fix: make radio migrations safe for existing schemas

scripts/db-url.ts

@@ -0,0 +1,7 @@
+const MYSQL2_UNSUPPORTED_OPTIONS = ["connection_limit", "pool_timeout"] as const;
+
+export function mysqlConnectionUrl(value: string): string {
+  const url = new URL(value);
+  for (const option of MYSQL2_UNSUPPORTED_OPTIONS) url.searchParams.delete(option);
+  return url.toString();
+}