Create initial type orm database migration

[Habibah371]

[BE-33] Create Initial TypeORM Database Migration Infrastructure for OpsCE

Summary

This PR introduces the initial TypeORM migration setup for the OpsCE module and replaces automatic schema synchronization with a migration-driven workflow. The change establishes a safer and more maintainable database management process suitable for staging and production environments.

Problem

The application currently relies on synchronize: true within the TypeORM configuration. While convenient during development, automatic schema synchronization can introduce unintended database changes and data integrity risks in non-local environments.

Additionally, the project lacks migration files, making schema changes difficult to track, review, version, and roll back.

Changes Implemented

Database Configuration

• Added backend/src/opsce/database/dataSource.ts for TypeORM CLI operations.
• Updated TypeORM configuration to use synchronize: false.

Migration Tooling

• Added migration management scripts to backend/package.json:

  • migration:generate
  • migration:run
  • migration:revert

Initial Schema Migration

• Generated and committed the initial migration based on all OpsCE entities created in BE-01 through BE-06.
• Ensured the migration accurately reflects the current database schema.

Testing & Verification

• Verified that npm run migration:run successfully creates the complete database schema.
• Verified that npm run migration:revert successfully rolls back the latest migration.
• Confirmed application startup works correctly with migrations applied and without schema synchronization enabled.

Benefits

• Prevents uncontrolled schema modifications during application startup.
• Enables version-controlled database evolution.
• Improves deployment reliability across environments.
• Provides a clear rollback path for schema changes.
• Aligns the project with TypeORM best practices for production systems.

Acceptance Criteria

• backend/src/opsce/database/dataSource.ts created for TypeORM CLI usage
• synchronize: false configured in AppModule
• Migration scripts added to backend/package.json
• Initial migration generated and committed covering all OpsCE entities
• npm run migration:run applies the schema successfully
• npm run migration:revert rolls back the latest migration successfully
  Closes [BE-33] Create initial TypeORM database migration files in opsce module #758

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