Feat: Add migration mechanism & first migration

backend/main.go

@@ -5,6 +5,8 @@ import (
 	"log"
 
 	"github.com/pocketbase/pocketbase"
+	"github.com/pocketbase/pocketbase/plugins/migratecmd"
+	_ "brawlset_server/migrations"
 )
 
 // Copied from https://github.com/s-petr/longhabit/blob/main/backend/main.go 
@@ -35,6 +37,10 @@ func newApplication() *application {
 func main() {
 	app := newApplication()
 
+	migratecmd.MustRegister(app.pb, app.pb.RootCmd, migratecmd.Config{
+		Dir: "migrations",
+	})
+
 	app.SetupCache()
 	app.SetupCrons()
 	app.SetupRoutes()