Am I Better at Long or Short Trades?

That is a decision for you, and the data alone does not make it. The comparison shows how your shorts have performed. Whether to stop, to change how you take them, or to wait for more history depends on how many trades support it and what the market was doing.

It reads the side column in your file, accepting long and short, or buy and sell. If your exchange reports the closing order's side instead of the position's, the labels can be reversed, so check a trade or two against your records.

Then there is nothing to compare, and this check is skipped. The analyzer still reports your performance and the other patterns for the trades you have.

A CSV where each row is one finished trade with its result: your exchange's closed positions or profit-and-loss history. It needs a close time and a result, or entry price, exit price, quantity and side. A list of individual order fills is not enough, because fills cannot be paired into trades without guessing.

The file is read in memory and is not saved. Only the result of the analysis is kept: for 7 days if you do not sign in, or until you delete it if you save it to your account. The analyzer never asks for exchange passwords or API keys.