HydraPredict 5: A full-stack quantitative research platform for historical backtesting, built end to end from data ingestion to hosted reporting. Runs strict train/test (in-sample/out-of-sample) walkforward validation with real execution costs, then auto-generates equity curves, Sharpe ratios, drawdown analysis, and benchmark comparisons as a publishable static site. Python backend with an ML feature pipeline, Dockerized deployment, and a JS reporting frontend, covering the whole stack from raw market data to a shareable results dashboard.