fix(backend): secure production startup and migrations

backend/internal/testutil/postgres_integration_test.go

@@ -0,0 +1,20 @@
+//go:build integration
+
+package testutil
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestPostgresSchemaDSNSupportsURLAndKeywordFormats(t *testing.T) {
+	urlDSN, err := postgresSchemaDSN("postgres://user:pass@localhost:5432/db?sslmode=disable", "senlin_test_abc")
+	require.NoError(t, err)
+	require.Contains(t, urlDSN, "sslmode=disable")
+	require.Contains(t, urlDSN, "search_path=senlin_test_abc")
+
+	keywordDSN, err := postgresSchemaDSN("host=localhost dbname=db sslmode=disable", "senlin_test_abc")
+	require.NoError(t, err)
+	require.Equal(t, "host=localhost dbname=db sslmode=disable search_path=senlin_test_abc", keywordDSN)
+}