Update README.md

README.md

@@ -4,3 +4,15 @@ This repository has the purpose to develop a webapplication that can be used by
 JDAV to send newsletters, manage user lists and keep material lists up to date.
 As this repository is also meant to be a base for exchange during development, feel free
 to contribute ideas in form of edits to this README, issues, landmarks, projects, wiki entries, ...
+
+# Useful stuff
+
+## Reset database for certain app
+
+The following can be useful in case that automatic migrations throw errors.
+
+1. delete everything in the migrations folder except for __init__.py.
+2. drop into my MySQL console and do: DELETE FROM django_migrations WHERE app='my_app'
+3. while at the MySQL console, drop all of the tables associated with my_app.
+4. re-run ./manage.py makemigrations my_app - this generates a 0001_initial.py file in my migrations folder.
+5. run ./manage migrate my_app - I expect this command to re-build all my tables, but instead it says: "No migrations to apply."