26 refactor health record schema to support unified structure with parent child relationship

[sttadic]

Summary

• Schema Unification: Merged health record and update schemas into a single unified schema
• Hierarchical Structure: Introduced optional rootId field (null for top-level records) and updates array to track child records
• Data Integrity: Implemented validation and pre-save hooks to prevent child records from having their own updates array
• New PATCH Route: Added /updates/:healthRecordId for true partial updates (form edits and conversational corrections)
• Route Restructuring: Converted update route from PUT to POST (/updates/:parentId) for creating chronological health record snapshots
• Enhanced Validation: Created Z_HealthRecordPatch schema and extracted date pre-processing logic into reusable preprocessDates() helper
• Code Quality: Refactored custom validators and route handlers for better consistency and maintainability

Checklist

• My code is up-to-date with the main branch.
• My code has no merge conflicts.
• I have performed a self-review of my code.

[AladinJmila]

Nice progress, we're moving in the right direction 👌

[AladinJmila]

could we rename this to parentRecordId? rootId could mean anything and can be ambiguous to people that are not familiar with the code or the consumers of our API.

[AladinJmila]

I don’t think we need this hook, since our logic should already prevent children from having an updates array. The schema validator is already safeguarding against this, and we should also have additional checks in our endpoints.

In my opinion, the hook is not a good solution for two reasons:

1. If, for whatever reason, data does end up in the updates array, it will be silently cleared and lost without us noticing.
2. This silent data removal could hide a bug in our code that we actually need to fix. The validator is better because it throws an error and makes the issue visible.

[AladinJmila]

There is a built-in validator for object ids in mongoose since this is a common check. This can look like this:

updates: z.array(Z_ObjectId).optional(),

Where Z_ObjectId is:

const Z_ObjectId = z.string().refine((val) => Types.ObjectId.isValid(val), {
  message: "Invalid ObjectId format",
});

You then reuse to validate the parentRecordId as well

parentRecordId: Z_ObjectId.optional().nullable(),

[AladinJmila]

This seemed to be off to me. According to AI, this should be the right implementation, unless you had other reasons for it:

// For HTTP PATCH: Any field can be updated, all are optional, but when provided must be valid
export const Z_HealthRecordPatch = Z_HealthRecord.omit({
  rootId: true,    // Immutable
  updates: true,   // System-managed
}).partial();

[AladinJmila]

Not sure why we need this any longer. Can't we just use the new Z_HealthRecordPatch instead for all our update operations?

[AladinJmila]

This should be, the below, since we need to remove the old entries and replace them with the new ones:

export type HealthRecordType = Omit<z.infer<typeof Z_HealthRecord>, 'parentRecordId' | 'updates'> & {
  parentRecordId?: Types.ObjectId | null; 
  updates?: Types.ObjectId[];         
};

[AladinJmila]

Why did you add system here as well? I was focusing only user input because they are more concise and should have the raw data which is captured by the AI. system prompts are lengthy and would cost us a lot of tokens, we also should not care about old system prompts, we only need to worry about the current one.