ChatMessageReferences: Change seen -> unread

priv/repo/migrations/20200604150318_migrate_seen_to_unread_in_chat_message_references.exs

@@ -0,0 +1,30 @@
+defmodule Pleroma.Repo.Migrations.MigrateSeenToUnreadInChatMessageReferences do
+  use Ecto.Migration
+
+  def change do
+    drop(
+      index(:chat_message_references, [:chat_id],
+        where: "seen = false",
+        name: "unseen_messages_count_index"
+      )
+    )
+
+    alter table(:chat_message_references) do
+      add(:unread, :boolean, default: true)
+    end
+
+    execute("update chat_message_references set unread = not seen")
+
+    alter table(:chat_message_references) do
+      modify(:unread, :boolean, default: true, null: false)
+      remove(:seen, :boolean, default: false, null: false)
+    end
+
+    create(
+      index(:chat_message_references, [:chat_id],
+        where: "unread = true",
+        name: "unread_messages_count_index"
+      )
+    )
+  end
+end