Add DELETED_MULTISIG_TRANSACTION event

- Depends on safe-global/safe-transaction-service#1810

README.md

@@ -60,6 +60,17 @@ Some parameters are common to every event:
 }
 ```
 
+## Multisig transaction deleted
+
+```json
+{
+  "address": "<Ethereum checksummed address>",
+  "type": "DELETED_MULTISIG_TRANSACTION",
+  "safeTxHash": "<0x-prefixed-hex-string>",
+  "chainId": "<stringified-int>"
+}
+```
+
 ### Incoming Ether
 
 ```json

src/routes/events/event.dto.ts

@@ -10,7 +10,8 @@ export type TxServiceEventType =
   | 'OUTGOING_ETHER'
   | 'OUTGOING_TOKEN'
   | 'MESSAGE_CREATED'
-  | 'MESSAGE_CONFIRMATION';
+  | 'MESSAGE_CONFIRMATION'
+  | 'DELETED_MULTISIG_TRANSACTION';
 
 export interface TxServiceEvent {
   chainId: string;

src/routes/webhook/entities/webhook.entity.spec.ts

@@ -65,6 +65,13 @@ describe('Webhook entity', () => {
     expect(webhook.isEventRelevant(txServiceEvent)).toBe(false);
   });
 
+  it('DELETED_MULTISIG_TRANSACTION should not be relevant if sendMultisigTxs is disabled', async () => {
+    txServiceEvent.type = 'DELETED_MULTISIG_TRANSACTION' as TxServiceEventType;
+    expect(webhook.isEventRelevant(txServiceEvent)).toBe(true);
+    webhook.sendMultisigTxs = false;
+    expect(webhook.isEventRelevant(txServiceEvent)).toBe(false);
+  });
+
   it('INCOMING_ETHER should not be relevant if sendEtherTransfers is disabled', async () => {
     txServiceEvent.type = 'INCOMING_ETHER' as TxServiceEventType;
     expect(webhook.isEventRelevant(txServiceEvent)).toBe(true);

src/routes/webhook/entities/webhook.entity.ts

@@ -58,7 +58,8 @@ export class Webhook extends BaseEntity {
           message.type === 'CONFIRMATION_REQUEST')) ||
         (this.sendMultisigTxs &&
           (message.type === 'PENDING_MULTISIG_TRANSACTION' ||
-            message.type === 'EXECUTED_MULTISIG_TRANSACTION')) ||
+            message.type === 'EXECUTED_MULTISIG_TRANSACTION' ||
+            message.type === 'DELETED_MULTISIG_TRANSACTION')) ||
         (this.sendEtherTransfers &&
           (message.type === 'INCOMING_ETHER' ||
             message.type === 'OUTGOING_ETHER')) ||