diff --git a/data b/data
index e7ed25899840597abae0aa240004ce1b6ea1122c..931e10de77a215881bc4fb87ed3e369a97e516b6 160000
--- a/data
+++ b/data
@@ -1 +1 @@
-Subproject commit e7ed25899840597abae0aa240004ce1b6ea1122c
+Subproject commit 931e10de77a215881bc4fb87ed3e369a97e516b6
diff --git a/src/flask_covid19/blueprints/data_ecdc/ecdc_model.py b/src/flask_covid19/blueprints/data_ecdc/ecdc_model.py
index b8d91ac68762c6611f6f76f21cbf9cda7c564d35..a8cb98c47f67dd0abae2dd4154c1bb587e755f16 100644
--- a/src/flask_covid19/blueprints/data_ecdc/ecdc_model.py
+++ b/src/flask_covid19/blueprints/data_ecdc/ecdc_model.py
@@ -232,6 +232,7 @@ class EcdcCountry(BlueprintLocation):
 
 class EcdcData(BlueprintFactTable):
     __tablename__ = 'ecdc'
+    __mapper_args__ = {'concrete': True}
 
     id = db.Column(db.Integer, primary_key=True)
     deaths = db.Column(db.Integer, nullable=False)
diff --git a/src/flask_covid19/blueprints/data_owid/owid_model.py b/src/flask_covid19/blueprints/data_owid/owid_model.py
index 748976eac0df22e9e05f83a6bd14448b52acd86c..a86be3787647955d4a83845a77281dc0fd1c9efa 100644
--- a/src/flask_covid19/blueprints/data_owid/owid_model.py
+++ b/src/flask_covid19/blueprints/data_owid/owid_model.py
@@ -86,6 +86,7 @@ class OwidContinent(BlueprintLocationGroup):
 
 class OwidCountry(BlueprintLocation):
     __tablename__ = 'owid_country'
+    __mapper_args__ = {'concrete': True}
     __table_args__ = (
         db.UniqueConstraint('iso_code', 'location', name="uix_owid_country"),
     )
@@ -176,6 +177,7 @@ class OwidCountry(BlueprintLocation):
 
 class OwidData(BlueprintFactTable):
     __tablename__ = 'owid'
+    __mapper_args__ = {'concrete': True}
 
     id = db.Column(db.Integer, primary_key=True)
     date_reported_id = db.Column(db.Integer,
diff --git a/src/flask_covid19/blueprints/data_rki/rki_model.py b/src/flask_covid19/blueprints/data_rki/rki_model.py
index 54c658c1944898415886237adf361388ec04ddb5..2615364b44d68e07b2705278ede751fd331fb30e 100644
--- a/src/flask_covid19/blueprints/data_rki/rki_model.py
+++ b/src/flask_covid19/blueprints/data_rki/rki_model.py
@@ -179,6 +179,7 @@ class RkiLandkreis(BlueprintLocation):
 
 class RkiData(BlueprintFactTable):
     __tablename__ = 'rki'
+    __mapper_args__ = {'concrete': True}
 
     id = db.Column(db.Integer, primary_key=True)
     fid = db.Column(db.String(255), nullable=False)