add import sys to class_sqlThread.py

src/class_sqlThread.py

@@ -3,6 +3,7 @@ import shared
 import sqlite3
 import time
 import shutil  # used for moving the messages.dat file
+import sys
 
 # This thread exists because SQLITE3 is so un-threadsafe that we must
 # submit queries to it and it puts results back in a different queue. They