Remove treasure rewards for comments.

Given that coins are not visible in many contexts, the conspicuous
appearance of treasure chests (random coin rewards on 1% of comments)
seems out of place. This removes the logic which rewards treasure,
the visible display of treasure, and drops the column containing
treasure information which has already been awarded to at least one
comment on prod.

migrations/versions/2022_09_04_21_49_42_c217c608d86c_remove_treasure_amount_from_comments.py

@@ -0,0 +1,28 @@
+"""Remove treasure_amount from comments.
+
+Revision ID: c217c608d86c
+Revises: c5bbdae9a233
+Create Date: 2022-09-04 21:49:42.471406+00:00
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'c217c608d86c'
+down_revision = 'c5bbdae9a233'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('comments', 'treasure_amount')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('comments', sa.Column('treasure_amount', sa.VARCHAR(length=10), autoincrement=False, nullable=True))
+    # ### end Alembic commands ###