_export2 no longer blocks event loop during decryption

Removed sorting in get_all_accounts
Removed decrypt_multiple function because it is no longer used
Now running decrytion of accounts in ProcessPoolExecutor

src/bot/message_handlers.py

@@ -1,5 +1,7 @@
+import asyncio
 import functools
 import gc
+from concurrent.futures import ProcessPoolExecutor
 
 import telebot
 from sqlalchemy.future import Engine
@@ -534,7 +536,16 @@ async def _export2(
         )
 
     accounts = database.get.get_all_accounts(engine, mes.from_user.id)
-    accounts = encryption.other_accounts.decrypt_multiple(accounts, text)
+    with ProcessPoolExecutor() as pool:
+        loop = asyncio.get_running_loop()
+        tasks = []
+        for account in accounts:
+            function = functools.partial(
+                encryption.other_accounts.decrypt, account, text
+            )
+            tasks.append(loop.run_in_executor(pool, function))
+        accounts = await asyncio.gather(*tasks)
+        accounts.sort(key=lambda account: account.name)
     json_io = accounts_to_json(accounts)
     await bot.send_document(
         mes.chat.id,