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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.
vcard-domain-model of https://github.com/mangstadt/ez-vcard android-compatible java code without any android dependencies implements reading/writing in different formats (vcf text-format, xml-format, html-format)
https://github.com/mangstadt/ez-vcard-android android java code that implements loading vcard-objects into the android contacts database (usecase vcard-contacts-import) currenlty no implementation for saving (export)
There is already https://github.com/bitfireAT/vcard4android/tree/main/src/main/java/at/bitfire/vcard4android * gpl adroid-kotlin code * based on ez-vcard and ez-vcard-android * adds support for loading vcard(s) from android-contacts. (usecase contacts-vcard-export)
Out of curiosity, would you be willing to elaborate why you used interfaces for the Data Models as opposed to something like a data class? e.g. Contact.kt