diff --git a/addons/im_livechat/static/src/core/thread_model_patch.js b/addons/im_livechat/static/src/core/thread_model_patch.js
index 669c8e16c0a..04799d2887e 100644
--- a/addons/im_livechat/static/src/core/thread_model_patch.js
+++ b/addons/im_livechat/static/src/core/thread_model_patch.js
@@ -2,13 +2,13 @@
 
 import { DEFAULT_AVATAR } from "@mail/core/common/persona_service";
 import { Thread } from "@mail/core/common/thread_model";
-import { assignDefined, createLocalId } from "@mail/utils/common/misc";
+import { assignDefined } from "@mail/utils/common/misc";
 
 import { patch } from "@web/core/utils/patch";
 
 patch(Thread, {
     insert(data) {
-        const isUnknown = !(createLocalId(data.model, data.id) in this.records);
+        const isUnknown = !this.get(data);
         const thread = super.insert(data);
         if (thread.type === "livechat") {
             if (data?.channel) {
diff --git a/addons/im_livechat/static/src/embed/core/thread_model_patch.js b/addons/im_livechat/static/src/embed/core/thread_model_patch.js
index f31bf185fd8..ced9c32999e 100644
--- a/addons/im_livechat/static/src/embed/core/thread_model_patch.js
+++ b/addons/im_livechat/static/src/embed/core/thread_model_patch.js
@@ -1,7 +1,7 @@
 /* @odoo-module */
 
 import { Thread } from "@mail/core/common/thread_model";
-import { createLocalId, onChange } from "@mail/utils/common/misc";
+import { onChange } from "@mail/utils/common/misc";
 
 import { patch } from "@web/core/utils/patch";
 import { session } from "@web/session";
@@ -9,7 +9,7 @@ import { SESSION_STATE } from "./livechat_service";
 
 patch(Thread, {
     insert(data) {
-        const isUnknown = !(createLocalId(data.model, data.id) in this.records);
+        const isUnknown = !this.get(data);
         const thread = super.insert(...arguments);
         const livechatService = this.env.services["im_livechat.livechat"];
         const chatbotService = this.env.services["im_livechat.chatbot"];
diff --git a/addons/mail/static/src/core/common/attachment_model.js b/addons/mail/static/src/core/common/attachment_model.js
index 6c23af992c6..25964f353f2 100644
--- a/addons/mail/static/src/core/common/attachment_model.js
+++ b/addons/mail/static/src/core/common/attachment_model.js
@@ -7,6 +7,7 @@ import { deserializeDateTime } from "@web/core/l10n/dates";
 import { url } from "@web/core/utils/urls";
 
 export class Attachment extends Record {
+    static id = "id";
     /** @type {Object.<number, Attachment>} */
     static records = {};
 
@@ -18,10 +19,11 @@ export class Attachment extends Record {
         if (!("id" in data)) {
             throw new Error("Cannot insert attachment: id is missing in data");
         }
-        let attachment = this.records[data.id];
+        let attachment = this.get(data);
         if (!attachment) {
-            this.records[data.id] = new Attachment();
-            attachment = this.records[data.id];
+            attachment = this.new(data);
+            this.records[attachment.localId] = attachment;
+            attachment = this.records[attachment.localId];
             Object.assign(attachment, { _store: this.store, id: data.id });
         }
         this.env.services["mail.attachment"].update(attachment, data);
diff --git a/addons/mail/static/src/core/common/attachment_service.js b/addons/mail/static/src/core/common/attachment_service.js
index 73f06033f03..9611b26c421 100644
--- a/addons/mail/static/src/core/common/attachment_service.js
+++ b/addons/mail/static/src/core/common/attachment_service.js
@@ -1,7 +1,7 @@
 /* @odoo-module */
 
 import { removeFromArrayWithPredicate } from "@mail/utils/common/arrays";
-import { assignDefined, createLocalId } from "@mail/utils/common/misc";
+import { assignDefined } from "@mail/utils/common/misc";
 
 import { registry } from "@web/core/registry";
 
@@ -46,7 +46,7 @@ export class AttachmentService {
                 model: threadData.model,
                 id: threadData.id,
             });
-            attachment.originThreadLocalId = createLocalId(threadData.model, threadData.id);
+            attachment.originThreadLocalId = this.store.Thread.localId(threadData);
             const thread = attachment.originThread;
             if (attachment.notIn(thread.attachments)) {
                 thread.attachments.push(attachment);
@@ -64,7 +64,7 @@ export class AttachmentService {
         if (attachment.tmpUrl) {
             URL.revokeObjectURL(attachment.tmpUrl);
         }
-        delete this.store.Attachment.records[attachment.id];
+        delete this.store.Attachment.records[attachment.localId];
         if (attachment.originThread) {
             removeFromArrayWithPredicate(attachment.originThread.attachments, (att) =>
                 att.eq(attachment)
diff --git a/addons/mail/static/src/core/common/attachment_upload_service.js b/addons/mail/static/src/core/common/attachment_upload_service.js
index df7768eb319..4fb09eec865 100644
--- a/addons/mail/static/src/core/common/attachment_upload_service.js
+++ b/addons/mail/static/src/core/common/attachment_upload_service.js
@@ -1,6 +1,5 @@
 /* @odoo-module */
 
-import { createLocalId } from "@mail/utils/common/misc";
 import { _t } from "@web/core/l10n/translation";
 import { registry } from "@web/core/registry";
 import { Deferred } from "@web/core/utils/concurrency";
@@ -83,8 +82,7 @@ export class AttachmentUploadService {
                 }
                 const threadId = parseInt(upload.data.get("thread_id"));
                 const threadModel = upload.data.get("thread_model");
-                const originThread =
-                    this.store.Thread.records[createLocalId(threadModel, threadId)];
+                const originThread = this.store.Thread.get({ model: threadModel, id: threadId });
                 const attachment = this.store.Attachment.insert({
                     ...response,
                     extension: upload.title.split(".").pop(),
@@ -99,7 +97,7 @@ export class AttachmentUploadService {
                     }
                 }
                 const def = this.deferredByAttachmentId.get(tmpId);
-                this.unlink(this.store.Attachment.records[tmpId]);
+                this.unlink(this.store.Attachment.get(tmpId));
                 if (def) {
                     def.resolve(attachment);
                     this.deferredByAttachmentId.delete(tmpId);
diff --git a/addons/mail/static/src/core/common/canned_response_model.js b/addons/mail/static/src/core/common/canned_response_model.js
index 5c9f858e25e..07cbc1e4456 100644
--- a/addons/mail/static/src/core/common/canned_response_model.js
+++ b/addons/mail/static/src/core/common/canned_response_model.js
@@ -3,6 +3,7 @@
 import { Record } from "@mail/core/common/record";
 
 export class CannedResponse extends Record {
+    static id = "id";
     /** @type {Object.<number, CannedResponse>} */
     static records = {};
     /**
@@ -10,10 +11,11 @@ export class CannedResponse extends Record {
      * @returns {CannedResponse}
      */
     static insert(data) {
-        let cannedResponse = this.records[data.id];
+        let cannedResponse = this.get(data);
         if (!cannedResponse) {
-            this.records[data.id] = new CannedResponse();
-            cannedResponse = this.records[data.id];
+            cannedResponse = this.new(data);
+            this.records[cannedResponse.localId] = cannedResponse;
+            cannedResponse = this.records[cannedResponse.localId];
         }
         Object.assign(cannedResponse, {
             id: data.id,
diff --git a/addons/mail/static/src/core/common/channel_member_model.js b/addons/mail/static/src/core/common/channel_member_model.js
index 4cddfb0f6cc..1e4532db078 100644
--- a/addons/mail/static/src/core/common/channel_member_model.js
+++ b/addons/mail/static/src/core/common/channel_member_model.js
@@ -1,7 +1,6 @@
 /* @odoo-module */
 
 import { Record } from "@mail/core/common/record";
-import { createLocalId } from "@mail/utils/common/misc";
 
 /**
  * @class ChannelMember
@@ -11,6 +10,7 @@ import { createLocalId } from "@mail/utils/common/misc";
  * @property {number} threadId
  */
 export class ChannelMember extends Record {
+    static id = "id";
     /** @type {Object.<number, ChannelMember>} */
     static records = {};
     /**
@@ -19,10 +19,11 @@ export class ChannelMember extends Record {
      */
     static insert(data) {
         const memberData = Array.isArray(data) ? data[1] : data;
-        let member = this.records[memberData.id];
+        let member = this.get(memberData);
         if (!member) {
-            this.records[memberData.id] = new ChannelMember();
-            member = this.records[memberData.id];
+            member = this.new(memberData);
+            this.records[member.localId] = member;
+            member = this.records[member.localId];
             member._store = this.store;
         }
         this.env.services["discuss.channel.member"].update(member, data);
@@ -46,11 +47,11 @@ export class ChannelMember extends Record {
     }
 
     get rtcSession() {
-        return this._store.RtcSession.records[this.rtcSessionId];
+        return this._store.RtcSession.get(this.rtcSessionId);
     }
 
     get thread() {
-        return this._store.Thread.records[createLocalId("discuss.channel", this.threadId)];
+        return this._store.Thread.get({ model: "discuss.channel", id: this.threadId });
     }
 
     /**
diff --git a/addons/mail/static/src/core/common/chat_window_model.js b/addons/mail/static/src/core/common/chat_window_model.js
index f18eac7b3f8..5b16ede3bac 100644
--- a/addons/mail/static/src/core/common/chat_window_model.js
+++ b/addons/mail/static/src/core/common/chat_window_model.js
@@ -8,6 +8,7 @@ import { _t } from "@web/core/l10n/translation";
 /** @typedef {{ thread?: import("@mail/core/common/thread_model").Thread, folded?: boolean, replaceNewMessageChatWindow?: boolean }} ChatWindowData */
 
 export class ChatWindow extends Record {
+    static id = "threadLocalId";
     /** @type {ChatWindow[]} */
     static records = [];
     /**
@@ -17,7 +18,7 @@ export class ChatWindow extends Record {
     static insert(data = {}) {
         const chatWindow = this.records.find((c) => c.threadLocalId === data.thread?.localId);
         if (!chatWindow) {
-            const chatWindow = new ChatWindow();
+            const chatWindow = this.new(data);
             Object.assign(chatWindow, {
                 thread: data.thread,
                 _store: this.store,
diff --git a/addons/mail/static/src/core/common/composer.js b/addons/mail/static/src/core/common/composer.js
index f746ea28b9a..8cf6ddd3281 100644
--- a/addons/mail/static/src/core/common/composer.js
+++ b/addons/mail/static/src/core/common/composer.js
@@ -554,8 +554,9 @@ export class Composer extends Component {
      * @param {postData} postData Message meta data info
      */
     async _sendMessage(value, postData) {
+        const thread = this.props.composer.thread;
         await this.threadService.post(this.thread, value, postData);
-        if (this.props.composer.thread.type === "mailbox") {
+        if (thread.type === "mailbox") {
             this.notifySendFromMailbox();
         }
         this.suggestion?.clearRawMentions();
diff --git a/addons/mail/static/src/core/common/composer_model.js b/addons/mail/static/src/core/common/composer_model.js
index 259e681e95e..ab73449bab5 100644
--- a/addons/mail/static/src/core/common/composer_model.js
+++ b/addons/mail/static/src/core/common/composer_model.js
@@ -1,12 +1,13 @@
 /* @odoo-module */
 
-import { Record } from "@mail/core/common/record";
+import { OR, Record } from "@mail/core/common/record";
 
 /**
  * @typedef {{partnerIds: Set<number>, threadIds: Set<number>}} RawMentions
  */
 
 export class Composer extends Record {
+    static id = OR("threadLocalId", "messageLocalId");
     /**
      * @param {Object} data
      * @returns {Composer}
@@ -18,7 +19,7 @@ export class Composer extends Record {
         }
         let composer = (thread ?? message)?.composer;
         if (!composer) {
-            composer = new Composer();
+            composer = this.new(data);
             const { message, thread } = data;
             if (thread) {
                 composer.thread = thread;
@@ -51,8 +52,8 @@ export class Composer extends Record {
 
     /** @type {import("@mail/core/common/attachment_model").Attachment[]} */
     attachments = [];
-    /** @type {import("@mail/core/common/message_model").Message} */
-    message;
+    /** @type {import("@mail/core/common/message_model").Message.localId} */
+    messageLocalId;
     /** @type {RawMentions} */
     rawMentions = {
         partnerIds: new Set(),
@@ -62,8 +63,8 @@ export class Composer extends Record {
     cannedResponseIds = new Set();
     /** @type {string} */
     textInputContent;
-    /** @type {import("@mail/core/common/thread_model").Thread */
-    thread;
+    /** @type {import("@mail/core/common/thread_model").Thread.localId} */
+    threadLocalId;
     /** @type {{ start: number, end: number, direction: "forward" | "backward" | "none"}}*/
     selection = {
         start: 0,
@@ -75,6 +76,26 @@ export class Composer extends Record {
     /** @type {import("@mail/core/common/store_service").Store} */
     _store;
     isFocused = false;
+
+    /** @type {import("@mail/core/common/message_model").Message} */
+    get message() {
+        return this._store.Message.records[this.messageLocalId];
+    }
+
+    /** @param {import("@mail/core/common/message_model").Message} */
+    set message(newMessage) {
+        this.messageLocalId = newMessage?.localId;
+    }
+
+    /** @type {import("@mail/core/common/thread_model").Thread} */
+    get thread() {
+        return this._store.Thread.records[this.threadLocalId];
+    }
+
+    /** @param {import("@mail/core/common/thread_model").Thread} */
+    set thread(newThread) {
+        this.threadLocalId = newThread?.localId;
+    }
 }
 
 Composer.register();
diff --git a/addons/mail/static/src/core/common/follower_model.js b/addons/mail/static/src/core/common/follower_model.js
index c38277d3305..fa0c0243f29 100644
--- a/addons/mail/static/src/core/common/follower_model.js
+++ b/addons/mail/static/src/core/common/follower_model.js
@@ -11,6 +11,7 @@ import { Record } from "@mail/core/common/record";
  */
 
 export class Follower extends Record {
+    static id = "id";
     /** @type {Object.<number, Follower>} */
     static records = {};
     /**
@@ -18,10 +19,11 @@ export class Follower extends Record {
      * @returns {Follower}
      */
     static insert(data) {
-        let follower = this.records[data.id];
+        let follower = this.get(data);
         if (!follower) {
-            this.records[data.id] = new Follower();
-            follower = this.records[data.id];
+            follower = this.new(data);
+            this.records[follower.localId] = follower;
+            follower = this.records[follower.localId];
         }
         Object.assign(follower, {
             followedThread: data.followedThread,
diff --git a/addons/mail/static/src/core/common/link_preview_model.js b/addons/mail/static/src/core/common/link_preview_model.js
index 7cf03e28b70..696810e37df 100644
--- a/addons/mail/static/src/core/common/link_preview_model.js
+++ b/addons/mail/static/src/core/common/link_preview_model.js
@@ -3,6 +3,7 @@
 import { Record } from "@mail/core/common/record";
 
 export class LinkPreview extends Record {
+    static id = "id";
     /**
      * @param {Object} data
      * @returns {LinkPreview}
@@ -12,9 +13,9 @@ export class LinkPreview extends Record {
         if (linkPreview) {
             return Object.assign(linkPreview, data);
         }
-        linkPreview = new LinkPreview();
+        linkPreview = this.new(data);
         Object.assign(linkPreview, data);
-        this.store.Message.records[data.message.id]?.linkPreviews.push(linkPreview);
+        this.store.Message.get(data.message.id)?.linkPreviews.push(linkPreview);
         return linkPreview;
     }
 
diff --git a/addons/mail/static/src/core/common/mail_core_common_service.js b/addons/mail/static/src/core/common/mail_core_common_service.js
index 6609961bf52..7551a29e42a 100644
--- a/addons/mail/static/src/core/common/mail_core_common_service.js
+++ b/addons/mail/static/src/core/common/mail_core_common_service.js
@@ -28,14 +28,14 @@ export class MailCoreCommon {
                 if (messageData) {
                     this.store.Message.insert({ ...messageData });
                 }
-                const attachment = this.store.Attachment.records[attachmentId];
+                const attachment = this.store.Attachment.get(attachmentId);
                 if (attachment) {
                     this.attachmentService.remove(attachment);
                 }
             });
             this.busService.subscribe("mail.link.preview/delete", (payload) => {
                 const { id, message_id } = payload;
-                const message = this.store.Message.records[message_id];
+                const message = this.store.Message.get(message_id);
                 if (message) {
                     removeFromArrayWithPredicate(
                         message.linkPreviews,
@@ -45,11 +45,11 @@ export class MailCoreCommon {
             });
             this.busService.subscribe("mail.message/delete", (payload) => {
                 for (const messageId of payload.message_ids) {
-                    const message = this.store.Message.records[messageId];
+                    const message = this.store.Message.get(messageId);
                     if (!message) {
                         continue;
                     }
-                    delete this.store.Message.records[messageId];
+                    delete this.store.Message.records[this.store.Message.localId(messageId)];
                     if (message.originThread) {
                         removeFromArrayWithPredicate(message.originThread.messages, (msg) =>
                             msg.eq(message)
@@ -100,14 +100,14 @@ export class MailCoreCommon {
                 const { LinkPreview: linkPreviews } = payload;
                 if (linkPreviews) {
                     for (const linkPreview of linkPreviews) {
-                        this.store.Message.records[linkPreview.message.id]?.linkPreviews.push(
+                        this.store.Message.get(linkPreview.message.id)?.linkPreviews.push(
                             this.store.LinkPreview.insert(linkPreview)
                         );
                     }
                 }
                 const { Message: messageData } = payload;
                 if (messageData) {
-                    const isStarred = this.store.Message.records[messageData.id]?.isStarred;
+                    const isStarred = this.store.Message.get(messageData.id)?.isStarred;
                     const message = this.store.Message.insert({
                         ...messageData,
                         body: messageData.body ? markup(messageData.body) : messageData.body,
diff --git a/addons/mail/static/src/core/common/message_model.js b/addons/mail/static/src/core/common/message_model.js
index a80995b6837..62963c68320 100644
--- a/addons/mail/static/src/core/common/message_model.js
+++ b/addons/mail/static/src/core/common/message_model.js
@@ -2,7 +2,6 @@
 
 import { Record } from "@mail/core/common/record";
 import { htmlToTextContentInline } from "@mail/utils/common/format";
-import { createLocalId } from "@mail/utils/common/misc";
 
 import { toRaw } from "@odoo/owl";
 
@@ -14,6 +13,7 @@ import { url } from "@web/core/utils/urls";
 const { DateTime } = luxon;
 
 export class Message extends Record {
+    static id = "id";
     /** @type {Object.<number, Message>} */
     static records = {};
     /**
@@ -28,13 +28,12 @@ export class Message extends Record {
                 id: data.res_id,
             });
         }
-        if (data.id in this.records) {
-            message = this.records[data.id];
-        } else {
-            message = new Message();
+        message = this.get(data);
+        if (!message) {
+            message = this.new(data);
             message._store = this.store;
-            this.records[data.id] = message;
-            message = this.records[data.id];
+            this.records[message.localId] = message;
+            message = this.records[message.localId];
         }
         this.env.services["mail.message"].update(message, data);
         // return reactive version
@@ -196,7 +195,7 @@ export class Message extends Record {
     }
 
     get originThread() {
-        return this._store.Thread.records[createLocalId(this.resModel, this.resId)];
+        return this._store.Thread.get({ model: this.resModel, id: this.resId });
     }
 
     get resUrl() {
diff --git a/addons/mail/static/src/core/common/message_reactions_model.js b/addons/mail/static/src/core/common/message_reactions_model.js
index 6374cc386cf..9944108b4bb 100644
--- a/addons/mail/static/src/core/common/message_reactions_model.js
+++ b/addons/mail/static/src/core/common/message_reactions_model.js
@@ -1,18 +1,19 @@
 /* @odoo-module */
 
-import { Record } from "@mail/core/common/record";
+import { AND, Record } from "@mail/core/common/record";
 
 export class MessageReactions extends Record {
+    static id = AND("messageId", "content");
     /**
      * @param {Object} data
      * @returns {MessageReactions}
      */
     static insert(data) {
-        let reaction = this.store.Message.records[data.message.id]?.reactions.find(
+        let reaction = this.store.Message.get(data.message.id)?.reactions.find(
             ({ content }) => content === data.content
         );
         if (!reaction) {
-            reaction = new MessageReactions();
+            reaction = this.new(data);
             reaction._store = this.store;
         }
         const personasToUnlink = new Set();
diff --git a/addons/mail/static/src/core/common/message_service.js b/addons/mail/static/src/core/common/message_service.js
index 738418ad20a..ea0db47998b 100644
--- a/addons/mail/static/src/core/common/message_service.js
+++ b/addons/mail/static/src/core/common/message_service.js
@@ -2,7 +2,7 @@
 
 import { removeFromArrayWithPredicate, replaceArrayWithCompare } from "@mail/utils/common/arrays";
 import { convertBrToLineBreak, prettifyMessageContent } from "@mail/utils/common/format";
-import { assignDefined, createLocalId } from "@mail/utils/common/misc";
+import { assignDefined } from "@mail/utils/common/misc";
 
 import { markup } from "@odoo/owl";
 
@@ -96,7 +96,7 @@ export class MessageService {
         const rawMentionedPartnerIds = rawMentions.partnerIds || [];
         const rawMentionedThreadIds = rawMentions.threadIds || [];
         for (const partnerId of rawMentionedPartnerIds) {
-            const partner = this.store.Persona.records[createLocalId("partner", partnerId)];
+            const partner = this.store.Persona.get({ type: "partner", id: partnerId });
             const index = body.indexOf(`@${partner.name}`);
             if (index === -1) {
                 continue;
@@ -104,7 +104,7 @@ export class MessageService {
             partners.push(partner);
         }
         for (const threadId of rawMentionedThreadIds) {
-            const thread = this.store.Thread.records[createLocalId("discuss.channel", threadId)];
+            const thread = this.store.Thread.get({ model: "discuss.channel", id: threadId });
             const index = body.indexOf(`#${thread.displayName}`);
             if (index === -1) {
                 continue;
diff --git a/addons/mail/static/src/core/common/notification_group_model.js b/addons/mail/static/src/core/common/notification_group_model.js
index 731cc6135e7..716afd79a7c 100644
--- a/addons/mail/static/src/core/common/notification_group_model.js
+++ b/addons/mail/static/src/core/common/notification_group_model.js
@@ -7,6 +7,7 @@ import { _t } from "@web/core/l10n/translation";
 
 let nextId = 1;
 export class NotificationGroup extends Record {
+    static id = "id";
     /** @type {NotificationGroup[]} */
     static records = [];
     /**
@@ -22,10 +23,10 @@ export class NotificationGroup extends Record {
             );
         });
         if (!group) {
-            group = new NotificationGroup();
-            group._store = this.store;
+            const id = nextId++;
+            group = this.new({ id });
+            Object.assign(group, { id, _store: this.store });
             this.store.NotificationGroup.records.push(group);
-            group.id = nextId++;
             // return reactive
             group = this.store.NotificationGroup.records.find((g) => g.eq(group));
         }
@@ -60,7 +61,7 @@ export class NotificationGroup extends Record {
     }
 
     get lastMessage() {
-        return this._store.Message.records[this.lastMessageId];
+        return this._store.Message.get(this.lastMessageId);
     }
 
     get datetime() {
diff --git a/addons/mail/static/src/core/common/notification_model.js b/addons/mail/static/src/core/common/notification_model.js
index 954e3448a4d..d2a92d7e744 100644
--- a/addons/mail/static/src/core/common/notification_model.js
+++ b/addons/mail/static/src/core/common/notification_model.js
@@ -5,6 +5,7 @@ import { Record } from "@mail/core/common/record";
 import { _t } from "@web/core/l10n/translation";
 
 export class Notification extends Record {
+    static id = "id";
     /** @type {Object.<number, Notification>} */
     static records = {};
     /**
@@ -12,15 +13,15 @@ export class Notification extends Record {
      * @returns {Notification}
      */
     static insert(data) {
-        let notification = this.records[data.id];
+        let notification = this.get(data);
         if (!notification) {
-            notification = new Notification();
-            this.records[data.id] = notification;
+            notification = this.new(data);
+            this.records[notification.localId] = notification;
             Object.assign(notification, {
                 id: data.id,
                 _store: this.store,
             });
-            notification = this.records[data.id];
+            notification = this.records[notification.localId];
         }
         this.env.services["mail.message"].updateNotification(notification, data);
         return notification;
@@ -42,7 +43,7 @@ export class Notification extends Record {
     _store;
 
     get message() {
-        return this._store.Message.records[this.messageId];
+        return this._store.Message.get(this.messageId);
     }
 
     get isFailure() {
diff --git a/addons/mail/static/src/core/common/persona_model.js b/addons/mail/static/src/core/common/persona_model.js
index 1e0fc073621..ac791c11685 100644
--- a/addons/mail/static/src/core/common/persona_model.js
+++ b/addons/mail/static/src/core/common/persona_model.js
@@ -1,7 +1,6 @@
 /* @odoo-module */
 
-import { Record } from "@mail/core/common/record";
-import { createLocalId } from "@mail/utils/common/misc";
+import { AND, Record } from "@mail/core/common/record";
 
 /**
  * @typedef {'offline' | 'bot' | 'online' | 'away' | 'im_partner' | undefined} ImStatus
@@ -14,6 +13,7 @@ import { createLocalId } from "@mail/utils/common/misc";
  */
 
 export class Persona extends Record {
+    static id = AND("type", "id");
     /** @type {Object.<number, Persona>} */
     static records = {};
     /**
@@ -21,17 +21,16 @@ export class Persona extends Record {
      * @returns {Persona}
      */
     static insert(data) {
-        const localId = createLocalId(data.type, data.id);
-        let persona = this.records[localId];
+        let persona = this.get(data);
         if (!persona) {
-            persona = new Persona();
+            persona = this.new(data);
             persona._store = this.store;
-            persona.localId = localId;
-            this.records[localId] = persona;
+            this.records[persona.localId] = persona;
+            persona = this.records[persona.localId];
         }
         this.env.services["mail.persona"].update(persona, data);
         // return reactive version
-        return this.records[localId];
+        return persona;
     }
 
     /** @type {string} */
diff --git a/addons/mail/static/src/core/common/record.js b/addons/mail/static/src/core/common/record.js
index c5189b2859e..01bc2a8b665 100644
--- a/addons/mail/static/src/core/common/record.js
+++ b/addons/mail/static/src/core/common/record.js
@@ -5,11 +5,71 @@ import { registry } from "@web/core/registry";
 
 export const modelRegistry = registry.category("discuss.model");
 
+const OR_SYM = Symbol("or");
+const AND_SYM = Symbol("and");
+
+export function AND(...args) {
+    return [AND_SYM, ...args];
+}
+export function OR(...args) {
+    return [OR_SYM, ...args];
+}
+
 export class Record {
+    static id;
     static records = {};
+    static get(data) {
+        return this.records[this.localId(data)];
+    }
+    static modelFromLocalId(localId) {
+        return localId.split(",")[0];
+    }
     static register() {
         modelRegistry.add(this.name, this);
     }
+    static localId(data) {
+        let idStr;
+        if (typeof data === "object") {
+            idStr = this._localId(this.id, data);
+        } else {
+            idStr = data; // non-object data => single id
+        }
+        return `${this.name},${idStr}`;
+    }
+    static _localId(expr, data, { brackets = false } = {}) {
+        if (!Array.isArray(expr)) {
+            return data[expr];
+        }
+        const vals = [];
+        for (let i = 1; i < expr.length; i++) {
+            vals.push(this._localId(expr[i], data, { brackets: true }));
+        }
+        let res = vals.join(expr[0] === OR_SYM ? " OR " : " AND ");
+        if (brackets) {
+            res = `(${res})`;
+        }
+        return res;
+    }
+    /**
+     * Technical attribute, DO NOT USE in business code.
+     * This class is almost equivalent to current class of model,
+     * except this is a function, so we can new() it, whereas
+     * `this` is not, because it's an object.
+     * (in order to comply with OWL reactivity)
+     *
+     * @type {typeof Record}
+     */
+    static Class;
+    /**
+     * This method is almost equivalent to new Class, except that it properly
+     * setup relational fields of model with get/set, @see Class
+     *
+     * @returns {Record}
+     */
+    static new(data) {
+        const obj = new this.Class();
+        return Object.assign(obj, { localId: this.localId(data) });
+    }
 
     /**
      * @param {Object} data
@@ -29,6 +89,9 @@ export class Record {
 
     /** @param {Record[]} list */
     in(list) {
+        if (!list) {
+            return false;
+        }
         return list.some((record) => record.eq(this));
     }
 
diff --git a/addons/mail/static/src/core/common/store_service.js b/addons/mail/static/src/core/common/store_service.js
index eda06a5e0a7..c6ab8ef2156 100644
--- a/addons/mail/static/src/core/common/store_service.js
+++ b/addons/mail/static/src/core/common/store_service.js
@@ -187,6 +187,7 @@ export const storeService = {
             // work-around: make an object whose prototype is the class, so that static props become
             // instance props.
             const entry = Object.assign(Object.create(Model), { env, store: res });
+            entry.Class = Model;
             entry.records = JSON.parse(JSON.stringify(Model.records));
             res[name] = entry;
         }
diff --git a/addons/mail/static/src/core/common/thread.js b/addons/mail/static/src/core/common/thread.js
index 8184c5023ce..6b30b468667 100644
--- a/addons/mail/static/src/core/common/thread.js
+++ b/addons/mail/static/src/core/common/thread.js
@@ -202,7 +202,7 @@ export class Thread extends Component {
         const { oeType, oeId } = ev.target.dataset;
         if (oeType === "highlight") {
             await this.env.messageHighlight?.highlightMessage(
-                this.store.Message.records[Number(oeId)],
+                this.store.Message.get(Number(oeId)),
                 this.props.thread
             );
         }
diff --git a/addons/mail/static/src/core/common/thread_icon.js b/addons/mail/static/src/core/common/thread_icon.js
index c5723935ed7..a7267c85ba0 100644
--- a/addons/mail/static/src/core/common/thread_icon.js
+++ b/addons/mail/static/src/core/common/thread_icon.js
@@ -1,7 +1,5 @@
 /* @odoo-module */
 
-import { createLocalId } from "@mail/utils/common/misc";
-
 import { useService } from "@web/core/utils/hooks";
 
 import { Component, useState } from "@odoo/owl";
@@ -26,8 +24,6 @@ export class ThreadIcon extends Component {
     }
 
     get chatPartner() {
-        return this.store.Persona.records[
-            createLocalId("partner", this.props.thread.chatPartnerId)
-        ];
+        return this.store.Persona.get({ type: "partner", id: this.props.thread.chatPartnerId });
     }
 }
diff --git a/addons/mail/static/src/core/common/thread_model.js b/addons/mail/static/src/core/common/thread_model.js
index 363a2c64ed6..df7945d45e8 100644
--- a/addons/mail/static/src/core/common/thread_model.js
+++ b/addons/mail/static/src/core/common/thread_model.js
@@ -1,8 +1,8 @@
 /* @odoo-module */
 
-import { Record } from "@mail/core/common/record";
+import { AND, Record } from "@mail/core/common/record";
 import { ScrollPosition } from "@mail/core/common/scroll_position";
-import { createLocalId, onChange } from "@mail/utils/common/misc";
+import { onChange } from "@mail/utils/common/misc";
 
 import { deserializeDateTime } from "@web/core/l10n/dates";
 import { _t } from "@web/core/l10n/translation";
@@ -22,8 +22,20 @@ import { Deferred } from "@web/core/utils/concurrency";
  */
 
 export class Thread extends Record {
+    static id = AND("model", "id");
     /** @type {Object.<string, Thread>} */
     static records = {};
+    /**
+     * @param {Thread.localId} localId
+     * @returns {string}
+     */
+    static localIdToActiveId(localId) {
+        if (!localId) {
+            return undefined;
+        }
+        // Transform "Thread,<model> AND <id>" to "<model>_<id>""
+        return localId.split(",").slice(1).join("_").replace(" AND ", "_");
+    }
     /**
      * @param {Object} data
      * @returns {Thread}
@@ -35,13 +47,12 @@ export class Thread extends Record {
         if (!("model" in data)) {
             throw new Error("Cannot insert thread: model is missing in data");
         }
-        const localId = createLocalId(data.model, data.id);
-        if (localId in this.records) {
-            const thread = this.records[localId];
+        let thread = this.get(data);
+        if (thread) {
             this.env.services["mail.thread"].update(thread, data);
             return thread;
         }
-        let thread = new Thread();
+        thread = this.new(data);
         Object.assign(thread, {
             id: data.id,
             model: data.model,
@@ -192,7 +203,7 @@ export class Thread extends Record {
     }
 
     get activeRtcSession() {
-        return this._store.RtcSession.records[this.activeRtcSessionId];
+        return this._store.RtcSession.get(this.activeRtcSessionId);
     }
 
     set activeRtcSession(session) {
@@ -263,7 +274,7 @@ export class Thread extends Record {
         if (this.type === "chat" && this.chatPartnerId) {
             return (
                 this.customName ||
-                this._store.Persona.records[createLocalId("partner", this.chatPartnerId)]
+                this._store.Persona.get({ type: "partner", id: this.chatPartnerId })
                     .nameOrDisplayName
             );
         }
@@ -329,10 +340,6 @@ export class Thread extends Record {
         return null;
     }
 
-    get localId() {
-        return createLocalId(this.model, this.id);
-    }
-
     get needactionCounter() {
         return this.isChatChannel ? this.message_unread_counter : this.message_needaction_counter;
     }
@@ -460,7 +467,7 @@ export class Thread extends Record {
     }
 
     get rtcInvitingSession() {
-        return this._store.RtcSession.records[this.invitingRtcSessionId];
+        return this._store.RtcSession.get(this.invitingRtcSessionId);
     }
 
     get hasNeedactionMessages() {
@@ -493,7 +500,7 @@ export class Thread extends Record {
         if (previousMessages.length === 0) {
             return false;
         }
-        return this._store.Message.records[Math.max(...previousMessages.map((m) => m.id))];
+        return this._store.Message.get(Math.max(...previousMessages.map((m) => m.id)));
     }
 }
 
diff --git a/addons/mail/static/src/core/common/thread_service.js b/addons/mail/static/src/core/common/thread_service.js
index 2303664b8c4..ab561942e13 100644
--- a/addons/mail/static/src/core/common/thread_service.js
+++ b/addons/mail/static/src/core/common/thread_service.js
@@ -8,7 +8,7 @@ import {
     replaceArrayWithCompare,
 } from "@mail/utils/common/arrays";
 import { prettifyMessageContent } from "@mail/utils/common/format";
-import { assignDefined, createLocalId, nullifyClearCommands } from "@mail/utils/common/misc";
+import { assignDefined, nullifyClearCommands } from "@mail/utils/common/misc";
 
 import { markup } from "@odoo/owl";
 
@@ -340,8 +340,7 @@ export class ThreadService {
         if (ids.length) {
             const previews = await this.orm.call("discuss.channel", "channel_fetch_preview", [ids]);
             for (const preview of previews) {
-                const thread =
-                    this.store.Thread.records[createLocalId("discuss.channel", preview.id)];
+                const thread = this.store.Thread.get({ model: "discuss.channel", id: preview.id });
                 const data = Object.assign(preview.last_message, {
                     body: markup(preview.last_message.body),
                 });
@@ -836,7 +835,7 @@ export class ThreadService {
                 tmpData.guestAuthor = this.store.self;
             }
             if (parentId) {
-                tmpData.parentMessage = this.store.Message.records[parentId];
+                tmpData.parentMessage = this.store.Message.get(parentId);
             }
             const prettyContent = await prettifyMessageContent(body, params.validMentions);
             const { emojis } = await loadEmoji();
@@ -865,7 +864,7 @@ export class ThreadService {
         const data = await this.rpc(this.getMessagePostRoute(thread), params);
         if (thread.type !== "chatter") {
             removeFromArrayWithPredicate(thread.messages, (msg) => msg.eq(tmpMsg));
-            delete this.store.Message.records[tmpMsg.id];
+            delete this.store.Message.records[this.store.Message.localId(tmpMsg.id)];
         }
         if (!data) {
             return;
diff --git a/addons/mail/static/src/core/web/activity_model.js b/addons/mail/static/src/core/web/activity_model.js
index 62e7c09bc23..ec2f9d0e3b7 100644
--- a/addons/mail/static/src/core/web/activity_model.js
+++ b/addons/mail/static/src/core/web/activity_model.js
@@ -34,6 +34,7 @@ import { assignDefined } from "@mail/utils/common/misc";
  */
 
 export class Activity extends Record {
+    static id = "id";
     /** @type {Object.<number, Activity>} */
     static records = {};
 
@@ -44,16 +45,16 @@ export class Activity extends Record {
      * @returns {Activity}
      */
     static insert(data, { broadcast = true } = {}) {
-        let activity = this.records[data.id];
+        let activity = this.get(data);
         if (!activity) {
-            activity = new Activity();
+            activity = this.new(data);
             Object.assign(activity, {
                 id: data.id,
                 _store: this.store,
             });
-            this.store.Activity.records[data.id] = activity;
+            this.records[activity.localId] = activity;
             // return reactive
-            activity = this.store.Activity.records[data.id];
+            activity = this.records[activity.localId];
         }
         if (data.request_partner_id) {
             data.request_partner_id = data.request_partner_id[0];
diff --git a/addons/mail/static/src/core/web/activity_service.js b/addons/mail/static/src/core/web/activity_service.js
index 1cee861c51a..4c72353a497 100644
--- a/addons/mail/static/src/core/web/activity_service.js
+++ b/addons/mail/static/src/core/web/activity_service.js
@@ -78,7 +78,7 @@ export class ActivityService {
     }
 
     delete(activity, { broadcast = true } = {}) {
-        delete this.store.Activity.records[activity.id];
+        delete this.store.Activity.records[this.store.Activity.localId(activity.id)];
         if (broadcast) {
             this.broadcastChannel?.postMessage({ type: "delete", payload: { id: activity.id } });
         }
diff --git a/addons/mail/static/src/core/web/discuss_client_action.js b/addons/mail/static/src/core/web/discuss_client_action.js
index 5ac0894d256..c2ab5cfc51d 100644
--- a/addons/mail/static/src/core/web/discuss_client_action.js
+++ b/addons/mail/static/src/core/web/discuss_client_action.js
@@ -6,7 +6,6 @@ import { Component, onWillStart, onWillUpdateProps, useState } from "@odoo/owl";
 
 import { registry } from "@web/core/registry";
 import { useService } from "@web/core/utils/hooks";
-import { createLocalId } from "@mail/utils/common/misc";
 
 /**
  * @typedef {Object} Props
@@ -45,7 +44,7 @@ export class DiscussClientAction extends Component {
         const rawActiveId =
             props.action.context.active_id ??
             props.action.params?.active_id ??
-            this.store.discuss.threadLocalId?.replace(",", "_") ??
+            this.store.Thread.localIdToActiveId(this.store.discuss.threadLocalId) ??
             "mail.box_inbox";
         const activeId =
             typeof rawActiveId === "number" ? `discuss.channel_${rawActiveId}` : rawActiveId;
@@ -54,10 +53,10 @@ export class DiscussClientAction extends Component {
             // legacy format (sent in old emails, shared links, ...)
             model = "discuss.channel";
         }
-        const activeThreadLocalId = createLocalId(model, id);
+        const activeThreadLocalId = this.store.Thread.localId({ model, id });
         if (activeThreadLocalId !== this.store.discuss.threadLocalId) {
             const thread =
-                this.store.Thread.records[createLocalId(model, id)] ??
+                this.store.Thread.get({ model, id }) ??
                 (await this.threadService.fetchChannel(parseInt(id)));
             if (!thread.is_pinned) {
                 await this.threadService.pin(thread);
diff --git a/addons/mail/static/src/core/web/mail_core_web_service.js b/addons/mail/static/src/core/web/mail_core_web_service.js
index 598a1aa271d..3ed0116d621 100644
--- a/addons/mail/static/src/core/web/mail_core_web_service.js
+++ b/addons/mail/static/src/core/web/mail_core_web_service.js
@@ -92,7 +92,7 @@ export class MailCoreWeb {
                     // Furthermore, server should not send back all messageIds marked as read
                     // but something like last read messageId or something like that.
                     // (just imagine you mark 1000 messages as read ... )
-                    const message = this.store.Message.records[messageId];
+                    const message = this.store.Message.get(messageId);
                     if (!message) {
                         continue;
                     }
diff --git a/addons/mail/static/src/core/web/messaging_menu.js b/addons/mail/static/src/core/web/messaging_menu.js
index b135451e731..ee61ce18190 100644
--- a/addons/mail/static/src/core/web/messaging_menu.js
+++ b/addons/mail/static/src/core/web/messaging_menu.js
@@ -3,7 +3,6 @@
 import { ImStatus } from "@mail/core/common/im_status";
 import { NotificationItem } from "@mail/core/web/notification_item";
 import { onExternalClick } from "@mail/utils/common/hooks";
-import { createLocalId } from "@mail/utils/common/misc";
 
 import { Component, useState } from "@odoo/owl";
 
@@ -64,10 +63,6 @@ export class MessagingMenu extends Component {
         }
     }
 
-    createLocalId(...args) {
-        return createLocalId(...args);
-    }
-
     /**
      * @param {'chat' | 'group'} tab
      * @returns Thread types matching the given tab.
diff --git a/addons/mail/static/src/core/web/thread_service_patch.js b/addons/mail/static/src/core/web/thread_service_patch.js
index 10ecff6ced0..8168d8adc76 100644
--- a/addons/mail/static/src/core/web/thread_service_patch.js
+++ b/addons/mail/static/src/core/web/thread_service_patch.js
@@ -2,7 +2,6 @@
 
 import { ThreadService, threadService } from "@mail/core/common/thread_service";
 import { parseEmail } from "@mail/js/utils";
-import { createLocalId } from "@mail/utils/common/misc";
 
 import { markup } from "@odoo/owl";
 
@@ -102,15 +101,15 @@ patch(ThreadService.prototype, {
         return result;
     },
     getThread(resModel, resId) {
-        const localId = createLocalId(resModel, resId);
-        if (localId in this.store.Thread.records) {
+        let thread = this.store.Thread.get({ model: resModel, id: resId });
+        if (thread) {
             if (resId === false) {
-                return this.store.Thread.records[localId];
+                return thread;
             }
             // to force a reload
-            this.store.Thread.records[localId].status = "new";
+            thread.status = "new";
         }
-        const thread = this.store.Thread.insert({
+        thread = this.store.Thread.insert({
             id: resId,
             model: resModel,
             type: "chatter",
@@ -215,7 +214,7 @@ patch(ThreadService.prototype, {
         } else {
             thread.followers.delete(follower);
         }
-        delete this.store.Follower.records[follower.id];
+        delete this.store.Follower.records[this.store.Follower.localId(follower.id)];
     },
     unpin(thread) {
         const chatWindow = this.store.ChatWindow.records.find(
diff --git a/addons/mail/static/src/discuss/call/common/call.js b/addons/mail/static/src/discuss/call/common/call.js
index ded249267d4..72f2d4f6f33 100644
--- a/addons/mail/static/src/discuss/call/common/call.js
+++ b/addons/mail/static/src/discuss/call/common/call.js
@@ -88,7 +88,7 @@ export class Call extends Component {
             for (const memberId of this.props.thread.invitedMemberIds) {
                 invitationCards.push({
                     key: "member_" + memberId,
-                    member: this.store.ChannelMember.records[memberId],
+                    member: this.store.ChannelMember.get(memberId),
                 });
             }
         }
diff --git a/addons/mail/static/src/discuss/call/common/rtc_service.js b/addons/mail/static/src/discuss/call/common/rtc_service.js
index f8cc429580d..6549014f750 100644
--- a/addons/mail/static/src/discuss/call/common/rtc_service.js
+++ b/addons/mail/static/src/discuss/call/common/rtc_service.js
@@ -3,7 +3,7 @@
 import { BlurManager } from "@mail/discuss/call/common/blur_manager";
 import { monitorAudio } from "@mail/discuss/call/common/media_monitoring";
 import { removeFromArray } from "@mail/utils/common/arrays";
-import { closeStream, createLocalId, onChange } from "@mail/utils/common/misc";
+import { closeStream, onChange } from "@mail/utils/common/misc";
 
 import { reactive } from "@odoo/owl";
 
@@ -771,7 +771,7 @@ export class Rtc {
         this.state.logs.clear();
         this.state.channel = channel;
         this.onThreadUpdate(this.state.channel, { rtcSessions, invitedMembers });
-        this.state.selfSession = this.store.RtcSession.records[sessionId];
+        this.state.selfSession = this.store.RtcSession.get(sessionId);
         this.state.iceServers = iceServers || DEFAULT_ICE_SERVERS;
         this.state.logs.set("channelId", this.state.channel?.id);
         this.state.logs.set("selfSessionId", this.state.selfSession?.id);
@@ -1393,16 +1393,16 @@ export class Rtc {
      * @param {import("@mail/discuss/call/common/rtc_session_model").id} id
      */
     deleteSession(id) {
-        const session = this.store.RtcSession.records[id];
+        const session = this.store.RtcSession.get(id);
         if (session) {
             if (this.state.selfSession && session.eq(this.state.selfSession)) {
                 this.endCall();
             }
-            delete this.store.Thread.records[createLocalId("discuss.channel", session.channelId)]
+            delete this.store.Thread.get({ model: "discuss.channel", id: session.channelId })
                 ?.rtcSessions[id];
             this.disconnect(session);
         }
-        delete this.store.RtcSession.records[id];
+        delete this.store.RtcSession.records[this.store.RtcSession.localId(id)];
     }
 
     /**
@@ -1464,7 +1464,7 @@ export class Rtc {
     }
 
     updateRtcSessions(channelId, sessionsData, command) {
-        const channel = this.store.Thread.records[createLocalId("discuss.channel", channelId)];
+        const channel = this.store.Thread.get({ model: "discuss.channel", id: channelId });
         if (!channel) {
             return;
         }
diff --git a/addons/mail/static/src/discuss/call/common/rtc_session_model.js b/addons/mail/static/src/discuss/call/common/rtc_session_model.js
index 7b58bfd64dc..d8754923653 100644
--- a/addons/mail/static/src/discuss/call/common/rtc_session_model.js
+++ b/addons/mail/static/src/discuss/call/common/rtc_session_model.js
@@ -1,9 +1,9 @@
 /* @odoo-module */
 
 import { Record } from "@mail/core/common/record";
-import { createLocalId } from "@mail/utils/common/misc";
 
 export class RtcSession extends Record {
+    static id = "id";
     /** @type {Object.<number, RtcSession>} */
     static records = {};
     /**
@@ -11,11 +11,9 @@ export class RtcSession extends Record {
      * @returns {number, RtcSession}
      */
     static insert(data) {
-        let session;
-        if (this.records[data.id]) {
-            session = this.records[data.id];
-        } else {
-            session = new RtcSession();
+        let session = this.get(data);
+        if (!session) {
+            session = this.new(data);
             session._store = this.store;
         }
         const { channelMember, ...remainingData } = data;
@@ -33,9 +31,9 @@ export class RtcSession extends Record {
                 channelMemberRecord.thread.rtcSessions[session.id] = session;
             }
         }
-        this.records[session.id] = session;
+        this.records[session.localId] = session;
         // return reactive version
-        return this.records[session.id];
+        return this.records[session.localId];
     }
 
     // Server data
@@ -79,11 +77,11 @@ export class RtcSession extends Record {
     logStep;
 
     get channelMember() {
-        return this._store.ChannelMember.records[this.channelMemberId];
+        return this._store.ChannelMember.get(this.channelMemberId);
     }
 
     get channel() {
-        return this._store.Thread.records[createLocalId("discuss.channel", this.channelId)];
+        return this._store.Thread.get({ model: "discuss.channel", id: this.channelId });
     }
 
     get isMute() {
diff --git a/addons/mail/static/src/discuss/core/common/discuss_core_common_service.js b/addons/mail/static/src/discuss/core/common/discuss_core_common_service.js
index 2bb92d0d546..97019173964 100644
--- a/addons/mail/static/src/discuss/core/common/discuss_core_common_service.js
+++ b/addons/mail/static/src/discuss/core/common/discuss_core_common_service.js
@@ -1,7 +1,6 @@
 /* @odoo-module */
 
 import { removeFromArrayWithPredicate } from "@mail/utils/common/arrays";
-import { createLocalId } from "@mail/utils/common/misc";
 
 import { markup, reactive } from "@odoo/owl";
 
@@ -50,7 +49,7 @@ export class DiscussCoreCommon {
             });
             this.busService.subscribe("discuss.channel/last_interest_dt_changed", (payload) => {
                 const { id, last_interest_dt } = payload;
-                const channel = this.store.Thread.records[createLocalId("discuss.channel", id)];
+                const channel = this.store.Thread.get({ model: "discuss.channel", id });
                 if (channel) {
                     this.threadService.update(channel, { last_interest_dt });
                     if (channel.type !== "channel") {
@@ -96,8 +95,10 @@ export class DiscussCoreCommon {
                 }
             });
             this.busService.subscribe("discuss.channel/transient_message", (payload) => {
-                const channel =
-                    this.store.Thread.records[createLocalId("discuss.channel", payload.res_id)];
+                const channel = this.store.Thread.get({
+                    model: "discuss.channel",
+                    id: payload.res_id,
+                });
                 const message = this.messageService.createTransient(
                     Object.assign(payload, { body: markup(payload.body) })
                 );
@@ -105,8 +106,7 @@ export class DiscussCoreCommon {
                 channel.transientMessages.push(message);
             });
             this.busService.subscribe("discuss.channel/unpin", (payload) => {
-                const thread =
-                    this.store.Thread.records[createLocalId("discuss.channel", payload.id)];
+                const thread = this.store.Thread.get({ model: "discuss.channel", id: payload.id });
                 if (thread) {
                     thread.is_pinned = false;
                     this.notificationService.add(
@@ -117,8 +117,7 @@ export class DiscussCoreCommon {
             });
             this.busService.subscribe("discuss.channel.member/fetched", (payload) => {
                 const { channel_id, last_message_id, partner_id } = payload;
-                const channel =
-                    this.store.Thread.records[createLocalId("discuss.channel", channel_id)];
+                const channel = this.store.Thread.get({ model: "discuss.channel", id: channel_id });
                 if (channel) {
                     const seenInfo = channel.seenInfos.find(
                         (seenInfo) => seenInfo.partner.id === partner_id
@@ -130,8 +129,7 @@ export class DiscussCoreCommon {
             });
             this.busService.subscribe("discuss.channel.member/seen", (payload) => {
                 const { channel_id, last_message_id, partner_id } = payload;
-                const channel =
-                    this.store.Thread.records[createLocalId("discuss.channel", channel_id)];
+                const channel = this.store.Thread.get({ model: "discuss.channel", id: channel_id });
                 if (!channel) {
                     // for example seen from another browser, the current one has no
                     // knowledge of the channel
@@ -216,7 +214,7 @@ export class DiscussCoreCommon {
 
     async _handleNotificationNewMessage(notif) {
         const { id, message: messageData } = notif.payload;
-        let channel = this.store.Thread.records[createLocalId("discuss.channel", id)];
+        let channel = this.store.Thread.get({ model: "discuss.channel", id });
         if (!channel || !channel.type) {
             const [channelData] = await this.rpc("/discuss/channel/info", { channel_id: id });
             channel = this.store.Thread.insert({
@@ -229,7 +227,7 @@ export class DiscussCoreCommon {
             this.threadService.pin(channel);
         }
         removeFromArrayWithPredicate(channel.messages, ({ id }) => id === messageData.temporary_id);
-        delete this.store.Message.records[messageData.temporary_id];
+        delete this.store.Message.records[this.store.Message.localId(messageData.temporary_id)];
         messageData.temporary_id = null;
         if ("parentMessage" in messageData && messageData.parentMessage.body) {
             messageData.parentMessage.body = markup(messageData.parentMessage.body);
diff --git a/addons/mail/static/src/discuss/core/web/channel_selector.js b/addons/mail/static/src/discuss/core/web/channel_selector.js
index f7434c96b6b..f6358cd69e0 100644
--- a/addons/mail/static/src/discuss/core/web/channel_selector.js
+++ b/addons/mail/static/src/discuss/core/web/channel_selector.js
@@ -2,7 +2,6 @@
 
 import { NavigableList } from "@mail/core/common/navigable_list";
 import { cleanTerm } from "@mail/utils/common/format";
-import { createLocalId } from "@mail/utils/common/misc";
 
 import { Component, onMounted, useEffect, useRef, useState } from "@odoo/owl";
 
@@ -231,7 +230,7 @@ export class ChannelSelector extends Component {
     get tagsList() {
         const res = [];
         for (const partnerId of this.state.selectedPartners) {
-            const partner = this.store.Persona.records[createLocalId("partner", partnerId)];
+            const partner = this.store.Persona.get({ type: "partner", id: partnerId });
             res.push({
                 id: partner.id,
                 text: partner.name,
diff --git a/addons/mail/static/src/discuss/core/web/discuss_core_web_service.js b/addons/mail/static/src/discuss/core/web/discuss_core_web_service.js
index 87af64b1274..af9a855930c 100644
--- a/addons/mail/static/src/discuss/core/web/discuss_core_web_service.js
+++ b/addons/mail/static/src/discuss/core/web/discuss_core_web_service.js
@@ -1,6 +1,5 @@
 /* @odoo-module */
 
-import { createLocalId } from "@mail/utils/common/misc";
 import { reactive } from "@odoo/owl";
 
 import { _t } from "@web/core/l10n/translation";
@@ -87,7 +86,7 @@ export class DiscussCoreWeb {
         this.busService.subscribe("mail.record/insert", async (payload) => {
             if (payload.Thread) {
                 const data = payload.Thread;
-                const thread = this.store.Thread.records[createLocalId(data.model, data.id)];
+                const thread = this.store.Thread.get(data);
                 if (data.serverFoldState && thread && data.serverFoldState !== thread.state) {
                     thread.state = data.serverFoldState;
                     if (thread.state === "closed") {
diff --git a/addons/mail/static/src/utils/common/misc.js b/addons/mail/static/src/utils/common/misc.js
index 92cdbba480d..f536bc0b39a 100644
--- a/addons/mail/static/src/utils/common/misc.js
+++ b/addons/mail/static/src/utils/common/misc.js
@@ -2,10 +2,6 @@
 
 import { reactive } from "@odoo/owl";
 
-export function createLocalId(...args) {
-    return args.join(",");
-}
-
 export function nullifyClearCommands(data) {
     for (const key in data) {
         if (!Array.isArray(data[key])) {
diff --git a/addons/mail/static/tests/discuss/core/channel_member_list_tests.js b/addons/mail/static/tests/discuss/core/channel_member_list_tests.js
index 2f5502c5002..6a02bc5248e 100644
--- a/addons/mail/static/tests/discuss/core/channel_member_list_tests.js
+++ b/addons/mail/static/tests/discuss/core/channel_member_list_tests.js
@@ -1,6 +1,5 @@
 /* @odoo-module */
 
-import { createLocalId } from "@mail/utils/common/misc";
 import { Command } from "@mail/../tests/helpers/command";
 import { click, contains, start, startServer } from "@mail/../tests/helpers/test_utils";
 
@@ -174,8 +173,10 @@ QUnit.test("Channel member count update after user left", async (assert) => {
     });
     const { env, openDiscuss } = await start();
     openDiscuss(channelId);
-    const thread =
-        env.services["mail.store"].Thread.records[createLocalId("discuss.channel", channelId)];
+    const thread = env.services["mail.store"].Thread.get({
+        model: "discuss.channel",
+        id: channelId,
+    });
     assert.strictEqual(thread.memberCount, 2);
     await pyEnv.withUser(userId, () =>
         env.services.orm.call("discuss.channel", "action_unfollow", [channelId])
diff --git a/addons/mail/static/tests/discuss_app/im_status_tests.js b/addons/mail/static/tests/discuss_app/im_status_tests.js
index 2cba00149df..88d6ddae50e 100644
--- a/addons/mail/static/tests/discuss_app/im_status_tests.js
+++ b/addons/mail/static/tests/discuss_app/im_status_tests.js
@@ -2,7 +2,6 @@
 
 import { UPDATE_BUS_PRESENCE_DELAY } from "@bus/im_status_service";
 
-import { createLocalId } from "@mail/utils/common/misc";
 import { Command } from "@mail/../tests/helpers/command";
 import { click, contains, start, startServer } from "@mail/../tests/helpers/test_utils";
 
@@ -93,7 +92,7 @@ QUnit.test("Can handle im_status of unknown partner", async (assert) => {
         Partner: { im_status: "online", id: partnerId },
     });
     await nextTick();
-    const persona = env.services["mail.store"].Persona.records[createLocalId("partner", partnerId)];
+    const persona = env.services["mail.store"].Persona.get({ type: "partner", id: partnerId });
     assert.ok(persona);
     assert.ok(persona.im_status === "online");
 });