diff --git a/superset/migrations/versions/3317e9248280_add_creation_method_to_reports_model.py b/superset/migrations/versions/3317e9248280_add_creation_method_to_reports_model.py
new file mode 100644
index 00000000000..169d4d2b74c
--- /dev/null
+++ b/superset/migrations/versions/3317e9248280_add_creation_method_to_reports_model.py
@@ -0,0 +1,48 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+"""add_creation_method_to_reports_model
+
+Revision ID: 3317e9248280
+Revises: 453530256cea
+Create Date: 2021-07-14 10:31:38.610095
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = "3317e9248280"
+down_revision = "453530256cea"
+
+import sqlalchemy as sa
+from alembic import op
+
+
+def upgrade():
+    with op.batch_alter_table("report_schedule") as batch_op:
+        batch_op.add_column(
+            sa.Column(
+                "creation_method", sa.VARCHAR(255), server_default="alert_reports",
+            )
+        )
+        batch_op.create_index(
+            op.f("ix_creation_method"), ["creation_method"], unique=False
+        )
+
+
+def downgrade():
+    with op.batch_alter_table("report_schedule") as batch_op:
+        batch_op.drop_index("ix_creation_method")
+        batch_op.drop_column("creation_method")
diff --git a/superset/utils/mock_data.py b/superset/utils/mock_data.py
index 84981ca59b8..bf36e59c1e3 100644
--- a/superset/utils/mock_data.py
+++ b/superset/utils/mock_data.py
@@ -69,6 +69,9 @@ days_range = (MAXIMUM_DATE - MINIMUM_DATE).days
 
 # pylint: disable=too-many-return-statements, too-many-branches
 def get_type_generator(sqltype: sqlalchemy.sql.sqltypes) -> Callable[[], Any]:
+    if isinstance(sqltype, sqlalchemy.dialects.mysql.types.TINYINT):
+        return lambda: random.choice([0, 1])
+
     if isinstance(
         sqltype, (sqlalchemy.sql.sqltypes.INTEGER, sqlalchemy.sql.sqltypes.Integer)
     ):
@@ -83,7 +86,7 @@ def get_type_generator(sqltype: sqlalchemy.sql.sqltypes) -> Callable[[], Any]:
         length = random.randrange(sqltype.length or 255)
         length = max(8, length)  # for unique values
         length = min(100, length)  # for FAB perms
-        return lambda: "".join(random.choices(string.printable, k=length))
+        return lambda: "".join(random.choices(string.ascii_letters, k=length))
 
     if isinstance(
         sqltype, (sqlalchemy.sql.sqltypes.TEXT, sqlalchemy.sql.sqltypes.Text)
@@ -91,7 +94,7 @@ def get_type_generator(sqltype: sqlalchemy.sql.sqltypes) -> Callable[[], Any]:
         length = random.randrange(65535)
         # "practicality beats purity"
         length = max(length, 2048)
-        return lambda: "".join(random.choices(string.printable, k=length))
+        return lambda: "".join(random.choices(string.ascii_letters, k=length))
 
     if isinstance(
         sqltype, (sqlalchemy.sql.sqltypes.BOOLEAN, sqlalchemy.sql.sqltypes.Boolean)
@@ -130,7 +133,7 @@ def get_type_generator(sqltype: sqlalchemy.sql.sqltypes) -> Callable[[], Any]:
 
     if isinstance(sqltype, sqlalchemy.sql.sqltypes.JSON):
         return lambda: {
-            "".join(random.choices(string.printable, k=8)): random.randrange(65535)
+            "".join(random.choices(string.ascii_letters, k=8)): random.randrange(65535)
             for _ in range(10)
         }