Updated StaffRecommendation model to extend BaseModel and added validation rules
Updated Pitch model to extend BaseModel and added validation rules
Updated OpportunityTag model to extend BaseModel and added validation rules
Updated HiringManager model to extend BaseModel and added validation rules
Updated FellowSkill model to extend BaseModel and added validation rules
Updated Fellow model to extend BaseModel and added validation rules
Updated AdminNote model to extend BaseModel and added validation rules
Updated Company model validation rules to require yearFounded to have 4 digits