When running db:migrate task, I've seen the following, preventing loading the environment and therefore migrating the database.

2020-02-13T21:39:01 [D|app|] updating existing template
2020-02-13T21:39:01 [D|app|] setting attributes for AutoYaST SLES default with id: 7
2020-02-13T21:39:01 [D|sql|]   TemplateInput Load (0.2ms)  SELECT "template_inputs".* FROM "template_inputs" WHERE "template_inputs"."template_id" = $1  [["template_id", 7]]
2020-02-13T21:39:01 [D|sql|]   ↳ app/models/template.rb:191
2020-02-13T21:39:01 [D|sql|]   ForeignInputSet Load (0.2ms)  SELECT "foreign_input_sets".* FROM "foreign_input_sets" WHERE "foreign_input_sets"."template_id" = $1  [["template_id", 7]]
2020-02-13T21:39:01 [D|sql|]   ↳ /home/ares/z/foreman_remote_execution/app/models/concerns/foreman_remote_execution/template_overrides.rb:5
2020-02-13T21:39:01 [D|sql|]   ProvisioningTemplate Exists (0.3ms)  SELECT  1 AS one FROM "templates" WHERE "templates"."type" IN ('ProvisioningTemplate') AND "templates"."name" = $1 AND "templates"."id" != $2 LIMIT $3  [["name", "AutoYaST SLES default"], ["id", 7], ["LIMIT", 1]]
2020-02-13T21:39:01 [D|sql|]   ↳ lib/seed_helper.rb:129
/home/ares/z/foreman/lib/seed_helper.rb:129:in `import_raw_template': Unable to update template AutoYaST SLES default: This template is locked. Please clone it to a new template to customize. (RuntimeError)
        from /home/ares/z/foreman/lib/seed_helper.rb:138:in `block in import_templates'
        from /home/ares/z/foreman/lib/seed_helper.rb:137:in `each'
        from /home/ares/z/foreman/lib/seed_helper.rb:137:in `import_templates'
        from /home/ares/z/foreman/db/seeds.d/070-provisioning_templates.rb:9:in `block in <main>'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/audited-4.9.0/lib/audited/auditor.rb:376:in `without_auditing'
        from /home/ares/z/foreman/db/seeds.d/070-provisioning_templates.rb:2:in `<main>'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:54:in `load'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:54:in `load'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:281:in `block in load'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:253:in `load_dependency'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:281:in `load'
        from /home/ares/z/foreman/app/services/foreman_seeder.rb:39:in `block (2 levels) in execute'
        from /home/ares/z/foreman/app/models/concerns/foreman/thread_session.rb:108:in `as'
        from /home/ares/z/foreman/app/models/concerns/foreman/thread_session.rb:114:in `as_anonymous_admin'
        from /home/ares/z/foreman/app/services/foreman_seeder.rb:38:in `block in execute'
        from /home/ares/z/foreman/app/services/foreman_seeder.rb:32:in `each'
        from /home/ares/z/foreman/app/services/foreman_seeder.rb:32:in `execute'
        from /home/ares/z/foreman/config/initializers/seeds.rb:8:in `block (2 levels) in <main>'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:69:in `block in execute_hook'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:62:in `with_execution_control'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:67:in `execute_hook'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:52:in `block in run_load_hooks'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:51:in `each'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.1/lib/active_support/lazy_load_hooks.rb:51:in `run_load_hooks'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.1/lib/rails/application/finisher.rb:75:in `block in <module:Finisher>'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.1/lib/rails/initializable.rb:32:in `instance_exec'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.1/lib/rails/initializable.rb:32:in `run'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.1/lib/rails/initializable.rb:61:in `block in run_initializers'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/2.6.0/tsort.rb:228:in `block in tsort_each'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/2.6.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/2.6.0/tsort.rb:431:in `each_strongly_connected_component_from'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/2.6.0/tsort.rb:349:in `block in each_strongly_connected_component'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/2.6.0/tsort.rb:347:in `each'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/2.6.0/tsort.rb:347:in `call'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/2.6.0/tsort.rb:347:in `each_strongly_connected_component'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/2.6.0/tsort.rb:226:in `tsort_each'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/2.6.0/tsort.rb:205:in `tsort_each'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.1/lib/rails/initializable.rb:60:in `run_initializers'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.1/lib/rails/application.rb:361:in `initialize!'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.1/lib/rails/railtie.rb:190:in `public_send'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/railties-5.2.1/lib/rails/railtie.rb:190:in `method_missing'
        from /home/ares/z/foreman/config/environment.rb:5:in `<main>'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `block in require_with_bootsnap_lfi'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require_with_bootsnap_lfi'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `block in require'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:253:in `load_dependency'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `require'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/application.rb:106:in `preload'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/application.rb:157:in `serve'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/application.rb:145:in `block in run'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/application.rb:139:in `loop'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/application.rb:139:in `run'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/spring-2.1.0/lib/spring/application/boot.rb:19:in `<top (required)>'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        from /usr/local/rbenv/versions/2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        from -e:1:in `<main>'

the fix is easy, we should ignore locking when checking whether the template is valid, like we do later when saving