Add endpoint for managing notification text in settings

app/api/settings/notification_text/route.ts

@@ -0,0 +1,34 @@
+import { NextResponse, NextRequest } from "next/server";
+import { prisma } from "@/lib/prisma";
+
+interface AddRequest {
+    text: string;
+}
+
+export async function POST(request: NextRequest) {
+    try {
+        const body: AddRequest = await request.json();
+        const { text } = body;  
+        
+        // Check if there is already a settings entry
+        const existingSettings = await prisma.settings.findFirst();
+        if (existingSettings) {
+            // Update the existing settings entry
+            const updatedSettings = await prisma.settings.update({
+                where: { id: existingSettings.id },
+                data: { notification_text: text },
+            });
+            return NextResponse.json({ message: "Success", updatedSettings });
+        }
+        // If no settings entry exists, create a new one
+        const settings = await prisma.settings.create({
+            data: {
+                notification_text: text,
+            }
+        });
+
+        return NextResponse.json({ message: "Success", settings });
+    } catch (error: any) {
+        return NextResponse.json({ error: error.message }, { status: 500 });
+    }
+}