seo: improve metadata base and sitemap resilience

Co-authored-by: dennis <dennis@konkol.net>

lib/sitemap.ts

@@ -1,6 +1,7 @@
 import { prisma } from "@/lib/prisma";
 import { locales } from "@/i18n/locales";
 import { getBaseUrl } from "@/lib/seo";
+import { PrismaClientKnownRequestError } from "@prisma/client/runtime/library";
 
 export type SitemapEntry = {
   url: string;
@@ -49,11 +50,20 @@ export async function getSitemapEntries(): Promise<SitemapEntry[]> {
   );
 
   // Projects: for each project slug we publish per locale (same slug)
-  const projects = await prisma.project.findMany({
-    where: { published: true },
-    select: { slug: true, updatedAt: true },
-    orderBy: { updatedAt: "desc" },
-  });
+  let projects: Array<{ slug: string; updatedAt: Date | null }> = [];
+  try {
+    projects = await prisma.project.findMany({
+      where: { published: true },
+      select: { slug: true, updatedAt: true },
+      orderBy: { updatedAt: "desc" },
+    });
+  } catch (error) {
+    // If DB isn't ready/migrated yet, still serve a valid sitemap for static pages.
+    if (error instanceof PrismaClientKnownRequestError && (error.code === "P2021" || error.code === "P2022")) {
+      return staticEntries;
+    }
+    throw error;
+  }
 
   const projectEntries: SitemapEntry[] = projects.flatMap((p) => {
     const lastModified = (p.updatedAt ?? new Date()).toISOString();