diff --git a/.gitignore b/.gitignore
index 2d69fec..683296e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,3 +42,4 @@ build/
 ri_log*
 test-*.tmp
 .idea/workspace.xml
+.idea/
diff --git a/pom.xml b/pom.xml
index 31a762a..6bc198c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -55,6 +55,12 @@
       <artifactId>quartz</artifactId>
       <version>2.3.2</version>
     </dependency>
+    <dependency>
+      <groupId>org.jetbrains</groupId>
+      <artifactId>annotations</artifactId>
+      <version>RELEASE</version>
+      <scope>compile</scope>
+    </dependency>
   </dependencies>
 
   <build>
diff --git a/src/main/java/org/leolo/nrdatad/App.java b/src/main/java/org/leolo/nrdatad/App.java
index cef45fd..fd6f245 100644
--- a/src/main/java/org/leolo/nrdatad/App.java
+++ b/src/main/java/org/leolo/nrdatad/App.java
@@ -85,5 +85,11 @@ public class App {
             System.exit(1);
             return;
         }
+        loadCronJob();
+    }
+
+    private void loadCronJob() {
+        log.atDebug().log("Start loading cron jobs");
+
     }
 }
diff --git a/src/main/java/org/leolo/nrdatad/db/BaseDao.java b/src/main/java/org/leolo/nrdatad/db/BaseDao.java
new file mode 100644
index 0000000..973961f
--- /dev/null
+++ b/src/main/java/org/leolo/nrdatad/db/BaseDao.java
@@ -0,0 +1,18 @@
+package org.leolo.nrdatad.db;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+
+public abstract class BaseDao {
+
+    private DatabaseManager manager;
+
+    public BaseDao(DatabaseManager manager){
+        this.manager = manager;
+    }
+
+    protected Connection getConnection() throws SQLException{
+        return manager.getConnection();
+    }
+
+}
diff --git a/src/main/java/org/leolo/nrdatad/db/DatabaseManager.java b/src/main/java/org/leolo/nrdatad/db/DatabaseManager.java
index 7e383f3..b738397 100644
--- a/src/main/java/org/leolo/nrdatad/db/DatabaseManager.java
+++ b/src/main/java/org/leolo/nrdatad/db/DatabaseManager.java
@@ -2,6 +2,7 @@ package org.leolo.nrdatad.db;
 
 import java.sql.Connection;
 import java.sql.SQLException;
+import java.util.function.BiConsumer;
 
 public interface DatabaseManager {
 
@@ -10,4 +11,6 @@ public interface DatabaseManager {
     public boolean checkConnection();
 
     public Connection getConnection() throws SQLException;
+
+    public MetadataDao getMetadataDao();
 }
diff --git a/src/main/java/org/leolo/nrdatad/db/MetadataDao.java b/src/main/java/org/leolo/nrdatad/db/MetadataDao.java
new file mode 100644
index 0000000..286c2f6
--- /dev/null
+++ b/src/main/java/org/leolo/nrdatad/db/MetadataDao.java
@@ -0,0 +1,42 @@
+package org.leolo.nrdatad.db;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.jetbrains.annotations.NotNull;
+import org.leolo.nrdatad.ConfigurationManager;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.util.Set;
+import java.util.function.BiConsumer;
+
+public abstract class MetadataDao extends BaseDao {
+
+    Logger log = LogManager.getLogger();
+
+    public MetadataDao(DatabaseManager manager){
+        super(manager);
+    }
+
+    public abstract String getMetadata(String key, String defaultValue) throws SQLException;
+
+    public String getMetadata(String key) throws SQLException{
+        return getMetadata(key, null);
+    }
+
+    public abstract void updateMetadata(String key, @NotNull String value) throws SQLException;
+
+    public abstract Set<String> getKeys() throws SQLException;
+
+    public abstract void forEach(BiConsumer<String, String> action) throws SQLException;
+
+    public boolean containsKey(String key) throws SQLException{
+        return getKeys().contains(key);
+    }
+
+    public int entryCount() throws  SQLException{
+        return getKeys().size();
+    }
+
+}
diff --git a/src/main/java/org/leolo/nrdatad/db/mariadb/DatabaseManager.java b/src/main/java/org/leolo/nrdatad/db/mariadb/DatabaseManager.java
index fab1e79..d27e98f 100644
--- a/src/main/java/org/leolo/nrdatad/db/mariadb/DatabaseManager.java
+++ b/src/main/java/org/leolo/nrdatad/db/mariadb/DatabaseManager.java
@@ -3,6 +3,7 @@ package org.leolo.nrdatad.db.mariadb;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.leolo.nrdatad.ConfigurationManager;
+import org.leolo.nrdatad.db.MetadataDao;
 import org.mariadb.jdbc.MariaDbPoolDataSource;
 
 import java.sql.*;
@@ -57,4 +58,9 @@ public class DatabaseManager implements org.leolo.nrdatad.db.DatabaseManager{
     public Connection getConnection() throws SQLException{
         return ds.getConnection();
     }
+
+    @Override
+    public MetadataDao getMetadataDao() {
+        return new org.leolo.nrdatad.db.mariadb.MetadataDao(this);
+    }
 }
diff --git a/src/main/java/org/leolo/nrdatad/db/mariadb/MetadataDao.java b/src/main/java/org/leolo/nrdatad/db/mariadb/MetadataDao.java
new file mode 100644
index 0000000..6bfb918
--- /dev/null
+++ b/src/main/java/org/leolo/nrdatad/db/mariadb/MetadataDao.java
@@ -0,0 +1,116 @@
+package org.leolo.nrdatad.db.mariadb;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.sql.*;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.TreeMap;
+import java.util.function.BiConsumer;
+
+public class MetadataDao extends org.leolo.nrdatad.db.MetadataDao {
+
+    private static Object SYNC_TOKEN = new Object();
+
+    public MetadataDao(DatabaseManager manager){
+        super(manager);
+    }
+
+    @Override
+    public String getMetadata(String key, String defaultValue) throws SQLException {
+        try(
+                Connection conn = getConnection();
+                PreparedStatement pstmt = conn.prepareStatement("SELECT value FROM metadata WHERE `key` = ?")
+        ){
+            pstmt.setString(1, key);
+            try(ResultSet rs = pstmt.executeQuery()){
+                if(rs.next()){
+                    return rs.getString(1);
+                }
+            }
+        }
+        return defaultValue;
+    }
+
+    @Override
+    public void updateMetadata(@NotNull String key, @NotNull String value) throws SQLException {
+        synchronized (SYNC_TOKEN) {
+            if (containsKey(key)) {
+                try(
+                        Connection conn = getConnection();
+                        PreparedStatement pstmt = conn.prepareStatement("UPDATE metadata SET value = ? WHERE `key` = ?")
+                ){
+                    pstmt.setString(1, value);
+                    pstmt.setString(2, key);
+                    pstmt.executeUpdate();
+                }
+            } else {
+                try(
+                        Connection conn = getConnection();
+                        PreparedStatement pstmt = conn.prepareStatement("INSERT INTO metadata (`key`, value) VALUES (?,?)")
+                ){
+                    pstmt.setString(1, key);
+                    pstmt.setString(2, value);
+                    pstmt.executeUpdate();
+
+                }
+
+            }
+        }
+    }
+
+    @Override
+    public Set<String> getKeys() throws SQLException {
+        HashSet<String> set = new HashSet<>();
+        try(
+                Connection conn = getConnection();
+                Statement stmt = conn.createStatement();
+                ResultSet rs = stmt.executeQuery("SELECT `key` FROM metadata")
+        ){
+            while(rs.next()){
+                set.add(rs.getString(1));
+            }
+        }
+        return set;
+    }
+
+    @Override
+    public void forEach(BiConsumer<String, String> action) throws SQLException {
+        TreeMap<String, String> map = new TreeMap<>();
+        try(
+                Connection conn = getConnection();
+                Statement stmt = conn.createStatement();
+                ResultSet rs = stmt.executeQuery("SELECT `key`, value FROM metadata")
+        ){
+            while(rs.next()){
+                map.put(rs.getString(1), rs.getString(2));
+            }
+        }
+        map.forEach(action);
+    }
+
+    @Override
+    public boolean containsKey(String key) throws SQLException {
+        try(
+                Connection conn = getConnection();
+                PreparedStatement pstmt = conn.prepareStatement("SELECT 1 FROM metadata WHERE `key` = ?")
+        ){
+            pstmt.setString(1, key);
+            try(ResultSet rs = pstmt.executeQuery()){
+                return rs.next();
+            }
+        }
+    }
+
+    @Override
+    public int entryCount() throws SQLException {
+        try(
+                Connection conn = getConnection();
+                Statement stmt = conn.createStatement();
+                ResultSet rs = stmt.executeQuery("SELECT COUNT(1) FROM metadata")
+        ){
+            rs.next();
+            return rs.getInt(1);
+        }
+    }
+}
diff --git a/src/test/java/org/leolo/nrdatad/db/test/DatabaseManager.java b/src/test/java/org/leolo/nrdatad/db/test/DatabaseManager.java
index 8aaacc9..1518226 100644
--- a/src/test/java/org/leolo/nrdatad/db/test/DatabaseManager.java
+++ b/src/test/java/org/leolo/nrdatad/db/test/DatabaseManager.java
@@ -1,8 +1,28 @@
 package org.leolo.nrdatad.db.test;
 
-public class DatabaseManager {
+import org.leolo.nrdatad.db.MetadataDao;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+
+public class DatabaseManager implements org.leolo.nrdatad.db.DatabaseManager {
 
     public void initPool() {
 
     }
+
+    @Override
+    public boolean checkConnection() {
+        return true;
+    }
+
+    @Override
+    public Connection getConnection() throws SQLException {
+        throw new RuntimeException("Function not supported by stub");
+    }
+
+    @Override
+    public MetadataDao getMetadataDao() {
+        return null;
+    }
 }
diff --git a/src/test/java/org/leolo/nrdatad/db/test/MetadataDao.java b/src/test/java/org/leolo/nrdatad/db/test/MetadataDao.java
new file mode 100644
index 0000000..fa66951
--- /dev/null
+++ b/src/test/java/org/leolo/nrdatad/db/test/MetadataDao.java
@@ -0,0 +1,40 @@
+package org.leolo.nrdatad.db.test;
+
+import org.jetbrains.annotations.NotNull;
+import org.leolo.nrdatad.db.DatabaseManager;
+
+import java.sql.SQLException;
+import java.util.HashMap;
+import java.util.Set;
+import java.util.function.BiConsumer;
+
+public class MetadataDao extends org.leolo.nrdatad.db.MetadataDao {
+
+    private HashMap<String, String> dataMap = new HashMap<>();
+
+    public MetadataDao(DatabaseManager manager) {
+        super(manager);
+    }
+
+    @Override
+    public String getMetadata(String key, String defaultValue) throws SQLException {
+        if(dataMap.containsKey(key))
+            return dataMap.get(key);
+        return defaultValue;
+    }
+
+    @Override
+    public void updateMetadata(String key, @NotNull String value) throws SQLException {
+        dataMap.put(key, value);
+    }
+
+    @Override
+    public Set<String> getKeys() throws SQLException {
+        return dataMap.keySet();
+    }
+
+    @Override
+    public void forEach(BiConsumer<String, String> action) throws SQLException {
+        dataMap.forEach(action);
+    }
+}