i am trying to create an model event to track amendments..

the table structure uses a sequence field that 0 = current and evey other version has sequence incremented like so

id sequence value
1 0 £100 <-current record
2 3 £90
3 2 £101
4 1 £80

this is simple ish but i hit a an error that the event fires its self so how do i stop that.. or how do i divert the save to a create new and set old row sequance+1...

model event code

    static::updated(function($ledger){
	
		$changed = false;
		//has data changed... but ignore date fields
		foreach($ledger->getDirty() as $attribute => $value){
			if ($attribute != 'created_at' && $attribute != 'updated_at' && $attribute != 'deleted_at'){
				if($ledger->getOriginal($attribute) != $value){
					$changed = true;
					}
				}
			}
		if ($changed == true){
			$sequence = \Ledger::where('number','=',$ledger->number)->max('sequence') + 1;
			echo "sequence '$sequence'<br/>\r\n";
			$history = \Ledger::where('number','=',$ledger->number)
								->where(\DB::raw('DATE(updated_at)'),'=',\DB::raw('DATE(NOW())'))
								->first();
			if (!$history){ //if history dose not exisit for today create it
				$history  = new \Ledger
				}
			$history->sequence = $sequence;
			$history->val = $ledger->val;
			$history->save();
			}
		}