Add multi-player and remote bridge support

src/db/index.js

@@ -1,6 +1,18 @@
 // Snapshot only: keep this file aligned with the current schema state.
 async function ensureSchema(pool, options) {
-  await pool.query(`
+  const schemaLockName = 'pulse_signage_schema_lock';
+  const schemaConnection = await pool.getConnection();
+
+  try {
+    pool = schemaConnection;
+
+    const [lockRows] = await pool.query('SELECT GET_LOCK(?, 120) AS lock_acquired', [schemaLockName]);
+    if (!Number(lockRows && lockRows[0] && lockRows[0].lock_acquired)) {
+      throw new Error('Unable to acquire the schema migration lock.');
+    }
+
+    try {
+      await pool.query(`
     CREATE TABLE IF NOT EXISTS c_canvas_sizes (
       id INT AUTO_INCREMENT PRIMARY KEY,
       name VARCHAR(255) NOT NULL,
@@ -116,13 +128,24 @@ async function ensureSchema(pool, options) {
     ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
   `);
 
+  await pool.query(`
+    CREATE TABLE IF NOT EXISTS d_players (
+      id INT AUTO_INCREMENT PRIMARY KEY,
+      identifier VARCHAR(128) NOT NULL UNIQUE,
+      public_base_url VARCHAR(512) NULL,
+      internal_base_url VARCHAR(512) NULL,
+      last_seen_at TIMESTAMP NULL,
+      created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+      modified_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
+  `);
+
   await pool.query(`
     CREATE TABLE IF NOT EXISTS d_screens (
       id INT AUTO_INCREMENT PRIMARY KEY,
       name VARCHAR(255) NOT NULL,
       slug VARCHAR(255) NOT NULL UNIQUE,
       playlist_id INT NULL,
-      player_id INT NULL,
       created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
       created_by INT NULL,
       modified_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
@@ -360,8 +383,15 @@ async function ensureSchema(pool, options) {
     ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
   `);
 
-  const { runMigrations } = require('./migrations');
-  await runMigrations(pool, options);
+      const { runMigrations } = require('./migrations');
+      await runMigrations(pool, options);
+    } finally {
+      await pool.query('SELECT RELEASE_LOCK(?)', [schemaLockName]).catch(function () {
+      });
+    }
+  } finally {
+    schemaConnection.release();
+  }
 }
 
 module.exports = {