FLUSHDBDelete every key of the current database (kevy is single-DB: same as FLUSHALL).
| 语法 | FLUSHDB |
| 分组 | server |
| 参数个数 | -1 |
| 起始版本 | 1.0.0 |
| 标志 | write |
| 复杂度 | O(N + S) — identical to FLUSHALL |
| Redis 兼容性 | differs: kevy is single-DB, so FLUSHDB is an alias of FLUSHALL; ASYNC / SYNC are ignored |