Add empty migration to replace the removed schedule_until migration

Add merge migration.

migrations/versions/151a4c333e96_.py

@@ -0,0 +1,24 @@
+"""empty message
+
+Revision ID: 151a4c333e96
+Revises: 2ba47e9812b1, e5c7a4e2df4d
+Create Date: 2019-03-26 19:32:29.052222
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '151a4c333e96'
+down_revision = ('2ba47e9812b1', 'e5c7a4e2df4d')
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    pass
+
+
+def downgrade():
+    pass

migrations/versions/eb2f788f997e_.py

@@ -0,0 +1,23 @@
+"""empty message
+
+Revision ID: eb2f788f997e
+Revises: d1eae8b9893e
+Create Date: 2017-03-02 12:20:00.029066
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'eb2f788f997e'
+down_revision = 'd1eae8b9893e'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    pass
+
+
+def downgrade():
+    pass