Here are some precautionary measures you can follow to safeguard your database from SQL injection attacts:
1. Keep your database server up to date with latest security patches from vendors.
2. Use the principle of least privilege to ensure you don't give insert, update, or delete permissions to just about anyone.
3. Avoid using shared database accounts between different websites/web applications.
4. Never forget to validate user-supplied before using it. They often induce most common risks of SQL injection attacks.
5. Regularly scan your database for any potential issues from time to time.