feat: Implement student notes functionality for lessons, including API endpoints, database schema, and frontend UI.

services/lms-service/migrations/20260216000001_student_notes.sql

@@ -0,0 +1,17 @@
+-- Migration: Create Student Notes Table
+-- Description: Allows students to save personal notes for each lesson.
+
+CREATE TABLE IF NOT EXISTS student_notes (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    lesson_id UUID NOT NULL REFERENCES lessons(id) ON DELETE CASCADE,
+    content TEXT NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE(user_id, lesson_id)
+);
+
+-- Index for faster retrieval by user
+CREATE INDEX IF NOT EXISTS idx_student_notes_user_id ON student_notes(user_id);
+-- Index for faster retrieval by lesson (useful if we ever want to see all notes for a lesson as an instructor, though not requested yet)
+CREATE INDEX IF NOT EXISTS idx_student_notes_lesson_id ON student_notes(lesson_id);

services/lms-service/src/handlers_notes.rs

@@ -0,0 +1,53 @@
+use axum::{
+    Json,
+    extract::{Path, State},
+    http::StatusCode,
+};
+use common::auth::Claims;
+use common::models::{SaveNotePayload, StudentNote};
+use sqlx::PgPool;
+use uuid::Uuid;
+
+pub async fn get_note(
+    claims: Claims,
+    Path(lesson_id): Path<Uuid>,
+    State(pool): State<PgPool>,
+) -> Result<Json<Option<StudentNote>>, (StatusCode, String)> {
+    let note = sqlx::query_as::<_, StudentNote>(
+        "SELECT * FROM student_notes WHERE user_id = $1 AND lesson_id = $2",
+    )
+    .bind(claims.sub)
+    .bind(lesson_id)
+    .fetch_optional(&pool)
+    .await
+    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;
+
+    Ok(Json(note))
+}
+
+pub async fn save_note(
+    claims: Claims,
+    Path(lesson_id): Path<Uuid>,
+    State(pool): State<PgPool>,
+    Json(payload): Json<SaveNotePayload>,
+) -> Result<Json<StudentNote>, (StatusCode, String)> {
+    let note = sqlx::query_as::<_, StudentNote>(
+        r#"
+        INSERT INTO student_notes (user_id, lesson_id, content)
+        VALUES ($1, $2, $3)
+        ON CONFLICT (user_id, lesson_id) 
+        DO UPDATE SET 
+            content = EXCLUDED.content,
+            updated_at = NOW()
+        RETURNING *
+        "#,
+    )
+    .bind(claims.sub)
+    .bind(lesson_id)
+    .bind(payload.content)
+    .fetch_one(&pool)
+    .await
+    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;
+
+    Ok(Json(note))
+}

services/lms-service/src/main.rs

@@ -2,6 +2,7 @@ mod db_util;
 mod handlers;
 mod handlers_announcements;
 mod handlers_discussions;
+mod handlers_notes;
 mod handlers_payments;
 
 use axum::{
@@ -147,6 +148,8 @@ async fn main() {
             "/announcements/{id}",
             delete(handlers_announcements::delete_announcement),
         )
+        .route("/lessons/{id}/notes", get(handlers_notes::get_note))
+        .route("/lessons/{id}/notes", put(handlers_notes::save_note))
         .route_layer(middleware::from_fn(
             common::middleware::org_extractor_middleware,
         ));