the SQL query. The ActorMigration class may also be used to get feature-flagged
information needed to access actor-related fields during the migration
period.
+* Added Wikimedia\Rdbms\IDatabase::cancelAtomic(), to roll back an atomic
+ section without having to roll back the whole transaction.
+* Wikimedia\Rdbms\IDatabase::doAtomicSection(), non-native ::insertSelect(),
+ and non-MySQL ::replace() and ::upsert() no longer roll back the whole
+ transaction on failure.
=== External library changes in 1.31 ===