Redis Helpers

Connection

Function	Parameters	Returns
`redis_connect(url, database, username, password)`	`url`: Redis URL (e.g. `"redis://localhost:6379"`), `database` (optional): 0-15 (default 0), `username` (optional): ACL username, `password` (optional): auth password	`(success, error)` — boolean + string\|nil
`redis_disconnect()`	none	`(success, error)` — boolean + string\|nil

Connection persists across all hooks. Call redis_connect() once in on_start(). Timeout: 500ms.

Function	Parameters	Returns
`redis_get(key)`	`key`: string (required, non-empty)	`(value, error)` — string\|nil + string\|nil. 100ms timeout
`redis_set(key, value, ttl_seconds)`	`key`: string, `value`: string, `ttl_seconds` (optional): number (`nil` for no expiry)	`(success, error)` — boolean + string\|nil. 100ms timeout
`redis_set_async(key, value, ttl_seconds)`	Same as `redis_set`	`true` if queued, `false` if not connected/invalid key. 1000ms timeout
`redis_del(key)`	`key`: string (required, non-empty)	`(deleted_count, error)` — number (0 or 1) + string\|nil. 1000ms timeout
`redis_del_async(key)`	`key`: string (required, non-empty)	`true` if queued, `false` if not connected/invalid key. 100ms timeout
`redis_exists(key)`	`key`: string (required, non-empty)	`(exists, error)` — boolean + string\|nil. 100ms timeout