diff --git a/app/config/collections/platform.php b/app/config/collections/platform.php
index b23d170a58..eed45322a4 100644
--- a/app/config/collections/platform.php
+++ b/app/config/collections/platform.php
@@ -1104,28 +1104,46 @@ $platformCollections = [
                 'array' => false,
                 'filters' => [],
             ],
+            [
+                '$id' => ID::custom('read'),
+                'type' => Database::VAR_BOOLEAN,
+                'format' => '',
+                'size' => 0,
+                'signed' => true,
+                'required' => false,
+                'default' => false,
+                'array' => false,
+                'filters' => [],
+            ],
         ],
         'indexes' => [
             [
                 '$id' => ID::custom('_key_messageId'),
-                'type' => Database::INDEX_UNIQUE,
+                'type' => Database::INDEX_KEY,
                 'attributes' => ['messageId'],
                 'lengths' => [Database::LENGTH_KEY],
                 'orders' => [Database::ORDER_ASC],
             ],
             [
-                '$id' => ID::custom('_key_userId'),
-                'type' => Database::INDEX_KEY,
-                'attributes' => ['userId'],
-                'lengths' => [Database::LENGTH_KEY],
-                'orders' => [Database::ORDER_ASC],
+                '$id' => ID::custom('_key_recipient'),
+                'type' => Database::INDEX_UNIQUE,
+                'attributes' => ['messageId', 'channel', 'userId', 'teamId'],
+                'lengths' => [Database::LENGTH_KEY, 64, Database::LENGTH_KEY, Database::LENGTH_KEY],
+                'orders' => [Database::ORDER_ASC, Database::ORDER_ASC, Database::ORDER_ASC, Database::ORDER_ASC],
             ],
             [
-                '$id' => ID::custom('_key_teamId'),
+                '$id' => ID::custom('_key_userId_read'),
                 'type' => Database::INDEX_KEY,
-                'attributes' => ['teamId'],
-                'lengths' => [Database::LENGTH_KEY],
-                'orders' => [Database::ORDER_ASC],
+                'attributes' => ['userId', 'read'],
+                'lengths' => [Database::LENGTH_KEY, 0],
+                'orders' => [Database::ORDER_ASC, Database::ORDER_ASC],
+            ],
+            [
+                '$id' => ID::custom('_key_teamId_read'),
+                'type' => Database::INDEX_KEY,
+                'attributes' => ['teamId', 'read'],
+                'lengths' => [Database::LENGTH_KEY, 0],
+                'orders' => [Database::ORDER_ASC, Database::ORDER_ASC],
             ],
             [
                 '$id' => ID::custom('_key_projectId'),