refactor: migrate from node-sqlite3-wasm to better-sqlite3

Replace all db.run(sql, [params]) calls with db.prepare(sql).run(...params)
across all source modules and test files. Also remove the node-sqlite3-wasm
import from tests/db.test.ts and update the type annotation accordingly.

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

display/middleware/tests/api/auth.test.ts

@@ -8,10 +8,9 @@ beforeAll(() => {
   const db = initDb(':memory:');
   // Create a test user
   const hash = bcrypt.hashSync('correctpassword', 10);
-  db.run(
-    `INSERT INTO users (username, password_hash) VALUES (?, ?)`,
-    ['testuser', hash]
-  );
+  db.prepare(
+    `INSERT INTO users (username, password_hash) VALUES (?, ?)`
+  ).run('testuser', hash);
 });
 
 afterAll(() => {

display/middleware/tests/api/display-api.test.ts

@@ -9,22 +9,22 @@ beforeAll(() => {
   const db = initDb(':memory:');
 
   // Create a layout
-  db.run(
+  db.prepare(
     `INSERT INTO layouts (id, name, type, width, height)
      VALUES (1, 'Test Layout', 'free', 800, 480)`
-  );
+  ).run();
 
   // Display without token
-  db.run(
+  db.prepare(
     `INSERT INTO displays (id, name, layout_id, refresh_sec)
      VALUES (1, 'Open Display', 1, 60)`
-  );
+  ).run();
 
   // Display with token auth
-  db.run(
+  db.prepare(
     `INSERT INTO displays (id, name, layout_id, api_token, refresh_sec)
      VALUES (2, 'Secure Display', 1, 'secret-token-123', 300)`
-  );
+  ).run();
 });
 
 afterAll(() => {

display/middleware/tests/db.test.ts

@@ -1,8 +1,8 @@
 import { describe, it, expect, beforeAll, afterAll } from 'vitest';
-import { Database } from 'node-sqlite3-wasm';
+import type Database from 'better-sqlite3';
 import { initDb, closeDb } from '../src/db/index';
 
-let db: Database;
+let db: InstanceType<typeof Database>;
 
 beforeAll(() => {
   db = initDb(':memory:');
@@ -96,10 +96,9 @@ describe('Table creation', () => {
 
 describe('Broker insert and retrieve', () => {
   it('should insert and retrieve a broker', () => {
-    const result = db.run(
-      `INSERT INTO mqtt_brokers (name, host, port) VALUES (?, ?, ?)`,
-      ['Test Broker', 'mqtt.example.com', 1883]
-    );
+    const result = db.prepare(
+      `INSERT INTO mqtt_brokers (name, host, port) VALUES (?, ?, ?)`
+    ).run('Test Broker', 'mqtt.example.com', 1883);
     expect(result.lastInsertRowid).toBeGreaterThan(0);
 
     const broker = db
@@ -119,22 +118,22 @@ describe('Broker insert and retrieve', () => {
   });
 
   it('should cascade delete topics when broker is deleted', () => {
-    const broker = db.run(`INSERT INTO mqtt_brokers (name, host) VALUES (?, ?)`, [
+    const broker = db.prepare(`INSERT INTO mqtt_brokers (name, host) VALUES (?, ?)`).run(
       'Cascade Broker',
       'cascade.example.com',
-    ]);
+    );
 
-    db.run(`INSERT INTO mqtt_topics (broker_id, topic) VALUES (?, ?)`, [
+    db.prepare(`INSERT INTO mqtt_topics (broker_id, topic) VALUES (?, ?)`).run(
       broker.lastInsertRowid,
       'sensors/temp',
-    ]);
+    );
 
     const topicsBefore = db
       .prepare(`SELECT * FROM mqtt_topics WHERE broker_id = ?`)
       .all(broker.lastInsertRowid);
     expect(topicsBefore.length).toBe(1);
 
-    db.run(`DELETE FROM mqtt_brokers WHERE id = ?`, [broker.lastInsertRowid]);
+    db.prepare(`DELETE FROM mqtt_brokers WHERE id = ?`).run(broker.lastInsertRowid);
 
     const topicsAfter = db
       .prepare(`SELECT * FROM mqtt_topics WHERE broker_id = ?`)
@@ -144,10 +143,9 @@ describe('Broker insert and retrieve', () => {
 
   it('should reject invalid source_type values', () => {
     expect(() => {
-      db.run(
-        `INSERT INTO datapoints (name, label, source_type, source_id) VALUES (?, ?, ?, ?)`,
-        ['dp1', 'Datapoint 1', 'invalid_source', 1]
-      );
+      db.prepare(
+        `INSERT INTO datapoints (name, label, source_type, source_id) VALUES (?, ?, ?, ?)`
+      ).run('dp1', 'Datapoint 1', 'invalid_source', 1);
     }).toThrow();
   });
 });

display/middleware/tests/display-builder.test.ts

@@ -6,48 +6,48 @@ beforeAll(() => {
   const db = initDb(':memory:');
 
   // Create a layout
-  db.run(
+  db.prepare(
     `INSERT INTO layouts (id, name, type, width, height, grid_cols, grid_rows)
      VALUES (1, 'Test Layout', 'grid', 800, 480, 2, 3)`
-  );
+  ).run();
 
   // Create a display with the layout
-  db.run(
+  db.prepare(
     `INSERT INTO displays (id, name, layout_id, refresh_sec)
      VALUES (1, 'Test Display', 1, 60)`
-  );
+  ).run();
 
   // Create a display without layout
-  db.run(
+  db.prepare(
     `INSERT INTO displays (id, name, layout_id, refresh_sec)
      VALUES (2, 'Empty Display', NULL, 300)`
-  );
+  ).run();
 
   // Create a broker and topic for datapoint
-  db.run(
+  db.prepare(
     `INSERT INTO mqtt_brokers (id, name, host) VALUES (1, 'Test Broker', 'localhost')`
-  );
-  db.run(
+  ).run();
+  db.prepare(
     `INSERT INTO mqtt_topics (id, broker_id, topic) VALUES (1, 1, 'sensors/temp')`
-  );
+  ).run();
 
   // Create a datapoint
-  db.run(
+  db.prepare(
     `INSERT INTO datapoints (id, name, label, unit, value, source_type, source_id, topic_id, enabled)
      VALUES (1, 'temperature', 'Temperature', '°C', '22.5', 'mqtt', 1, 1, 1)`
-  );
+  ).run();
 
   // Create layout elements
   // Label element
-  db.run(
+  db.prepare(
     `INSERT INTO layout_elements (id, layout_id, type, x, y, static_text, sort_order)
      VALUES (1, 1, 'label', 0, 0, 'Hello World', 0)`
-  );
+  ).run();
   // Value element linked to datapoint
-  db.run(
+  db.prepare(
     `INSERT INTO layout_elements (id, layout_id, datapoint_id, type, x, y, font_size, sort_order)
      VALUES (2, 1, 1, 'value', 100, 0, 32, 1)`
-  );
+  ).run();
 });
 
 afterAll(() => {