Which database and ORM to choose for a desktop application?

Question

Database

There is a not very heavy application, written under .NET 3.5.
You need to save a dozen lists with simple objects: there are usually no more than 500 objects in the list, 5-10 primitive fields in one object. They rarely change, new objects are added no more than once every half a minute.
Now all lists are stored in memory, and when changes are made, the entire list is serialized to a file.
In connection with the future increase in the number of lists and their complication, I thought about choosing a database and ORM.
The basic requirements for the bundle are:
a) working with .NET 3.5 or 4.
b) Xamarin.NET support c
) free
d) migration support
Got anything suitable?

Answer 1

SQLite, here is the ORM