Implement Asset Transfer and Assignment Workflow Engine

[yusuftomilola]

Description

Build a robust workflow engine for handling asset transfers between users, departments, and locations with approval chains, notifications, and complete audit trails.

Requirements

Transfer Entity:

Transfer {
  id: UUID (primary key)
  transferType: enum (USER, DEPARTMENT, LOCATION, COMPLETE)
  assets: ManyToMany -> Asset
  fromUser: ManyToOne -> User (nullable)
  toUser: ManyToOne -> User (nullable)
  fromDepartment: ManyToOne -> Department (nullable)
  toDepartment: ManyToOne -> Department (nullable)
  fromLocation: ManyToOne -> Location (nullable)
  toLocation: ManyToOne -> Location (nullable)
  status: enum (PENDING, APPROVED, REJECTED, COMPLETED, CANCELLED)
  requestedBy: ManyToOne -> User
  approvedBy: ManyToOne -> User (nullable)
  rejectedBy: ManyToOne -> User (nullable)
  reason: text (required)
  notes: text (optional)
  approvalRequired: boolean (default: false)
  rejectionReason: text (nullable)
  scheduledDate: timestamp (nullable)
  completedAt: timestamp (nullable)
  createdAt: timestamp
  updatedAt: timestamp
}

TransferApprovalRule Entity:

TransferApprovalRule {
  id: UUID (primary key)
  name: string (required)
  description: text (optional)
  conditions: jsonb (e.g., { minValue: 1000, categories: [...] })
  approverRole: ManyToOne -> Role
  approverUser: ManyToOne -> User (nullable)
  isActive: boolean (default: true)
  priority: integer (for multiple rules)
  createdAt: timestamp
  updatedAt: timestamp
}

API Endpoints:

• POST /api/v1/transfers - Create transfer request
• GET /api/v1/transfers - List transfers (with filters)
• GET /api/v1/transfers/:id - Get transfer details
• PUT /api/v1/transfers/:id/approve - Approve transfer
• PUT /api/v1/transfers/:id/reject - Reject transfer
• DELETE /api/v1/transfers/:id - Cancel pending transfer
• POST /api/v1/transfers/:id/execute - Manually execute approved transfer
• POST /api/v1/transfers/:id/undo - Undo completed transfer (within time limit)
• GET /api/v1/transfers/pending-approval - Get transfers pending my approval
• POST /api/v1/transfers/approval-rules - Create approval rule
• GET /api/v1/transfers/approval-rules - List approval rules
• PUT /api/v1/transfers/approval-rules/:id - Update approval rule
• DELETE /api/v1/transfers/approval-rules/:id - Delete approval rule

Business Logic:

• Evaluate approval rules when transfer is created
• Auto-approve transfers that don't meet approval criteria
• Send notifications to approvers when approval required
• Prevent transfer of RETIRED assets
• Validate that assets are available for transfer (not in another pending transfer)
• Execute scheduled transfers at specified date/time (cron job)
• Create asset history entries for all transfers
• Update asset assignments atomically (transaction)
• Allow undo within configurable time window (default: 24 hours)
• Lock assets during transfer to prevent concurrent modifications

Approval Rule Matching:

// Example conditions
{
  minValue: 5000,           // Requires approval if total asset value > 5000
  maxValue: null,
  categories: ['Computer', 'Vehicle'],  // Requires approval for these categories
  departments: ['IT', 'Finance'],       // Requires approval for these departments
  requiresAllConditions: false          // OR logic vs AND logic
}

Validation Rules:

• At least one asset must be selected
• Transfer reason: 10-500 characters
• Cannot transfer to same user/department/location
• Assets must exist and not be deleted
• Destination user/department/location must exist
• Scheduled date must be in future
• Cannot approve/reject your own transfer request

Technical Specifications

• Use database transactions for atomic transfers
• Implement pessimistic locking to prevent race conditions
• Create background job queue for scheduled transfers (Bull/BullMQ)
• Implement event emitters for notifications
• Use Redis for transfer locks and rate limiting
• Create indexes on status, requestedBy, scheduledDate
• Implement idempotent transfer execution
• Add retry mechanism for failed transfers

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[portableDD]

@portableDD has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

Hi Maintainer

I will implement a transaction-safe asset transfer workflow with approval rule evaluation, event-driven notifications, scheduled execution via a job queue, pessimistic locking for concurrency control, and full audit trails including reversible undo within a time window.

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Congratulations, @portableDD! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on January 31, 2026.

🧑‍💻 @portableDD: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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