Drop original_url column from Topic

This isn't being used for anything, might as well get rid of the cruft.

tildes/alembic/versions/8326f8cc5ddd_topic_drop_original_url_column.py

@@ -0,0 +1,24 @@
+"""Topic: drop original_url column
+
+Revision ID: 8326f8cc5ddd
+Revises: 20b5f07e5f80
+Create Date: 2019-10-05 00:52:20.515858
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "8326f8cc5ddd"
+down_revision = "20b5f07e5f80"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.drop_column("topics", "original_url")
+
+
+def downgrade():
+    op.add_column("topics", sa.Column("original_url", sa.Text(), nullable=True))

tildes/scripts/clean_private_data.py

@@ -145,7 +145,6 @@ class DataCleaner:
                     "markdown": DEFAULT,
                     "rendered_html": DEFAULT,
                     "link": DEFAULT,
-                    "original_url": DEFAULT,
                     "content_metadata": DEFAULT,
                     "_tags": DEFAULT,
                 },

tildes/tildes/models/topic/topic.py

@@ -116,7 +116,6 @@ class Topic(DatabaseModel):
     _markdown: Optional[str] = deferred(Column("markdown", Text))
     rendered_html: Optional[str] = Column(Text)
     link: Optional[str] = Column(Text)
-    original_url: Optional[str] = Column(Text)
     content_metadata: Dict[str, Any] = Column(
         MutableDict.as_mutable(JSONB(none_as_null=True))
     )
@@ -229,7 +228,6 @@ class Topic(DatabaseModel):
         new_topic = cls._create_base_topic(group, author, title)
         new_topic.topic_type = TopicType.LINK
         new_topic.link = link
-        new_topic.original_url = link
 
         incr_counter("topics", type="link")