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diff --git a/addons/mail/static/src/models/thread_partner_seen_info/thread_partner_seen_info.js b/addons/mail/static/src/models/thread_partner_seen_info/thread_partner_seen_info.js
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+++ b/addons/mail/static/src/models/thread_partner_seen_info/thread_partner_seen_info.js
@@ -0,0 +1,109 @@
+odoo.define('mail/static/src/models/thread_partner_seen_info/thread_partner_seen_info.js', function (require) {
+'use strict';
+
+const { registerNewModel } = require('mail/static/src/model/model_core.js');
+const { attr, many2one } = require('mail/static/src/model/model_field.js');
+
+function factory(dependencies) {
+
+    class ThreadPartnerSeenInfo extends dependencies['mail.model'] {
+
+        //----------------------------------------------------------------------
+        // Private
+        //----------------------------------------------------------------------
+
+        /**
+         * @override
+         */
+        static _createRecordLocalId(data) {
+            const { channelId, partnerId } = data;
+            return `${this.modelName}_${channelId}_${partnerId}`;
+        }
+
+        /**
+         * @private
+         * @returns {mail.partner|undefined}
+         */
+        _computePartner() {
+            return [['insert', { id: this.partnerId }]];
+        }
+
+        /**
+         * @private
+         * @returns {mail.thread|undefined}
+         */
+        _computeThread() {
+            return [['insert', {
+                id: this.channelId,
+                model: 'mail.channel',
+            }]];
+        }
+
+    }
+
+    ThreadPartnerSeenInfo.modelName = 'mail.thread_partner_seen_info';
+
+    ThreadPartnerSeenInfo.fields = {
+        /**
+         * The id of channel this seen info is related to.
+         *
+         * Should write on this field to set relation between the channel and
+         * this seen info, not on `thread`.
+         *
+         * Reason for not setting the relation directly is the necessity to
+         * uniquely identify a seen info based on channel and partner from data.
+         * Relational data are list of commands, which is problematic to deduce
+         * identifying records.
+         *
+         * TODO: task-2322536 (normalize relational data) & task-2323665
+         * (required fields) should improve and let us just use the relational
+         * fields.
+         */
+        channelId: attr(),
+        lastFetchedMessage: many2one('mail.message'),
+        lastSeenMessage: many2one('mail.message'),
+        /**
+         * Partner that this seen info is related to.
+         *
+         * Should not write on this field to update relation, and instead
+         * should write on @see partnerId field.
+         */
+        partner: many2one('mail.partner', {
+            compute: '_computePartner',
+            dependencies: ['partnerId'],
+        }),
+        /**
+         * The id of partner this seen info is related to.
+         *
+         * Should write on this field to set relation between the partner and
+         * this seen info, not on `partner`.
+         *
+         * Reason for not setting the relation directly is the necessity to
+         * uniquely identify a seen info based on channel and partner from data.
+         * Relational data are list of commands, which is problematic to deduce
+         * identifying records.
+         *
+         * TODO: task-2322536 (normalize relational data) & task-2323665
+         * (required fields) should improve and let us just use the relational
+         * fields.
+         */
+        partnerId: attr(),
+        /**
+         * Thread (channel) that this seen info is related to.
+         *
+         * Should not write on this field to update relation, and instead
+         * should write on @see channelId field.
+         */
+        thread: many2one('mail.thread', {
+            compute: '_computeThread',
+            dependencies: ['channelId'],
+            inverse: 'partnerSeenInfos',
+        }),
+    };
+
+    return ThreadPartnerSeenInfo;
+}
+
+registerNewModel('mail.thread_partner_seen_info', factory);
+
+});