diff --git a/plugins/chat/app/jobs/regular/chat/notify_mentioned.rb b/plugins/chat/app/jobs/regular/chat/notify_mentioned.rb
index 3388d17973a..bfbd925ff5d 100644
--- a/plugins/chat/app/jobs/regular/chat/notify_mentioned.rb
+++ b/plugins/chat/app/jobs/regular/chat/notify_mentioned.rb
@@ -122,7 +122,7 @@ module Jobs
             read: is_read,
           )
 
-        mention.update!(notification: notification)
+        mention.notifications << notification
       end
 
       def send_notifications(membership, mention_type)
diff --git a/plugins/chat/app/models/chat/mention.rb b/plugins/chat/app/models/chat/mention.rb
index ab3bbee9925..9e89dd23b3e 100644
--- a/plugins/chat/app/models/chat/mention.rb
+++ b/plugins/chat/app/models/chat/mention.rb
@@ -3,10 +3,14 @@
 module Chat
   class Mention < ActiveRecord::Base
     self.table_name = "chat_mentions"
+    self.ignored_columns = ["notification_id"]
 
     belongs_to :user
     belongs_to :chat_message, class_name: "Chat::Message"
-    belongs_to :notification, dependent: :destroy
+    has_many :mention_notifications,
+             class_name: "Chat::MentionNotification",
+             foreign_key: :chat_mention_id
+    has_many :notifications, through: :mention_notifications, dependent: :destroy
   end
 end
 
diff --git a/plugins/chat/app/models/chat/mention_notification.rb b/plugins/chat/app/models/chat/mention_notification.rb
new file mode 100644
index 00000000000..62c3a254341
--- /dev/null
+++ b/plugins/chat/app/models/chat/mention_notification.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+module Chat
+  class MentionNotification < ActiveRecord::Base
+    self.table_name = "chat_mention_notifications"
+
+    belongs_to :chat_mention
+    belongs_to :notification, dependent: :destroy
+  end
+end
+
+# == Schema Information
+#
+# Table name: chat_mention_notifications
+#
+#  chat_mention_id    :integer    not null
+#  notification_id    :integer    not null
+#
+# Indexes
+#
+#  index_chat_mention_notifications_on_chat_mention_id  (chat_mention_id)
+#  index_chat_mention_notifications_on_notification_id  (notification_id) UNIQUE
+#
diff --git a/plugins/chat/app/services/chat/action/mark_mentions_read.rb b/plugins/chat/app/services/chat/action/mark_mentions_read.rb
index 8d0207d63bb..f6c3f1c2a4d 100644
--- a/plugins/chat/app/services/chat/action/mark_mentions_read.rb
+++ b/plugins/chat/app/services/chat/action/mark_mentions_read.rb
@@ -17,7 +17,12 @@ module Chat
           .where(notification_type: Notification.types[:chat_mention])
           .where(user: user)
           .where(read: false)
-          .joins("INNER JOIN chat_mentions ON chat_mentions.notification_id = notifications.id")
+          .joins(
+            "INNER JOIN chat_mention_notifications ON chat_mention_notifications.notification_id = notifications.id",
+          )
+          .joins(
+            "INNER JOIN chat_mentions ON chat_mentions.id = chat_mention_notifications.chat_mention_id",
+          )
           .joins("INNER JOIN chat_messages ON chat_mentions.chat_message_id = chat_messages.id")
           .where("chat_messages.chat_channel_id IN (?)", channel_ids)
           .then do |notifications|
diff --git a/plugins/chat/app/services/chat/trash_message.rb b/plugins/chat/app/services/chat/trash_message.rb
index 2d3b6d7a6c5..fa06c1e68ae 100644
--- a/plugins/chat/app/services/chat/trash_message.rb
+++ b/plugins/chat/app/services/chat/trash_message.rb
@@ -55,9 +55,13 @@ module Chat
     end
 
     def destroy_notifications(message:, **)
-      ids = Chat::Mention.where(chat_message: message).pluck(:notification_id)
-      Notification.where(id: ids).destroy_all
-      Chat::Mention.where(chat_message: message).update_all(notification_id: nil)
+      Notification.where(
+        id:
+          Chat::Mention
+            .where(chat_message: message)
+            .joins(:notifications)
+            .select("notifications.id"),
+      ).destroy_all
     end
 
     def update_tracking_state(message:, **)
diff --git a/plugins/chat/db/migrate/20231214180000_add_chat_mention_notifications.rb b/plugins/chat/db/migrate/20231214180000_add_chat_mention_notifications.rb
new file mode 100644
index 00000000000..6683a0441cb
--- /dev/null
+++ b/plugins/chat/db/migrate/20231214180000_add_chat_mention_notifications.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class AddChatMentionNotifications < ActiveRecord::Migration[7.0]
+  def change
+    create_table :chat_mention_notifications, id: false do |t|
+      t.integer :chat_mention_id, null: false
+      t.integer :notification_id, null: false
+    end
+
+    add_index :chat_mention_notifications, %i[chat_mention_id]
+    add_index :chat_mention_notifications, %i[notification_id], unique: true
+  end
+end
diff --git a/plugins/chat/db/migrate/20231214180001_update_relationship_between_chat_mentions_and_notifications.rb b/plugins/chat/db/migrate/20231214180001_update_relationship_between_chat_mentions_and_notifications.rb
new file mode 100644
index 00000000000..c90359201fa
--- /dev/null
+++ b/plugins/chat/db/migrate/20231214180001_update_relationship_between_chat_mentions_and_notifications.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class UpdateRelationshipBetweenChatMentionsAndNotifications < ActiveRecord::Migration[7.0]
+  disable_ddl_transaction!
+  BATCH_SIZE = 5000
+
+  def up
+    begin
+      inserted_count = DB.exec(<<~SQL, batch_size: BATCH_SIZE)
+        INSERT INTO chat_mention_notifications(chat_mention_id, notification_id)
+        SELECT cm.id, cm.notification_id
+        FROM chat_mentions cm
+        LEFT JOIN chat_mention_notifications cmn ON cmn.chat_mention_id = cm.id
+        WHERE cm.notification_id IS NOT NULL and cmn.chat_mention_id IS NULL
+        LIMIT :batch_size;
+      SQL
+    end while inserted_count > 0
+  end
+
+  def down
+  end
+end
diff --git a/plugins/chat/db/post_migrate/20231214180002_update_relationship_between_chat_mentions_and_notifications_post_migrate.rb b/plugins/chat/db/post_migrate/20231214180002_update_relationship_between_chat_mentions_and_notifications_post_migrate.rb
new file mode 100644
index 00000000000..858f51557e2
--- /dev/null
+++ b/plugins/chat/db/post_migrate/20231214180002_update_relationship_between_chat_mentions_and_notifications_post_migrate.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+class UpdateRelationshipBetweenChatMentionsAndNotificationsPostMigrate < ActiveRecord::Migration[
+  7.0
+]
+  disable_ddl_transaction!
+  BATCH_SIZE = 5000
+
+  def up
+    begin
+      inserted_count = DB.exec(<<~SQL, batch_size: BATCH_SIZE)
+        INSERT INTO chat_mention_notifications(chat_mention_id, notification_id)
+        SELECT cm.id, cm.notification_id
+        FROM chat_mentions cm
+        LEFT JOIN chat_mention_notifications cmn ON cmn.chat_mention_id = cm.id
+        WHERE cm.notification_id IS NOT NULL and cmn.chat_mention_id IS NULL
+        LIMIT :batch_size;
+      SQL
+    end while inserted_count > 0
+  end
+
+  def down
+  end
+end
diff --git a/plugins/chat/lib/chat/notifier.rb b/plugins/chat/lib/chat/notifier.rb
index 45cfbcc1535..fae9241230c 100644
--- a/plugins/chat/lib/chat/notifier.rb
+++ b/plugins/chat/lib/chat/notifier.rb
@@ -85,7 +85,8 @@ module Chat
       already_notified_user_ids =
         Chat::Mention
           .where(chat_message: @chat_message)
-          .where.not(notification: nil)
+          .left_outer_joins(:notifications)
+          .where.not(notifications: { id: nil })
           .pluck(:user_id)
 
       to_notify, inaccessible, all_mentioned_user_ids = list_users_to_notify
diff --git a/plugins/chat/lib/chat/user_notifications_extension.rb b/plugins/chat/lib/chat/user_notifications_extension.rb
index 383997277c1..ec1907feec4 100644
--- a/plugins/chat/lib/chat/user_notifications_extension.rb
+++ b/plugins/chat/lib/chat/user_notifications_extension.rb
@@ -11,9 +11,8 @@ module Chat
           .joins(:user, :chat_channel)
           .where.not(user: user)
           .where("chat_messages.created_at > ?", 1.week.ago)
-          .joins(
-            "LEFT OUTER JOIN chat_mentions cm ON cm.chat_message_id = chat_messages.id AND cm.notification_id IS NOT NULL",
-          )
+          .joins("LEFT OUTER JOIN chat_mentions cm ON cm.chat_message_id = chat_messages.id")
+          .joins("LEFT OUTER JOIN chat_mention_notifications cmn ON cmn.chat_mention_id = cm.id")
           .joins(
             "INNER JOIN user_chat_channel_memberships uccm ON uccm.chat_channel_id = chat_channels.id",
           )
@@ -22,7 +21,7 @@ module Chat
           (uccm.last_read_message_id IS NULL OR chat_messages.id > uccm.last_read_message_id) AND
           (uccm.last_unread_mention_when_emailed_id IS NULL OR chat_messages.id > uccm.last_unread_mention_when_emailed_id) AND
           (
-            (cm.user_id = :user_id AND uccm.following IS true AND chat_channels.chatable_type = 'Category') OR
+            (cm.user_id = :user_id AND cmn.notification_id IS NOT NULL AND uccm.following IS true AND chat_channels.chatable_type = 'Category') OR
             (chat_channels.chatable_type = 'DirectMessage')
           )
         SQL
diff --git a/plugins/chat/spec/jobs/regular/chat/channel_delete_spec.rb b/plugins/chat/spec/jobs/regular/chat/channel_delete_spec.rb
index e8ea19cd1c9..6e48a4e0f92 100644
--- a/plugins/chat/spec/jobs/regular/chat/channel_delete_spec.rb
+++ b/plugins/chat/spec/jobs/regular/chat/channel_delete_spec.rb
@@ -26,7 +26,7 @@ describe Jobs::Chat::ChannelDelete do
     Chat::Mention.create(
       user: user2,
       chat_message: messages.sample,
-      notification: Fabricate(:notification),
+      notifications: [Fabricate(:notification)],
     )
 
     @incoming_chat_webhook_id = Fabricate(:incoming_chat_webhook, chat_channel: chat_channel)
diff --git a/plugins/chat/spec/jobs/regular/chat/notify_mentioned_spec.rb b/plugins/chat/spec/jobs/regular/chat/notify_mentioned_spec.rb
index 2d02fe176d4..3cde7483515 100644
--- a/plugins/chat/spec/jobs/regular/chat/notify_mentioned_spec.rb
+++ b/plugins/chat/spec/jobs/regular/chat/notify_mentioned_spec.rb
@@ -282,10 +282,6 @@ describe Jobs::Chat::NotifyMentioned do
       expect(data_hash[:is_direct_message_channel]).to eq(false)
       expect(data_hash[:chat_channel_title]).to eq(expected_channel_title)
       expect(data_hash[:chat_channel_slug]).to eq(public_channel.slug)
-
-      chat_mention =
-        Chat::Mention.where(notification: created_notification, user: user_2, chat_message: message)
-      expect(chat_mention).to be_present
     end
   end
 
diff --git a/plugins/chat/spec/mailers/user_notifications_spec.rb b/plugins/chat/spec/mailers/user_notifications_spec.rb
index 236d15b7d47..183e1618f00 100644
--- a/plugins/chat/spec/mailers/user_notifications_spec.rb
+++ b/plugins/chat/spec/mailers/user_notifications_spec.rb
@@ -257,7 +257,7 @@ describe UserNotifications do
               :chat_mention,
               user: user,
               chat_message: chat_message,
-              notification: notification,
+              notifications: [notification],
             )
           end
 
@@ -310,7 +310,7 @@ describe UserNotifications do
               :chat_mention,
               user: user,
               chat_message: another_chat_message,
-              notification: notification,
+              notifications: [notification],
             )
             another_chat_channel.update!(last_message: another_chat_message)
 
@@ -350,7 +350,7 @@ describe UserNotifications do
                 :chat_mention,
                 user: user,
                 chat_message: another_chat_message,
-                notification: notification,
+                notifications: [notification],
               )
               another_chat_channel.update!(last_message: another_chat_message)
             end
@@ -379,7 +379,7 @@ describe UserNotifications do
               :chat_mention,
               user: user,
               chat_message: chat_message,
-              notification: notification,
+              notifications: [notification],
             )
           end
 
@@ -406,7 +406,7 @@ describe UserNotifications do
             :chat_mention,
             user: user,
             chat_message: chat_message,
-            notification: notification,
+            notifications: [notification],
           )
         end
 
@@ -513,7 +513,7 @@ describe UserNotifications do
               :chat_mention,
               user: user,
               chat_message: new_message,
-              notification: notification,
+              notifications: [notification],
             )
 
             email = described_class.chat_summary(user, {})
@@ -642,7 +642,12 @@ describe UserNotifications do
               2.times do
                 msg = Fabricate(:chat_message, user: sender, chat_channel: channel)
                 notification = Fabricate(:notification)
-                Fabricate(:chat_mention, user: user, chat_message: msg, notification: notification)
+                Fabricate(
+                  :chat_mention,
+                  user: user,
+                  chat_message: msg,
+                  notifications: [notification],
+                )
               end
 
               email = described_class.chat_summary(user, {})
@@ -668,7 +673,7 @@ describe UserNotifications do
                     :chat_mention,
                     user: user,
                     chat_message: msg,
-                    notification: notification,
+                    notifications: [notification],
                   )
                 end
 
@@ -695,7 +700,7 @@ describe UserNotifications do
               :chat_mention,
               user: user,
               chat_message: new_message,
-              notification: notification,
+              notifications: [notification],
             )
 
             email = described_class.chat_summary(user, {})
diff --git a/plugins/chat/spec/models/chat/message_spec.rb b/plugins/chat/spec/models/chat/message_spec.rb
index 1b88d55a9e2..1601529ec8b 100644
--- a/plugins/chat/spec/models/chat/message_spec.rb
+++ b/plugins/chat/spec/models/chat/message_spec.rb
@@ -449,8 +449,8 @@ describe Chat::Message do
 
     it "destroys chat_mention" do
       message_1 = Fabricate(:chat_message)
-      notification = Fabricate(:notification)
-      mention_1 = Fabricate(:chat_mention, chat_message: message_1, notification: notification)
+      notification = Fabricate(:notification, notification_type: Notification.types[:chat_mention])
+      mention_1 = Fabricate(:chat_mention, chat_message: message_1, notifications: [notification])
 
       message_1.reload.destroy!
 
diff --git a/plugins/chat/spec/queries/chat/channel_unreads_query_spec.rb b/plugins/chat/spec/queries/chat/channel_unreads_query_spec.rb
index 112b255c3b7..be57404be42 100644
--- a/plugins/chat/spec/queries/chat/channel_unreads_query_spec.rb
+++ b/plugins/chat/spec/queries/chat/channel_unreads_query_spec.rb
@@ -128,7 +128,11 @@ describe Chat::ChannelUnreadsQuery do
           user_id: current_user.id,
           data: { chat_message_id: message.id, chat_channel_id: channel.id }.to_json,
         )
-      Chat::Mention.create!(notification: notification, user: current_user, chat_message: message)
+      Chat::Mention.create!(
+        notifications: [notification],
+        user: current_user,
+        chat_message: message,
+      )
     end
 
     it "returns a correct unread mention" do
diff --git a/plugins/chat/spec/requests/chat/api/reads_controller_spec.rb b/plugins/chat/spec/requests/chat/api/reads_controller_spec.rb
index 84190706430..67b3b099b8b 100644
--- a/plugins/chat/spec/requests/chat/api/reads_controller_spec.rb
+++ b/plugins/chat/spec/requests/chat/api/reads_controller_spec.rb
@@ -199,7 +199,7 @@ RSpec.describe Chat::Api::ReadsController do
         }.to_json,
       )
       .tap do |notification|
-        Chat::Mention.create!(user: user, chat_message: msg, notification: notification)
+        Chat::Mention.create!(user: user, chat_message: msg, notifications: [notification])
       end
   end
 end
diff --git a/plugins/chat/spec/requests/chat/api/thread_reads_controller_spec.rb b/plugins/chat/spec/requests/chat/api/thread_reads_controller_spec.rb
index 4f1c0808c33..fe4bc4a7257 100644
--- a/plugins/chat/spec/requests/chat/api/thread_reads_controller_spec.rb
+++ b/plugins/chat/spec/requests/chat/api/thread_reads_controller_spec.rb
@@ -66,7 +66,7 @@ RSpec.describe Chat::Api::ThreadReadsController do
         }.to_json,
       )
       .tap do |notification|
-        Chat::Mention.create!(user: user, chat_message: msg, notification: notification)
+        Chat::Mention.create!(user: user, chat_message: msg, notifications: [notification])
       end
   end
 end
diff --git a/plugins/chat/spec/services/chat/mark_all_user_channels_read_spec.rb b/plugins/chat/spec/services/chat/mark_all_user_channels_read_spec.rb
index 0ba3fb698bd..549e489c177 100644
--- a/plugins/chat/spec/services/chat/mark_all_user_channels_read_spec.rb
+++ b/plugins/chat/spec/services/chat/mark_all_user_channels_read_spec.rb
@@ -85,12 +85,12 @@ RSpec.describe Chat::MarkAllUserChannelsRead do
 
       before do
         Chat::Mention.create!(
-          notification: notification_1,
+          notifications: [notification_1],
           user: current_user,
           chat_message: message_1,
         )
         Chat::Mention.create!(
-          notification: notification_2,
+          notifications: [notification_2],
           user: current_user,
           chat_message: message_3,
         )
diff --git a/plugins/chat/spec/services/chat/trash_message_spec.rb b/plugins/chat/spec/services/chat/trash_message_spec.rb
index 821662433ca..cb03dea8783 100644
--- a/plugins/chat/spec/services/chat/trash_message_spec.rb
+++ b/plugins/chat/spec/services/chat/trash_message_spec.rb
@@ -49,13 +49,13 @@ RSpec.describe Chat::TrashMessage do
 
         it "destroys notifications for mentions" do
           notification = Fabricate(:notification)
-          mention = Fabricate(:chat_mention, chat_message: message, notification: notification)
+          mention = Fabricate(:chat_mention, chat_message: message, notifications: [notification])
 
           result
 
           mention = Chat::Mention.find_by(id: mention.id)
           expect(mention).to be_present
-          expect(mention.notification_id).to be_nil
+          expect(mention.notifications).to be_empty
         end
 
         it "publishes associated Discourse and MessageBus events" do
diff --git a/plugins/chat/spec/services/chat/update_message_spec.rb b/plugins/chat/spec/services/chat/update_message_spec.rb
index 69979936b9a..347675c8fd1 100644
--- a/plugins/chat/spec/services/chat/update_message_spec.rb
+++ b/plugins/chat/spec/services/chat/update_message_spec.rb
@@ -189,7 +189,7 @@ RSpec.describe Chat::UpdateMessage do
         )
 
         mention = user3.chat_mentions.where(chat_message: message.id).first
-        expect(mention.notification).to be_present
+        expect(mention.notifications.length).to be(1)
       end
 
       it "doesn't create mentions for already mentioned users" do
@@ -215,7 +215,7 @@ RSpec.describe Chat::UpdateMessage do
         )
 
         mention = user_without_memberships.chat_mentions.where(chat_message: chat_message).first
-        expect(mention.notification).to be_nil
+        expect(mention.notifications).to be_empty
       end
 
       it "destroys mentions that should be removed" do
@@ -271,7 +271,7 @@ RSpec.describe Chat::UpdateMessage do
         )
 
         mention = admin1.chat_mentions.where(chat_message_id: message.id).first
-        expect(mention.notification).to be_nil
+        expect(mention.notifications).to be_empty
       end
 
       it "creates a chat_mention record without notification when self mentioning" do
@@ -282,7 +282,7 @@ RSpec.describe Chat::UpdateMessage do
 
         mention = user1.chat_mentions.where(chat_message: chat_message).first
         expect(mention).to be_present
-        expect(mention.notification).to be_nil
+        expect(mention.notifications).to be_empty
       end
 
       it "adds mentioned user and their status to the message bus message" do
diff --git a/plugins/chat/spec/services/chat/update_user_last_read_spec.rb b/plugins/chat/spec/services/chat/update_user_last_read_spec.rb
index 9db2ee92fff..bf3195b40bb 100644
--- a/plugins/chat/spec/services/chat/update_user_last_read_spec.rb
+++ b/plugins/chat/spec/services/chat/update_user_last_read_spec.rb
@@ -85,7 +85,7 @@ RSpec.describe Chat::UpdateUserLastRead do
         before do
           Jobs.run_immediately!
           Chat::Mention.create!(
-            notification: notification,
+            notifications: [notification],
             user: current_user,
             chat_message: message_1,
           )
diff --git a/plugins/chat/spec/services/chat/update_user_thread_last_read_spec.rb b/plugins/chat/spec/services/chat/update_user_thread_last_read_spec.rb
index c1bd66fcb03..c2bc3bf6a1f 100644
--- a/plugins/chat/spec/services/chat/update_user_thread_last_read_spec.rb
+++ b/plugins/chat/spec/services/chat/update_user_thread_last_read_spec.rb
@@ -62,12 +62,12 @@ RSpec.describe Chat::UpdateUserThreadLastRead do
         before do
           Jobs.run_immediately!
           Chat::Mention.create!(
-            notification: notification_1,
+            notifications: [notification_1],
             user: current_user,
             chat_message: Fabricate(:chat_message, chat_channel: channel, thread: thread),
           )
           Chat::Mention.create!(
-            notification: notification_2,
+            notifications: [notification_2],
             user: current_user,
             chat_message: Fabricate(:chat_message, chat_channel: channel, thread: thread),
           )