Removed month and year and replaced it with start_date and end_date.

This will allow us to sort the data properly.

migrations/versions/0112_add_start_end_dates.py

@@ -0,0 +1,54 @@
+"""empty message
+
+Revision ID: 0112_add_start_end_dates
+Revises: 0111_drop_old_service_flags
+Create Date: 2017-07-12 13:35:45.636618
+
+"""
+from datetime import datetime
+from alembic import op
+import sqlalchemy as sa
+from app.dao.date_util import get_month_start_end_date
+
+down_revision = '0111_drop_old_service_flags'
+revision = '0112_add_start_end_dates'
+
+
+def upgrade():
+    op.drop_index('uix_monthly_billing', 'monthly_billing')
+    op.add_column('monthly_billing', sa.Column('start_date', sa.DateTime))
+    op.add_column('monthly_billing', sa.Column('end_date', sa.DateTime))
+    conn = op.get_bind()
+    results = conn.execute("Select id, month, year from monthly_billing")
+    res = results.fetchall()
+    for x in res:
+        start_date, end_date = get_month_start_end_date(
+            datetime(int(x.year), datetime.strptime(x.month, '%B').month, 1))
+        conn.execute("update monthly_billing set start_date = '{}', end_date = '{}' where id = '{}'".format(start_date,
+                                                                                                            end_date,
+                                                                                                            x.id))
+    op.alter_column('monthly_billing', 'start_date', nullable=False)
+    op.alter_column('monthly_billing', 'end_date', nullable=False)
+    op.drop_column('monthly_billing', 'month')
+    op.drop_column('monthly_billing', 'year')
+
+    op.create_index(op.f('uix_monthly_billing'), 'monthly_billing', ['service_id', 'start_date', 'notification_type'],
+                    unique=True)
+
+
+def downgrade():
+    op.add_column('monthly_billing', sa.Column('month', sa.String(), nullable=True))
+    op.add_column('monthly_billing', sa.Column('year', sa.Float(), nullable=True))
+    conn = op.get_bind()
+    results = conn.execute("Select id, start_date, end_date from monthly_billing")
+    res = results.fetchall()
+    for x in res:
+        year = datetime.strftime(x.end_date, '%Y')
+        month = datetime.strftime(x.end_date, '%B')
+        conn.execute("update monthly_billing set month = '{}', year = {} where id = '{}'".format(month, year, x.id))
+
+    op.drop_column('monthly_billing', 'start_date')
+    op.drop_column('monthly_billing', 'end_date')
+
+    op.create_index(op.f('uix_monthly_billing'), 'monthly_billing',
+                    ['service_id', 'month', 'year', 'notification_type'], unique=True)