Maintain "cleanup" Section of pialert.py

Add Config Parameters
No defaults set if they are missing. Will follow soon.

config/pialert.conf

@@ -7,6 +7,8 @@
 #  Puche 2021        pi.alert.application@gmail.com        GNU GPLv3
 #-------------------------------------------------------------------------------
 
+# General Settings
+# ----------------------
 PIALERT_PATH      = '/home/pi/pialert'
 DB_PATH           = PIALERT_PATH + '/db/pialert.db'
 LOG_PATH          = PIALERT_PATH + '/log'
@@ -16,6 +18,8 @@ TIMEZONE          = 'Europe/Berlin'
 PIALERT_WEB_PROTECTION = False
 PIALERT_WEB_PASSWORD = '8d969eef6ecad3c29a3a629280e686cf0c3f5d5a86aff3ca12020c923adc6c92'
 
+# Mail-Account Settings
+# ----------------------
 SMTP_SERVER       = 'smtp.gmail.com'
 SMTP_PORT         = 587
 SMTP_USER         = 'user@gmail.com'
@@ -23,18 +27,26 @@ SMTP_PASS         = 'password'
 SMTP_SKIP_TLS	  = False
 SMTP_SKIP_LOGIN	  = False
 
+# Mail Reporting
+# ----------------------
 REPORT_MAIL       = False
 REPORT_FROM       = 'Pi.Alert <' + SMTP_USER +'>'
 REPORT_TO         = 'user@gmail.com'
 REPORT_DEVICE_URL = 'http://pi.alert/deviceDetails.php?mac='
 REPORT_DASHBOARD_URL = 'http://pi.alert/'
 
+# Pushsafer
+# ----------------------
 REPORT_PUSHSAFER  = False
 PUSHSAFER_TOKEN   = 'ApiKey'
 
+# ntfy
+# ----------------------
 REPORT_NTFY       = False
 NTFY_TOPIC        = 'replace_my_secure_topicname_91h889f28'
 
+# DynDNS
+# ----------------------
 # QUERY_MYIP_SERVER = 'https://diagnostic.opendns.com/myip'
 QUERY_MYIP_SERVER = 'http://ipv4.icanhazip.com'
 DDNS_ACTIVE       = False
@@ -43,8 +55,15 @@ DDNS_USER         = 'dynu_user'
 DDNS_PASSWORD     = 'A0000000B0000000C0000000D0000000'
 DDNS_UPDATE_URL   = 'https://api.dynu.com/nic/update?'
 
+# Pi-hole Configuration
+# ----------------------
 PIHOLE_ACTIVE     = False
 PIHOLE_DB         = '/etc/pihole/pihole-FTL.db'
 DHCP_ACTIVE       = False
 DHCP_LEASES       = '/etc/pihole/dhcp.leases'
 
+# Maintenance Tasks Cron
+# ----------------------
+DAYS_TO_KEEP_ONLINEHISTORY = 30
+DAYS_TO_KEEP_EVENTS = 90
+