fix: ensure all timestamps use UTC timezone

- Add NowFunc to GORM config for UTC auto-generated timestamps
- Add .UTC() to all time.UnixMilli() calls in trader files
- Add .UTC() to all time.Now() calls in store and api files
- Fix TypeScript unused imports in frontend

store/ai_model.go

@@ -149,7 +149,7 @@ func (s *AIModelStore) Update(userID, id string, enabled bool, apiKey, customAPI
 			"enabled":           enabled,
 			"custom_api_url":    customAPIURL,
 			"custom_model_name": customModelName,
-			"updated_at":        time.Now(),
+			"updated_at":        time.Now().UTC(),
 		}
 		// If apiKey is not empty, update it (encryption handled by crypto.EncryptedString)
 		if apiKey != "" {
@@ -167,7 +167,7 @@ func (s *AIModelStore) Update(userID, id string, enabled bool, apiKey, customAPI
 			"enabled":           enabled,
 			"custom_api_url":    customAPIURL,
 			"custom_model_name": customModelName,
-			"updated_at":        time.Now(),
+			"updated_at":        time.Now().UTC(),
 		}
 		if apiKey != "" {
 			updates["api_key"] = crypto.EncryptedString(apiKey)

store/exchange.go

@@ -236,7 +236,7 @@ func (s *ExchangeStore) Update(userID, id string, enabled bool, apiKey, secretKe
 		"aster_signer":            asterSigner,
 		"lighter_wallet_addr":     lighterWalletAddr,
 		"lighter_api_key_index":   lighterApiKeyIndex,
-		"updated_at":              time.Now(),
+		"updated_at":              time.Now().UTC(),
 	}
 
 	// Only update encrypted fields if not empty
@@ -275,7 +275,7 @@ func (s *ExchangeStore) UpdateAccountName(userID, id, accountName string) error
 		Where("id = ? AND user_id = ?", id, userID).
 		Updates(map[string]interface{}{
 			"account_name": accountName,
-			"updated_at":   time.Now(),
+			"updated_at":   time.Now().UTC(),
 		})
 	if result.Error != nil {
 		return result.Error

store/gorm.go

@@ -2,6 +2,7 @@ package store
 
 import (
 	"fmt"
+	"time"
 
 	"gorm.io/driver/postgres"
 	"gorm.io/driver/sqlite"
@@ -21,6 +22,10 @@ func DB() *gorm.DB {
 func InitGorm(dbPath string) (*gorm.DB, error) {
 	db, err := gorm.Open(sqlite.Open(dbPath), &gorm.Config{
 		Logger: logger.Default.LogMode(logger.Silent),
+		// Use UTC for all auto-generated timestamps (autoCreateTime, autoUpdateTime)
+		NowFunc: func() time.Time {
+			return time.Now().UTC()
+		},
 	})
 	if err != nil {
 		return nil, fmt.Errorf("failed to open SQLite database: %w", err)
@@ -53,6 +58,10 @@ func InitGormPostgres(host string, port int, user, password, dbname, sslmode str
 
 	db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{
 		Logger: logger.Default.LogMode(logger.Silent),
+		// Use UTC for all auto-generated timestamps (autoCreateTime, autoUpdateTime)
+		NowFunc: func() time.Time {
+			return time.Now().UTC()
+		},
 	})
 	if err != nil {
 		return nil, fmt.Errorf("failed to open PostgreSQL database: %w", err)

store/position_builder.go

@@ -69,8 +69,8 @@ func (pb *PositionBuilder) handleOpen(
 			Status:             "OPEN",
 			Source:             "sync",
 			Fee:                fee,
-			CreatedAt:          time.Now(),
-			UpdatedAt:          time.Now(),
+			CreatedAt:          time.Now().UTC(),
+			UpdatedAt:          time.Now().UTC(),
 		}
 		return pb.positionStore.CreateOpenPosition(position)
 	}

store/strategy.go

@@ -328,7 +328,7 @@ func (s *StrategyStore) Update(strategy *Strategy) error {
 			"config":         strategy.Config,
 			"is_public":      strategy.IsPublic,
 			"config_visible": strategy.ConfigVisible,
-			"updated_at":     time.Now(),
+			"updated_at":     time.Now().UTC(),
 		}).Error
 }
 

store/user.go

@@ -123,7 +123,7 @@ func (s *UserStore) UpdateOTPVerified(userID string, verified bool) error {
 func (s *UserStore) UpdatePassword(userID, passwordHash string) error {
 	return s.db.Model(&User{}).Where("id = ?", userID).Updates(map[string]interface{}{
 		"password_hash": passwordHash,
-		"updated_at":    time.Now(),
+		"updated_at":    time.Now().UTC(),
 	}).Error
 }