diff --git a/app/api/shots/[shotId]/route.ts b/app/api/shots/[shotId]/route.ts
index d0b0f5d..b69a076 100644
--- a/app/api/shots/[shotId]/route.ts
+++ b/app/api/shots/[shotId]/route.ts
@@ -82,7 +82,7 @@ export async function GET(
     session.user.role as string
   );
 
-  // Serialize BigInt fields (fileSize) so JSON.stringify doesn't throw
+  // Serialize BigInt fields (fileSize, highResSize) so JSON.stringify doesn't throw
   const shotSerialized = {
     ...shot,
     footagePlates: shot.footagePlates.map((p) => ({
@@ -92,6 +92,7 @@ export async function GET(
     versions: shot.versions.map((v) => ({
       ...v,
       fileSize: v.fileSize != null ? v.fileSize.toString() : null,
+      highResSize: v.highResSize != null ? v.highResSize.toString() : null,
     })),
   };
 
diff --git a/lib/db.ts b/lib/db.ts
index 9bb9ce6..7752e14 100644
--- a/lib/db.ts
+++ b/lib/db.ts
@@ -1,5 +1,25 @@
 import { PrismaClient } from "@prisma/client";
 
+// Safety net: Prisma returns BigInt columns (fileSize, highResSize, …) as
+// BigInt, which JSON.stringify refuses — one such column anywhere in an API
+// response turns the whole route into a 500. Serialize them as strings, the
+// same shape the routes that convert them by hand already produce. Routes
+// that spread whole rows into NextResponse.json are then safe by default.
+declare global {
+  interface BigInt {
+    toJSON(): string;
+  }
+}
+if (!("toJSON" in BigInt.prototype)) {
+  Object.defineProperty(BigInt.prototype, "toJSON", {
+    value: function toJSON(this: bigint) {
+      return this.toString();
+    },
+    writable: true,
+    configurable: true,
+  });
+}
+
 const globalForPrisma = globalThis as unknown as {
   prisma: PrismaClient | undefined;
 };