UNLINKDelete one or more keys (alias of DEL in kevy's shard model).
| 语法 | UNLINK key [key ...] |
| 分组 | generic |
| 参数个数 | -2 |
| 起始版本 | 1.0.0 |
| 标志 | write |
| 复杂度 | O(N) keys, plus O(M) per collection-typed key — identical to DEL |
| Redis 兼容性 | differs: UNLINK is an alias of DEL — the value is freed inline on the owning shard's reactor thread, not by a background thread, so it gives no latency benefit |