disable deduplication based serverId+sender

only use the serverTimestamp+sender for searching because
serverId+sender might have false positive

app/sql.js

@@ -60,7 +60,6 @@ module.exports = {
   getUnreadByConversation,
   getUnreadCountByConversation,
   getMessageBySender,
-  getMessageBySenderAndServerId,
   getMessageBySenderAndServerTimestamp,
   getMessageBySenderAndTimestamp,
   getMessageIdsFromServerIds,
@@ -2058,21 +2057,6 @@ function getMessageBySender({ source, sourceDevice, sentAt }) {
   return map(rows, row => jsonToObject(row.json));
 }
 
-function getMessageBySenderAndServerId({ source, serverId }) {
-  const rows = globalInstance
-    .prepare(
-      `SELECT json FROM ${MESSAGES_TABLE} WHERE
-      source = $source AND
-      serverId = $serverId;`
-    )
-    .all({
-      source,
-      serverId,
-    });
-
-  return map(rows, row => jsonToObject(row.json));
-}
-
 function getMessageBySenderAndTimestamp({ source, timestamp }) {
   const rows = globalInstance
     .prepare(

ts/data/data.ts

@@ -110,7 +110,6 @@ const channelsToMake = {
   removeAllMessagesInConversation,
 
   getMessageBySender,
-  getMessageBySenderAndServerId,
   getMessageBySenderAndServerTimestamp,
   getMessageBySenderAndTimestamp,
   getMessageIdsFromServerIds,
@@ -690,24 +689,6 @@ export async function getMessageBySender({
   return new MessageModel(messages[0]);
 }
 
-export async function getMessageBySenderAndServerId({
-  source,
-  serverId,
-}: {
-  source: string;
-  serverId: number;
-}): Promise<MessageModel | null> {
-  const messages = await channels.getMessageBySenderAndServerId({
-    source,
-    serverId,
-  });
-  if (!messages || !messages.length) {
-    return null;
-  }
-
-  return new MessageModel(messages[0]);
-}
-
 export async function getMessageBySenderAndServerTimestamp({
   source,
   serverTimestamp,

ts/receiver/dataMessage.ts

@@ -12,11 +12,7 @@ import { getConversationController } from '../session/conversations';
 import { handleClosedGroupControlMessage } from './closedGroups';
 import { MessageModel } from '../models/message';
 import { MessageModelType } from '../models/messageType';
-import {
-  getMessageBySender,
-  getMessageBySenderAndServerId,
-  getMessageBySenderAndServerTimestamp,
-} from '../../ts/data/data';
+import { getMessageBySender, getMessageBySenderAndServerTimestamp } from '../../ts/data/data';
 import { ConversationModel, ConversationTypeEnum } from '../models/conversation';
 import { allowOnlyOneAtATime } from '../session/utils/Promise';
 import { toHex } from '../session/utils/String';
@@ -368,22 +364,14 @@ export async function isMessageDuplicate({
   try {
     let result;
     if (serverId || serverTimestamp) {
-      // first try to find a duplicate serverId from this sender
-      if (serverId) {
-        result = await getMessageBySenderAndServerId({
-          source,
-          serverId,
-        });
-      }
-      // if no result, try to find a duplicate with the same serverTimestamp from this sender
+      // first try to find a duplicate with the same serverTimestamp from this sender
       if (!result && serverTimestamp) {
         result = await getMessageBySenderAndServerTimestamp({
           source,
           serverTimestamp,
         });
       }
-      // if we have a result, it means a specific user sent two messages either with the same
-      // serverId or the same serverTimestamp.
+      // if we have a result, it means a specific user sent two messages either with the same serverTimestamp.
       // no need to do anything else, those messages must be the same
       // Note: this test is not based on which conversation the user sent the message
       // but we consider that a user sending two messages with the same serverTimestamp is unlikely