db created, added tests -- tentative

backend/db/seed.js

@@ -0,0 +1,40 @@
+import 'dotenv/config';
+import { readFile } from 'fs/promises';
+import { query, close } from './index.js';
+
+const NOTES_PATH = new URL('../data/notes.json', import.meta.url);
+
+const run = async () => {
+  try {
+    const raw = await readFile(NOTES_PATH, 'utf-8');
+    const notes = JSON.parse(raw);
+
+    const insertQuery = `
+      INSERT INTO notes (id, text, x, y, author, color)
+      VALUES ($1, $2, $3, $4, $5, $6)
+      ON CONFLICT (id) DO NOTHING
+    `;
+
+    let inserted = 0;
+    for (const note of notes) {
+      const result = await query(insertQuery, [
+        note.id,
+        note.text,
+        note.x,
+        note.y,
+        note.author,
+        note.color,
+      ]);
+      inserted += result.rowCount;
+    }
+
+    console.log(`Seed complete — ${inserted} notes inserted (${notes.length - inserted} already existed).`);
+  } catch (err) {
+    console.error('Seed failed:', err.message);
+    process.exit(1);
+  } finally {
+    await close();
+  }
+};
+
+run();