Contact person: Business Client

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Location: Manyar, Indonesia

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I have raw trade logs coming from the lighter exchange and saved as comma-separated CSV files. Each record may be only a partial fill, so for a single side and symbol I might see something like “L1 L3 L5 S2 S3 S5.”

I want a small, local script that:

• Reads the existing CSV (column headers already present) containing multiple symbols.
• Groups partial fills by side (L/S) and symbol, sums their sizes, and leaves the original rows intact.
• Appends two extra rows per symbol/side showing the net size and a new “status” field set to “closed” when the long and short totals cancel each other out, otherwise “running.”
• Exports a fresh CSV that keeps the original trade details plus these aggregated results—ready for further analysis.

Please build it in any open-source language that runs on macOS or Linux without paid licenses. Include a quick README with install-run instructions and a sample run reproducing the example above so I can verify everything locally." (client-provided description)