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I have the following chart, to display the total stock over a period of time (where the stock changes cause of mutations for each article that are calculated).
The stock value is calculated by date. So the month is a total sum of stock in that month.
Problem is, when an article does not have mutations in a certain month, stock value is 0. So in some months the current stock values are missing.
Is there a way to populate the empty values with the value of last month?