Create a table SERVICE_DATA_RETENTION to store the number of days the notification is to be kept for.

app/models.py

@@ -1843,3 +1843,15 @@ class Complaint(db.Model):
             'complaint_date': self.complaint_date.strftime(DATETIME_FORMAT) if self.complaint_date else None,
             'created_at': self.created_at.strftime(DATETIME_FORMAT),
         }
+
+
+class ServiceDataRetention(db.Model):
+    __tablename__ = 'service_data_retention'
+
+    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), unique=False, index=True, nullable=False)
+    service = db.relationship(Service, backref=db.backref('service_data_retention'))
+    notification_type = db.Column(notification_types, nullable=False)
+    days_of_retention = db.Column(db.Integer, nullable=False)
+    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
+    updated_at = db.Column(db.DateTime, nullable=True, default=datetime.datetime.utcnow)

migrations/versions/0202_service_data_retention.py

@@ -0,0 +1,35 @@
+"""
+
+Revision ID: 0202_service_data_retention
+Revises: 0201_another_letter_org
+Create Date: 2018-07-10 11:22:01.761829
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+revision = '0202_service_data_retention'
+down_revision = '0201_another_letter_org'
+
+
+def upgrade():
+    op.create_table('service_data_retention',
+                    sa.Column('id', postgresql.UUID(as_uuid=True), nullable=False),
+                    sa.Column('service_id', postgresql.UUID(as_uuid=True), nullable=False),
+                    sa.Column('notification_type',
+                              postgresql.ENUM(name='notification_type', create_type=False),
+                              nullable=False),
+                    sa.Column('days_of_retention', sa.Integer(), nullable=False),
+                    sa.Column('created_at', sa.DateTime(), nullable=False),
+                    sa.Column('updated_at', sa.DateTime(), nullable=True),
+                    sa.ForeignKeyConstraint(['service_id'], ['services.id'], ),
+                    sa.PrimaryKeyConstraint('id')
+                    )
+    op.create_index(op.f('ix_service_data_retention_service_id'), 'service_data_retention', ['service_id'],
+                    unique=False)
+
+
+def downgrade():
+    op.drop_index(op.f('ix_service_data_retention_service_id'), table_name='service_data_retention')
+    op.drop_table('service_data_retention')