Drop send_letters permissions for existing users

migrations/versions/0392_drop_letter_permissions_.py

@@ -0,0 +1,21 @@
+"""
+
+Revision ID: 0392_drop_letter_permissions
+Revises: 0391_update_sms_numbers
+Create Date: 2023-03-06 08:55:24.153687
+
+"""
+from alembic import op
+
+
+revision = '0392_drop_letter_permissions'
+down_revision = '0391_update_sms_numbers'
+
+
+def upgrade():
+    op.execute("DELETE FROM permissions WHERE permission = 'send_letters'")
+
+
+def downgrade():
+    # not able to put the permissions back, but we can just pretend it worked fine.
+    pass