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

https://sentry.gitlab.net/gitlab/gitlabcom/issues/773647/

PG::QueryCanceled: ERROR:  canceling statement due to statement timeout
CONTEXT:  while updating tuple (1327483,12) in relation "merge_requests"

  /opt/gitlab/embedded/service/gitlab-rails/config/initializers/peek.rb:18:in `async_exec_params'
    super(*args)
  /opt/gitlab/embedded/service/gitlab-rails/config/initializers/peek.rb:18:in `exec_params'
    super(*args)
  active_record/connection_adapters/postgresql_adapter.rb:624:in `block (2 levels) in exec_no_cache'
    @connection.exec_params(sql, type_casted_binds)
  active_support/dependencies/interlock.rb:46:in `block in permit_concurrent_loads'
    yield
  active_support/concurrency/share_lock.rb:185:in `yield_shares'
    yield
...
(241 additional frame(s) were not displayed)

ActiveRecord::StatementInvalid: PG::QueryCanceled: ERROR:  canceling statement due to statement timeout
CONTEXT:  while updating tuple (1327483,12) in relation "merge_requests"
: UPDATE "merge_requests" SET "merge_status" = 'cannot_be_merged' WHERE "merge_requests"."id" = 27784186

ActiveRecord::StatementInvalid: PG::QueryCanceled: ERROR:  canceling statement due to statement timeout
CONTEXT:  while updating tuple (1327483,12) in relation "merge_requests"
: UPDATE "merge_requests" SET "merge_status" = 'cannot_be_merged' WHERE "merge_requests"."id" = 27784186

Kibana: https://log.gitlab.net/goto/d59bbf2f16dd1f124bc714d6589c334a