- ATTOM Property API integration for structured property data - USPS address standardization via API - County clerk/recorder feed scraping for deed changes and liens - Rate limiting, caching, and retry logic - Unit tests for each data source adapter - PropertyRecord, CountyDeedRecord, DataSourceType types in types.ts - Consolidated type exports in index.ts Co-Authored-By: Paperclip <noreply@paperclip.ing>