refactor: Update data models to use pointer fields for optional values and add atomic database operations for video views and user storage.

internal/api/auth/auth.go

@@ -60,17 +60,17 @@ func (h *handler) Login(c *gin.Context) {
 	}
 
 	// Verify password (if user has password, google users might not)
-	if user.Password == "" {
+	if user.Password == nil || *user.Password == "" {
 		response.Error(c, http.StatusUnauthorized, "Please login with Google")
 		return
 	}
 
-	if err := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(req.Password)); err != nil {
+	if err := bcrypt.CompareHashAndPassword([]byte(*user.Password), []byte(req.Password)); err != nil {
 		response.Error(c, http.StatusUnauthorized, "Invalid credentials")
 		return
 	}
 
-	h.generateAndSetTokens(c, user.ID, user.Email, user.Role)
+	h.generateAndSetTokens(c, user.ID, user.Email, *user.Role)
 	response.Success(c, gin.H{"user": user})
 }
 
@@ -111,12 +111,14 @@ func (h *handler) Register(c *gin.Context) {
 		return
 	}
 
+	password := string(hashedPassword)
+	role := "USER"
 	newUser := &model.User{
 		ID:       uuid.New().String(),
 		Email:    req.Email,
-		Password: string(hashedPassword),
-		Username: req.Username,
-		Role:     "USER",
+		Password: &password,
+		Username: &req.Username,
+		Role:     &role,
 	}
 
 	if err := u.WithContext(c.Request.Context()).Create(newUser); err != nil {
@@ -226,23 +228,24 @@ func (h *handler) GoogleCallback(c *gin.Context) {
 	u := query.User
 	user, err := u.WithContext(c.Request.Context()).Where(u.Email.Eq(googleUser.Email)).First()
 	if err != nil {
+		role := "USER"
 		user = &model.User{
 			ID:       uuid.New().String(),
 			Email:    googleUser.Email,
-			Username: googleUser.Name,
-			GoogleID: googleUser.ID,
-			Avatar:   googleUser.Picture,
-			Role:     "USER",
+			Username: &googleUser.Name,
+			GoogleID: &googleUser.ID,
+			Avatar:   &googleUser.Picture,
+			Role:     &role,
 		}
 		if err := u.WithContext(c.Request.Context()).Create(user); err != nil {
 			response.Fail(c, "Failed to create user")
 			return
 		}
-	} else if user.GoogleID == "" {
+	} else if user.GoogleID == nil || *user.GoogleID == "" {
 		u.WithContext(c.Request.Context()).Where(u.ID.Eq(user.ID)).Update(u.GoogleID, googleUser.ID)
 	}
 
-	h.generateAndSetTokens(c, user.ID, user.Email, user.Role)
+	h.generateAndSetTokens(c, user.ID, user.Email, *user.Role)
 	response.Success(c, gin.H{"user": user})
 }
 

internal/api/payment/handler.go

@@ -52,13 +52,16 @@ func (h *Handler) CreatePayment(c *gin.Context) {
 	// In a real scenario, we would contact Stripe/PayPal here to create a session
 	// For now, we just create a "PENDING" payment record.
 
+	status := "PENDING"
+	provider := "STRIPE"
+
 	payment := &model.Payment{
 		ID:       uuid.New().String(),
 		UserID:   userID,
-		PlanID:   req.PlanID,
+		PlanID:   &req.PlanID,
 		Amount:   req.Amount,
-		Status:   "PENDING",
-		Provider: "STRIPE", // Defaulting to Stripe for this example
+		Status:   &status,
+		Provider: &provider, // Defaulting to Stripe for this example
 	}
 
 	p := query.Payment

internal/api/video/handler.go

@@ -86,21 +86,41 @@ func (h *Handler) CreateVideo(c *gin.Context) {
 
 	userID := c.GetString("userID")
 
+	status := "PUBLIC"
+	storageType := "S3"
+
 	video := &model.Video{
 		ID:          uuid.New().String(),
 		UserID:      userID,
+		Name:        req.Title,
 		Title:       req.Title,
-		Description: req.Description,
+		Description: &req.Description,
 		URL:         req.URL,
 		Size:        req.Size,
 		Duration:    req.Duration,
 		Format:      req.Format,
-		Status:      "PUBLIC",
-		StorageType: "S3",
+		Status:      &status,
+		StorageType: &storageType,
 	}
 
-	v := query.Video
-	if err := v.WithContext(c.Request.Context()).Create(video); err != nil {
+	q := query.Q
+	err := q.Transaction(func(tx *query.Query) error {
+		if err := tx.Video.WithContext(c.Request.Context()).Create(video); err != nil {
+			return err
+		}
+
+		// Atomic update: StorageUsed = StorageUsed + video.Size
+		// We use UpdateSimple with Add to ensure atomicity at database level: UPDATE users SET storage_used = storage_used + ?
+		if _, err := tx.User.WithContext(c.Request.Context()).
+			Where(tx.User.ID.Eq(userID)).
+			UpdateSimple(tx.User.StorageUsed.Add(video.Size)); err != nil {
+			return err
+		}
+
+		return nil
+	})
+
+	if err != nil {
 		h.logger.Error("Failed to create video record", "error", err)
 		response.Error(c, http.StatusInternalServerError, "Failed to create video")
 		return
@@ -156,6 +176,12 @@ func (h *Handler) ListVideos(c *gin.Context) {
 func (h *Handler) GetVideo(c *gin.Context) {
 	id := c.Param("id")
 	v := query.Video
+
+	// Atomically increment views: UPDATE videos SET views = views + 1 WHERE id = ?
+	// We intentionally ignore errors here (like record not found) because the subsequent fetch will handle 404s,
+	// and we don't want to fail the read if writing the view count fails for some transient reason.
+	v.WithContext(c.Request.Context()).Where(v.ID.Eq(id)).UpdateSimple(v.Views.Add(1))
+
 	video, err := v.WithContext(c.Request.Context()).Where(v.ID.Eq(id)).First()
 	if err != nil {
 		response.Error(c, http.StatusNotFound, "Video not found")