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Engineering for Reproducibility and Trust Initial backtests often start as ad-hoc scripts, quickly validating a simple idea against a small dataset. This approach is fine for rapid prototyping, but it quickly becomes a liability as strategies grow in complexity, data volumes expand, and the need for rigorous validation intensifies. To transition from tactical scripting to strategic system development, we must adopt an advanced engineering mindset centered on quality, consistency, and scalability. This means building backtesting infrastructure that is robust, auditable, and capable of supporting a portfolio of strategies. Data Integrity Pipelines: The Foundation of Trust The first pillar of a...