Security cameras use an Ambient Light Sensor (ALS) to decide whether to switch into night mode. In production, a background polling thread continuously reads the sensor and sends readings to a wrapper. Other threads should be able to query the wrapper safely without waiting for the sensor.

Each reading has a status, lux, and timestamp.

• status == 1: the reading is valid. Record this (timestamp, lux) reading.
• status == 0: the sensor reports no change. Ignore this reading completely.

You need to implement the ALSWrapper class with thread-safe, non-blocking query support. In real production, the wrapper may receive frequent records from one or more sensors while other threads are querying it at the same time.