Trade simulation engine with realistic bid/ask fills

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I've been tinkering as a solo quant dev and built a trade simulation engine that uses real bid/ask data with 5-second candles to model executions more realistically than most backtesting frameworks I've tried.After experimenting with the most popular backtesting libraries, I wanted something that handled 5-second (the lowest interval data I have access to) and bid/ask fill behavior better. So I ended up building my own prediction and simulation stack - Python, Pandas, SQLite, DuckDB, Torch, etc.The simulated fills line up closely with empirical results from actual trades (the sim is deliberately a bit pessimistic), so I'm feeling confident in its accuracy so far. The live trader itself is an

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