AeroCommerce / CSV / API product update fails when updating variant prices: unknown column prices.product_tax_group_id

Environment: api 0.10.1, core 0.52.2, csv 0.4.4 Steps to reproduce: * Have existing product with variant and price row in prices table. * PUT product update including variants.prices payload (CSV import does this automatically for existing Model). * Observe SQLSTATE 42S22 unknown column product_tax_group_id in SET on prices update. Expected: * Variant price updates should not attempt to persist a non-existent prices column. Actual: * Update path writes product_tax_group_id and fails. Code references: * UpdatePrices.php:62 * UpdatePrices.php:106 * 2018_08_07_000036_create_prices_table.php:16