diff --git a/app/models/chat_conversation_account.rb b/app/models/chat_conversation_account.rb
index dad54cac..b2ac7bda 100644
--- a/app/models/chat_conversation_account.rb
+++ b/app/models/chat_conversation_account.rb
@@ -12,7 +12,7 @@
 #  is_approved                    :boolean          default(FALSE), not null
 #  created_at                     :datetime         not null
 #  updated_at                     :datetime         not null
-#  unread_count                   :bigint(8)        default(0), not null
+#  unread_count                   :bigint(8)        default(0)
 #  chat_message_expiration_policy :string
 #  is_muted                       :boolean          default(FALSE), not null
 #
diff --git a/db/migrate/20210102225500_add_index_on_status_revisions.rb b/db/migrate/20210102225500_add_index_on_status_revisions.rb
new file mode 100644
index 00000000..43479b66
--- /dev/null
+++ b/db/migrate/20210102225500_add_index_on_status_revisions.rb
@@ -0,0 +1,7 @@
+class AddIndexOnStatusRevisions < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def change
+    add_index :status_revisions, :status_id, algorithm: :concurrently
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 0b23d182..93225d24 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_12_22_040559) do
+ActiveRecord::Schema.define(version: 2021_01_02_225500) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_stat_statements"
@@ -221,7 +221,7 @@ ActiveRecord::Schema.define(version: 2020_12_22_040559) do
     t.boolean "is_approved", default: false, null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.bigint "unread_count", default: 0, null: false
+    t.bigint "unread_count", default: 0
     t.string "chat_message_expiration_policy"
     t.boolean "is_muted", default: false, null: false
     t.index ["account_id"], name: "index_chat_conversation_accounts_on_account_id"
@@ -720,6 +720,7 @@ ActiveRecord::Schema.define(version: 2020_12_22_040559) do
     t.string "text"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.index ["status_id"], name: "index_status_revisions_on_status_id"
   end
 
   create_table "status_stats", force: :cascade do |t|