[PR] JAMES-2586 Add index for thread table [james-project]

[via GitHub]

vttranlina opened a new pull request, #2528:
URL: https://github.com/apache/james-project/pull/2528

   The performance test reveals that the query on the `thread` table is take 
time:
   ```sql
   select
     thread_id,
     hash_base_subject
   from thread
   where (
     username = $1
     and hash_mime_message_id in (
       $2, $3
     )
   )
   ```
   
   before
   
![image](https://github.com/user-attachments/assets/04a2b8ed-88f6-47ad-865d-4e3ed51583f1)
   
   After
   
![image](https://github.com/user-attachments/assets/3480f711-ab31-4ec3-9cf7-4eb165aed205)
   


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