Get the total values in each month using Django QuerySet -

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This model is for (overtime). class overtime (incase): day = model. I need to remove the total value for each month. I now use a daily quercet in the manager. I am doing 
  class overtime manager (models.Manager): def daily_report (self): return self.values ​​('day'). Annotated (hour = model ('' value '')). The order ('- day')   
 However now I need a monthly report which will be the sum of  value  for each month. I tried to remove the first month but then I lose the value.  
 Note: In the month should not be the total amount for all the years, especially me  month, year  Div class = "post-text" itemprop = "text"> 
 If you are using Postgresql, you can do this. There are futures similar to OCD.  
  overtime.obbs.ctroy ({'month': "to_char (day, 'soma)", "year": "remove (day to year)"

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