task(users): create User entity and initial migration

[a-malik-gh]

Module

users

Background & context

The User entity represents individuals interacting with OpenCred.

Users may act as:

• credential holders
• issuers
• administrators

This entity will later connect to credentials, wallet authentication, and verification systems.

The initial entity should prioritize clean schema design and future extensibility.

Acceptance criteria

• A User entity is created using TypeORM
• The entity includes wallet address support
• Timestamps are included (createdAt, updatedAt)
• A migration file is generated
• Wallet address uniqueness is enforced
• Entity naming conventions follow project standards
• Unit tests validate entity constraints where applicable

Files to edit

• A User entity is created using TypeORM
• The entity includes wallet address support
• Timestamps are included (createdAt, updatedAt)
• A migration file is generated
• Wallet address uniqueness is enforced
• Entity naming conventions follow project standards
• Unit tests validate entity constraints where applicable

Helpful resources

• TypeORM Entities:
  https://typeorm.io/entities

• NestJS TypeORM Integration:
  https://docs.nestjs.com/techniques/database

Estimated difficulty

Medium — some domain knowledge required