fix: make DB2 dev workflow work on Windows

apps/web/package.json

@@ -12,10 +12,10 @@
   },
   "scripts": {
     "dev": "vite",
-    "dev:api": "AUTH_REQUIRED=true APP_ENCRYPTION_KEY=${APP_ENCRYPTION_KEY:-0000000000000000000000000000000000000000000000000000000000000000} tsx watch src/backend/index.ts",
+    "dev:api": "cross-env AUTH_REQUIRED=true APP_ENCRYPTION_KEY=0000000000000000000000000000000000000000000000000000000000000000 tsx watch src/backend/index.ts",
     "dev:all": "concurrently -n api,web -c cyan,magenta \"npm run dev:api\" \"npm run dev\"",
-    "dev:auth": "AUTH_REQUIRED=true LOCAL_SINGLE_USER=false vite",
-    "dev:api:auth": "AUTH_REQUIRED=true LOCAL_SINGLE_USER=false APP_ENCRYPTION_KEY=${APP_ENCRYPTION_KEY:-0000000000000000000000000000000000000000000000000000000000000000} tsx watch src/backend/index.ts",
+    "dev:auth": "cross-env AUTH_REQUIRED=true LOCAL_SINGLE_USER=false vite",
+    "dev:api:auth": "cross-env AUTH_REQUIRED=true LOCAL_SINGLE_USER=false APP_ENCRYPTION_KEY=0000000000000000000000000000000000000000000000000000000000000000 tsx watch src/backend/index.ts",
     "dev:all:auth": "concurrently -n api,web -c cyan,magenta \"npm run dev:api:auth\" \"npm run dev:auth\"",
     "build": "tsc && vite build",
     "preview": "vite preview",
@@ -55,6 +55,7 @@
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^6.0.2",
     "concurrently": "^10.0.3",
+    "cross-env": "^7.0.3",
     "tsx": "^4.22.4",
     "vite": "^8.0.12"
   }

apps/web/src/frontend/api/schemaApi.ts

@@ -58,7 +58,22 @@ export function invalidateCache(prefix?: string): void {
 }
 
 async function parseJson<T>(res: Response): Promise<T> {
-  const data = (await res.json()) as T & { error?: string };
+  const text = await res.text();
+  if (!text.trim()) {
+    throw new Error(
+      res.status === 502 || res.status === 504 || res.type === 'opaque'
+        ? 'API server unreachable — run `npm run dev` from the repo root (starts both the API and UI).'
+        : `Empty response from server (${res.status} ${res.statusText || 'unknown'})`
+    );
+  }
+
+  let data: T & { error?: string };
+  try {
+    data = JSON.parse(text) as T & { error?: string };
+  } catch {
+    throw new Error(`Invalid response from server (${res.status}): ${text.slice(0, 200)}`);
+  }
+
   if (!res.ok) {
     throw new Error(
       typeof data === 'object' && data && 'error' in data && data.error

apps/web/src/frontend/lib/provider-settings.ts

@@ -86,13 +86,13 @@ const db2Settings: ProviderSettings = {
   label: 'IBM DB2',
   defaultPort: 50000,
   defaultSchema: '',
-  schemaRequired: false,
+  schemaRequired: true,
   buildConnectionString(o) {
     if (o.connectionString?.trim()) return o.connectionString.trim();
     const host = o.host || 'localhost';
     const port = o.port || this.defaultPort;
-    let cs = `DATABASE=${o.database || ''};HOSTNAME=${host};PORT=${port};PROTOCOL=TCPIP;UID=${o.username || ''};PWD=${o.password || ''};`;
-    if (o.schema) cs += `CurrentSchema=${o.schema};`;
+    let cs = `DATABASE=${o.database || ''};HOSTNAME=${host};PORT=${port};PROTOCOL=TCPIP;UID=${o.username || ''};PWD=${o.password || ''};Authentication=SERVER;`;
+    if (o.schema) cs += `CurrentSchema=${o.schema.toUpperCase()};`;
     return cs;
   },
 };

packages/core/src/cores/driver-detector.ts

@@ -1,6 +1,7 @@
 import { createRequire } from 'node:module';
 import type { DriverInfo } from '../interfaces';
 import { getAdapter, ADAPTERS } from '../providers/adapter-registry';
+import { setupDb2ClientEnv } from '../providers/db2/db2.env';
 
 const nodeRequire = createRequire(import.meta.url);
 
@@ -20,6 +21,10 @@ export class DriverDetector {
   }
 
   private static checkPackage(dialect: string, packageName: string): DriverInfo {
+    // ibm_db's native bindings need the bundled clidriver on PATH/LD_LIBRARY_PATH
+    // (especially on Windows) — same setup the DB2 adapter runs before open().
+    if (packageName === 'ibm_db') setupDb2ClientEnv();
+
     try {
       const mod = nodeRequire(packageName);
       return {