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postgres-operator
Production PostgreSQL for Kubernetes, from high availability Postgres clusters to full-scale database-as-a-service. (by CrunchyData)
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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.
Deploy a postgresql database on the cluster, if you want a reference architecture or a view of "production ready" db in production, try this https://github.com/CrunchyData/postgres-operator.
I'd recommend just writing simple Flask Application, it's really easy https://flask.palletsprojects.com/en/2.1.x/, or if you want the one with better documentation try django https://www.djangoproject.com/.
NOTE:
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Hence, a higher number means a more popular project.