The real-time database charges an independent fee on a daily basis, prioritizing the deduction of the plan's included usage. Once the plan is exhausted, the fee will be deducted from the ifanr Cloud account balance. If the balance is insufficient to cover the charges, the connection will be terminated. The calculation granularity is based on (units) per day; if the amount is not a whole number, it will be rounded up. (For example, if the number of real-time database subscriptions for the day is 345, it will be rounded up to 400; if the message count is 1688, it will be rounded up to 2000)