In this article, we are going to debug a Flask app inside a local Docker container through VS Code's fancy debugger, and simultaneously we are still able to leverage Flask's auto-reloading mechanism. It should apply to other Python apps.
The order of fields in an index matters, you must consider Index Cardinality and Selectivity. Instead, the order of fields in a find() query doesn't affect whether it can use an index or not.
Frequently accessed items are cached in memory, so that MongoDB can provide optimal response time.
You are able to run any Celery task at a specific time through eta (means "Estimated Time of Arrival") parameter.
You should always store datetimes in UTC and convert to proper timezone on display.