remove showEmail from transaction link model, alter database version

backend/src/config/index.ts

@@ -10,7 +10,7 @@ Decimal.set({
 })
 
 const constants = {
-  DB_VERSION: '0030-transaction_link',
+  DB_VERSION: '0031-remove_sendEmail_from_transaction_link',
   DECAY_START_TIME: new Date('2021-05-13 17:46:31'), // GMT+0
 }
 

backend/src/graphql/model/TransactionLink.ts

@@ -31,9 +31,6 @@ export class TransactionLink {
   @Field(() => Date)
   validUntil: Date
 
-  @Field(() => Boolean)
-  showEmail: boolean
-
   @Field(() => Date, { nullable: true })
   redeemedAt: Date | null