Product Image Switcher 1.0.0 uses schema version 1.

The module creates no module-specific tables. Its interaction settings and schema
version are stored through ModuleManager's existing sys_variable settings service
under the product-image-switcher.* prefix.

No primary image, thumbnail, image URL, product record, customer record, or
visitor data is copied into ModuleManager storage. All images and image URLs are
rendered and owned by the host website or shopping cart.