diff --git a/go/internal/api/server.go b/go/internal/api/server.go
index eed0e6e..70f0e5e 100644
--- a/go/internal/api/server.go
+++ b/go/internal/api/server.go
@@ -99,13 +99,13 @@ func NewServer() http.Handler {
 		graphPath = "/var/lib/memoryweave/graph.db"
 	}
 	var graphStore governance.GraphStore
-	gs, err := governance.NewFileGraph(graphPath)
+	gs, err := governance.NewSQLiteGraphStore(graphPath)
 	if err != nil {
-		log.Printf("[zhiyid] WARN: FileGraph 初始化失败 (%v)，降级为 InMemoryGraph", err)
+		log.Printf("[zhiyid] WARN: SQLite 图谱初始化失败 (%v)，降级为 InMemoryGraph", err)
 		graphStore = governance.NewInMemoryGraph()
 	} else {
 		graphStore = gs
-		log.Printf("[zhiyid] 图谱后端: FileGraph — %s", graphPath)
+		log.Printf("[zhiyid] 图谱后端: SQLiteGraphStore — %s", graphPath)
 	}
 	graphUpdater := governance.NewAutoGraphUpdater(graphStore)
 	graphAPI := routes.NewGraphAPI(graphStore)
diff --git a/go/internal/governance/graph_sqlite.go b/go/internal/governance/graph_sqlite.go
index c92ba32..06049a7 100644
--- a/go/internal/governance/graph_sqlite.go
+++ b/go/internal/governance/graph_sqlite.go
@@ -818,6 +818,11 @@ func (gs *SQLiteGraphStore) EvidenceCount(entity string) int {
 	return sum
 }
 
+// GetEntityDegree E4.3: 返回实体的图谱度（入度+出度），度越高越优先保留
+func (gs *SQLiteGraphStore) GetEntityDegree(entity string) int {
+	return gs.EvidenceCount(entity)
+}
+
 // ─── CGO 工具 ──────────────────────────────────────────
 
 // UpdatePageRanks 批量更新节点的 pagerank 值（§2.5.5）