Add Alias.original_owner_id column

app/models.py

@@ -995,6 +995,11 @@ class Alias(db.Model, ModelMixin):
         default=None,
     )
 
+    # set in case of alias transfer.
+    original_owner_id = db.Column(
+        db.ForeignKey(User.id, ondelete="SET NULL"), nullable=True
+    )
+
     # alias is pinned on top
     pinned = db.Column(db.Boolean, nullable=False, default=False, server_default="0")
 

migrations/versions/2021_021712_de7aa5280210_.py

@@ -0,0 +1,31 @@
+"""empty message
+
+Revision ID: de7aa5280210
+Revises: 85d0655d42c0
+Create Date: 2021-02-17 12:43:51.154170
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'de7aa5280210'
+down_revision = '85d0655d42c0'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('alias', sa.Column('original_owner_id', sa.Integer(), nullable=True))
+    op.create_foreign_key(None, 'alias', 'users', ['original_owner_id'], ['id'], ondelete='SET NULL')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(None, 'alias', type_='foreignkey')
+    op.drop_column('alias', 'original_owner_id')
+    # ### end Alembic commands ###