Fix md5 dedup check, add debug message when a post is being added to the database

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

chanbans/pull.py

@@ -86,7 +86,6 @@ async def pull():
         # Try to create post in database
         try:
             with db:
-
                 # Check the last N bans for the given board. If the following columns are equal:
                 # * now
                 # * time
@@ -102,16 +101,23 @@ async def pull():
                     where
                         now = :now
                     and time = :time
-                    and md5 = :md5
+                    and (md5 = :md5 or md5 is null)
                     and com = :com
                     and sub = :sub
                     and board = :board
                     """,
                     post,
                 )
-                if _row := result.fetchone():
-                    log.debug("duplicate found, skipping - %s", _row["id"])
+                if row := result.fetchone():
+                    log.debug("duplicate found, skipping - %s", row["id"])
                     continue
+                else:
+                    log.debug(
+                        "adding post from %s with creation time %s and ban time %s",
+                        post["board"],
+                        post["time"],
+                        post["now"],
+                    )
 
                 post["action"] = cols["action"]
                 # post['board'] = cols['board']