LIFECYCLE STAGES:
Contact = Contact exists in database.
MQL (Lead) = Any contact that has submitted any kind of form (likely a company, but not confirmed)
SQL = Any COMPANY that has signed up for a demo or scheduled a sales call of any kind.
Opportunity = Any SQL or Company that has created a profile.
Customer = Any Opportunity that has posted a job. Active Client = Any Customer that has filled a job that remains active.
Past Client = If Client only has one job and it gets closed, that Client will become a Past Client