What I would expect to see is something like:
1. Here's what data we want from each police department each day. Here's what value you should use to indicate that data is not available.
2. Here's a list of police departments. Write a scraper. If it passes tests to show it's generating valid data, and code review, we will run the scraper in a daily basis storing the output in this database.
3. Here's how you can query our database.