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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
My guess: you are hitting OOM because PGN files are huge? On https://github.com/bhlangonijr/chesslib there is small usage tutorial and they mention this:
Here's what I got: https://github.com/AdamCerutti/ChessDataMigration/blob/main/ChessData.java
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