Add history graph to Devices and presence (in development)

- A change in the database is necessary
- change scan-script (pialert.py) was changed to write more data into the database
- update Chart.js to 2.9.4

back/pialert.py

@@ -697,6 +697,17 @@ def print_scan_stats ():
                     (cycle,))
     print ('        IP Changes.........: ' + str ( sql.fetchone()[0]) )
 
+    # Add to History
+    sql.execute("SELECT * FROM Devices")
+    History_All = sql.fetchall()
+    History_All_Devices  = len(History_All)
+    sql.execute("SELECT * FROM CurrentScan")
+    History_Online = sql.fetchall()
+    History_Online_Devices  = len(History_Online)
+    History_Offline_Devices = History_All_Devices - History_Online_Devices
+    sql.execute ("INSERT INTO Online_History (Scan_Date, Online_Devices, Down_Devices, All_Devices) "+
+                 "VALUES ( ?, ?, ?, ?)", (startTime, History_Online_Devices, History_Offline_Devices, History_All_Devices ) )
+
 #-------------------------------------------------------------------------------
 def create_new_devices ():
     # arpscan - Insert events for new devices
@@ -940,7 +951,7 @@ def update_devices_data_from_scan ():
 
     # New Apple devices -> Cycle 15
     print_log ('Update devices - 6 Cycle for Apple devices')
-    sql.execute ("""UPDATE Devices SET dev_ScanCycle = 1
+    sql.execute ("""UPDATE Devices SET dev_ScanCycle = 15
                     WHERE dev_FirstConnection = ?
                       AND UPPER(dev_Vendor) LIKE '%APPLE%' """,
                 (startTime,) )