How to distinguish in master data and calculated interpolated data?

I'm getting a bunch of vectors with datapoints for a fixed set of values, in the example below you see an example of a vector with a value per time point

1D:2
2D:
7D:5
1M:6
6M:6.5

But alas not for all the timepoints is a value available. All vectors are stored in a database and with a trigger we calcuate the missing values by interpolation, or possibly a more advanced algorithm. Somehow I want to be able to tell which data points have been calculated and which have been original delivered to us. Of course I can add a flag column to the table with values indicating whether the value was a master value or is calculated, but I'm wondering whether there is a more sophisticated way. We probably don't need to determine on a regular basis, so cpu cycles are not an issue for determining or insertion.

The example above shows some nice looki开发者_如何学Cng numbers but in reality it would look more somethin like 3.1415966533.

The database for storage is called oracle 10.

cheers.

Could you deactivate the trigger temporarily?