ActiveRecord::QueryCanceled: PG::QueryCanceled: ERROR: canceling statement due to statement timeout

https://sentry.gitlab.net/gitlab/gitlabcom/issues/963781/

PG::QueryCanceled: ERROR:  canceling statement due to statement timeout

  active_record/connection_adapters/postgresql_adapter.rb:611:in `async_exec_params'
    @connection.exec_params(sql, type_casted_binds)
  active_record/connection_adapters/postgresql_adapter.rb:611:in `block (2 levels) in exec_no_cache'
    @connection.exec_params(sql, type_casted_binds)
  active_support/dependencies/interlock.rb:48:in `block in permit_concurrent_loads'
    yield
  active_support/concurrency/share_lock.rb:187:in `yield_shares'
    yield
  active_support/dependencies/interlock.rb:47:in `permit_concurrent_loads'
    @lock.yield_shares(compatible: [:load]) do
...
(171 additional frame(s) were not displayed)

ActiveRecord::QueryCanceled: PG::QueryCanceled: ERROR:  canceling statement due to statement timeout
: SELECT "merge_request_diff_files".* FROM "merge_request_diff_files" WHERE "merge_request_diff_files"."merge_request_diff_id" = 55854132 ORDER BY "merge_request_diff_files"."merge_request_diff_id" ASC, "merge_request_diff_files"."relative_order" ASC

ActiveRecord::QueryCanceled: PG::QueryCanceled: ERROR:  canceling statement due to statement timeout
: SELECT "merge_request_diff_files".* FROM "merge_request_diff_files" WHERE "merge_request_diff_files"."merge_request_diff_id" = 55854132 ORDER BY "merge_request_diff_files"."merge_request_diff_id" ASC, "merge_request_diff_files"."relative_order" ASC