fix: 后台加人人数改为事务内实际插入数

internal/admin/groups.go

@@ -316,13 +316,6 @@ func (h *Handler) handleGroupAddMembers(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	before, err := h.groupMemberCount(r.Context(), id)
-	if err != nil {
-		h.auditP(p, "group_add_members", id, "error", ip)
-		httpx.WriteError(w, http.StatusInternalServerError, "internal", "内部错误")
-		return
-	}
-
 	res, err := h.groups.AdminAddMembers(r.Context(), id, req.MemberIDs)
 	if err != nil {
 		h.writeGroupErr(w, p, "group_add_members", id, ip, err)
@@ -332,14 +325,7 @@ func (h *Handler) handleGroupAddMembers(w http.ResponseWriter, r *http.Request)
 	if failed == nil {
 		failed = []group.MemberFail{}
 	}
-
-	after, err := h.groupMemberCount(r.Context(), id)
-	if err != nil {
-		h.auditP(p, "group_add_members", id, "error", ip)
-		httpx.WriteError(w, http.StatusInternalServerError, "internal", "内部错误")
-		return
-	}
-	added := after - before
+	added := res.Added
 	if added < 0 {
 		added = 0
 	}
@@ -434,13 +420,6 @@ func (h *Handler) groupOwner(ctx context.Context, groupID string) (string, error
 	return owner, err
 }
 
-func (h *Handler) groupMemberCount(ctx context.Context, groupID string) (int, error) {
-	var n int
-	err := h.db.Read.QueryRowContext(ctx,
-		`SELECT COUNT(*) FROM group_members WHERE group_id = ?`, groupID).Scan(&n)
-	return n, err
-}
-
 func (h *Handler) groupSummary(ctx context.Context, groupID string) (map[string]any, error) {
 	var name, owner string
 	var created int64