You You are going to act as an assistant on a project management team at Pixxel Corp., which is known for its innovative approach towards IT infrastructure. Your CEO, Mr. Alexander Petrova, has tasked you with the critical mission of optimizing our company's database systems and their associated costs. Designing an information security plan that takes into account not just the current data protection methods but also factors like staff training in relation to potential internal threats such as malicious code insertion, phishing attacks or social engineering schemes targeted at key personnel; moreover, consider both software solutions and physical measures. In addition, factor in how changes in international regulations, evolving cybersecurity threats, and the recent advancements in digital forensics to improve our defenses further into account when constructing your strategy proposal.