add CustomDomain.auto_create_regex column

app/models.py

@@ -1811,6 +1811,9 @@ class CustomDomain(db.Model, ModelMixin):
     # an alias is created automatically the first time it receives an email
     catch_all = db.Column(db.Boolean, nullable=False, default=False, server_default="0")
 
+    # an alias is auto created if it matches the regex
+    auto_create_regex = db.Column(db.String(512), nullable=True)
+
     # option to generate random prefix version automatically
     random_prefix_generation = db.Column(
         db.Boolean, nullable=False, default=False, server_default="0"

migrations/versions/2021_091716_d8c55e79da54_.py

@@ -0,0 +1,29 @@
+"""empty message
+
+Revision ID: d8c55e79da54
+Revises: 4d3f91ddf3e9
+Create Date: 2021-09-17 16:30:23.299011
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'd8c55e79da54'
+down_revision = '4d3f91ddf3e9'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('custom_domain', sa.Column('auto_create_regex', sa.String(length=512), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('custom_domain', 'auto_create_regex')
+    # ### end Alembic commands ###