v0.21.2 Wipe URL table for now

gossamer_forums.rb

@@ -1,5 +1,5 @@
 # gossamer threads migration-import code
-# v0.21.1
+# v0.21.2
 
 require 'mysql2'
 require 'open-uri'
@@ -59,9 +59,12 @@ class GossamerForumsImporter < ImportScripts::Base
         real_name TEXT
       );
     SQL
-#    @db.execute <<-SQL
-#      DROP TABLE IF EXISTS url_map;
-#    SQL
+
+    # ONLY when we need to clear the url_map e.g. if reimporting topics-posts from scratch
+    @db.execute <<-SQL
+      DROP TABLE IF EXISTS url_map;
+    SQL
+
     @db.execute <<-SQL
       CREATE TABLE IF NOT EXISTS url_map (
         old_post_id INTEGER PRIMARY KEY,