diff --git a/src/main/java/a8k/db/MdbOption.java b/src/main/java/a8k/db/MdbOption.java
new file mode 100644
index 0000000..ca766bd
--- /dev/null
+++ b/src/main/java/a8k/db/MdbOption.java
@@ -0,0 +1,84 @@
+package a8k.db;
+import com.iflytop.uf.UfActiveRecord;
+import com.iflytop.uf.UfActiveRecordField;
+import java.util.Map;
+public class MdbOption extends UfActiveRecord {
+    @UfActiveRecordField
+    public String key;
+
+    @UfActiveRecordField
+    public String value;
+
+    @UfActiveRecordField
+    public String comment;
+
+    @UfActiveRecordField
+    public String editable;
+
+    @UfActiveRecordField
+    public String dataType;
+
+    @UfActiveRecordField
+    public String unit;
+
+    // get table name
+    public static String getTableName() {
+        return "app_options";
+    }
+
+    // get option
+    public static String getString(String key, String defaultValue ) {
+        var option = UfActiveRecord.findOne(MdbOption.class, Map.of("key", key));
+        if ( null == option ) {
+            return defaultValue;
+        }
+        return option.value;
+    }
+
+    // get option string
+    public static String getString( String key ) {
+        var option = UfActiveRecord.findOne(MdbOption.class, Map.of("key", key));
+        if ( null == option ) {
+            throw new RuntimeException("Option not found : " + key);
+        }
+        return option.value;
+    }
+
+    // get option
+    public static Integer getInteger(String key, Integer defaultValue ) {
+        var option = MdbOption.getString(key, defaultValue.toString());
+        return Integer.parseInt(option);
+    }
+
+    // get option
+    public static Integer getInteger( String key ) {
+        var option = MdbOption.getString(key);
+        return Integer.parseInt(option);
+    }
+
+    // get option
+    public static Double getDouble(String key, Double defaultValue ) {
+        var option = MdbOption.getString(key, defaultValue.toString());
+        return Double.parseDouble(option);
+    }
+
+    // get option value as double
+    public static Double getDouble( String key ) {
+        var option = MdbOption.getString(key);
+        return Double.parseDouble(option);
+    }
+
+    // get as boolean
+    public static Boolean getBoolean( String key, Boolean defaultValue ) {
+        var option = MdbOption.getString(key, defaultValue ? "1" : "0");
+        option = option.toLowerCase();
+        return "1".equals(option) || "true".equals(option) || "yes".equals(option) || "on".equals(option);
+    }
+
+    // get option value as boolean
+    public static Boolean getBoolean( String key ) {
+        var option = MdbOption.getString(key);
+        option = option.toLowerCase();
+        return "1".equals(option) || "true".equals(option) || "yes".equals(option) || "on".equals(option);
+    }
+}
diff --git a/src/main/java/a8k/db/MdbUser.java b/src/main/java/a8k/db/MdbUser.java
new file mode 100644
index 0000000..48567f0
--- /dev/null
+++ b/src/main/java/a8k/db/MdbUser.java
@@ -0,0 +1,51 @@
+package a8k.db;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.iflytop.uf.UfActiveRecord;
+import com.iflytop.uf.UfActiveRecordField;
+import org.springframework.util.DigestUtils;
+public class MdbUser extends UfActiveRecord {
+    @UfActiveRecordField
+    public String account;
+
+    @JsonIgnore
+    @UfActiveRecordField
+    public String password;
+
+    @JsonIgnore
+    @UfActiveRecordField
+    public String salt;
+
+    @UfActiveRecordField
+    public Integer isAdmin;
+
+    @UfActiveRecordField
+    public Integer createdAt;
+
+    @UfActiveRecordField
+    public String createdBy;
+
+    @JsonIgnore
+    @UfActiveRecordField
+    public String accessToken;
+
+    @JsonIgnore
+    @UfActiveRecordField
+    public Integer accessTokenExpiredAt;
+
+    // get table name
+    public static String getTableName() {
+        return "app_users";
+    }
+
+    // check if password matches
+    public Boolean matchPassword(String password) {
+        String hash = this.hashPassword(password);
+        return this.password.equals(hash);
+    }
+
+    // hash password
+    public String hashPassword(String password) {
+        String salt = this.salt;
+        return DigestUtils.md5DigestAsHex((salt + password + salt).getBytes());
+    }
+}