Blockchain Scrapers: These scrapers are used to determine attributes of blockchains. The most prominent attribute is the circulating supply of a cryptocurrency, for which various scrapers already exist. Depending on the expected update rate of a blockchain, these scrapers update the backend periodically about their data.
Blockchain scrapers are run as docker containers that can be managed independently.
Often, these collect Gigabytes of data over time (they are dealing with ever-growing blockchains) and thus should be managed in a separate way not directly baked in the database executable.