-07-UPGRADE] 保留旧字段用于兼容
+    extract_strategy: str | None = Field(
+        default=None,
+        description="[兼容字段] 单提取策略，已废弃，请使用 extract_strategies"
+    )
     validation_rule: str | None = None
     ask_back_prompt: str | None = None
     default_value: dict[str, Any] | None = None
@@ -1209,9 +1339,28 @@ class SlotDefinitionCreate(SQLModel):
 class SlotDefinitionUpdate(SQLModel):
     """[AC-MRS-07] 更新槽位定义"""
 
+    display_name: str | None = Field(
+        default=None,
+        description="槽位名称，给运营/教研看的中文名",
+        max_length=100,
+    )
+    description: str | None = Field(
+        default=None,
+        description="槽位说明，解释这个槽位采集什么、用于哪里",
+        max_length=500,
+    )
     type: str | None = None
     required: bool | None = None
-    extract_strategy: str | None = None
+    # [AC-MRS-07-UPGRADE] 支持策略链
+    extract_strategies: list[str] | None = Field(
+        default=None,
+        description="提取策略链：有序数组，元素为 rule/llm/user_input，按顺序执行直到成功"
+    )
+    # [AC-MRS-07-UPGRADE] 保留旧字段用于兼容
+    extract_strategy: str | None = Field(
+        default=None,
+        description="[兼容字段] 单提取策略，已废弃，请使用 extract_strategies"
+    )
     validation_rule: str | None = None
     ask_back_prompt: str | None = None
     default_value: dict[str, Any] | None = None
@@ -1522,3 +1671,107 @@ class MidAuditLog(SQLModel, table=True):
     high_risk_scenario: str | None = Field(default=None, description="触发的高风险场景")
     latency_ms: int | None = Field(default=None, description="总耗时(ms)")
     created_at: datetime = Field(default_factory=datetime.utcnow, description="创建时间", index=True)
+
+
+class SceneSlotBundleStatus(str, Enum):
+    """[AC-SCENE-SLOT-01] 场景槽位包状态"""
+    DRAFT = "draft"
+    ACTIVE = "active"
+    DEPRECATED = "deprecated"
+
+
+class SceneSlotBundle(SQLModel, table=True):
+    """
+    [AC-SCENE-SLOT-01] 场景-槽位映射配置
+    定义每个场景需要采集的槽位集合
+
+    三层关系：
+    - 层1：slot ↔ metadata（通过 linked_field_id）
+    - 层2：scene ↔ slot_bundle（本模型）
+    - 层3：step.expected_variables ↔ slot_key（话术步骤引用）
+    """
+
+    __tablename__ = "scene_slot_bundles"
+    __table_args__ = (
+        Index("ix_scene_slot_bundles_tenant", "tenant_id"),
+        Index("ix_scene_slot_bundles_tenant_scene", "tenant_id", "scene_key", unique=True),
+        Index("ix_scene_slot_bundles_tenant_status", "tenant_id", "status"),
+    )
+
+    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
+    tenant_id: str = Field(..., description="Tenant ID for multi-tenant isolation", index=True)
+    scene_key: str = Field(
+        ...,
+        description="场景标识，如 'open_consult', 'refund_apply', 'course_recommend'",
+        min_length=1,
+        max_length=100,
+    )
+    scene_name: str = Field(
+        ...,
+        description="场景名称，如 '开放咨询', '退款申请', '课程推荐'",
+        min_length=1,
+        max_length=100,
+    )
+    description: str | None = Field(
+        default=None,
+        description="场景描述"
+    )
+    required_slots: list[str] = Field(
+        default_factory=list,
+        sa_column=Column("required_slots", JSON, nullable=False),
+        description="必填槽位 slot_key 列表"
+    )
+    optional_slots: list[str] = Field(
+        default_factory=list,
+        sa_column=Column("optional_slots", JSON, nullable=False),
+        description="可选槽位 slot_key 列表"
+    )
+    slot_priority: list[str] | None = Field(
+        default=None,
+        sa_column=Column("slot_priority", JSON, nullable=True),
+        description="槽位采集优先级顺序（slot_key 列表）"
+    )
+    completion_threshold: float = Field(
+        default=1.0,
+        ge=0.0,
+        le=1.0,
+        description="完成阈值（0.0-1.0），必填槽位填充比例达到此值视为完成"
+    )
+    ask_back_order: str = Field(
+        default="priority",
+        description="追问顺序策略: priority/required_first/parallel"
+    )
+    status: str = Field(
+        default=SceneSlotBundleStatus.DRAFT.value,
+        description="状态: draft/active/deprecated"
+    )
+    version: int = Field(default=1, description="版本号")
+    created_at: datetime = Field(default_factory=datetime.utcnow, description="创建时间")
+    updated_at: datetime = Field(default_factory=datetime.utcnow, description="更新时间")
+
+
+class SceneSlotBundleCreate(SQLModel):
+    """[AC-SCENE-SLOT-01] 创建场景槽位包"""
+
+    scene_key: str = Field(..., min_length=1, max_length=100)
+    scene_name: str = Field(..., min_length=1, max_length=100)
+    description: str | None = None
+    required_slots: list[str] = Field(default_factory=list)
+    optional_slots: list[str] = Field(default_factory=list)
+    slot_priority: list[str] | None = None
+    completion_threshold: float = Field(default=1.0, ge=0.0, le=1.0)
+    ask_back_order: str = Field(default="priority")
+    status: str = Field(default=SceneSlotBundleStatus.DRAFT.value)
+
+
+class SceneSlotBundleUpdate(SQLModel):
+    """[AC-SCENE-SLOT-01] 更新场景槽位包"""
+
+    scene_name: str | None = Field(default=None, min_length=1, max_length=100)
+    description: str | None = None
+    required_slots: list[str] | None = None
+    optional_slots: list[str] | None = None
+    slot_priority: list[str] | None = None
+    completion_threshold: float | None = Field(default=None, ge=0.0, le=1.0)
+    ask_back_order: str | None = None
+    status: str | None = None

ai-service/app/schemas/metadata.py

@@ -139,7 +139,16 @@ class SlotDefinitionResponse(BaseModel):
     slot_key: str = Field(..., description="槽位键名")
     type: str = Field(..., description="槽位类型")
     required: bool = Field(default=False, description="是否必填槽位")
-    extract_strategy: str | None = Field(default=None, description="提取策略")
+    # [AC-MRS-07-UPGRADE] 保留旧字段用于兼容
+    extract_strategy: str | None = Field(
+        default=None,
+        description="[兼容字段] 单提取策略，已废弃"
+    )
+    # [AC-MRS-07-UPGRADE] 新增策略链字段
+    extract_strategies: list[str] | None = Field(
+        default=None,
+        description="[AC-MRS-07-UPGRADE] 提取策略链：有序数组，元素为 rule/llm/user_input"
+    )
     validation_rule: str | None = Field(default=None, description="校验规则")
     ask_back_prompt: str | None = Field(default=None, description="追问提示语模板")
     default_value: dict[str, Any] | None = Field(default=None, description="默认值")
@@ -157,9 +166,15 @@ class SlotDefinitionCreateRequest(BaseModel):
     slot_key: str = Field(..., min_length=1, max_length=100, description="槽位键名")
     type: str = Field(default="string", description="槽位类型")
     required: bool = Field(default=False, description="是否必填槽位")
+    # [AC-MRS-07-UPGRADE] 支持策略链
+    extract_strategies: list[str] | None = Field(
+        default=None,
+        description="[AC-MRS-07-UPGRADE] 提取策略链：有序数组，元素为 rule/llm/user_input，按顺序执行直到成功"
+    )
+    # [AC-MRS-07-UPGRADE] 保留旧字段用于兼容
     extract_strategy: str | None = Field(
         default=None,
-        description="提取策略: rule/llm/user_input"
+        description="[兼容字段] 单提取策略，已废弃，请使用 extract_strategies"
     )
     validation_rule: str | None = Field(default=None, description="校验规则")
     ask_back_prompt: str | None = Field(default=None, description="追问提示语模板")
@@ -172,7 +187,16 @@ class SlotDefinitionUpdateRequest(BaseModel):
 
     type: str | None = None
     required: bool | None = None
-    extract_strategy: str | None = None
+    # [AC-MRS-07-UPGRADE] 支持策略链
+    extract_strategies: list[str] | None = Field(
+        default=None,
+        description="[AC-MRS-07-UPGRADE] 提取策略链：有序数组，元素为 rule/llm/user_input，按顺序执行直到成功"
+    )
+    # [AC-MRS-07-UPGRADE] 保留旧字段用于兼容
+    extract_strategy: str | None = Field(
+        default=None,
+        description="[兼容字段] 单提取策略，已废弃，请使用 extract_strategies"
+    )
     validation_rule: str | None = None
     ask_back_prompt: str | None = None
     default_value: dict[str, Any] | None = None

ai-service/app/services/api_key.py

@@ -81,7 +81,6 @@ class ApiKeyService:
             return
         except Exception as e:
             logger.warning(f"[AC-AISVC-50] Full API key schema load failed, fallback to legacy columns: {e}")
-            await session.rollback()
 
         # Backward-compat fallback for environments without new columns
         try:

ai-service/app/services/embedding/factory.py

@@ -12,6 +12,9 @@ import logging
 from pathlib import Path
 from typing import Any
 
+import redis
+
+from app.core.config import get_settings
 from app.services.embedding.base import EmbeddingException, EmbeddingProvider
 from app.services.embedding.nomic_provider import NomicEmbeddingProvider
 from app.services.embedding.ollama_provider import OllamaEmbeddingProvider
@@ -20,6 +23,7 @@ from app.services.embedding.openai_provider import OpenAIEmbeddingProvider
 logger = logging.getLogger(__name__)
 
 EMBEDDING_CONFIG_FILE = Path("config/embedding_config.json")
+EMBEDDING_CONFIG_REDIS_KEY = "ai_service:config:embedding"
 
 
 class EmbeddingProviderFactory:
@@ -170,8 +174,32 @@ class EmbeddingConfigManager:
         self._config = self._default_config.copy()
         self._provider: EmbeddingProvider | None = None
 
+        self._settings = get_settings()
+        self._redis_client: redis.Redis | None = None
+
+        self._load_from_redis()
         self._load_from_file()
 
+    def _load_from_redis(self) -> None:
+        """Load configuration from Redis if exists."""
+        try:
+            if not self._settings.redis_enabled:
+                return
+            self._redis_client = redis.from_url(
+                self._settings.redis_url,
+                encoding="utf-8",
+                decode_responses=True,
+            )
+            saved_raw = self._redis_client.get(EMBEDDING_CONFIG_REDIS_KEY)
+            if not saved_raw:
+                return
+            saved = json.loads(saved_raw)
+            self._provider_name = saved.get("provider", self._default_provider)
+            self._config = saved.get("config", self._default_config.copy())
+            logger.info(f"Loaded embedding config from Redis: provider={self._provider_name}")
+        except Exception as e:
+            logger.warning(f"Failed to load embedding config from Redis: {e}")
+
     def _load_from_file(self) -> None:
         """Load configuration from file if exists."""
         try:
@@ -184,6 +212,28 @@ class EmbeddingConfigManager:
         except Exception as e:
             logger.warning(f"Failed to load embedding config from file: {e}")
 
+    def _save_to_redis(self) -> None:
+        """Save configuration to Redis."""
+        try:
+            if not self._settings.redis_enabled:
+                return
+            if self._redis_client is None:
+                self._redis_client = redis.from_url(
+                    self._settings.redis_url,
+                    encoding="utf-8",
+                    decode_responses=True,
+                )
+            self._redis_client.set(
+                EMBEDDING_CONFIG_REDIS_KEY,
+                json.dumps({
+                    "provider": self._provider_name,
+                    "config": self._config,
+                }, ensure_ascii=False),
+            )
+            logger.info(f"Saved embedding config to Redis: provider={self._provider_name}")
+        except Exception as e:
+            logger.warning(f"Failed to save embedding config to Redis: {e}")
+
     def _save_to_file(self) -> None:
         """Save configuration to file."""
         try:
@@ -262,6 +312,7 @@ class EmbeddingConfigManager:
             self._config = config
             self._provider = new_provider_instance
 
+            self._save_to_redis()
             self._save_to_file()
 
             logger.info(f"Updated embedding config: provider={provider}")

ai-service/app/services/flow/engine.py

@@ -322,7 +322,7 @@ class FlowEngine:
         stmt = select(FlowInstance).where(
             FlowInstance.tenant_id == tenant_id,
             FlowInstance.session_id == session_id,
-        ).order_by(col(FlowInstance.created_at).desc())
+        ).order_by(col(FlowInstance.started_at).desc())
         result = await self._session.execute(stmt)
         instance = result.scalar_one_or_none()
 

ai-service/app/services/intent/rule_service.py

@@ -106,6 +106,8 @@ class IntentRuleService:
             is_enabled=True,
             hit_count=0,
             metadata_=create_data.metadata_,
+            intent_vector=create_data.intent_vector,
+            semantic_examples=create_data.semantic_examples,
         )
         self._session.add(rule)
         await self._session.flush()
@@ -195,6 +197,10 @@ class IntentRuleService:
             rule.is_enabled = update_data.is_enabled
         if update_data.metadata_ is not None:
             rule.metadata_ = update_data.metadata_
+        if update_data.intent_vector is not None:
+            rule.intent_vector = update_data.intent_vector
+        if update_data.semantic_examples is not None:
+            rule.semantic_examples = update_data.semantic_examples
 
         rule.updated_at = datetime.utcnow()
         await self._session.flush()
@@ -267,7 +273,7 @@ class IntentRuleService:
             select(IntentRule)
             .where(
                 IntentRule.tenant_id == tenant_id,
-                IntentRule.is_enabled == True,
+                IntentRule.is_enabled == True,  # noqa: E712
             )
             .order_by(col(IntentRule.priority).desc())
         )
@@ -300,6 +306,8 @@ class IntentRuleService:
             "is_enabled": rule.is_enabled,
             "hit_count": rule.hit_count,
             "metadata": rule.metadata_,
-            "created_at": rule.created_at.isoformat(),
+            "intent_vector": rule.intent_vector,
-            "updated_at": rule.updated_at.isoformat(),
+            "semantic_examples": rule.semantic_examples,
+            "created_at": rule.created_at.isoformat() if rule.created_at else None,
+            "updated_at": rule.updated_at.isoformat() if rule.updated_at else None,
         }

ai-service/app/services/kb.py

@@ -83,6 +83,7 @@ class KBService:
         file_name: str,
         file_content: bytes,
         file_type: str | None = None,
+        metadata: dict | None = None,
     ) -> tuple[Document, IndexJob]:
         """
         [AC-ASA-01] Upload document and create indexing job.
@@ -108,6 +109,7 @@ class KBService:
             file_size=len(file_content),
             file_type=file_type,
             status=DocumentStatus.PENDING.value,
+            doc_metadata=metadata,
         )
         self._session.add(document)
 

ai-service/app/services/llm/__init__.py

@@ -3,7 +3,14 @@ LLM Adapter module for AI Service.
 [AC-AISVC-02, AC-AISVC-06] Provides unified interface for LLM providers.
 """
 
-from app.services.llm.base import LLMClient, LLMConfig, LLMResponse, LLMStreamChunk
+from app.services.llm.base import (
+    LLMClient,
+    LLMConfig,
+    LLMResponse,
+    LLMStreamChunk,
+    ToolCall,
+    ToolDefinition,
+)
 from app.services.llm.openai_client import OpenAIClient
 
 __all__ = [
@@ -12,4 +19,6 @@ __all__ = [
     "LLMResponse",
     "LLMStreamChunk",
     "OpenAIClient",
+    "ToolCall",
+    "ToolDefinition",
 ]

ai-service/app/services/llm/base.py

@@ -28,17 +28,45 @@ class LLMConfig:
     extra_params: dict[str, Any] = field(default_factory=dict)
 
 
+@dataclass
+class ToolCall:
+    """
+    Represents a function call from the LLM.
+    Used in Function Calling mode.
+    """
+    id: str
+    name: str
+    arguments: dict[str, Any]
+    
+    def to_dict(self) -> dict[str, Any]:
+        import json
+        return {
+            "id": self.id,
+            "type": "function",
+            "function": {
+                "name": self.name,
+                "arguments": json.dumps(self.arguments, ensure_ascii=False),
+            }
+        }
+
+
 @dataclass
 class LLMResponse:
     """
     Response from LLM generation.
     [AC-AISVC-02] Contains generated content and metadata.
     """
-    content: str
+    content: str | None = None
-    model: str
+    model: str = ""
     usage: dict[str, int] = field(default_factory=dict)
     finish_reason: str = "stop"
+    tool_calls: list[ToolCall] = field(default_factory=list)
     metadata: dict[str, Any] = field(default_factory=dict)
+    
+    @property
+    def has_tool_calls(self) -> bool:
+        """Check if response contains tool calls."""
+        return len(self.tool_calls) > 0
 
 
 @dataclass
@@ -50,9 +78,33 @@ class LLMStreamChunk:
     delta: str
     model: str
     finish_reason: str | None = None
+    tool_calls_delta: list[dict[str, Any]] = field(default_factory=list)
     metadata: dict[str, Any] = field(default_factory=dict)
 
 
+@dataclass
+class ToolDefinition:
+    """
+    Tool definition for Function Calling.
+    Compatible with OpenAI/DeepSeek function calling format.
+    """
+    name: str
+    description: str
+    parameters: dict[str, Any]
+    type: str = "function"
+    
+    def to_openai_format(self) -> dict[str, Any]:
+        """Convert to OpenAI tools format."""
+        return {
+            "type": self.type,
+            "function": {
+                "name": self.name,
+                "description": self.description,
+                "parameters": self.parameters,
+            }
+        }
+
+
 class LLMClient(ABC):
     """
     Abstract base class for LLM clients.
@@ -67,6 +119,8 @@ class LLMClient(ABC):
         self,
         messages: list[dict[str, str]],
         config: LLMConfig | None = None,
+        tools: list[ToolDefinition] | None = None,
+        tool_choice: str | dict[str, Any] | None = None,
         **kwargs: Any,
     ) -> LLMResponse:
         """
@@ -76,10 +130,12 @@ class LLMClient(ABC):
         Args:
             messages: List of chat messages with 'role' and 'content'.
             config: Optional LLM configuration overrides.
+            tools: Optional list of tools for function calling.
+            tool_choice: Tool choice strategy ("auto", "none", or specific tool).
             **kwargs: Additional provider-specific parameters.
 
         Returns:
-            LLMResponse with generated content and metadata.
+            LLMResponse with generated content, tool_calls, and metadata.
 
         Raises:
             LLMException: If generation fails.
@@ -91,6 +147,8 @@ class LLMClient(ABC):
         self,
         messages: list[dict[str, str]],
         config: LLMConfig | None = None,
+        tools: list[ToolDefinition] | None = None,
+        tool_choice: str | dict[str, Any] | None = None,
         **kwargs: Any,
     ) -> AsyncGenerator[LLMStreamChunk, None]:
         """
@@ -100,6 +158,8 @@ class LLMClient(ABC):
         Args:
             messages: List of chat messages with 'role' and 'content'.
             config: Optional LLM configuration overrides.
+            tools: Optional list of tools for function calling.
+            tool_choice: Tool choice strategy ("auto", "none", or specific tool).
             **kwargs: Additional provider-specific parameters.
 
         Yields:

ai-service/app/services/llm/factory.py

@@ -11,12 +11,16 @@ from dataclasses import dataclass
 from pathlib import Path
 from typing import Any
 
+import redis
+
+from app.core.config import get_settings
 from app.services.llm.base import LLMClient, LLMConfig
 from app.services.llm.openai_client import OpenAIClient
 
 logger = logging.getLogger(__name__)
 
 LLM_CONFIG_FILE = Path("config/llm_config.json")
+LLM_CONFIG_REDIS_KEY = "ai_service:config:llm"
 
 
 @dataclass
@@ -286,6 +290,8 @@ class LLMConfigManager:
         from app.core.config import get_settings
 
         settings = get_settings()
+        self._settings = settings
+        self._redis_client: redis.Redis | None = None
 
         self._current_provider: str = settings.llm_provider
         self._current_config: dict[str, Any] = {
@@ -299,8 +305,75 @@ class LLMConfigManager:
         }
         self._client: LLMClient | None = None
 
+        self._load_from_redis()
         self._load_from_file()
 
+    def _load_from_redis(self) -> None:
+        """Load configuration from Redis if exists."""
+        try:
+            if not self._settings.redis_enabled:
+                return
+            self._redis_client = redis.from_url(
+                self._settings.redis_url,
+                encoding="utf-8",
+                decode_responses=True,
+            )
+            saved_raw = self._redis_client.get(LLM_CONFIG_REDIS_KEY)
+            if not saved_raw:
+                return
+            saved = json.loads(saved_raw)
+            self._current_provider = saved.get("provider", self._current_provider)
+            saved_config = saved.get("config", {})
+            if saved_config:
+                self._current_config.update(saved_config)
+            logger.info(f"[AC-ASA-16] Loaded LLM config from Redis: provider={self._current_provider}")
+        except Exception as e:
+            logger.warning(f"[AC-ASA-16] Failed to load LLM config from Redis: {e}")
+
+    def _save_to_redis(self) -> None:
+        """Save configuration to Redis."""
+        try:
+            if not self._settings.redis_enabled:
+                return
+            if self._redis_client is None:
+                self._redis_client = redis.from_url(
+                    self._settings.redis_url,
+                    encoding="utf-8",
+                    decode_responses=True,
+                )
+            self._redis_client.set(
+                LLM_CONFIG_REDIS_KEY,
+                json.dumps({
+                    "provider": self._current_provider,
+                    "config": self._current_config,
+                }, ensure_ascii=False),
+            )
+            logger.info(f"[AC-ASA-16] Saved LLM config to Redis: provider={self._current_provider}")
+        except Exception as e:
+            logger.warning(f"[AC-ASA-16] Failed to save LLM config to Redis: {e}")
+
+    def _load_from_redis(self) -> None:
+        """Load configuration from Redis if exists."""
+        try:
+            if not self._settings.redis_enabled:
+                return
+            self._redis_client = redis.from_url(
+                self._settings.redis_url,
+                encoding="utf-8",
+                decode_responses=True,
+            )
+            saved_raw = self._redis_client.get(LLM_CONFIG_REDIS_KEY)
+            if not saved_raw:
+                return
+            saved = json.loads(saved_raw)
+            self._current_provider = saved.get("provider", self._current_provider)
+            saved_config = saved.get("config", {})
+            if saved_config:
+                self._current_config.update(saved_config)
+            logger.info(f"[AC-ASA-16] Loaded LLM config from Redis: provider={self._current_provider}")
+        except Exception as e:
+            logger.warning(f"[AC-ASA-16] Failed to load LLM config from Redis: {e}")
+
     def _load_from_file(self) -> None:
         """Load configuration from file if exists."""
         try:
@@ -364,6 +437,7 @@ class LLMConfigManager:
         self._current_provider = provider
         self._current_config = validated_config
 
+        self._save_to_redis()
         self._save_to_file()
 
         logger.info(f"[AC-ASA-16] LLM config updated: provider={provider}")

ai-service/app/services/llm/openai_client.py

@@ -22,7 +22,14 @@ from tenacity import (
 
 from app.core.config import get_settings
 from app.core.exceptions import AIServiceException, ErrorCode, TimeoutException
-from app.services.llm.base import LLMClient, LLMConfig, LLMResponse, LLMStreamChunk
+from app.services.llm.base import (
+    LLMClient,
+    LLMConfig,
+    LLMResponse,
+    LLMStreamChunk,
+    ToolCall,
+    ToolDefinition,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -95,6 +102,8 @@ class OpenAIClient(LLMClient):
         messages: list[dict[str, str]],
         config: LLMConfig,
         stream: bool = False,
+        tools: list[ToolDefinition] | None = None,
+        tool_choice: str | dict[str, Any] | None = None,
         **kwargs: Any,
     ) -> dict[str, Any]:
         """Build request body for OpenAI API."""
@@ -106,6 +115,13 @@ class OpenAIClient(LLMClient):
             "top_p": config.top_p,
             "stream": stream,
         }
+        
+        if tools:
+            body["tools"] = [tool.to_openai_format() for tool in tools]
+        
+        if tool_choice:
+            body["tool_choice"] = tool_choice
+        
         body.update(config.extra_params)
         body.update(kwargs)
         return body
@@ -119,6 +135,8 @@ class OpenAIClient(LLMClient):
         self,
         messages: list[dict[str, str]],
         config: LLMConfig | None = None,
+        tools: list[ToolDefinition] | None = None,
+        tool_choice: str | dict[str, Any] | None = None,
         **kwargs: Any,
     ) -> LLMResponse:
         """
@@ -128,10 +146,12 @@ class OpenAIClient(LLMClient):
         Args:
             messages: List of chat messages with 'role' and 'content'.
             config: Optional LLM configuration overrides.
+            tools: Optional list of tools for function calling.
+            tool_choice: Tool choice strategy ("auto", "none", or specific tool).
             **kwargs: Additional provider-specific parameters.
 
         Returns:
-            LLMResponse with generated content and metadata.
+            LLMResponse with generated content, tool_calls, and metadata.
 
         Raises:
             LLMException: If generation fails.
@@ -140,9 +160,14 @@ class OpenAIClient(LLMClient):
         effective_config = config or self._default_config
         client = self._get_client(effective_config.timeout_seconds)
 
-        body = self._build_request_body(messages, effective_config, stream=False, **kwargs)
+        body = self._build_request_body(
+            messages, effective_config, stream=False, 
+            tools=tools, tool_choice=tool_choice, **kwargs
+        )
 
         logger.info(f"[AC-AISVC-02] Generating response with model={effective_config.model}")
+        if tools:
+            logger.info(f"[AC-AISVC-02] Function calling enabled with {len(tools)} tools")
         logger.info("[AC-AISVC-02] ========== FULL PROMPT TO AI ==========")
         for i, msg in enumerate(messages):
             role = msg.get("role", "unknown")
@@ -177,14 +202,18 @@ class OpenAIClient(LLMClient):
 
         try:
             choice = data["choices"][0]
-            content = choice["message"]["content"]
+            message = choice["message"]
+            content = message.get("content")
             usage = data.get("usage", {})
             finish_reason = choice.get("finish_reason", "stop")
+            
+            tool_calls = self._parse_tool_calls(message)
 
             logger.info(
                 f"[AC-AISVC-02] Generated response: "
                 f"tokens={usage.get('total_tokens', 'N/A')}, "
-                f"finish_reason={finish_reason}"
+                f"finish_reason={finish_reason}, "
+                f"tool_calls={len(tool_calls)}"
             )
 
             return LLMResponse(
@@ -192,6 +221,7 @@ class OpenAIClient(LLMClient):
                 model=data.get("model", effective_config.model),
                 usage=usage,
                 finish_reason=finish_reason,
+                tool_calls=tool_calls,
                 metadata={"raw_response": data},
             )
 
@@ -201,11 +231,34 @@ class OpenAIClient(LLMClient):
                 message=f"Unexpected LLM response format: {e}",
                 details=[{"response": str(data)}],
             )
+    
+    def _parse_tool_calls(self, message: dict[str, Any]) -> list[ToolCall]:
+        """Parse tool calls from LLM response message."""
+        tool_calls = []
+        raw_tool_calls = message.get("tool_calls", [])
+        
+        for tc in raw_tool_calls:
+            if tc.get("type") == "function":
+                func = tc.get("function", {})
+                try:
+                    arguments = json.loads(func.get("arguments", "{}"))
+                except json.JSONDecodeError:
+                    arguments = {}
+                
+                tool_calls.append(ToolCall(
+                    id=tc.get("id", ""),
+                    name=func.get("name", ""),
+                    arguments=arguments,
+                ))
+        
+        return tool_calls
 
     async def stream_generate(
         self,
         messages: list[dict[str, str]],
         config: LLMConfig | None = None,
+        tools: list[ToolDefinition] | None = None,
+        tool_choice: str | dict[str, Any] | None = None,
         **kwargs: Any,
     ) -> AsyncGenerator[LLMStreamChunk, None]:
         """
@@ -215,6 +268,8 @@ class OpenAIClient(LLMClient):
         Args:
             messages: List of chat messages with 'role' and 'content'.
             config: Optional LLM configuration overrides.
+            tools: Optional list of tools for function calling.
+            tool_choice: Tool choice strategy ("auto", "none", or specific tool).
             **kwargs: Additional provider-specific parameters.
 
         Yields:
@@ -227,9 +282,14 @@ class OpenAIClient(LLMClient):
         effective_config = config or self._default_config
         client = self._get_client(effective_config.timeout_seconds)
 
-        body = self._build_request_body(messages, effective_config, stream=True, **kwargs)
+        body = self._build_request_body(
+            messages, effective_config, stream=True,
+            tools=tools, tool_choice=tool_choice, **kwargs
+        )
 
         logger.info(f"[AC-AISVC-06] Starting streaming generation with model={effective_config.model}")
+        if tools:
+            logger.info(f"[AC-AISVC-06] Function calling enabled with {len(tools)} tools")
         logger.info("[AC-AISVC-06] ========== FULL PROMPT TO AI (STREAMING) ==========")
         for i, msg in enumerate(messages):
             role = msg.get("role", "unknown")

ai-service/app/services/metadata_field_definition_service.py

@@ -39,6 +39,19 @@ class MetadataFieldDefinitionService:
 
     def __init__(self, session: AsyncSession):
         self._session = session
+    
+    async def _invalidate_cache(self, tenant_id: str) -> None:
+        """
+        清除租户的元数据字段缓存
+        在字段创建、更新、删除时调用
+        """
+        try:
+            from app.services.metadata_cache_service import get_metadata_cache_service
+            cache_service = await get_metadata_cache_service()
+            await cache_service.invalidate(tenant_id)
+        except Exception as e:
+            # 缓存失效失败不影响主流程
+            logger.warning(f"[AC-IDSMETA-13] Failed to invalidate cache: {e}")
 
     async def list_field_definitions(
         self,
@@ -180,6 +193,9 @@ class MetadataFieldDefinitionService:
         self._session.add(field)
         await self._session.flush()
         
+        # 清除缓存，使新字段在下次查询时生效
+        await self._invalidate_cache(tenant_id)
+        
         logger.info(
             f"[AC-IDSMETA-13] [AC-MRS-01] Created field definition: tenant={tenant_id}, "
             f"field_key={field.field_key}, status={field.status}, field_roles={field.field_roles}"
@@ -223,6 +239,10 @@ class MetadataFieldDefinitionService:
             field.is_filterable = field_update.is_filterable
         if field_update.is_rank_feature is not None:
             field.is_rank_feature = field_update.is_rank_feature
+        # [AC-MRS-01] 修复：添加 field_roles 更新逻辑
+        if field_update.field_roles is not None:
+            self._validate_field_roles(field_update.field_roles)
+            field.field_roles = field_update.field_roles
         if field_update.status is not None:
             old_status = field.status
             field.status = field_update.status
@@ -235,6 +255,9 @@ class MetadataFieldDefinitionService:
         field.updated_at = datetime.utcnow()
         await self._session.flush()
         
+        # 清除缓存，使更新在下次查询时生效
+        await self._invalidate_cache(tenant_id)
+        
         logger.info(
             f"[AC-IDSMETA-14] Updated field definition: tenant={tenant_id}, "
             f"field_id={field_id}, version={field.version}"

ai-service/app/services/orchestrator.py

@@ -23,9 +23,9 @@ RAG Optimization (rag-optimization/spec.md):
 """
 
 import logging
-import uuid
 from collections.abc import AsyncGenerator
 from dataclasses import dataclass, field
+from datetime import datetime
 from typing import Any
 
 from sse_starlette.sse import ServerSentEvent
@@ -46,7 +46,6 @@ from app.services.flow.engine import FlowEngine
 from app.services.guardrail.behavior_service import BehaviorRuleService
 from app.services.guardrail.input_scanner import InputScanner
 from app.services.guardrail.output_filter import OutputFilter
-from app.services.guardrail.word_service import ForbiddenWordService
 from app.services.intent.router import IntentRouter
 from app.services.intent.rule_service import IntentRuleService
 from app.services.llm.base import LLMClient, LLMConfig, LLMResponse
@@ -90,6 +89,8 @@ class GenerationContext:
     10. confidence_result: Confidence calculation result
     11. messages_saved: Whether messages were saved
     12. final_response: Final ChatResponse
+
+    [v0.8.0] Extended with route_trace for hybrid routing observability.
     """
     tenant_id: str
     session_id: str
@@ -115,6 +116,11 @@ class GenerationContext:
     target_kb_ids: list[str] | None = None
     behavior_rules: list[str] = field(default_factory=list)
 
+    # [v0.8.0] Hybrid routing fields
+    route_trace: dict[str, Any] | None = None
+    fusion_confidence: float | None = None
+    fusion_decision_reason: str | None = None
+
     diagnostics: dict[str, Any] = field(default_factory=dict)
     execution_steps: list[dict[str, Any]] = field(default_factory=list)
 
@@ -487,7 +493,7 @@ class OrchestratorService:
                         finish_reason="flow_step",
                     )
                     ctx.diagnostics["flow_handled"] = True
-                    logger.info(f"[AC-AISVC-75] Flow provided reply, skipping LLM")
+                    logger.info("[AC-AISVC-75] Flow provided reply, skipping LLM")
 
             else:
                 ctx.diagnostics["flow_check_enabled"] = True
@@ -501,8 +507,8 @@ class OrchestratorService:
         """
         [AC-AISVC-69, AC-AISVC-70] Step 3: Match intent rules and route.
         Routes to: fixed reply, RAG with target KBs, flow start, or transfer.
+        [v0.8.0] Upgraded to use match_hybrid() for hybrid routing.
         """
-        # Skip if flow already handled the request
         if ctx.diagnostics.get("flow_handled"):
             logger.info("[AC-AISVC-69] Flow already handled, skipping intent matching")
             return
@@ -513,7 +519,6 @@ class OrchestratorService:
             return
 
         try:
-            # Load enabled rules ordered by priority
             async with get_session() as session:
                 from app.services.intent.rule_service import IntentRuleService
                 rule_service = IntentRuleService(session)
@@ -524,33 +529,64 @@ class OrchestratorService:
                 ctx.diagnostics["intent_matched"] = False
                 return
 
-            # Match intent
+            fusion_result = await self._intent_router.match_hybrid(
-            ctx.intent_match = self._intent_router.match(
                 message=ctx.current_message,
                 rules=rules,
+                tenant_id=ctx.tenant_id,
             )
 
-            if ctx.intent_match:
+            ctx.route_trace = fusion_result.trace.to_dict()
+            ctx.fusion_confidence = fusion_result.final_confidence
+            ctx.fusion_decision_reason = fusion_result.decision_reason
+
+            if fusion_result.final_intent:
+                ctx.intent_match = type(
+                    "IntentMatchResult",
+                    (),
+                    {
+                        "rule": fusion_result.final_intent,
+                        "match_type": fusion_result.decision_reason,
+                        "matched": "",
+                        "to_dict": lambda: {
+                            "rule_id": str(fusion_result.final_intent.id),
+                            "rule_name": fusion_result.final_intent.name,
+                            "match_type": fusion_result.decision_reason,
+                            "matched": "",
+                            "response_type": fusion_result.final_intent.response_type,
+                            "target_kb_ids": (
+                                fusion_result.final_intent.target_kb_ids or []
+                            ),
+                            "flow_id": (
+                                str(fusion_result.final_intent.flow_id)
+                                if fusion_result.final_intent.flow_id else None
+                            ),
+                            "fixed_reply": fusion_result.final_intent.fixed_reply,
+                            "transfer_message": fusion_result.final_intent.transfer_message,
+                        },
+                    },
+                )()
+
                 logger.info(
-                    f"[AC-AISVC-69] Intent matched: rule={ctx.intent_match.rule.name}, "
+                    f"[AC-AISVC-69] Intent matched: rule={fusion_result.final_intent.name}, "
-                    f"response_type={ctx.intent_match.rule.response_type}"
+                    f"response_type={fusion_result.final_intent.response_type}, "
+                    f"decision={fusion_result.decision_reason}, "
+                    f"confidence={fusion_result.final_confidence:.3f}"
                 )
 
                 ctx.diagnostics["intent_match"] = ctx.intent_match.to_dict()
+                ctx.diagnostics["fusion_result"] = fusion_result.to_dict()
 
-                # Increment hit count
                 async with get_session() as session:
                     rule_service = IntentRuleService(session)
                     await rule_service.increment_hit_count(
                         tenant_id=ctx.tenant_id,
-                        rule_id=ctx.intent_match.rule.id,
+                        rule_id=fusion_result.final_intent.id,
                     )
 
-                # Route based on response_type
+                rule = fusion_result.final_intent
-                if ctx.intent_match.rule.response_type == "fixed":
+                if rule.response_type == "fixed":
-                    # Fixed reply - skip LLM
                     ctx.llm_response = LLMResponse(
-                        content=ctx.intent_match.rule.fixed_reply or "收到您的消息。",
+                        content=rule.fixed_reply or "收到您的消息。",
                         model="intent_fixed",
                         usage={},
                         finish_reason="intent_fixed",
@@ -558,20 +594,18 @@ class OrchestratorService:
                     ctx.diagnostics["intent_handled"] = True
                     logger.info("[AC-AISVC-70] Intent fixed reply, skipping LLM")
 
-                elif ctx.intent_match.rule.response_type == "rag":
+                elif rule.response_type == "rag":
-                    # RAG with target KBs
+                    ctx.target_kb_ids = rule.target_kb_ids or []
-                    ctx.target_kb_ids = ctx.intent_match.rule.target_kb_ids or []
                     logger.info(f"[AC-AISVC-70] Intent RAG, target_kb_ids={ctx.target_kb_ids}")
 
-                elif ctx.intent_match.rule.response_type == "flow":
+                elif rule.response_type == "flow":
-                    # Start script flow
+                    if rule.flow_id and self._flow_engine:
-                    if ctx.intent_match.rule.flow_id and self._flow_engine:
                         async with get_session() as session:
                             flow_engine = FlowEngine(session)
                             instance, first_step = await flow_engine.start(
                                 tenant_id=ctx.tenant_id,
                                 session_id=ctx.session_id,
-                                flow_id=ctx.intent_match.rule.flow_id,
+                                flow_id=rule.flow_id,
                             )
                             if first_step:
                                 ctx.llm_response = LLMResponse(
@@ -583,10 +617,9 @@ class OrchestratorService:
                                 ctx.diagnostics["intent_handled"] = True
                                 logger.info("[AC-AISVC-70] Intent flow started, skipping LLM")
 
-                elif ctx.intent_match.rule.response_type == "transfer":
+                elif rule.response_type == "transfer":
-                    # Transfer to human
                     ctx.llm_response = LLMResponse(
-                        content=ctx.intent_match.rule.transfer_message or "正在为您转接人工客服...",
+                        content=rule.transfer_message or "正在为您转接人工客服...",
                         model="intent_transfer",
                         usage={},
                         finish_reason="intent_transfer",
@@ -600,9 +633,25 @@ class OrchestratorService:
                     ctx.diagnostics["intent_handled"] = True
                     logger.info("[AC-AISVC-70] Intent transfer, skipping LLM")
 
+                if fusion_result.need_clarify:
+                    ctx.diagnostics["need_clarify"] = True
+                    ctx.diagnostics["clarify_candidates"] = [
+                        {"id": str(r.id), "name": r.name}
+                        for r in (fusion_result.clarify_candidates or [])
+                    ]
+                    logger.info(
+                        f"[AC-AISVC-121] Low confidence, need clarify: "
+                        f"confidence={fusion_result.final_confidence:.3f}, "
+                        f"candidates={len(fusion_result.clarify_candidates or [])}"
+                    )
+
             else:
                 ctx.diagnostics["intent_match_enabled"] = True
                 ctx.diagnostics["intent_matched"] = False
+                ctx.diagnostics["fusion_result"] = fusion_result.to_dict()
+                logger.info(
+                    f"[AC-AISVC-69] No intent matched, decision={fusion_result.decision_reason}"
+                )
 
         except Exception as e:
             logger.warning(f"[AC-AISVC-69] Intent matching failed: {e}")
@@ -724,43 +773,43 @@ class OrchestratorService:
     async def _build_metadata_filters(self, ctx: GenerationContext):
         """
         [AC-IDSMETA-19] Build metadata filters from context.
-        
+
         Sources:
         1. Intent rule metadata (if matched)
         2. Session metadata
         3. Request metadata
         4. Extracted slots from conversation
-        
+
         Returns:
             TagFilter with at least grade, subject, scene if available
         """
         from app.services.retrieval.metadata import TagFilter
-        
+
         filter_fields = {}
-        
+
         # 1. From intent rule metadata
         if ctx.intent_match and hasattr(ctx.intent_match.rule, 'metadata_') and ctx.intent_match.rule.metadata_:
             intent_metadata = ctx.intent_match.rule.metadata_
             for key in ['grade', 'subject', 'scene']:
                 if key in intent_metadata:
                     filter_fields[key] = intent_metadata[key]
-        
+
         # 2. From session/request metadata
         if ctx.request_metadata:
             for key in ['grade', 'subject', 'scene']:
                 if key in ctx.request_metadata and key not in filter_fields:
                     filter_fields[key] = ctx.request_metadata[key]
-        
+
         # 3. From merged context (extracted slots)
         if ctx.merged_context and hasattr(ctx.merged_context, 'slots'):
             slots = ctx.merged_context.slots or {}
             for key in ['grade', 'subject', 'scene']:
                 if key in slots and key not in filter_fields:
                     filter_fields[key] = slots[key]
-        
+
         if not filter_fields:
             return None
-        
+
         return TagFilter(fields=filter_fields)
 
     async def _build_system_prompt(self, ctx: GenerationContext) -> None:
@@ -981,11 +1030,11 @@ class OrchestratorService:
                 "根据知识库信息，我找到了一些相关内容，"
                 "但暂时无法生成完整回复。建议您稍后重试或联系人工客服。"
             )
-        
+
         # [AC-IDSMETA-20] Record structured fallback reason code
         fallback_reason_code = self._determine_fallback_reason_code(ctx)
         ctx.diagnostics["fallback_reason_code"] = fallback_reason_code
-        
+
         logger.warning(
             f"[AC-IDSMETA-20] No recall, using fallback: "
             f"intent_id={ctx.intent_match.rule.id if ctx.intent_match else None}, "
@@ -993,7 +1042,7 @@ class OrchestratorService:
             f"applied_metadata_filters={ctx.diagnostics.get('retrieval', {}).get('applied_metadata_filters')}, "
             f"fallback_reason_code={fallback_reason_code}"
         )
-        
+
         return (
             "抱歉，我暂时无法处理您的请求。"
             "请稍后重试或联系人工客服获取帮助。"
@@ -1002,7 +1051,7 @@ class OrchestratorService:
     def _determine_fallback_reason_code(self, ctx: GenerationContext) -> str:
         """
         [AC-IDSMETA-20] Determine structured fallback reason code.
-        
+
         Reason codes:
         - no_recall_after_metadata_filter: No results after applying metadata filters
         - no_recall_no_kb: No target knowledge bases configured
@@ -1011,27 +1060,27 @@ class OrchestratorService:
         - no_recall_error: Retrieval error occurred
         """
         retrieval_diag = ctx.diagnostics.get("retrieval", {})
-        
+
         # Check for retrieval error
         if ctx.diagnostics.get("retrieval_error"):
             return "no_recall_error"
-        
+
         # Check if metadata filters were applied
         if retrieval_diag.get("applied_metadata_filters"):
             return "no_recall_after_metadata_filter"
-        
+
         # Check if target KBs were configured
         if not ctx.target_kb_ids:
             return "no_recall_no_kb"
-        
+
         # Check if KB is empty (no candidates at all)
         if retrieval_diag.get("total_candidates", 0) == 0:
             return "no_recall_kb_empty"
-        
+
         # Results found but filtered out by score threshold
         if retrieval_diag.get("total_candidates", 0) > 0 and retrieval_diag.get("filtered_hits", 0) == 0:
             return "no_recall_low_score"
-        
+
         return "no_recall_unknown"
 
     def _calculate_confidence(self, ctx: GenerationContext) -> None:
@@ -1122,6 +1171,7 @@ class OrchestratorService:
         [AC-AISVC-02] Build final ChatResponse from generation context.
         Step 12 of the 12-step pipeline.
         Uses filtered_reply from Step 9.
+        [v0.8.0] Includes route_trace in response metadata.
         """
         # Use filtered_reply if available, otherwise use llm_response.content
         if ctx.filtered_reply:
@@ -1142,6 +1192,10 @@ class OrchestratorService:
             "execution_steps": ctx.execution_steps,
         }
 
+        # [v0.8.0] Include route_trace in response metadata
+        if ctx.route_trace:
+            response_metadata["route_trace"] = ctx.route_trace
+
         return ChatResponse(
             reply=reply,
             confidence=confidence,

ai-service/app/services/prompt/template_service.py

@@ -178,6 +178,9 @@ class PromptTemplateService:
                 current_version = v
                 break
 
+        # Get latest version for current_content (not just published)
+        latest_version = versions[0] if versions else None
+
         return {
             "id": str(template.id),
             "name": template.name,
@@ -185,6 +188,8 @@ class PromptTemplateService:
             "description": template.description,
             "is_default": template.is_default,
             "metadata": template.metadata_,
+            "current_content": latest_version.system_instruction if latest_version else None,
+            "variables": latest_version.variables if latest_version else [],
             "current_version": {
                 "version": current_version.version,
                 "status": current_version.status,

ai-service/app/services/retrieval/base.py

@@ -28,6 +28,7 @@ class RetrievalContext:
     metadata: dict[str, Any] | None = None
     tag_filter: "TagFilter | None" = None
     kb_ids: list[str] | None = None
+    metadata_filter: dict[str, Any] | None = None
 
     def get_tag_filter_dict(self) -> dict[str, str | list[str] | None] | None:
         """获取标签过滤器的字典表示"""

ai-service/app/services/retrieval/vector_retriever.py

@@ -4,6 +4,7 @@ Vector retriever for AI Service.
 """
 
 import logging
+from typing import Any
 
 from app.core.config import get_settings
 from app.core.qdrant_client import QdrantClient, get_qdrant_client
@@ -76,16 +77,30 @@ class VectorRetriever(BaseRetriever):
             query_vector = await self._get_embedding(ctx.query)
             logger.info(f"[AC-AISVC-16] Embedding generated: dim={len(query_vector)}")
 
-            logger.info(f"[AC-AISVC-16] Searching in tenant collection: tenant_id={ctx.tenant_id}")
+            logger.info(f"[AC-AISVC-16] Searching in tenant collections: tenant_id={ctx.tenant_id}")
-            hits = await client.search(
+            if ctx.kb_ids:
-                tenant_id=ctx.tenant_id,
+                logger.info(f"[AC-AISVC-16] Restricting search to KB IDs: {ctx.kb_ids}")
-                query_vector=query_vector,
+                hits = await client.search(
-                limit=self._top_k,
+                    tenant_id=ctx.tenant_id,
-                score_threshold=self._score_threshold,
+                    query_vector=query_vector,
-            )
+                    limit=self._top_k,
-
+                    score_threshold=self._score_threshold,
-            logger.info(f"[AC-AISVC-16] Search returned {len(hits)} raw hits")
+                    vector_name="full",
+                    metadata_filter=ctx.metadata_filter,
+                    kb_ids=ctx.kb_ids,
+                )
+            else:
+                hits = await client.search(
+                    tenant_id=ctx.tenant_id,
+                    query_vector=query_vector,
+                    limit=self._top_k,
+                    score_threshold=self._score_threshold,
+                    vector_name="full",
+                    metadata_filter=ctx.metadata_filter,
+                )
 
+            logger.info(f"[AC-AISVC-16] Search returned {len(hits)} hits")
+            
             retrieval_hits = [
                 RetrievalHit(
                     text=hit.get("payload", {}).get("text", ""),
@@ -133,6 +148,47 @@ class VectorRetriever(BaseRetriever):
                 diagnostics={"error": str(e), "is_insufficient": True},
             )
 
+    def _apply_metadata_filter(
+        self,
+        hits: list[dict[str, Any]],
+        metadata_filter: dict[str, Any],
+    ) -> list[dict[str, Any]]:
+        """
+        应用元数据过滤条件。
+        
+        支持的操作:
+        - {"$eq": value} : 等于
+        - {"$in": [values]} : 在列表中
+        """
+        filtered = []
+        for hit in hits:
+            payload = hit.get("payload", {})
+            hit_metadata = payload.get("metadata", {})
+            
+            match = True
+            for field_key, condition in metadata_filter.items():
+                hit_value = hit_metadata.get(field_key)
+                
+                if isinstance(condition, dict):
+                    if "$eq" in condition:
+                        if hit_value != condition["$eq"]:
+                            match = False
+                            break
+                    elif "$in" in condition:
+                        if hit_value not in condition["$in"]:
+                            match = False
+                            break
+                else:
+                    # 直接值比较
+                    if hit_value != condition:
+                        match = False
+                        break
+            
+            if match:
+                filtered.append(hit)
+        
+        return filtered
+
     async def _get_embedding(self, text: str) -> list[float]:
         """
         Generate embedding for text using pluggable embedding provider.

ai-service/app/services/slot_definition_service.py

@@ -1,6 +1,7 @@
 """
 Slot Definition Service.
 [AC-MRS-07, AC-MRS-08] 槽位定义管理服务
+[AC-MRS-07-UPGRADE] 支持提取策略链 extract_strategies
 """
 
 import logging
@@ -27,6 +28,7 @@ logger = logging.getLogger(__name__)
 class SlotDefinitionService:
     """
     [AC-MRS-07, AC-MRS-08] 槽位定义服务
+    [AC-MRS-07-UPGRADE] 支持提取策略链管理
     
     管理独立的槽位定义模型，与元数据字段解耦但可复用
     """
@@ -114,6 +116,58 @@ class SlotDefinitionService:
         result = await self._session.execute(stmt)
         return result.scalar_one_or_none()
 
+    def _validate_strategies(self, strategies: list[str] | None) -> tuple[bool, str]:
+        """
+        [AC-MRS-07-UPGRADE] 校验提取策略链的有效性
+        
+        Args:
+            strategies: 策略链列表
+            
+        Returns:
+            Tuple of (是否有效, 错误信息)
+        """
+        if strategies is None:
+            return True, ""
+        
+        if not isinstance(strategies, list):
+            return False, "extract_strategies 必须是数组类型"
+        
+        if len(strategies) == 0:
+            return False, "提取策略链不能为空数组"
+        
+        # 校验不允许重复策略
+        if len(strategies) != len(set(strategies)):
+            return False, "提取策略链中不允许重复的策略"
+        
+        # 校验策略值有效
+        invalid = [s for s in strategies if s not in self.VALID_EXTRACT_STRATEGIES]
+        if invalid:
+            return False, f"无效的提取策略: {invalid}，有效值为: {self.VALID_EXTRACT_STRATEGIES}"
+        
+        return True, ""
+
+    def _normalize_strategies(
+        self,
+        extract_strategies: list[str] | None,
+        extract_strategy: str | None,
+    ) -> list[str] | None:
+        """
+        [AC-MRS-07-UPGRADE] 规范化提取策略
+        优先使用 extract_strategies，如果不存在则使用 extract_strategy
+        
+        Args:
+            extract_strategies: 策略链（新字段）
+            extract_strategy: 单策略（旧字段，兼容）
+            
+        Returns:
+            规范化后的策略链或 None
+        """
+        if extract_strategies is not None:
+            return extract_strategies
+        if extract_strategy:
+            return [extract_strategy]
+        return None
+
     async def create_slot_definition(
         self,
         tenant_id: str,
@@ -121,6 +175,7 @@ class SlotDefinitionService:
     ) -> SlotDefinition:
         """
         [AC-MRS-07, AC-MRS-08] 创建槽位定义
+        [AC-MRS-07-UPGRADE] 支持提取策略链
         
         Args:
             tenant_id: 租户 ID
@@ -148,11 +203,16 @@ class SlotDefinitionService:
                 f"有效类型为: {self.VALID_TYPES}"
             )
         
-        if slot_create.extract_strategy and slot_create.extract_strategy not in self.VALID_EXTRACT_STRATEGIES:
+        # [AC-MRS-07-UPGRADE] 规范化并校验提取策略链
-            raise ValueError(
+        strategies = self._normalize_strategies(
-                f"无效的提取策略 '{slot_create.extract_strategy}'，"
+            slot_create.extract_strategies,
-                f"有效策略为: {self.VALID_EXTRACT_STRATEGIES}"
+            slot_create.extract_strategy
-            )
+        )
+        
+        if strategies is not None:
+            is_valid, error_msg = self._validate_strategies(strategies)
+            if not is_valid:
+                raise ValueError(f"提取策略链校验失败: {error_msg}")
         
         linked_field = None
         if slot_create.linked_field_id:
@@ -162,12 +222,22 @@ class SlotDefinitionService:
                     f"[AC-MRS-08] 关联的元数据字段 '{slot_create.linked_field_id}' 不存在"
                 )
         
+        # [AC-MRS-07-UPGRADE] 确定要保存的旧字段值
+        # 如果前端提交了 extract_strategies，则使用第一个作为旧字段值
+        old_strategy = slot_create.extract_strategy
+        if not old_strategy and strategies and len(strategies) > 0:
+            old_strategy = strategies[0]
+        
         slot = SlotDefinition(
             tenant_id=tenant_id,
             slot_key=slot_create.slot_key,
+            display_name=slot_create.display_name,
+            description=slot_create.description,
             type=slot_create.type,
             required=slot_create.required,
-            extract_strategy=slot_create.extract_strategy,
+            # [AC-MRS-07-UPGRADE] 同时保存新旧字段
+            extract_strategy=old_strategy,
+            extract_strategies=strategies,
             validation_rule=slot_create.validation_rule,
             ask_back_prompt=slot_create.ask_back_prompt,
             default_value=slot_create.default_value,
@@ -180,6 +250,7 @@ class SlotDefinitionService:
         logger.info(
             f"[AC-MRS-07] Created slot definition: tenant={tenant_id}, "
             f"slot_key={slot.slot_key}, required={slot.required}, "
+            f"strategies={strategies}, "
             f"linked_field_id={slot.linked_field_id}"
         )
         
@@ -193,6 +264,7 @@ class SlotDefinitionService:
     ) -> SlotDefinition | None:
         """
         更新槽位定义
+        [AC-MRS-07-UPGRADE] 支持提取策略链更新
         
         Args:
             tenant_id: 租户 ID
@@ -206,6 +278,12 @@ class SlotDefinitionService:
         if not slot:
             return None
         
+        if slot_update.display_name is not None:
+            slot.display_name = slot_update.display_name
+        
+        if slot_update.description is not None:
+            slot.description = slot_update.description
+        
         if slot_update.type is not None:
             if slot_update.type not in self.VALID_TYPES:
                 raise ValueError(
@@ -217,13 +295,28 @@ class SlotDefinitionService:
         if slot_update.required is not None:
             slot.required = slot_update.required
         
-        if slot_update.extract_strategy is not None:
+        # [AC-MRS-07-UPGRADE] 处理提取策略链更新
-            if slot_update.extract_strategy not in self.VALID_EXTRACT_STRATEGIES:
+        # 如果传入了 extract_strategies 或 extract_strategy，则更新
-                raise ValueError(
+        if slot_update.extract_strategies is not None or slot_update.extract_strategy is not None:
-                    f"无效的提取策略 '{slot_update.extract_strategy}'，"
+            strategies = self._normalize_strategies(
-                    f"有效策略为: {self.VALID_EXTRACT_STRATEGIES}"
+                slot_update.extract_strategies,
-                )
+                slot_update.extract_strategy
-            slot.extract_strategy = slot_update.extract_strategy
+            )
+            
+            if strategies is not None:
+                is_valid, error_msg = self._validate_strategies(strategies)
+                if not is_valid:
+                    raise ValueError(f"提取策略链校验失败: {error_msg}")
+            
+            # [AC-MRS-07-UPGRADE] 同时更新新旧字段
+            slot.extract_strategies = strategies
+            # 如果前端提交了 extract_strategy，则使用它；否则使用策略链的第一个
+            if slot_update.extract_strategy is not None:
+                slot.extract_strategy = slot_update.extract_strategy
+            elif strategies and len(strategies) > 0:
+                slot.extract_strategy = strategies[0]
+            else:
+                slot.extract_strategy = None
         
         if slot_update.validation_rule is not None:
             slot.validation_rule = slot_update.validation_rule
@@ -250,7 +343,7 @@ class SlotDefinitionService:
         
         logger.info(
             f"[AC-MRS-07] Updated slot definition: tenant={tenant_id}, "
-            f"slot_id={slot_id}"
+            f"slot_id={slot_id}, strategies={slot.extract_strategies}"
         )
         
         return slot
@@ -331,9 +424,13 @@ class SlotDefinitionService:
             "id": str(slot.id),
             "tenant_id": slot.tenant_id,
             "slot_key": slot.slot_key,
+            "display_name": slot.display_name,
+            "description": slot.description,
             "type": slot.type,
             "required": slot.required,
+            # [AC-MRS-07-UPGRADE] 返回新旧字段
             "extract_strategy": slot.extract_strategy,
+            "extract_strategies": slot.extract_strategies,
             "validation_rule": slot.validation_rule,
             "ask_back_prompt": slot.ask_back_prompt,
             "default_value": slot.default_value,