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Resolve "Make `finalize_batched_background_migration` to work properly with many DBs "

Diogo Frazão requested to merge 362268-the-batched-migrations-should-enforce-requirements-3 into master

Context

When we run db:migrate:[database], activerecord points the ActiveRecord::Base.connection to the database passed in context.

Example:

If we run db:migrate:ci, activerecord will point ActiveRecord::Base to the :ci database.

This breaks the usage of the finalize_batched_background_migration method for CI.

To fix this, we are using with_restored_connection_stack that completely rewrites the connection stack.

Related to #362268 (closed) #358430 (closed)

Edited by Kamil Trzciński

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