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Allow Atomic engine for nested MaterializeMySQL database

Official CH changelog text
Allow using Atomic engine for nested database of MaterializeMySQL engine. #14849 (tavplubix).
Enabled the use of the Atomic table engine for nested databases within the MaterializeMySQL engine.

Why it matters

This feature allows better transactional support and crash safety for tables inside the nested database of the MaterializeMySQL engine, improving data consistency and durability during replication from MySQL.

How to use it

When configuring the MaterializeMySQL engine, specify the nested database to use the Atomic engine for its tables. This enhances reliability without additional user intervention.

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