Redis client is not initialized in Rate Limiter utils

[scottyeung]

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async def is_rate_limited(db: AsyncSession, user_id: int, path: str, limit: int, period: int) -> bool:
    if client is None:
        logger.error("Redis client is not initialized.")
        raise Exception("Redis client is not initialized.")

Description Redis client was recognised as none when I tried to create background tasks in Swagger and caught exception in is_rate_limited

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