如何在字段值的每个给定增量上进行GROUP BY？

I have a Python application. It has an SQLite database, full of data about things that happen, retrieved by a Web scraper from the Web. This data includes time-date groups, as Unix timestamps, in a column reserved for them. I want to retrieve the names of organisations that did things and count how often they did them, but to do this for each week (i.e. 604,800 seconds) I have data for.I have a Python application. It has an SQLite d