Add multi-metric note selection to compliance detail panel

backend/migrations/add_compliance_notes_group_id.js

@@ -0,0 +1,29 @@
+// Migration: Add group_id column to compliance_notes table
+const sqlite3 = require('sqlite3').verbose();
+const path = require('path');
+
+const dbPath = path.join(__dirname, '..', 'cve_database.db');
+const db = new sqlite3.Database(dbPath);
+
+console.log('Starting add_compliance_notes_group_id migration...');
+
+db.serialize(() => {
+    db.run(`ALTER TABLE compliance_notes ADD COLUMN group_id TEXT`, (err) => {
+        if (err) console.error('Error adding group_id column:', err);
+        else console.log('✓ group_id column added to compliance_notes');
+    });
+
+    db.run(`CREATE INDEX IF NOT EXISTS idx_compliance_notes_group ON compliance_notes(group_id)`, (err) => {
+        if (err) console.error('Error creating group_id index:', err);
+        else console.log('✓ idx_compliance_notes_group created');
+    });
+
+    db.run(`UPDATE compliance_notes SET group_id = 'legacy-' || id WHERE group_id IS NULL`, (err) => {
+        if (err) console.error('Error backfilling group_id:', err);
+        else console.log('✓ Existing rows backfilled with legacy group_id');
+    });
+});
+
+db.close(() => {
+    console.log('Migration complete!');
+});