Build a comprehensive USA real-estate dataset from Zillow, Redfin, and Realtor.com to analyze property listings, prices, availability, market activity, and status changes. Collect key fields such as property address, listing price, bedrooms, bathrooms, property type, square footage, lot size, agent details, listing status, price changes, sold history, geocoding, and timestamps. Track listing freshness and status events regularly to identify market trends, compare neighborhoods, monitor price movements, and support accurate real-estate market research.