feat: 增强知识库功能，优化索引和RAG检索

server/src/app/services/knowledge.py

@@ -856,7 +856,13 @@ class KnowledgeService:
 
             status_payload = status_map.get(document_id) or {}
             rag_status = str(status_payload.get("status") or "").strip().lower()
-            if bool(status_payload.get("query_ready")):
+            linked_run_status = self._resolve_linked_ingest_run_status(entry)
+            if (
+                linked_run_status == AgentRunStatus.FAILED.value
+                and rag_status in {"pending", "processing", "preprocessed"}
+            ):
+                desired_status = KNOWLEDGE_INGEST_STATUS_FAILED
+            elif bool(status_payload.get("query_ready")):
                 desired_status = KNOWLEDGE_INGEST_STATUS_INGESTED
             elif rag_status in {"pending", "processing", "preprocessed"}:
                 desired_status = KNOWLEDGE_INGEST_STATUS_SYNCING
@@ -1007,12 +1013,22 @@ class KnowledgeService:
             probe_entry = {"ingest_status_updated_at": heartbeat_at}
             return not self._is_syncing_status_stale(probe_entry)
 
-        return not self._is_syncing_status_stale(entry)
-
-    def _require_entry(self, index: dict[str, Any], document_id: str) -> dict[str, Any]:
-        for entry in index["documents"]:
-            if entry["id"] == document_id:
-                return entry
+        return not self._is_syncing_status_stale(entry)
+
+    def _resolve_linked_ingest_run_status(self, entry: dict[str, Any]) -> str:
+        agent_run_id = str(entry.get("ingest_agent_run_id") or "").strip()
+        if not agent_run_id or self.db is None:
+            return ""
+
+        run = self.db.scalar(select(AgentRun).where(AgentRun.run_id == agent_run_id))
+        if run is None:
+            return ""
+        return str(run.status or "").strip()
+
+    def _require_entry(self, index: dict[str, Any], document_id: str) -> dict[str, Any]:
+        for entry in index["documents"]:
+            if entry["id"] == document_id:
+                return entry
         raise FileNotFoundError(document_id)
 
     def _resolve_document_path(self, entry: dict[str, Any]) -> Path: