fix db connection pool

app/celery/scheduled_tasks.py

@@ -243,6 +243,8 @@ def check_for_services_with_high_failure_rates_or_sending_to_tv_numbers():
     bind=True, max_retries=7, default_retry_delay=3600, name="process-delivery-receipts"
 )
 def process_delivery_receipts(self):
+    # If we need to check db settings do it here for convenience
+    # current_app.logger.info(f"POOL SIZE {app.db.engine.pool.size()}")
     """
     Every eight minutes or so (see config.py) we run this task, which searches the last ten
     minutes of logs for delivery receipts and batch updates the db with the results.  The overlap