Use strong_migrations to help developers avoid problems in production database schema changes

Gemfile

@@ -61,6 +61,7 @@ gem "rack-cors"
 gem "rails-i18n", "~> 4.0.0"
 gem "record_tag_helper"
 gem "rinku", ">= 2.0.6", :require => "rails_rinku"
+gem "strong_migrations"
 gem "validates_email_format_of", ">= 1.5.1"
 
 # Native OSM extensions

Gemfile.lock

@@ -405,6 +405,8 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
+    strong_migrations (0.3.1)
+      activerecord (>= 3.2.0)
     term-ansicolor (1.7.1)
       tins (~> 1.0)
     terrapin (0.6.0)
@@ -510,6 +512,7 @@ DEPENDENCIES
   sanitize
   sassc-rails
   secure_headers
+  strong_migrations
   therubyracer
   uglifier (>= 1.3.0)
   validates_email_format_of (>= 1.5.1)

config/initializers/strong_migrations.rb

@@ -0,0 +1 @@
+StrongMigrations.start_after = 20190518115041 # rubocop:disable Style/NumericLiterals