Ok, nearly 40+ years after taking my first flight I am finally thinking I might want to create some sort of database based on whatever historic data I have from emails/pdfs of travel bookings.

If starting from scratch, what tool would you use? I tend to lean towards open source solutions with documented data models and/or code base to maintain some level of control over access to my data. Not sure that there is much (I have briefly looked at openflights.org, but the home page seems to be 50% ads and the code on github is a self-described "unholy mess".

Is there a tool that lets me maintain my data in Excel (or rather, Google Sheets) and then upload for visualization purposes?