Clients Table Structure:
id - int(11)
first_name - varchar(50)
last_name - varchar(50)
url_name - varchar(255)
email - varchar(100)
phone - varchar(20)
address - text
hourly_rate - decimal(10,2)
retainer_balance - decimal(10,2)
standard_retainer_amount - decimal(10,2)
notes - text
created_at - timestamp
updated_at - timestamp
stripe_customer_id - varchar(100)
billing_email - varchar(255)
payment_method_id - varchar(100)
last_invoice_date - date
current_balance - decimal(10,2)
archived - tinyint(1)
last_billed_date - date
auto_bill - tinyint(1)
billing_threshold - decimal(10,2)