init push

migrations/20260519_lands_land_iso_code_unique.sql

@@ -0,0 +1,22 @@
+-- +goose Up
+ALTER TABLE lands
+  ADD UNIQUE KEY uq_lands_land_iso_code (land_iso_code);
+
+-- +goose Down
+SET @idx_exists := (
+  SELECT COUNT(1)
+  FROM information_schema.statistics
+  WHERE table_schema = DATABASE()
+    AND table_name = 'lands'
+    AND index_name = 'uq_lands_land_iso_code'
+);
+
+SET @drop_sql := IF(
+  @idx_exists > 0,
+  'ALTER TABLE lands DROP INDEX uq_lands_land_iso_code',
+  'SELECT 1'
+);
+
+PREPARE stmt FROM @drop_sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;