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carp
A modular indexer for Cardano with an SQL Postgres backend (an alternative to the well known cardano-db-sync) (by dcSpark)
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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.
You may be interested in oura-postgres-sink. The project is still under construction (and there is also a Catalyst proposal for its continued development).
NOTE:
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Hence, a higher number means a more popular project.