[ // 只限制冷查询和后台刷新;本地快照命中不占槽位。 'max_concurrency' => (int) env('UPSTREAM_MAX_CONCURRENCY', 4), 'slot_wait_ms' => (int) env('UPSTREAM_SLOT_WAIT_MS', 1500), ], 'sources' => [ 'jiansun' => [ 'label' => 'JianSun 旧业务库', 'config' => 'jiansun', ], 'operations_replica' => [ 'label' => '经营分析副本库', 'config' => 'operations_replica', ], ], ];