#633 Add Repository pattern for Vault entity

[vic-Gray]

architecture · Effort: M\n\nWhat: Extract all direct TypeORM calls from VaultsService into a dedicated VaultRepository.\n\nWhy: Mixing data access with business logic makes testing and maintenance harder.\n\nHints:\n- backend/src/vaults/vaults.service.ts\n- Create `backend/src/vaults/vault.repository.ts

[iGEORGE17]

@iGEORGE17 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Objective: Decouple data access from business logic by extracting all direct TypeORM database interactions out of VaultsService and into a dedicated VaultRepository.

Key Execution Steps:

Create Repository (vault.repository.ts): Design an @Injectable() custom repository class that wraps the native TypeORM Repository and exposes clean data-access methods (e.g., findById, createVault).

Update Module (vaults.module.ts): Register the new VaultRepository as a provider within the module so it can be handled by NestJS's dependency injection container.

Refactor Service (vaults.service.ts): Swap the @InjectRepository(Vault) constructor dependency with the new VaultRepository, updating internal methods to delegate all database operations to it.

Validation: Run local builds (npm run build) to ensure type safety, update service unit tests using the simplified repository interface, and perform smoke tests on core endpoints to verify runtime consistency.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @iGEORGE17 to this issue.

[raphael-01-visual]

@raphael-01-visual has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Can I work on this issue ? ETA - 12hrs

ℹ️ Repo Maintainers: To accept this application, review their application or assign @raphael-01-visual to this issue.

[drips-wave]

Congratulations, @raphael-01-visual! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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