Adicionado opção unique na tabela people_events

Não adiciona a mesma pessoa duas vezes num mesmo evento.

www/js/app.js

@@ -19,10 +19,10 @@ angular.module('app', ['ionic', 'app.controllers', 'app.routes', 'app.services',
       StatusBar.styleDefault();
     }
 
+    // se o banco não existe, cria ele aqui
     var db = $cordovaSQLite.openDB({name: 'ceitificator.db', iosDatabaseLocation: 'default'});
     $cordovaSQLite.execute(db, "CREATE TABLE IF NOT EXISTS people(id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, grr TEXT NOT NULL, email TEXT NOT NULL, UNIQUE (name, grr, email))");
     $cordovaSQLite.execute(db, "CREATE TABLE IF NOT EXISTS events(id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, desc TEXT NOT NULL, date TEXT NOT NULL, place TEXT NOT NULL, hours TEXT NOT NULL, UNIQUE (name, desc, date, place, hours))");
-    $cordovaSQLite.execute(db, "CREATE TABLE IF NOT EXISTS people_events(event_id, person_id, FOREIGN KEY(event_id) REFERENCES events(id), FOREIGN KEY(person_id) REFERENCES people(id))");
-
+    $cordovaSQLite.execute(db, "CREATE TABLE IF NOT EXISTS people_events(event_id, person_id, FOREIGN KEY(event_id) REFERENCES events(id), FOREIGN KEY(person_id) REFERENCES people(id), UNIQUE (person_id, event_id))");
   });
 })