core: add indexes to improve slow queries performance (#2931)

* core: add indexes to improve slow queries performance

* idx_chat_items_group_id

* update simplexmq, schema

* update simplexmq

* remove index

* update simplexmq

---------

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

src/Simplex/Chat/Migrations/M20230814_indexes.hs

@@ -0,0 +1,18 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Chat.Migrations.M20230814_indexes where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20230814_indexes :: Query
+m20230814_indexes =
+  [sql|
+CREATE INDEX idx_chat_items_user_id_item_status ON chat_items(user_id, item_status);
+|]
+
+down_m20230814_indexes :: Query
+down_m20230814_indexes =
+  [sql|
+DROP INDEX idx_chat_items_user_id_item_status;
+|]

src/Simplex/Chat/Migrations/chat_schema.sql

@@ -701,3 +701,7 @@ CREATE INDEX idx_group_snd_item_statuses_chat_item_id ON group_snd_item_statuses
 CREATE INDEX idx_group_snd_item_statuses_group_member_id ON group_snd_item_statuses(
   group_member_id
 );
+CREATE INDEX idx_chat_items_user_id_item_status ON chat_items(
+  user_id,
+  item_status
+);