Add tests and fix issues

app/queries/monthly_stats.py

@@ -5,7 +5,7 @@ logger = logging.getLogger(__name__)
 
 def get_all_monthly_analytics(end_date:str = 'now'):
     try:
-        return connection.query('''                                
+        return connection().query('''                                
             WITH RECURSIVE timeseries(d) AS (
                 VALUES(date(:end_date,'start of year'))
                 UNION ALL
@@ -45,7 +45,7 @@ def get_all_monthly_analytics(end_date:str = 'now'):
 
 def get_monthly_analytics(counter_id:int, end_date:str = 'now'):
     try:
-        return connection.query('''
+        return connection().query('''
             WITH RECURSIVE timeseries(d) AS (
                 VALUES( date(:end_date, 'start of year'))
                 UNION ALL