Your question is Build a Stocks Data Endpoint. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Given the following database + data, please build a simple API that accepts a date range and ticker(s) and returns a JSON payload with company name, ticker, date, high price, low price, and closing price grouped by day, with an optional flag to group weekly.