Google Sheets Call Routing Automation

I have a raw list of about 10,000 phone numbers that needs to live in a single “Master” tab inside Google Sheets. From there, every time I type a note in the Call Notes column, that row must instantly... (Budget: £20 - £250 GBP, Jobs: Data Analysis, Data Management, Data Processing, Excel, Excel VBA, Google App Engine, Google Sheets, Software Architecture)