Firetext does not have a status code for temporary-failure.

In order to set a message as temporary-failure, we check if it is in pending status first.
Otherwise a delivery receipt for failure is set to permanent failure.

migrations/versions/0022_add_pending_status.py

@@ -0,0 +1,51 @@
+"""empty message
+
+Revision ID: a726fff4ed59
+Revises: 0022_add_pending_status
+Create Date: 2016-05-25 15:47:32.568097
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '0022_add_pending_status'
+down_revision = '0021_add_delivered_failed_counts'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    status_type = sa.Enum('sending', 'delivered', 'pending', 'failed',
+                          'technical-failure', 'temporary-failure', 'permanent-failure',
+                          name='notify_status_types')
+    status_type.create(op.get_bind())
+    op.add_column('notifications', sa.Column('new_status', status_type, nullable=True))
+    op.execute('update notifications set new_status = CAST(CAST(status as text) as notify_status_types)')
+    op.alter_column('notifications', 'status', new_column_name='old_status')
+    op.alter_column('notifications', 'new_status', new_column_name='status')
+    op.drop_column('notifications', 'old_status')
+    op.get_bind()
+    op.execute('DROP TYPE notification_status_type')
+    op.alter_column('notifications', 'status', nullable=False)
+
+    ### end Alembic commands ###
+
+
+def downgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    status_type = sa.Enum('sending', 'delivered', 'failed',
+                          'technical-failure', 'temporary-failure', 'permanent-failure',
+                          name='notification_status_type')
+    status_type.create(op.get_bind())
+    op.add_column('notifications', sa.Column('old_status', status_type, nullable=True))
+
+    op.execute("update notifications set status = 'sending' where status = 'pending'")
+    op.execute('update notifications set old_status = CAST(CAST(status as text) as notification_status_type)')
+    op.alter_column('notifications', 'status', new_column_name='new_status')
+    op.alter_column('notifications', 'old_status', new_column_name='status')
+    op.drop_column('notifications', 'new_status')
+    op.get_bind()
+    op.execute('DROP TYPE notify_status_types')
+    op.alter_column('notifications', 'status', nullable=False)
+    ### end Alembic commands ###