LearnSpace: full-stack educational whiteboard platform

Node.js/Express backend + vanilla JS frontend.
Features: real-time collaborative whiteboard (SSE), multi-page support,
LaTeX formulas, shapes/connectors, coordinate systems, number lines,
compass, zoom/pan, Catmull-Rom pencil smoothing, ruler/protractor with
rotation & resize controls, minimap navigation overlay, auto-measurements,
multi-page thumbnails sidebar, PNG export, page templates.
Student/teacher workflows: classes, assignments, library, dashboard.
Mobile responsive. SQLite (better-sqlite3).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/utils/notifications.js

@@ -0,0 +1,26 @@
+const db  = require('../db/db');
+const sse = require('../sse');
+
+function pushNotif(user_id, type, message, link) {
+  try {
+    const { lastInsertRowid } = db.prepare(
+      "INSERT INTO notifications (user_id, type, message, link) VALUES (?, ?, ?, ?)"
+    ).run(user_id, type, message, link || null);
+    sse.emit(user_id, { id: lastInsertRowid, type, message, link: link || null });
+  } catch (e) { console.error('[pushNotif]', e.message); }
+}
+
+/* ── Notify all active parent links for a student ────────────────────── */
+function pushParentNotif(studentId, type, message) {
+  try {
+    const links = db.prepare(
+      'SELECT id FROM parent_links WHERE student_id = ? AND is_active = 1'
+    ).all(studentId);
+    const ins = db.prepare(
+      'INSERT INTO parent_notifications (parent_link_id, type, message) VALUES (?, ?, ?)'
+    );
+    for (const link of links) ins.run(link.id, type, message);
+  } catch (e) { console.error('[pushParentNotif]', e.message); }
+}
+
+module.exports = { pushNotif, pushParentNotif };