Consulting Service for Database (Saas) Application

Hello, at this time I create for my new webapplication (Saas) concept the requirement specification. Now i need someone who can help me to find the right answer of my open question. Especially for... - Which database we must use for this application? relating to security, database backup, speed, high appearance data, data integrity, scalability etc. At this time we thinking about mysql or postgresql? - Which framework is expedient for the webapplication or not maybe required. If you have any questions please do not hesitate to contact me. Your experience must min. 3 Years in PHP 3-4 Yeards in MySQL 3-4 Yeards in PostgreSQL 1-2 Yeards in another Database 3-4 Years in Database Modelling 3-4 Years in Zend Framework 1-2 Years in another Framework System advantage - SaaS experience, Oracle, another Framework Best Regards Khalid Skills Required: PHP, MySQL, PostgreSQL, Zend