Add cascade deletion of jobs and corpora on user delete.

app/models.py

@@ -113,8 +113,10 @@ class User(UserMixin, db.Model):
     role_id = db.Column(db.Integer, db.ForeignKey('roles.id'))
     username = db.Column(db.String(64), unique=True, index=True)
     # Relationships
-    corpora = db.relationship('Corpus', backref='creator', lazy='dynamic')
-    jobs = db.relationship('Job', backref='creator', lazy='dynamic')
+    corpora = db.relationship('Corpus', backref='creator', lazy='dynamic',
+                              cascade='save-update, merge, delete')
+    jobs = db.relationship('Job', backref='creator', lazy='dynamic',
+                           cascade='save-update, merge, delete')
 
     def __repr__(self):
         """