Connection to the db

[3nids]

I think that one of the first step should be to agree on the way we use the db. I will try to resume the ones we discussed and write down pros and cons.

1. We use editing mode as it is right now.
2. keep usual way of editing
3. we cannot use object that are not in the db yet, and therefore we cannot create objects in a chain
4. We save the element in the db as soon as they are created
5. can create objects in chain
6. not usual way of editing in qgis
7. no undo redo
8. We create the uuid in qgis
9. we can create objects in chain
10. we can use undo redo
11. we keep editing mode style, i.e. start and stop editing
12. We use negative ids of qgis
13. the same as for choice 3
14. we need to create rules for insertion by using the correct ids and doing the insertion in a special order to avoid the break of foreign keys.

In all of the four cases, it should not be a problem to use something else than Postgres. It might be useful for a small town with a single user to use qgis with SQLite, as there is no special setup...

[3nids]

Error in layout. Cannot delete r edit from iPad.