fix

internal/data/migrations.go

@@ -1,9 +1,13 @@
 package data
 
-import "gorm.io/gorm"
+import (
+	"fmt"
+
+	"gorm.io/gorm"
+)
 
 func migrateAll(db *gorm.DB) error {
-	return db.AutoMigrate(
+	if err := db.AutoMigrate(
 		&userPO{}, &authorityPO{}, &menuPO{}, &userAuthorityPO{}, &authorityMenuPO{}, &menuParameterPO{},
 		&apiPO{}, &ignoredAPIPO{}, &authorityAPIPO{}, &menuButtonPO{}, &authorityButtonPO{},
 		&departmentPO{}, &positionPO{}, &userDepartmentPO{}, &userPositionPO{}, &authorityDepartmentPO{},
@@ -12,5 +16,66 @@ func migrateAll(db *gorm.DB) error {
 		&operationPO{}, &loginLogPO{}, &dataAccessLogPO{}, &errorRecordPO{},
 		&taskPO{}, &taskLogPO{}, &mediaPO{}, &categoryPO{}, &uploadSessionPO{}, &uploadChunkPO{},
 		&announcementPO{},
-	)
+	); err != nil {
+		return err
+	}
+	return reconcileReferenceIndexes(db)
+}
+
+// reconcileReferenceIndexes removes constraints created by older Kra builds
+// that are not part of the administration data model. Business services own
+// duplicate checks and their user-facing error messages.
+func reconcileReferenceIndexes(db *gorm.DB) error {
+	obsolete := []struct {
+		model any
+		name  string
+	}{
+		{&apiPO{}, "idx_api_path_method"},
+		{&dictionaryPO{}, "idx_sys_dictionaries_type"},
+		{&parameterPO{}, "idx_sys_params_key"},
+		{&apiTokenPO{}, "idx_sys_api_tokens_token"},
+		{&exportTemplatePO{}, "idx_sys_export_templates_template_id"},
+	}
+	for _, item := range obsolete {
+		if db.Migrator().HasIndex(item.model, item.name) {
+			if err := db.Migrator().DropIndex(item.model, item.name); err != nil {
+				return fmt.Errorf("drop obsolete index %s: %w", item.name, err)
+			}
+		}
+	}
+	for _, item := range []struct {
+		name  string
+		field string
+	}{{"idx_sys_users_uuid", "UUID"}, {"idx_sys_users_username", "Username"}} {
+		unique, err := indexIsUnique(db, &userPO{}, item.name)
+		if err != nil {
+			return err
+		}
+		if !unique {
+			continue
+		}
+		if err = db.Migrator().DropIndex(&userPO{}, item.name); err != nil {
+			return fmt.Errorf("drop legacy unique index %s: %w", item.name, err)
+		}
+		if err = db.Migrator().CreateIndex(&userPO{}, item.field); err != nil {
+			return fmt.Errorf("create reference index %s: %w", item.name, err)
+		}
+	}
+	return nil
+}
+
+func indexIsUnique(db *gorm.DB, model any, name string) (bool, error) {
+	indexes, err := db.Migrator().GetIndexes(model)
+	if err != nil {
+		// Some third-party GORM drivers do not implement index inspection.
+		// Fresh schemas are already correct; skip only the legacy repair there.
+		return false, nil
+	}
+	for _, index := range indexes {
+		if index.Name() == name {
+			unique, known := index.Unique()
+			return known && unique, nil
+		}
+	}
+	return false, nil
 }