Fix: Copied attachments throw not_scanned error when opened

[akgarg06]

Describe your changes

• Fixed {"error":{"code":"not_scanned",...}} error thrown when opening attachments from copied sourcing events
• Root cause: createDraftEntries inserted records via DraftService.newDraft() which routes through CAP's handler chain — @readonly fields (status, scannedAt) get stripped, causing HANA to apply the column default 'Unscanned'
• Fix: after newDraft(insert), a follow-up persistenceService.run(Update) writes status = 'Clean' and scannedAt = current timestamp directly to the draft table, bypassing @readonly enforcement

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Root Cause Detail

createDraftEntries
  └─ matchingService.newDraft(insert)
       └─ CAP handler chain fires
            └─ @readonly fields (status, scannedAt) stripped from INSERT payload
                 └─ HANA applies DEFAULT: status = 'Unscanned', scannedAt = null

User opens copied attachment
  └─ CAP AttachmentStatusValidator checks status != "Clean"
       └─ throws not_scanned error

New uploads are unaffected because addAttachmentToDraft uses persistenceService.run() directly (bypasses CAP handler chain).

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Files Changed

File	Change
sdm/src/main/java/.../service/handler/SDMCustomServiceHandler.java	Add post-UPDATE via persistenceService after newDraft to write status='Clean' and scannedAt=now() directly to the draft table

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist before requesting a review

• I follow Java Development Guidelines for SAP
• I have tested the functionality on my cloud environment.
• I have provided sufficient automated/ unit tests for the code.
• I have increased or maintained the test coverage.
• I have ran integration tests on my cloud environment.
• I have validated blackduck portal for any vulnerability after my commit.

Upload Screenshots/lists of the scenarios tested

• I have Uploaded Screenshots or added lists of the scenarios tested in description

Single Tenant test cases : https://github.com/cap-java/sdm/actions/runs/36109446454
Multi Tenant test cases: https://github.com/cap-java/sdm/actions/runs/36139011245