feat(api): implement secure portfolio history, daily FX and atomic backups

apps/api/scripts/db-preflight.cjs

@@ -1,3 +1,40 @@
-require('dotenv').config({quiet:true});
-const mysql=require('mysql2/promise');
-(async()=>{let db;try {const u=new URL(process.env.DATABASE_URL);const name=u.pathname.slice(1);if(!/^[a-zA-Z0-9_]+$/.test(name))throw Error();db=await mysql.createConnection({host:u.hostname,port:Number(u.port||3306),user:decodeURIComponent(u.username),password:decodeURIComponent(u.password)});const [existing]=await db.execute('SELECT SCHEMA_NAME FROM information_schema.SCHEMATA WHERE SCHEMA_NAME=?',[name]);if(existing.length){const [tables]=await db.execute('SELECT TABLE_NAME FROM information_schema.TABLES WHERE TABLE_SCHEMA=?',[name]);console.log('Database already exists; tables:',tables.map(t=>t.TABLE_NAME));}else {await db.query('CREATE DATABASE `'+name+'` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci');console.log('Created new empty project database.');}}catch(e){console.error('Database preflight failed:',e.code||'configuration error');process.exitCode=1;}finally{if(db)await db.end();}})();
+require('dotenv').config({ quiet: true });
+const mysql = require('mysql2/promise');
+(async () => {
+  let db;
+  try {
+    const u = new URL(process.env.DATABASE_URL);
+    const name = u.pathname.slice(1);
+    if (!/^[a-zA-Z0-9_]+$/.test(name)) throw Error();
+    db = await mysql.createConnection({
+      host: u.hostname,
+      port: Number(u.port || 3306),
+      user: decodeURIComponent(u.username),
+      password: decodeURIComponent(u.password),
+    });
+    const [existing] = await db.execute(
+      'SELECT SCHEMA_NAME FROM information_schema.SCHEMATA WHERE SCHEMA_NAME=?',
+      [name],
+    );
+    if (existing.length) {
+      const [tables] = await db.execute(
+        'SELECT TABLE_NAME FROM information_schema.TABLES WHERE TABLE_SCHEMA=?',
+        [name],
+      );
+      console.log(
+        'Database already exists; tables:',
+        tables.map((t) => t.TABLE_NAME),
+      );
+    } else {
+      await db.query(
+        'CREATE DATABASE `' + name + '` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci',
+      );
+      console.log('Created new empty project database.');
+    }
+  } catch (e) {
+    console.error('Database preflight failed:', e.code || 'configuration error');
+    process.exitCode = 1;
+  } finally {
+    if (db) await db.end();
+  }
+})();