refactor(go): simplify identity table keys

go/vehicle-gateway/internal/identity/resolver_test.go

@@ -3,6 +3,7 @@ package identity
 import (
 	"context"
 	"database/sql"
+	"strings"
 	"testing"
 
 	"github.com/DATA-DOG/go-sqlmock"
@@ -202,6 +203,24 @@ func TestMySQLResolverEnsuresMinimalIdentitySchema(t *testing.T) {
 	}
 }
 
+func TestIdentitySchemaUsesBusinessKeysOnly(t *testing.T) {
+	binding := identityBindingTableSQL("vehicle_identity_binding")
+	registration := jt808RegistrationTableSQL
+	for _, sqlText := range []string{binding, registration} {
+		for _, column := range []string{"id BIGINT", "AUTO_INCREMENT", "created_at"} {
+			if strings.Contains(sqlText, column) {
+				t.Fatalf("identity schema should not contain %s:\n%s", column, sqlText)
+			}
+		}
+	}
+	if !strings.Contains(binding, "vin VARCHAR(32) PRIMARY KEY") {
+		t.Fatalf("binding table should key by vin:\n%s", binding)
+	}
+	if !strings.Contains(registration, "phone VARCHAR(32) PRIMARY KEY") {
+		t.Fatalf("registration table should key by phone:\n%s", registration)
+	}
+}
+
 func newMockDB(t *testing.T) (*sql.DB, sqlmock.Sqlmock) {
 	t.Helper()
 	db, mock, err := sqlmock.New()