I'm not an expert in police staffing levels, just poking around and asking questions. This seems interesting from your second link:
> The number of Oakland Police Department officers has varied from a low of 626 (in 1996 and in 2012) to a high of 814 (in 2002). There were 723 officers at the end of 2015. The city's strategic plan recommended 925 officers, and an independent study commissioned by the city in the mid-1990s recommended 1,200 officers. As of 2025, the city employed only 675 police officers, budgeted for only 600, and of these, 100 were on leave.
Maybe that explains some of the overtime numbers?