Author	SHA1	Message	Date
Alexander Hess	f996376b13	Add ORM models for the pixel grids ... - add Grid, Pixel, and AddressPixelAssociation ORM models - each Grid belongs to a City an is characterized by the side_length of all the square Pixels contained in it - Pixels aggregate Addresses => many-to-many relationship (that is modeled with SQLAlchemy's Association Pattern to implement a couple of constraints)	2021-01-03 19:33:36 +01:00