### What problem does this PR solve?
1. Remove unused columns
2. Check the empty database
3. Switch on the order by expression
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
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Signed-off-by: Jin Hai <haijin.chn@gmail.com>
### What problem does this PR solve?
Handle 404 exception when init memory size from es.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
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Co-authored-by: Liu An <asiro@qq.com>
### What problem does this PR solve?
Fix orde by when pick msg to remove.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
---------
Co-authored-by: Liu An <asiro@qq.com>
### What problem does this PR solve?
Manage message and use in agent.
Issue #4213
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
