repaired seen_tweets, this time 4 real

db.py

@@ -109,7 +109,7 @@ class DB(object):
             CREATE TABLE IF NOT EXISTS seen_tweets (
                 id          INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
                 user_id     INTEGER,
-                tweet_id    TEXT,
+                tweet_id    INTEGER,
                 FOREIGN KEY(user_id) REFERENCES user(id)
             );
             CREATE TABLE IF NOT EXISTS seen_dms (