diff --git a/go/internal/api/server.go b/go/internal/api/server.go
index 5797efd..6109241 100644
--- a/go/internal/api/server.go
+++ b/go/internal/api/server.go
@@ -864,40 +864,54 @@ func NewServer() http.Handler {
 		ignored := 0
 		errors_ := 0
 
+		// 按目标分组整合：外层 i 为目标，内层收集所有高相似候选，
+		// 每个目标只调一次 LLM（UpdatePrompt 原生支持多候选），避免 O(n²) LLM 调用风暴。
+		// 2026-09-06 fix(t_04 ④): 原实现每对相似记忆调一次 LLM → limit=100 产生 4950 对
+		// → 跑 223s+ 未完成 → 每天 processed=0（不是 namespace 过滤 bug）。
 		for i := 0; i < len(mems); i++ {
+			// 收集所有与 mems[i] 高相似的候选（j > i 且未处理）
+			var cands []distill.MemoryCandidate
 			for j := i + 1; j < len(mems); j++ {
+				if mems[j].Content == "" {
+					continue
+				}
 				sim := distill.TextSimilarity(mems[i].Content, mems[j].Content)
 				if sim < 0.5 {
 					continue
 				}
-				// 高相似 → LLM 决策（以 j 为目标，i 为候选）
-				result, err := routes.DistillEngineRef.ConsolidateMemory(
-					distill.MemoryCandidate{ID: mems[j].ID, Content: mems[j].Content},
-					[]distill.MemoryCandidate{{ID: mems[i].ID, Content: mems[i].Content}},
-				)
-				if err != nil {
-					errors_++
-					continue
-				}
-				processed++
-				switch result.Action {
-				case "update":
-					if result.NewMemory != "" {
-						if err := ldb.UpdateMemoryContent(mems[j].ID, result.NewMemory, "consolidate"); err != nil {
-							log.Printf("[consolidate] update failed %s: %v", mems[j].ID, err)
-						} else {
-							updated++
-						}
-					}
-				case "delete":
-					if err := ldb.SoftDelete(mems[j].ID, "consolidate: conflict"); err != nil {
-						log.Printf("[consolidate] delete failed %s: %v", mems[j].ID, err)
+				cands = append(cands, distill.MemoryCandidate{ID: mems[j].ID, Content: mems[j].Content})
+			}
+			if len(cands) == 0 {
+				continue
+			}
+
+			// 一次 LLM 决策：目标 mems[i] + 全部高相似候选
+			result, err := routes.DistillEngineRef.ConsolidateMemory(
+				distill.MemoryCandidate{ID: mems[i].ID, Content: mems[i].Content},
+				cands,
+			)
+			if err != nil {
+				errors_++
+				continue
+			}
+			processed++
+			switch result.Action {
+			case "update":
+				if result.NewMemory != "" {
+					if err := ldb.UpdateMemoryContent(mems[i].ID, result.NewMemory, "consolidate"); err != nil {
+						log.Printf("[consolidate] update failed %s: %v", mems[i].ID, err)
 					} else {
-						deleted++
+						updated++
 					}
-				default:
-					ignored++
 				}
+			case "delete":
+				if err := ldb.SoftDelete(mems[i].ID, "consolidate: conflict"); err != nil {
+					log.Printf("[consolidate] delete failed %s: %v", mems[i].ID, err)
+				} else {
+					deleted++
+				}
+			default:
+				ignored++
 			}
 		}