add migration to set GenEmail.mailbox_id non-nullable

migrations/versions/2020_030521_235355381f53_.py

@@ -0,0 +1,33 @@
+"""empty message
+
+Revision ID: 235355381f53
+Revises: 7eef64ffb398
+Create Date: 2020-03-05 21:37:42.266722
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '235355381f53'
+down_revision = '7eef64ffb398'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('gen_email', 'mailbox_id',
+               existing_type=sa.INTEGER(),
+               nullable=False)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('gen_email', 'mailbox_id',
+               existing_type=sa.INTEGER(),
+               nullable=True)
+    # ### end Alembic commands ###