New complaints model to persist complaints from SES.

If a someone gets an email from one of our services and then complain about it (mark as spam or otherwise), we get a callback from SES.
The service needs to know about these complaints so they can remove that email from their mailing list.

migrations/versions/0196_complaints_table_.py

@@ -0,0 +1,36 @@
+"""
+
+Revision ID: 0196_complaints_table
+Revises: 0195_ft_notification_timestamps
+Create Date: 2018-05-31 14:31:36.649544
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+revision = '0196_complaints_table'
+down_revision = '0195_ft_notification_timestamps'
+
+
+def upgrade():
+    op.create_table('complaints',
+    sa.Column('id', postgresql.UUID(as_uuid=True), nullable=False),
+    sa.Column('notification_id', postgresql.UUID(as_uuid=True), nullable=False),
+    sa.Column('service_id', postgresql.UUID(as_uuid=True), nullable=False),
+    sa.Column('ses_feedback_id', sa.Text(), nullable=True),
+    sa.Column('complaint_type', sa.Text(), nullable=True),
+    sa.Column('complaint_date', sa.DateTime(), nullable=True),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.ForeignKeyConstraint(['notification_id'], ['notification_history.id'], ),
+    sa.ForeignKeyConstraint(['service_id'], ['services.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_complaints_notification_id'), 'complaints', ['notification_id'], unique=False)
+    op.create_index(op.f('ix_complaints_service_id'), 'complaints', ['service_id'], unique=False)
+
+
+def downgrade():
+    op.drop_index(op.f('ix_complaints_service_id'), table_name='complaints')
+    op.drop_index(op.f('ix_complaints_notification_id'), table_name='complaints')
+    op.drop_table('complaints')