Added notes for crud commit

notes/work-report-2026-04-21-to-22.md

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+## #Overview
+Today I implemented a full **CRUD system** for the three core entities in the application:
+- **Subjects**
+- **Assignments**
+- **Tasks**
+
+This includes creating, editing, viewing details, and deleting records, as well as connecting all screens using Expo Router.
+
+---
+
+## #ImplementedFeatures
+
+### #Subjects
+Created full CRUD flow:
+- `createSubject.tsx`
+- `editSubject.tsx`
+- `viewDetailsSubject.tsx`
+
+**Functionality:**
+- Create new subjects
+- Edit existing subjects
+- View subject details
+- Delete subjects
+
+**Relationships:**
+- Subjects act as the top-level entity
+- Assignments can optionally be linked to a subject via `sId`
+- Subjects are displayed:
+  - globally (`subjects.tsx`)
+  - or standalone (`viewDetailsSubjects.tsx`)
+
+---
+
+### #Assignments
+Created full CRUD flow:
+- `createAssignment.tsx`
+- `editAssignment.tsx`
+- `viewDetailsAssignment.tsx`
+
+**Functionality:**
+- Create assignments (with optional `sId`)
+- Edit assignments
+- View assignment details
+- Delete assignments
+
+**Relationships:**
+- Assignments can exist:
+  - linked to a subject (`sId`)
+  - or standalone (`sId = null`)
+- Assignments are displayed:
+  - globally (`assignments.tsx`)
+  - or within a subject (`viewDetailsSubject.tsx`)
+  - or standalone (`viewDetailsAssignment.tsx`)
+
+---
+
+### #Tasks
+Created full CRUD flow:
+- `createTask.tsx`
+- `editTask.tsx`
+- `viewDetailsTask.tsx`
+
+**Functionality:**
+- Create tasks
+- Edit tasks
+- View task details
+- Delete tasks
+
+**Relationships:**
+- Tasks are linked to assignments via `aId`
+- Tasks are accessed through assignment detail pages
+- Assignments are displayed:
+  - globally (`tasks.tsx`)
+  - or within an assignment (`viewDetailsAssignment.tsx`)
+  - or standalone (`viewDetailsTask.tsx`)
+
+---
+
+## #RoutingStructure
+
+### #TopLevelScreens
+- `subjects.tsx` → list of all subjects
+- `assignments.tsx` → list of all assignments
+- `tasks.tsx` → list of all tasks
+- `index.tsx` → pre-existing home screen
+
+---
+
+## #DataModel
+
+### #Subject
+- `sId`
+- `title`
+- `description`
+- `isActive`
+- `lastChanged`
+- `uId`
+
+### #Assignment
+- `aId`
+- `title`
+- `description`
+- `deadline`
+- `isCompleted`
+- `lastChanged`
+- `uId`
+- `sId`
+
+### #Task
+- `tId`
+- `title`
+- `description`
+- `isCompleted`
+- `lastChanged`
+- `uId`
+- `aId`