Suspision: dynflow tries to migrate the tables when it boots up. Maybe dynflow tries to migrate the db several times at once from different puma workers

Examples:

• CentOS 7:
  

  /opt/theforeman/tfm/root/usr/share/gems/gems/sequel-5.7.1/lib/sequel/adapters/postgres.rb:146:in `async_exec': PG::UniqueViolation: ERROR:  duplicate key value violates unique constraint "pg_type_typname_nsp_index" (Sequel::UniqueConstraintViolation)
  DETAIL:  Key (typname, typnamespace)=(dynflow_schema_info, 2200) already exists.
  

• Ubuntu 18.04:
  

  dynflow-sidekiq@orchestrator[8451]: More than 1 row in migrator table
  dynflow-sidekiq@orchestrator[8451]: /usr/share/foreman/vendor/ruby/2.5.0/gems/sequel-5.30.0/lib/sequel/extensions/migration.rb:620:in `schema_dataset'
  dynflow-sidekiq@orchestrator[8451]: /usr/share/foreman/vendor/ruby/2.5.0/gems/sequel-5.30.0/lib/sequel/extensions/migration.rb:455:in `initialize'
  dynflow-sidekiq@orchestrator[8451]: /usr/share/foreman/vendor/ruby/2.5.0/gems/sequel-5.30.0/lib/sequel/extensions/migration.rb:519:in `initialize'
  dynflow-sidekiq@orchestrator[8451]: /usr/share/foreman/vendor/ruby/2.5.0/gems/sequel-5.30.0/lib/sequel/extensions/migration.rb:402:in `new'
  dynflow-sidekiq@orchestrator[8451]: /usr/share/foreman/vendor/ruby/2.5.0/gems/sequel-5.30.0/lib/sequel/extensions/migration.rb:402:in `run'
  dynflow-sidekiq@orchestrator[8451]: /usr/share/foreman/vendor/ruby/2.5.0/gems/dynflow-1.4.3/lib/dynflow/persistence_adapters/sequel.rb:263:in `migrate_db'