fix_csv.py

import csv
from pathlib import Path

# Test the fixed save_csv logic standalone
def save_csv_fixed(path, rows):
    if not rows: return
    all_keys = []
    seen = set()
    for row in rows:
        for k in row.keys():
            if k not in seen:
                all_keys.append(k)
                seen.add(k)
    with open(path, "w", newline="") as f:
        writer = csv.DictWriter(f, fieldnames=all_keys, extrasaction="ignore")
        writer.writeheader()
        for row in rows:
            filled = {k: row.get(k, "") for k in all_keys}
            writer.writerow(filled)
    print(f"Saved {len(rows)} rows -> {path}")

# Load the rows from the run (they were computed but CSV failed)
# Just re-run server.py with the fix applied