[BE-21] Implement AssetNote, Maintenance, and AssetDocument entities

[yusuftomilola]

Overview

Create the AssetNote, Maintenance, and AssetDocument supporting entities inside backend/contrib/.

Location

All work must be inside backend/contrib/src/assets/.

Acceptance Criteria

• AssetNote entity: id, assetId, content, createdBy (ManyToOne eager), createdAt, updatedAt
• Maintenance entity: id, assetId, type (enum), description, scheduledDate, completedDate, cost (decimal), performedBy, notes, status (enum), createdAt
• AssetDocument entity: id, assetId, name, url, type (MIME), size (bytes), uploadedBy (ManyToOne eager), createdAt
• MaintenanceType enum: PREVENTIVE, CORRECTIVE, SCHEDULED
• MaintenanceStatus enum: SCHEDULED, IN_PROGRESS, COMPLETED, CANCELLED
• All entities registered in AssetsModule

[Daveside9]

@Daveside9 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

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[ayshadogo]

@ayshadogo has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hello,
I am aysha, a backend developer with experience in NestJS, ExpressJS, and Node.js.
I would like to contribute to this issue and resolve it.
Thank you.

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[drips-wave]

Congratulations, @ayshadogo! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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[drips-wave]

This issue has been completed by @ayshadogo as part of the Stellar Wave Program's 4th Wave 🥳

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