# 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.
# Which Problems Are Solved
setup step 41 cannot handle downgrades at the moment. This step writes
the instance domain to the fields table. If there are new instances
created during the downgraded version is running there would be domain
missing in the fields afterwards.
# How the Problems Are Solved
Make step 41 repeatable for each version
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