Update migration

src/fides/api/alembic/migrations/versions/4ebe0766021b_add_connection_type_to_dataset_namespace.py

@@ -19,13 +19,22 @@
 def upgrade():
     # Populate the connection_type field in the namespace meta for all datasets
     # that have a namespace key in their fides_meta json field.
-    # We use bigquery as the initial value since only datasets generated from
-    # BigQuery monitors will have a namespace key in their fides_meta json field.
+
+    # If the namespace dict has a project_id key, we know it's a BigQuery dataset.
     op.execute(
         """
         update ctl_datasets
         set fides_meta = jsonb_set(fides_meta::jsonb, '{namespace, connection_type}', '"bigquery"', true)
-        where fides_meta::jsonb ? 'namespace';
+        where (fides_meta::jsonb ? 'namespace') and ((fides_meta::jsonb ->> 'namespace')::jsonb ? 'project_id');
+        """
+    )
+
+    # If the namespace dict has a database_instance_id, we know it's an RDS MySQL dataset.
+    op.execute(
+        """
+        update ctl_datasets
+        set fides_meta = jsonb_set(fides_meta::jsonb, '{namespace, connection_type}', '"rds_mysql"', true)
+        where (fides_meta::jsonb ? 'namespace') and ((fides_meta::jsonb ->> 'namespace')::jsonb ? 'database_instance_id');
         """
     )