fix most type errors

still have a few things outstanding

helpers/mail.ts

@@ -12,7 +12,7 @@ if (!SENDGRID_API_KEY) {
   throw new Error('NO SENDGRID_API_KEY set!')
 }
 
-async function sendMail(data) {
+async function sendMail(data: object) {
   const fetchOptions = {
     method: 'POST',
     headers: {
@@ -24,13 +24,11 @@ async function sendMail(data) {
   const response = await fetch(SENDGRID_URL, fetchOptions)
 
   if (!response.ok) {
-    throw new Error(
-      `Failed to send booking ${data._id} to booking admin with status ${response.status}: ${response.statusText}`
-    )
+    throw new Error(`Unable to send mail`)
   }
 }
 
-function getReceivedBookingText(booking) {
+function getReceivedBookingText(booking: { uuid: string }) {
   return `Hallo lieber Admin,
 
   es ging folgende Buchung ein: https://${process.env.VERCEL_URL}/booking/${booking.uuid}
@@ -38,7 +36,7 @@ function getReceivedBookingText(booking) {
   MfG`
 }
 
-export async function sendReceivedBookingMail(booking) {
+export async function sendReceivedBookingMail(booking: { uuid: string }) {
   const data = {
     personalizations: [
       {
@@ -46,9 +44,13 @@ export async function sendReceivedBookingMail(booking) {
       },
     ],
     from: { email: FROM_EMAIL },
-    subject: 'Pfadi Bussle - Buchung eingegangen!',
+    subject: `Pfadi Bussle - Buchung ${booking.uuid} eingegangen!`,
     content: [{ type: 'text/plain', value: getReceivedBookingText(booking) }],
   }
 
-  await sendMail(data)
+  try {
+    await sendMail(data)
+  } catch (error) {
+    console.error(`Failed in sendReceivedBookingMail for ${booking.uuid}`)
+  }
 }