add sequence to Top

This is so that later we can show the tops in the
correct order

migrations/versions/b2574371025b_add_sequence_to_top.py

@@ -0,0 +1,24 @@
+"""add_sequence_to_top
+
+Revision ID: b2574371025b
+Revises: f31e2387c73a
+Create Date: 2017-08-31 11:09:21.749110
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'b2574371025b'
+down_revision = 'f31e2387c73a'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.add_column('tops', sa.Column('sequence', sa.Integer(), nullable=True))
+
+
+def downgrade():
+    op.drop_column('tops', 'sequence')

models.py

@@ -77,6 +77,7 @@ class Top(db.Model):
     category = db.Column(db.String)
     duration = db.Column(db.Integer)
     held_on = db.Column(db.Date)
+    sequence = db.Column(db.Integer)
 
 
     @staticmethod