first commit

demos/preview/src/middleware.ts

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+/**
+ * Preview middleware
+ *
+ * Validates signed preview URLs, creates DO-backed sessions,
+ * populates snapshots, and overrides the request-context DB.
+ */
+
+import { createPreviewMiddleware } from "@emdashcms/cloudflare/db/do";
+import { sequence } from "astro:middleware";
+
+const preview = createPreviewMiddleware({
+	binding: "PREVIEW_DB",
+	secret: import.meta.env.PREVIEW_SECRET,
+});
+
+export const onRequest = sequence(preview);