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c36be9b207
# Which Problems Are Solved
get instance by domain cannot provide an instance id because it is not
known at that time. This causes a full table scan on the fields table
because current indexes always include the `instance_id` column.
# How the Problems Are Solved
Added a specific index for this query.
# Additional Context
If a system has many fields and there is no cache hit for the given
domain this query can heaviuly influence database CPU usage, the newly
added resolves this problem.
(cherry picked from commit f320d18b1a)