added vendors table

prisma/schema.prisma

@@ -41,6 +41,8 @@ model Event {
     createdAt   DateTime @default(now())
 
     FileUpload FileUpload[]
+
+    vendors Vendor[]
 }
 
 model Venue {
@@ -155,8 +157,8 @@ model Vendor {
     contactPerson   String?
     email           String?
     phone           String?
-    address         Address     @relation(fields: [addressId], references: [id])
-    addressId       String
+    address         Address?     @relation(fields: [addressId], references: [id])
+    addressId       String?
 
     status          VendorStatus    @default(CONTACTING)
     isBooked        Boolean     @default(false)
@@ -169,7 +171,7 @@ model Vendor {
     finalPaymentDue DateTime?
     paymentNotes    String?
 
-    contactUrl      String?
+    contractUrl      String?
     proposalUrl     String?
     notes           String?
 
@@ -184,7 +186,8 @@ model Address {
     city            String
     state           String
     zip             Int
-    Vendor          Vendor[]
+
+    vendors Vendor[]
 }
 
 model Category {