To put the ability of creating query,Form and Report.
If memento have the ability to create query, form and report, it will make memento 1 of the most amazing apps in the world.

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Guillaume commented
I totally agree: forms to easily manipulate data would be awesome!
My suggestion would be:
Allow us to create custom forms where records could be seen and edited, also with scripting for bulk automation.Example use case:
1. Scan a barcode
2. The record shows on the screen
3. The "quantity" field gets decremented
4. The screen shows whether the action was a success or a failure
5. Ready to scan another record - without having had to click on a single button!I really wish Memento could do it, because it is the best-looking and most practical database app I've seen so far, and I wouldn't like to have to get used to another one for this matter!
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mukura commented
Partucularly from widget side for preset queries.
I had a look at the memento.db via sqlite debugger and there may be some way to do a work around for some basic operations, but would be fantastic in app