I wanted to also try building it with mongodb. Had a small experiment with and is also nice for the way i handle the transactions.
This method with csv is just easy also for others to use without knowledge of setting up a database etc.
For now my biggest file is 40MB, not that much. I do not store all the data just the data i need.
The most important one is the transaction id (or battle_id), that always be use to migrate and extend data I'm really missing it in the future.
