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Anki-Android
AnkiDroid: Anki flashcards on Android. Your secret trick to achieve superhuman information retention.
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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.
There's an add-on which allows you to copy Notes from one deck to another by u/arthurmilchior. Copy notes on ankiweb more info here: Anki Copy Note on github.
From a technical point of view only cards can be in decks, see https://github.com/ankidroid/Anki-Android/wiki/Database-Structure . A card can not exist without an underlying note. So if you want to copy a card from one deck to another you must first duplicate the note and then adjust the deck for the cards generated from the duplicated note.