Fix security and reliability issues identified in code review:
1. Security: Remove non-null assertions in credentials.ts
- Add proper validation before returning credentials
- Throw early with clear error messages showing which vars are missing
- Prevents runtime failures with cryptic undefined errors
2. Reliability: Add pagination safety limits
- Add MAX_PAGES limit (1000) to all pagination loops
- Prevents infinite loops if API returns same cursor repeatedly
- Applies to: cleanupOrphanedWorkflows, cleanupOldExecutions, cleanupExecutionsByWorkflow
Changes ensure safer credential handling and prevent potential infinite loops
in cleanup operations.
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Co-Authored-By: Claude <noreply@anthropic.com>
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