> ## Documentation Index
> Fetch the complete documentation index at: https://committ.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# February 5th, 2026

> Implementation of Self-Perpetuating Verification Chain and Security Hardening

# February 5th, 2026

**Hardening the Core: Verification Chains and Conflict Detection**

Today's focus was on implementing the self-perpetuating verification system that powers the "chain" of accountability in CommitT, alongside critical security hardening and conflict detection mechanisms.

***

## 🏗️ What We Built Today

We delivered a series of critical backend and frontend updates, moving from basic task creation to a robust, conflict-aware, and secure system.

### 1. Self-Perpetuating Verification Chain

**Commit:** `0882ca6` `feat(tasks): schedule verification check at time slot end`

The core engine of CommitT is now live. When a task instance is created, we automatically schedule its verification.

* **Automated Scheduling**: At the end of every time slot, a system job runs to verify the user's proof.
* **The "Chain"**: This verification job not only checks the current instance but is responsible for spawning the *next* instance in the chain.

### 2. Intelligent Conflict Detection

**Commit:** `7d8e0d9` `feat(tasks): add conflict detection and refactor task screens`

We solved the "double-booking" problem by implementing conflict detection at both the database and UI levels.

**Backend (`convex/tasks.ts`):**

* **Conflict Check**: Added logic to scan existing time windows before creating or updating tasks.
* **Graceful Failures**: Instead of throwing raw errors, we now return structured result objects `{ success, error }` to the frontend.
* **Self-Exclusion**: Updates correctly ignore the current task being edited to prevent false positives.

**Frontend (`final.tsx` & `commits.tsx`):**

* **Error Modals**: User-friendly messages when conflicts are detected (e.g., "You already have a commitment on Monday at 9:00 AM").
* **Performance**: Heavy rendering logic in the commits list was memoized.
* **Refactor**: Cleaned up the "Final" screen by extracting constants and types.

### 3. Robust Security & Auth

**Commit:** `cb5a399` `fix(security): implement robust auth, validation & error handling`

We locked down the API to prevent unauthorized access and ensured data integrity.

* **Strict Auth**: `create`, `update`, and `remove` mutations now enforce `ctx.auth` checks.
* **Session-Based Identity**: We stopped trusting client-side `userId` arguments. The backend now derives identity directly from the secure session.
* **Mirror Validation**: Backend validation rules now perfectly mirror frontend rules, preventing API misuse (e.g., bypassing UI checks).
* **Error Handling**: Added robust `try-catch` blocks to handle network or server failures gracefully in the UI.

### 4. Recurrence Schema Migration

**Commit:** `b52228b` `feat(schema): move time_windows to recurrence`

We aligned the database schema with our finalized recurrence model.

* **Schema Update**: Moved `time_windows` out of generic conditions and into the dedicated `recurrence` object.
* **Type Sync**: Updated frontend TypeScript types to match the new Convex schema.

***

## 📂 Key Files Modified

| Component    | File Path                                          | Changes                                                |
| ------------ | -------------------------------------------------- | ------------------------------------------------------ |
| **Backend**  | `packages/backend/convex/tasks.ts`                 | Conflict detection, auth enforcement, scheduling logic |
| **Backend**  | `packages/backend/convex/lib/conflictDetection.ts` | New conflict checking module                           |
| **Frontend** | `apps/native/app/(create-commit)/final.tsx`        | Error handling, conflict modal, type safety            |
| **Frontend** | `apps/native/app/(main)/commits.tsx`               | List optimization, memoization, sorting                |
| **Store**    | `apps/native/stores/useTaskDraftStore.ts`          | Updated mutations to remove insecure `userId` arg      |

***

## 🔒 Security & Validation Details

We implemented a "Trust No One" approach for the API:

1. **Authorization**: Only the task creator (assigner) can modify or delete a task.
2. **Input Validation**:
   * Title must be present
   * Time windows must be valid (start \< end)
   * Recurrence rules must have at least one valid slot
3. **Identity**: `userId` is pulled from the JWT token, not the request body.

***

## ⏭️ Next Steps

With the core verification loop and security layer in place, we are ready to move to:

1. **Proof Collection**: Implementing the actual upload/verification logic for photos and location.
2. **Partner Verification**: Allowing accountability partners to validate proofs.
3. **Notifications**: Alerting users when their verification is due.