I plan to develop an application that is somewhat like a spreadsheet
with cells containing formulas. When a cell value is changed, things
must be updated. But the formulas can contain database queries, which
means that the cell has to be notified when the database changes in such
a way that that the result of the query changes. How is this done? I
would really like to avoid recalculating the whole thing for each change
to the database.

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