New ask Hacker News story: Please help me with my Database choice

Please help me with my Database choice
2 by appalam | 2 comments on Hacker News.
I am planning to make an mobile app (no web apps) for ios and android. It is a flashcard app and I am going to use swiftui and kotlin. The flashcards are around a million in number, organised into 19 subjects, 5-10sections each, 10-20chapters under each section and several subtopics under each chapter. An user will study daily from multiple chapters and subtopics from various subjects. I need to store that data and use it to run a spaced repetition algorithm and give dailycards for review. this will help them achieve spaced recall for effective memory. I may achieve 50,000 MAUs soon after launch. In future I will also be adding question banks to the app. I am confused about going with mongo + realm or postgres + sqllite. Please help me choose. My users will be primarily from asia.

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