Add database constraints

db/migrate/20191004095229_change_reserved_domains_name_to_not_null.rb

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+class ChangeReservedDomainsNameToNotNull < ActiveRecord::Migration
+  def change
+    change_column_null :reserved_domains, :name, false
+  end
+end

db/migrate/20191004103144_add_reserved_domains_name_uniq_constraint.rb

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+class AddReservedDomainsNameUniqConstraint < ActiveRecord::Migration
+  def up
+    execute <<-SQL
+      ALTER TABLE reserved_domains ADD CONSTRAINT uniq_reserved_domains_name UNIQUE (name);
+    SQL
+  end
+
+  def down
+    execute <<-SQL
+      ALTER TABLE reserved_domains DROP CONSTRAINT uniq_reserved_domains_name;
+    SQL
+  end
+end

db/migrate/20191004105643_change_blocked_domains_name_to_not_null.rb

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+class ChangeBlockedDomainsNameToNotNull < ActiveRecord::Migration
+  def change
+    change_column_null :blocked_domains, :name, false
+  end
+end

db/migrate/20191004105732_add_blocked_domains_name_uniq_constraint.rb

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+class AddBlockedDomainsNameUniqConstraint < ActiveRecord::Migration
+  def up
+    execute <<-SQL
+      ALTER TABLE blocked_domains ADD CONSTRAINT uniq_blocked_domains_name UNIQUE (name);
+    SQL
+  end
+
+  def down
+    execute <<-SQL
+      ALTER TABLE blocked_domains DROP CONSTRAINT uniq_blocked_domains_name;
+    SQL
+  end
+end

db/migrate/20191004154844_add_constraints.rb

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+class AddConstraints < ActiveRecord::Migration
+  def change
+    change_column_null :registrant_verifications, :domain_name, false
+    change_column_null :registrant_verifications, :verification_token, false
+    change_column_null :registrant_verifications, :action, false
+    change_column_null :registrant_verifications, :domain_id, false
+    change_column_null :registrant_verifications, :action_type, false
+    add_foreign_key :registrant_verifications, :domains
+
+    change_column_null :zones, :origin, false
+    change_column_null :zones, :ttl, false
+    change_column_null :zones, :refresh, false
+    change_column_null :zones, :retry, false
+    change_column_null :zones, :expire, false
+    change_column_null :zones, :minimum_ttl, false
+    change_column_null :zones, :email, false
+    change_column_null :zones, :master_nameserver, false
+  end
+end

db/migrate/20191005162437_add_constraints_part_ii.rb

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+class AddConstraintsPartIi < ActiveRecord::Migration
+  def change
+    change_column_null :white_ips, :registrar_id, false
+    add_foreign_key :white_ips, :registrars
+  end
+end

db/migrate/20191007123000_add_constraints_part_iii.rb

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+class AddConstraintsPartIii < ActiveRecord::Migration
+  def change
+    change_column_null :domains, :name, false
+    change_column_null :domains, :name_puny, false
+    change_column_null :domains, :name_dirty, false
+  end
+end