diff --git a/src/flask_covid19/blueprints/data_rki/rki_model.py b/src/flask_covid19/blueprints/data_rki/rki_model.py
index 130b8dc966263cff57b73d4bd5f9b6b2e87aa855..f8f2702899145892f87da492f9245ca3dd14c56d 100644
--- a/src/flask_covid19/blueprints/data_rki/rki_model.py
+++ b/src/flask_covid19/blueprints/data_rki/rki_model.py
@@ -178,6 +178,12 @@ class RkiLandkreis(BlueprintLocation):
         return rki_landkreis_dict
 
 
+association_table_rki_to_altersgruppe = db.Table('rki_to_altersgruppe', db.Model.metadata,
+    db.Column('rki_id', db.Integer, db.ForeignKey('rki.id')),
+    db.Column('rki_altersgruppe_id', db.Integer, db.ForeignKey('rki_altersgruppe.id'))
+)
+
+
 class RkiAltersgruppe(BlueprintEntity):
     __tablename__ = 'rki_altersgruppe'
     __mapper_args__ = {'concrete': True}
@@ -189,6 +195,10 @@ class RkiAltersgruppe(BlueprintEntity):
     processed_update = db.Column(db.Boolean, nullable=False)
     processed_full_update = db.Column(db.Boolean, nullable=False)
     altersgruppe = db.Column(db.String(255), nullable=False)
+    datas = db.relationship(
+        'RkiData',
+        secondary=association_table_rki_to_altersgruppe,
+        back_populates="altersgruppen")
 
     @classmethod
     def get_all_as_page(cls, page: int):
@@ -212,12 +222,6 @@ class RkiAltersgruppe(BlueprintEntity):
         return altersgruppe_dict
 
 
-association_table_rki_to_altersgruppe = db.Table('rki_to_altersgruppe', db.Model.metadata,
-    db.Column('rki_id', db.Integer, db.ForeignKey('rki.id')),
-    db.Column('rki_altersgruppe_id', db.Integer, db.ForeignKey('rki_altersgruppe.id'))
-)
-
-
 class RkiData(BlueprintFactTable):
     __tablename__ = 'rki'
     __mapper_args__ = {'concrete': True}
@@ -245,6 +249,7 @@ class RkiData(BlueprintFactTable):
         'RkiAltersgruppe',
         secondary=association_table_rki_to_altersgruppe,
         lazy='joined',
+        back_populates="datas",
         cascade='save-update, delete',
         order_by='desc(RkiAltersgruppe.altersgruppe)')
     neuer_fall = db.Column(db.String(255), nullable=False)