properly escape replacement in sql

db/migrate/20200326102408_rename_fixed_version.rb

@@ -19,7 +19,7 @@ class RenameFixedVersion < ActiveRecord::Migration[6.0]
         UPDATE
           queries q_sink
         SET
-          filters = regexp_replace(q_source.filters, '(\n)#{from}_id:(\n)', '\1#{to}_id:\2'),
+          filters = regexp_replace(q_source.filters, '(\n)#{from}_id:(\n)', '\\1#{to}_id:\\2'),
           column_names = regexp_replace(q_source.column_names, ':#{from}', ':#{to}'),
           sort_criteria = regexp_replace(q_source.sort_criteria, '#{from}', '#{to}'),
           group_by = regexp_replace(q_source.group_by, '#{from}', '#{to}')

modules/costs/db/migrate/20200327074416_rename_fixed_version_in_cost_query.rb

@@ -13,7 +13,7 @@ class RenameFixedVersionInCostQuery < ActiveRecord::Migration[6.0]
         UPDATE
           cost_queries q_sink
         SET
-          serialized = regexp_replace(q_source.serialized, '(\n- - )#{from}Id(\n)', '\1#{to}Id\2')
+          serialized = regexp_replace(q_source.serialized, '(\n- - )#{from}Id(\n)', '\\1#{to}Id\\2')
         FROM
           cost_queries q_source
         WHERE