Add necessary migration script

migrations/versions/2020_022316_e3cb44b953f2_.py

@@ -0,0 +1,39 @@
+"""empty message
+
+Revision ID: e3cb44b953f2
+Revises: f580030d9beb
+Create Date: 2020-02-23 16:43:45.843338
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'e3cb44b953f2'
+down_revision = 'f580030d9beb'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('manual_subscription',
+    sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
+    sa.Column('created_at', sqlalchemy_utils.types.arrow.ArrowType(), nullable=False),
+    sa.Column('updated_at', sqlalchemy_utils.types.arrow.ArrowType(), nullable=True),
+    sa.Column('user_id', sa.Integer(), nullable=False),
+    sa.Column('end_at', sqlalchemy_utils.types.arrow.ArrowType(), nullable=False),
+    sa.Column('comment', sa.Text(), nullable=True),
+    sa.ForeignKeyConstraint(['user_id'], ['users.id'], ondelete='cascade'),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('user_id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('manual_subscription')
+    # ### end Alembic commands ###