diff --git a/internal/db/migrations/migration.go b/internal/db/migrations/migration.go
index fac2eb6..e4c0b13 100644
--- a/internal/db/migrations/migration.go
+++ b/internal/db/migrations/migration.go
@@ -6,5 +6,12 @@ import (
 
 func MigrateDatabase(db *gorm.DB) error {
 	// v1.0.13 修复请求日志数据
-	return V1_0_13_FixRequestLogs(db)
+	if err := V1_0_13_FixRequestLogs(db); err != nil {
+		return err
+	}
+	// v1.0.16 增加 key_value 字段长度
+	if err := V1_0_16_IncreaseKeyValueLength(db); err != nil {
+		return err
+	}
+	return nil
 }
diff --git a/internal/db/migrations/v1.0.16_increase_key_value_length.go b/internal/db/migrations/v1.0.16_increase_key_value_length.go
new file mode 100644
index 0000000..0c232c1
--- /dev/null
+++ b/internal/db/migrations/v1.0.16_increase_key_value_length.go
@@ -0,0 +1,47 @@
+package db
+
+import (
+	"fmt"
+
+	"gorm.io/gorm"
+)
+
+// V1_0_16_IncreaseKeyValueLength migrates the key_value column length.
+func V1_0_16_IncreaseKeyValueLength(db *gorm.DB) error {
+	if err := alterColumnType(db, "api_keys", "key_value", "varchar(1024)"); err != nil {
+		return fmt.Errorf("failed to migrate api_keys table: %w", err)
+	}
+
+	if err := alterColumnType(db, "request_logs", "key_value", "varchar(1024)"); err != nil {
+		return fmt.Errorf("failed to migrate request_logs table: %w", err)
+	}
+
+	return nil
+}
+
+func alterColumnType(db *gorm.DB, tableName, columnName, newType string) error {
+	var currentType string
+	switch db.Dialector.Name() {
+	case "sqlite":
+		return nil
+	case "mysql":
+		err := db.Raw("SELECT COLUMN_TYPE FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = ? AND TABLE_NAME = ? AND COLUMN_NAME = ?",
+			db.Migrator().CurrentDatabase(), tableName, columnName).Scan(&currentType).Error
+		if err != nil {
+			return err
+		}
+		if currentType == newType {
+			return nil
+		}
+		return db.Exec(fmt.Sprintf("ALTER TABLE %s MODIFY COLUMN %s %s", tableName, columnName, newType)).Error
+	case "postgres":
+		err := db.Raw("SELECT data_type FROM information_schema.columns WHERE table_name = ? AND column_name = ?",
+			tableName, columnName).Scan(&currentType).Error
+		if err != nil {
+			return err
+		}
+		return db.Exec(fmt.Sprintf("ALTER TABLE %s ALTER COLUMN %s TYPE %s", tableName, columnName, newType)).Error
+	default:
+		return nil
+	}
+}