This tiny blockchain indexer scrapes Transfer events emitted by the USDC contract and saves the data in a file-based dataset in a local folder ./data. It is built with the Subsquid framework, hence the term "squid".
The squid uses @subsquid/file-store and @subsquid/file-store-parquet packages to store the dataset. The result is a partitioned dataset where the data is stored in Apache Parquet files.
Dependencies: NodeJS, Squid CLI.
To see it in action, spin up a processor, a process that ingests the data from the SQD Network Portal:
git clone https://github.com/subsquid-labs/file-store-parquet-example
cd file-store-parquet-example/
npm i
sqd processYou should see a ./data folder populated with indexer data appear in a bit:
$ tree ./data/
./data/
├── 0000000000-0007258859
│ └── transfers.parquet
├── 0007258860-0007671919
│ └── transfers.parquet
...
└── status.txt