test(sub2): migration verification SQL (Task 6)

docs/superpowers/tests/2026-04-21-sub2-migration-verify.sql

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+-- Sub 2 — Post-migration verification. Run on local dev DB after upgrade.
+-- Every SELECT should return 0 rows (anomalies). If any return > 0, migration has gaps.
+
+-- 1. No part should have an empty part_number
+SELECT id, name FROM fp_part_catalog
+WHERE (part_number IS NULL OR part_number = '') AND active = TRUE;
+
+-- 2. No part should have an empty revision
+SELECT id, name, part_number FROM fp_part_catalog
+WHERE (revision IS NULL OR revision = '') AND active = TRUE;
+
+-- 3. Every description-template row with text in `description` should have
+--    both internal_description and customer_facing_description populated
+SELECT id, name FROM fp_sale_description_template
+WHERE description IS NOT NULL
+  AND description <> ''
+  AND (
+      internal_description IS NULL OR internal_description = ''
+      OR customer_facing_description IS NULL OR customer_facing_description = ''
+  );
+
+-- 4. Every SO line with a non-empty `name` should have x_fc_internal_description set
+SELECT id, order_id FROM sale_order_line
+WHERE (name IS NOT NULL AND name <> '')
+  AND (x_fc_internal_description IS NULL OR x_fc_internal_description = '');
+
+-- 5. Every part should have certificate_requirement set (default 'inherit')
+SELECT id, name FROM fp_part_catalog
+WHERE certificate_requirement IS NULL;
+
+-- 6. Count summary (informational)
+SELECT 'parts_total' AS metric, COUNT(*) AS value FROM fp_part_catalog
+UNION ALL
+SELECT 'parts_inherit_cert', COUNT(*) FROM fp_part_catalog WHERE certificate_requirement = 'inherit'
+UNION ALL
+SELECT 'description_templates_total', COUNT(*) FROM fp_sale_description_template
+UNION ALL
+SELECT 'description_templates_with_both', COUNT(*) FROM fp_sale_description_template
+    WHERE internal_description IS NOT NULL AND customer_facing_description IS NOT NULL
+UNION ALL
+SELECT 'so_lines_with_internal_desc', COUNT(*) FROM sale_order_line
+    WHERE x_fc_internal_description IS NOT NULL AND x_fc_internal_description <> '';