Add a rake task to rebuild the device cookie_uuid index

lib/tasks/db_rebuild_cookie_uuid_index.rake

@@ -0,0 +1,35 @@
+namespace :db do
+  desc 'Tear down and recreate the cookie_uuid index on devices'
+  task rebuild_cookie_uuid_index: :environment do
+    ## Set statement timeout to 1 hour
+    ActiveRecord::Base.connection.execute('SET statement_timeout = 3600000')
+
+    ## First, delete the old, invalid index if it exists
+    existing_index_result = ActiveRecord::Base.connection.execute(
+      "SELECT indexname FROM pg_indexes WHERE indexname = 'index_devices_on_cookie_uuid'",
+    )
+    if existing_index_result.num_tuples > 0
+      puts 'Index index_devices_on_cookie_uuid exists, dropping...'
+      ActiveRecord::Base.connection.execute('DROP INDEX CONCURRENTLY index_devices_on_cookie_uuid')
+    end
+
+    ## Run the SQL from the migration to create the new index
+    puts 'Creating new index_devices_on_cookie_uuid index'
+    ActiveRecord::Base.connection.execute(
+      'CREATE INDEX CONCURRENTLY "index_devices_on_cookie_uuid" ON "devices" ("cookie_uuid")',
+    )
+  end
+
+  desc 'Check for an invalid cookie_uuid index on devices and print the result'
+  task check_for_invalid_cookie_uuid_index: :environment do
+    query = <<~SQL
+      SELECT * FROM pg_class, pg_index
+      WHERE pg_index.indisvalid = false
+        AND pg_index.indexrelid = pg_class.oid
+        AND pg_class.relname = 'index_devices_on_cookie_uuid'
+    SQL
+    results = ActiveRecord::Base.connection.execute(query)
+
+    puts "Found #{results.num_tuples} invalid index(es)"
+  end
+end