diff --git a/model/main.go b/model/main.go
index 21a5d4c08..f37cb667c 100644
--- a/model/main.go
+++ b/model/main.go
@@ -250,6 +250,10 @@ func InitLogDB() (err error) {
 func migrateDB() error {
 	// Migrate price_amount column from float/double to decimal for existing tables
 	migrateSubscriptionPlanPriceAmount()
+	// Migrate model_limits column from varchar to text for existing tables
+	if err := migrateTokenModelLimitsToText(); err != nil {
+		return err
+	}
 
 	err := DB.AutoMigrate(
 		&Channel{},
@@ -445,6 +449,59 @@ PRIMARY KEY (` + "`id`" + `)
 	return nil
 }
 
+// migrateTokenModelLimitsToText migrates model_limits column from varchar(1024) to text
+// This is safe to run multiple times - it checks the column type first
+func migrateTokenModelLimitsToText() error {
+	// SQLite uses type affinity, so TEXT and VARCHAR are effectively the same — no migration needed
+	if common.UsingSQLite {
+		return nil
+	}
+
+	tableName := "tokens"
+	columnName := "model_limits"
+
+	if !DB.Migrator().HasTable(tableName) {
+		return nil
+	}
+
+	if !DB.Migrator().HasColumn(&Token{}, columnName) {
+		return nil
+	}
+
+	var alterSQL string
+	if common.UsingPostgreSQL {
+		var dataType string
+		if err := DB.Raw(`SELECT data_type FROM information_schema.columns
+			WHERE table_schema = current_schema() AND table_name = ? AND column_name = ?`,
+			tableName, columnName).Scan(&dataType).Error; err != nil {
+			common.SysLog(fmt.Sprintf("Warning: failed to query metadata for %s.%s: %v", tableName, columnName, err))
+		} else if dataType == "text" {
+			return nil
+		}
+		alterSQL = fmt.Sprintf(`ALTER TABLE %s ALTER COLUMN %s TYPE text`, tableName, columnName)
+	} else if common.UsingMySQL {
+		var columnType string
+		if err := DB.Raw(`SELECT COLUMN_TYPE FROM information_schema.columns
+				WHERE table_schema = DATABASE() AND table_name = ? AND column_name = ?`,
+			tableName, columnName).Scan(&columnType).Error; err != nil {
+			common.SysLog(fmt.Sprintf("Warning: failed to query metadata for %s.%s: %v", tableName, columnName, err))
+		} else if strings.ToLower(columnType) == "text" {
+			return nil
+		}
+		alterSQL = fmt.Sprintf("ALTER TABLE %s MODIFY COLUMN %s text", tableName, columnName)
+	} else {
+		return nil
+	}
+
+	if alterSQL != "" {
+		if err := DB.Exec(alterSQL).Error; err != nil {
+			return fmt.Errorf("failed to migrate %s.%s to text: %w", tableName, columnName, err)
+		}
+		common.SysLog(fmt.Sprintf("Successfully migrated %s.%s to text", tableName, columnName))
+	}
+	return nil
+}
+
 // migrateSubscriptionPlanPriceAmount migrates price_amount column from float/double to decimal(10,6)
 // This is safe to run multiple times - it checks the column type first
 func migrateSubscriptionPlanPriceAmount() {
@@ -471,9 +528,11 @@ func migrateSubscriptionPlanPriceAmount() {
 	if common.UsingPostgreSQL {
 		// PostgreSQL: Check if already decimal/numeric
 		var dataType string
-		DB.Raw(`SELECT data_type FROM information_schema.columns 
-			WHERE table_name = ? AND column_name = ?`, tableName, columnName).Scan(&dataType)
-		if dataType == "numeric" {
+		if err := DB.Raw(`SELECT data_type FROM information_schema.columns
+			WHERE table_schema = current_schema() AND table_name = ? AND column_name = ?`,
+			tableName, columnName).Scan(&dataType).Error; err != nil {
+			common.SysLog(fmt.Sprintf("Warning: failed to query metadata for %s.%s: %v", tableName, columnName, err))
+		} else if dataType == "numeric" {
 			return // Already decimal/numeric
 		}
 		alterSQL = fmt.Sprintf(`ALTER TABLE %s ALTER COLUMN %s TYPE decimal(10,6) USING %s::decimal(10,6)`,
@@ -481,10 +540,11 @@ func migrateSubscriptionPlanPriceAmount() {
 	} else if common.UsingMySQL {
 		// MySQL: Check if already decimal
 		var columnType string
-		DB.Raw(`SELECT COLUMN_TYPE FROM information_schema.columns 
-			WHERE table_schema = DATABASE() AND table_name = ? AND column_name = ?`,
-			tableName, columnName).Scan(&columnType)
-		if strings.HasPrefix(strings.ToLower(columnType), "decimal") {
+		if err := DB.Raw(`SELECT COLUMN_TYPE FROM information_schema.columns
+				WHERE table_schema = DATABASE() AND table_name = ? AND column_name = ?`,
+			tableName, columnName).Scan(&columnType).Error; err != nil {
+			common.SysLog(fmt.Sprintf("Warning: failed to query metadata for %s.%s: %v", tableName, columnName, err))
+		} else if strings.HasPrefix(strings.ToLower(columnType), "decimal") {
 			return // Already decimal
 		}
 		alterSQL = fmt.Sprintf("ALTER TABLE %s MODIFY COLUMN %s decimal(10,6) NOT NULL DEFAULT 0",
diff --git a/model/token.go b/model/token.go
index 773b2d792..1c9ad3ed7 100644
--- a/model/token.go
+++ b/model/token.go
@@ -23,7 +23,7 @@ type Token struct {
 	RemainQuota        int            `json:"remain_quota" gorm:"default:0"`
 	UnlimitedQuota     bool           `json:"unlimited_quota"`
 	ModelLimitsEnabled bool           `json:"model_limits_enabled"`
-	ModelLimits        string         `json:"model_limits" gorm:"type:varchar(1024);default:''"`
+	ModelLimits        string         `json:"model_limits" gorm:"type:text"`
 	AllowIps           *string        `json:"allow_ips" gorm:"default:''"`
 	UsedQuota          int            `json:"used_quota" gorm:"default:0"` // used quota
 	Group              string         `json:"group" gorm:"default:''"`