data-engineering-handbook
Free, open-source data engineering guides and runnable labs: SQL, dbt, Spark, Kafka, Airflow, Iceberg, CDC, data quality, and AI engineering.
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Per-day rates divide a measured star count by the days it covers: the interval between two snapshots for Rising fastest, the age of the repository for New and fast. They are not fixed 24-hour changes, and stars show interest, not quality.