Financial Data Persistence via WebSocket & SQL (Full-Stack)

For developers building quantitative trading systems, financial data analytics platforms, or market dashboards, the core requirement is never just "getting data"—it’s "getting data reliably, querying it flexibly, and reusing it effectively." Many developers start by calling financial data APIs directly for ad-hoc analysis, but as data volumes grow and requirements evolve, they quickly face pain points: repeated API calls, disorganized data, and inefficient queries. The right implementation lo