Author	SHA1	Message	Date
Alexander Hess	cc75307e5a	Add DistanceMatrix class ... - the class stores the data of a distance matrix between all addresses + air distances + bicycle distances - in addition, the "path" returned by the Google Directions API are also stored as a JSON serialized sequence of latitude-longitude pairs - we assume a symmetric graph	2021-09-12 16:51:10 +02:00
Alexander Hess	daa224d041	Rename _*_id columns into just *_id	2021-01-05 22:37:12 +01:00
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