fix: Text's created_at type

databases/Text.go

@@ -1,8 +1,6 @@
 package databases
 
 import (
-	"time"
-
 	"go.mongodb.org/mongo-driver/v2/bson"
 	"go.mongodb.org/mongo-driver/v2/mongo"
 )
@@ -11,7 +9,7 @@ type Text struct {
 	Id        bson.ObjectID `bson:"_id"`
 	Text      string
 	Persona   string
-	CreatedAt time.Time `bson:"created_at"`
+	CreatedAt bson.DateTime `bson:"created_at"`
 }
 
 var Texts *mongo.Collection = Client.Database("muffin_ai_test").Collection("text")