Assume I am using an automated system to buy and sell stocks or other regulated financial assets (bitcoins, ...) multiple times a day, each time making a small win or loss. Additionally, I am doing so with a broker that is not automatically deducting taxes on capital gains for me, and that does not let me set up a "Freistellungsauftrag" to use the 801 € of untaxed capital gains I am permitted each year under the "Abgeltungssteuer". I am acting as a private citizen, not a company.
How would these gains be declared? As the assets will not be held for the 12 months required to be exempt from the Abgeltungssteuer, I assume that I would have to fill out the "Anlage KAP" (capital gains) in my income tax and declare it under "Kapitalerträge ohne Steuerabzug" (capital gains without [automated] tax deduction) and would have the 801 € deducted from the resulting taxes automatically? If so, how do I document all the individual trades that led to the net gain / loss at the end of the year? Do I need to attach a document that lists the (potentially thousands of) trades that made up this result?