diff --git a/lib/db.py b/lib/db.py
index 50252c7..dcf20cf 100644
--- a/lib/db.py
+++ b/lib/db.py
@@ -3,7 +3,7 @@ import mmh3
 import sys
 #import requests
 import httplib2
-DEBUG = False
+DEBUG = True
 
 def log(*s):
     if DEBUG:
@@ -67,13 +67,13 @@ def createnwview(file):
         createFilterTable(file)
 
 def createFilterTable(file):
-    with sqlite3.connect(file) as connection:
+    with sqlite3.connect(file,timeout=10) as connection:
         cmd_create_filter_table = f"""CREATE TABLE IF NOT EXISTS filters(cmd TEXT);"""
         cursor = connection.cursor()
         cursor.execute(cmd_create_filter_table)
         print("db connection:",connection.total_changes)
 def addFineFilter(file,table,filterstr):
-    with sqlite3.connect(file) as connection:
+    with sqlite3.connect(file,timeout=10) as connection:
         cmd_createFineFilter = f"""INSERT INTO {table}(cmd) VALUES(?);"""
         cmd_checkIfExists = f"""SELECT * FROM {table} WHERE cmd = ?"""
         cursor = connection.cursor()
@@ -81,7 +81,8 @@ def addFineFilter(file,table,filterstr):
             cursor.execute(cmd_createFineFilter,(filterstr,))
 
 def writedb(jobs):
-        with sqlite3.connect("../db/sqlite3.db") as connection:
+        with sqlite3.connect("../db/sqlite3.db",timeout=10) as connection:
+            connection.execute("pragma journal_mode=wal")
             print("db connection", connection.total_changes)
             cursor = connection.cursor()
         #    cursor.execute("CREATE TABLE jobs (title TEXT, location TEXT, company TEXT,link TEXT,hash INT)")
@@ -94,16 +95,19 @@ def writedb(jobs):
                     print("NEW_ENTRY")
                     cursor.execute("INSERT INTO jobs (star,tag,title,company,location,link,pubdate,hash) VALUES (?,?,?,?,?,?,?,?)",(job.starred,job.tag,job.title,job.company,job.location,job.link,job.date,hash1))
 
-def isStillValid(file):
+def isStillValid(file,skiprows):
     rows = [0,0,0]
-    with sqlite3.connect(file) as connection:
+    with sqlite3.connect(file,timeout=10) as connection:
         cmd_read_chunk = f"""SELECT link from jobs;"""
+        connection.execute("pragma journal_mode=wal")
         cursor = connection.cursor()
         cursor.execute(cmd_read_chunk)
         
+        #cursor.fetchmany(skiprows)#drop rows
         while(len(rows)!=0):
             isLink = True
             rows = []
+
             rows = cursor.fetchmany(256)
             h = httplib2.Http()
             for row in rows:
@@ -135,3 +139,5 @@ def isStillValid(file):
                                 rm_itm = rm_cursor.execute(f"""DELETE from jobs WHERE link = ?;""",(row[0],))
                                 print ("Deletion resultet in: ", rm_itm)
             print("result of commit: ", connection.commit())
+            return 0
+
diff --git a/lib/gui.py b/lib/gui.py
index a04149f..32d50bc 100644
--- a/lib/gui.py
+++ b/lib/gui.py
@@ -2,14 +2,31 @@ from PySide6.QtWidgets import QApplication, QWidget, QMainWindow, QTableWidget,
 from PySide6.QtWebEngineWidgets import QWebEngineView
 from PySide6.QtCore import QUrl,Qt,QSortFilterProxyModel, qDebug, QSize,QObject,QThread,Signal
 from PySide6.QtSql import QSqlDatabase, QSqlTableModel, QSqlQueryModel, QSqlQuery
-
+from PySide6 import QtGui
 from db import addFineFilter
 import sysparse
 import sys
+import db as db
+
+DBFILE = "../db/sqlite3.db"
 
 Cantons = ["AG","ZH","BE","SG","SO"]
 
+class TableModel(QAbstractTableModel):
+    def __init__(self, data):
+        super(TableModel, self).__init__()
+        self._data = data
+    def data(self, index, role):
+        if role == Qt.BackgroundRole:
+            return QtGui.QColor('#9C0006')
 
+class ValidationWorker(QObject):
+    finished = Signal()
+
+    def run(self):
+        ret = db.isStillValid(DBFILE,0) 
+        if ret == 0:
+            self.finished.emit()
 class Worker(QObject):
         pwprompt = Signal()
         pw = Signal(str)
@@ -56,6 +73,8 @@ class MainWindow(QMainWindow):
         self.setProxyViewSettings()
         self.view.clicked.connect(self.cell_clicked)
 
+        self.PValidate = QPushButton("links valid")
+        self.PValidate.clicked.connect(self.runValidation)
 
         self.PsyncDB = QPushButton("Perform sync acording to config file")
         self.PsyncDB.clicked.connect(self.runWorker)
@@ -64,6 +83,7 @@ class MainWindow(QMainWindow):
         self.layout.addWidget(self.b_canton)
         self.layout.addWidget(self.EditQuery)
         self.layout.addWidget(self.PsyncDB)
+        self.layout.addWidget(self.PValidate)
         self.layout2.addLayout(self.layout)
         self.layout2.addWidget(self.browser)
 
@@ -90,9 +110,25 @@ class MainWindow(QMainWindow):
         self.worker.pwprompt.connect(self.showDialog)
         self.worker.finished.connect(self.thread.quit)
         self.worker.finished.connect(self.enable_PsyncDB)
-        
-
         self.thread.start()
+    def runValidation(self):
+        self.validationThread = QThread()
+        self.validationWorker = ValidationWorker()
+
+        self.validationWorker.moveToThread(self.validationThread)
+        
+        self.validationThread.started.connect(self.disableValidationButton)
+        self.validationThread.started.connect(self.validationWorker.run)
+        
+        self.validationThread.start()
+        self.validationWorker.finished.connect(self.validationThread.quit)
+        self.validationWorker.finished.connect(self.enableValidationButton)
+    
+    def enableValidationButton(self):
+        self.PValidate.setEnabled(True)
+    def disableValidationButton(self):
+        self.PValidate.setEnabled(False)
+
     def disable_PsyncDB(self):
         self.PsyncDB.setText("Sync Running...")
         self.PsyncDB.setEnabled(False)