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I really believe that such many examples on same thing (fetching ohlcv with just different variable namings and periphericals) was too much confusing, and it would lead more frustration than benefit. The typical signature is already mentioned in manual, but for "an example" advanced usage, I've tried to put it in one example file, where it demonstrates how to download "multiple symbols ohlcvs" parallely, including the "from-to" diapason variables.
also removed duplicate "fetch-balance" snippets, also, there were API KEYs leakage (probably already dead, but still..).