SQLAlchemy datetime operations on server side

Question

I have a table with scheduled and past payments, and I need to find if there are any two charges made in the same week for the same user/contract.

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Answer 1

If you need this only for DAYs (which are default intervals), then simply restating your SQL as:

c2.due_time > ADDDATE(c1.due_time, - 7)

can be written in SA terms as:

filter(Charge.due_time > func.ADDDATE(OldCharge.due_time, -7))

If you need to filter for different interval types (weeks, months, years), you probably need to write a custom SQL Construct compiler (see Custom SQL Constructs and Compilation Extension for more info).