Revert "完善数据层慢SQL观测与消息查询优化"

This reverts commit b2d900070c.

db/scripts/init.sql

@@ -52,12 +52,6 @@ create or replace index idx_date_timestamp
 create or replace index idx_group_timestamp
     on message_archive.messages (group_id, timestamp);
 
-create or replace index idx_group_sender_timestamp
-    on message_archive.messages (group_id, sender, timestamp);
-
-create or replace index idx_group_type_timestamp
-    on message_archive.messages (group_id, message_type, timestamp);
-
 create or replace index idx_message_sender
     on message_archive.messages (sender);
 
@@ -67,9 +61,6 @@ create or replace index idx_message_type
 create or replace index messages_message_id_index
     on message_archive.messages (message_id);
 
-create or replace index idx_media_pending_lookup
-    on message_archive.messages (message_type, image_path, timestamp, group_id);
-
 create or replace table message_archive.t_emoji_assets
 (
     md5               varchar(64)                          not null comment '表情MD5'