Revert "Revert "Revert "Use DB to store last-seen data, so it will presist across restarts"""
Revert "Revert "Revert "Use DB to store last-seen data, so it will presist across restarts"""

This reverts commit 09e07581479384cecb286ff5fb4d23ed77e003ae and all commits done after it in seen.py

Uname-a/knife_scraper,Uname-a/knife_scraper,Uname-a/knife_scraper