fix: handle Decimal serialization in attached_clients response

[layertwo]

Summary

• DynamoDB returns numeric fields (createdAt, lastAccessTime) as Decimal objects, causing TypeError: Object of type Decimal is not JSON serializable in device-related endpoints
• Replaced json.dumps with the existing json_dumps utility (src/shared/utils.py) which uses DecimalEncoder to convert Decimal → float
• Affected routes:
  • GET /v1/account/attached_clients
  • GET /v1/account/devices
  • POST /v1/account/device

Test plan

• All 1002 existing tests pass with 100% coverage
• Verify the three affected endpoints no longer raise TypeError for users with devices that have numeric timestamp fields

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
lambda/src/routes/auth
account_attached_clients.py
account_device.py
account_devices.py
Project Total

This report was generated by python-coverage-comment-action

[github-actions]

Diff for stage: DefaultStage

Diff for stack: GitHubOidcStack - 0 to add, 1 to update, 0 to destroy 🟡

Details

Resources
[~] Custom::AWSCDKOpenIdConnectProvider GitHubOidcProvider7EBF861F
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 └─ [~] RejectUnauthorized
[~] AWS::Lambda::Function CustomAWSCDKOpenIdConnectProviderCustomResourceProviderHandlerF2C543E0
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Diff for stack: Service-prod - 0 to add, 0 to update, 0 to destroy ✅

Details

Resources
[~] AWS::Lambda::Function AuthApiHandlerED50ACFA
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[~] AWS::Lambda::Function TokenApiHandler2E66DB25
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[~] AWS::Lambda::Function ProfileApiHandler9B65A298
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[~] AWS::Lambda::Function ApiHandler5E7490E8
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 │       ├─ [-] 6e7b68b5b107e56522cc306a58423e59ffdea3918ca8c745c847f831592141b7.zip
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[~] AWS::Lambda::Function ChannelApiHandler02759D57
 ├─ [~] Code
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No Changes for stack: Frontend-prod ✅
No Changes for stack: Monitoring-prod ✅

Generated for commit 557f269 at 2026-03-04T03:07:04.898Z