simplify production database configuration

backend/internal/postgres/open.go

@@ -42,7 +42,7 @@ func Open(ctx context.Context, config Config) (*Module, error) {
 		poolConfig.ConnConfig.Fallbacks = nil
 	case SSLVerifyFull:
 		if config.TLSConfig == nil {
-			return nil, fmt.Errorf("TLS configuration is required when DATABASE_SSL_MODE=verify-full")
+			return nil, fmt.Errorf("TLS configuration is required when DATABASE_URL sslmode=verify-full")
 		}
 		tlsConfig := config.TLSConfig.Clone()
 		if tlsConfig.ServerName == "" {
@@ -51,7 +51,7 @@ func Open(ctx context.Context, config Config) (*Module, error) {
 		poolConfig.ConnConfig.TLSConfig = tlsConfig
 		poolConfig.ConnConfig.Fallbacks = nil
 	default:
-		return nil, fmt.Errorf("unsupported DATABASE_SSL_MODE %q", config.SSLMode)
+		return nil, fmt.Errorf("unsupported DATABASE_URL sslmode %q", config.SSLMode)
 	}
 	pool, err := pgxpool.NewWithConfig(ctx, poolConfig)
 	if err != nil {