* add database to project. Seed data. Update customerId to customer_id
* seed customers table data
* use database everywhere
* refactor
* fix ts lint errors
* add type to invoice edit page
* remove fetch-data file and fetch data directly in components
* update lates invoices to use sql
* in invoice table, search the database here with SQL
* rename tsx files to ts and add node script to seed data
* address rest of PR comments
* move all data fetches to own file
* add types to filter invoices function
* remove unused param
* prettier
* update function names
