fixing postgres tasks

config/initializers/postgresql_database_tasks.rb

+module ActiveRecord
+  module Tasks
+    class PostgreSQLDatabaseTasks
+      def drop
+        establish_master_connection
+        connection.select_all "select pg_terminate_backend(pg_stat_activity.pid) from pg_stat_activity where datname='#{configuration['database']}' AND state='idle';"
+        connection.drop_database configuration['database']
+      end
+    end
+  end
+end
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