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- Rev 37708 2026-09-18 04:26:13
- Author: amit
- Log message:
- Migration: state the algorithm and lock mode, and why it runs before the release
hadb1 is MySQL 5.7, so adding a column rebuilds the table rather than only touching metadata.
At ~53k rows that is seconds and InnoDB permits concurrent reads and writes throughout, but
ALGORITHM/LOCK are now stated explicitly so it fails loudly rather than quietly taking a table
lock if that ever stops holding.