remove unique constraint on user on deleted_alias table

app/models.py

@@ -559,7 +559,7 @@ class Subscription(db.Model, ModelMixin):
 class DeletedAlias(db.Model, ModelMixin):
     """Store all deleted alias to make sure they are NOT reused"""
 
-    user_id = db.Column(
-        db.ForeignKey(User.id, ondelete="cascade"), nullable=False, unique=True
-    )
+    user_id = db.Column(db.ForeignKey(User.id, ondelete="cascade"), nullable=False)
     email = db.Column(db.String(128), unique=True, nullable=False)
+
+

migrations/versions/0a89c670fc7a_.py

@@ -0,0 +1,29 @@
+"""empty message
+
+Revision ID: 0a89c670fc7a
+Revises: d68a2d971b70
+Create Date: 2019-11-18 15:18:23.494405
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '0a89c670fc7a'
+down_revision = 'd68a2d971b70'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint('deleted_alias_user_id_key', 'deleted_alias', type_='unique')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_unique_constraint('deleted_alias_user_id_key', 'deleted_alias', ['user_id'])
+    # ### end Alembic commands ###