feat: switch database to PostgreSQL (#97)

* feat: switch database to postgresql

* docs: update README.md

Author: RaymondWHZ

README.md

@@ -22,7 +22,7 @@
   - Prisma.js
   - tRPC
   - tailwindcss
-- MySQL (not part of repository)
+- PostgreSQL (not part of repository)
 
 ## Development Guide
 
@@ -58,7 +58,7 @@
 
 ## Deployment
 
-It is recommended to deply using [Vercel](https://vercel.com), simply select Next.js project and fill-in all environment variables will do. Remember to also create a production-ready MySQL database for data persistence. Here is our deployed web [Parachute](https://parachute.fyi).
+It is recommended to deply using [Vercel](https://vercel.com), simply select Next.js project and fill-in all environment variables will do. Remember to also create a production-ready PostgreSQL database for data persistence. Here is our deployed web [Parachute](https://parachute.fyi).
 
 ## Star History
 

prisma/schema.prisma

@@ -3,7 +3,7 @@ generator client {
 }
 
 datasource db {
-  provider     = "mysql"
+  provider     = "postgresql"
   url          = env("DATABASE_URL")
   relationMode = "prisma"
 }