Feat/update unit model

[Duy-Nguyen1104]

Description

This pull request introduces foundational changes to the Unit model to support the upcoming Course Flow feature. It adds credit_points, prerequisites, and corequisites columns to the units table.

The primary motivation is to store and make readily available key unit attributes that will be displayed in an overlay component within the Course Flow UI. By denormalizing this data onto the Unit model, we can provide a faster and more responsive user experience, as it avoids the need for complex real-time queries to gather this information for display purposes.

The UnitsApi has also been updated to accept and persist these new attributes.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Logging the units inside the browser ahs shown that API response has included these attributes to the Unit entity:

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[returnMarcco]

Hi @Duy-Nguyen1104,

This is my first backend review, so I'll do my best to review and test your changes.

Important: After a discussion with @Duy-Nguyen1104, I can confirm that there are ccmmits in this PR that are not relevant to the updating of the Unit model. This means that this review applies to the following commit only:
fe682de

Findings

• I can see that three new fields have been added to the Units table - prerequisite, corequisite, and credit_points.
• I can see that the unit API has been adjusted to accept these new fields.
• The new migrations have been executed successfully with the Units table successfully updated with the new columns.

API Response Testing

• I have made a GET request to the /api/units/ endpoint.
• The response contains the following fields:

• I can clearly see that the new fields have been returned in the response from the endpoint.

Suggestions

• As mentioned, this review and approval applies only to the commit linked above. I suggest ensuring that the other commits contained in this PR are safe to be merged in at the same time.

All in all, well done.

[returnMarcco]

This approval only applies to commit hash fe682de46077e12aa4f7e033c9134aeefa1560ae.
Please ensure the other commits contained in this PR are safe to be merged upstream at the same time.

[giangnht19]

The /api/units endpoint returns the expected response with proper structure and relevant data fields. I verified that:

• Prerequisite, corequisite, and credit_points are already added to Unit model
• The api has also been updated

Good work!

[BrianDangDev]

• Added API and model for managing course/unit requirements.
• Units now support credit points, prerequisites, and corequisites.
• If userId is nil in the course map API, it returns the template course map