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.agents/skills/cloudflare-deploy/references/do-storage/configuration.md

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+# DO Storage Configuration
+
+## SQLite-backed (Recommended)
+
+**wrangler.jsonc:**
+```jsonc
+{
+  "migrations": [
+    {
+      "tag": "v1",
+      "new_sqlite_classes": ["Counter", "Session", "RateLimiter"]
+    }
+  ]
+}
+```
+
+**Migration lifecycle:** Migrations run once per deployment. Existing DO instances get new storage backend on next invocation. Renaming/removing classes requires `renamed_classes` or `deleted_classes` entries.
+
+## KV-backed (Legacy)
+
+**wrangler.jsonc:**
+```jsonc
+{
+  "migrations": [
+    {
+      "tag": "v1",
+      "new_classes": ["OldCounter"]
+    }
+  ]
+}
+```
+
+## TypeScript Setup
+
+```typescript
+export class MyDurableObject extends DurableObject {
+  sql: SqlStorage;
+  
+  constructor(ctx: DurableObjectState, env: Env) {
+    super(ctx, env);
+    this.sql = ctx.storage.sql;
+    
+    // Initialize schema
+    this.sql.exec(`
+      CREATE TABLE IF NOT EXISTS users(
+        id INTEGER PRIMARY KEY,
+        name TEXT NOT NULL,
+        email TEXT UNIQUE
+      );
+    `);
+  }
+}
+
+// Binding
+interface Env {
+  MY_DO: DurableObjectNamespace;
+}
+
+export default {
+  async fetch(request: Request, env: Env): Promise<Response> {
+    const id = env.MY_DO.idFromName('singleton');
+    const stub = env.MY_DO.get(id);
+    
+    // Modern RPC: call methods directly (recommended)
+    const result = await stub.someMethod();
+    return Response.json(result);
+    
+    // Legacy: forward request (still works)
+    // return stub.fetch(request);
+  }
+}
+```
+
+## CPU Limits
+
+```jsonc
+{
+  "limits": {
+    "cpu_ms": 300000  // 5 minutes (default 30s)
+  }
+}
+```
+
+## Location Control
+
+```typescript
+// Jurisdiction (GDPR/FedRAMP)
+const euNamespace = env.MY_DO.jurisdiction("eu");
+const id = euNamespace.newUniqueId();
+const stub = euNamespace.get(id);
+
+// Location hint (best effort)
+const stub = env.MY_DO.get(id, { locationHint: "enam" });
+// Hints: wnam, enam, sam, weur, eeur, apac, oc, afr, me
+```
+
+## Initialization
+
+```typescript
+export class Counter extends DurableObject {
+  value: number;
+  
+  constructor(ctx: DurableObjectState, env: Env) {
+    super(ctx, env);
+    
+    // Block concurrent requests during init
+    ctx.blockConcurrencyWhile(async () => {
+      this.value = (await ctx.storage.get("value")) || 0;
+    });
+  }
+}
+```