Remove id autogeneration from db models

Remove automatic uuid v4 ID generation from the models and replace it
with `shared.NewId()`, which generates an Id depending on the config
setting

shared/ids.go

@@ -3,15 +3,21 @@ package shared
 import (
 	"github.com/google/uuid"
 	"github.com/nrednav/cuid2"
+	"github.com/rs/xid"
 
 	"git.mstar.dev/mstar/linstrom/config"
 )
 
 // Generate a new string ID
 func NewId() string {
-	if config.GlobalConfig.Experimental.UseCuid2Ids {
-		return cuid2.Generate()
-	} else {
+	switch config.GlobalConfig.Experimental.IdGenerator {
+	case "uuid":
 		return uuid.NewString()
+	case "cuid":
+		return cuid2.Generate()
+	case "xid":
+		return xid.New().String()
+	default:
+		return xid.New().String()
 	}
 }