fix: 订阅任务执行失败时前端状态展示异常

[Micro66]

Summary by CodeRabbit

Release Notes

• Bug Fixes
  • Improved error handling in subscription task execution. Errors in both streaming and callback-based execution flows are now properly detected, logged, and included in task completion events with accurate status indicators and error details for better visibility.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3e819bbb-69cf-4ff3-a926-fed26773f287

📥 Commits

Reviewing files that changed from the base of the PR and between 6d05ad3 and 6ddd4f7.

📒 Files selected for processing (1)

• backend/app/services/subscription/unified_executor.py

📝 Walkthrough

Walkthrough

This change adds error detection and handling to the subscription executor's event processing flows. When final events indicate errors, the system now captures error details, logs warnings, sets appropriate completion statuses, and publishes TaskCompletedEvent with error information across both SSE and HTTP+Callback execution paths.

Changes

Cohort / File(s)	Summary
Error Handling in Subscription Executor backend/app/services/subscription/unified_executor.py	Added error detection in SSE and HTTP+Callback execution modes. Detects ERROR event types, captures error messages, logs warnings, sets dynamic completion status (COMPLETED or FAILED), and publishes TaskCompletedEvent with error details. Includes import for EventType from shared.models.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A hop through the error paths we go,

Detecting failures high and low,

Events complete with grace and care,

Status and message, now they're there! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title in Chinese describes fixing frontend status display anomalies when subscription task execution fails, which directly aligns with the code changes that add error handling and TaskCompletedEvent publishing for failed executions.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch human/llama-20260303-033316

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