add EmailChange model

app/models.py

@@ -224,6 +224,10 @@ def _expiration_1h():
     return arrow.now().shift(hours=1)
 
 
+def _expiration_12h():
+    return arrow.now().shift(hours=12)
+
+
 def _expiration_5m():
     return arrow.now().shift(minutes=5)
 
@@ -563,3 +567,20 @@ class DeletedAlias(db.Model, ModelMixin):
     email = db.Column(db.String(128), unique=True, nullable=False)
 
 
+class EmailChange(db.Model, ModelMixin):
+    """Used when user wants to update their email"""
+
+    user_id = db.Column(
+        db.ForeignKey(User.id, ondelete="cascade"),
+        nullable=False,
+        unique=True,
+        index=True,
+    )
+    new_email = db.Column(db.String(128), unique=True, nullable=False)
+    code = db.Column(db.String(128), unique=True, nullable=False)
+    expired = db.Column(ArrowType, nullable=False, default=_expiration_12h)
+
+    user = db.relationship(User)
+
+    def is_expired(self):
+        return self.expired < arrow.now()

migrations/versions/3ebfbaeb76c0_.py

@@ -0,0 +1,43 @@
+"""empty message
+
+Revision ID: 3ebfbaeb76c0
+Revises: 0a89c670fc7a
+Create Date: 2019-11-18 19:29:43.277973
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '3ebfbaeb76c0'
+down_revision = '0a89c670fc7a'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('email_change',
+    sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
+    sa.Column('created_at', sqlalchemy_utils.types.arrow.ArrowType(), nullable=False),
+    sa.Column('updated_at', sqlalchemy_utils.types.arrow.ArrowType(), nullable=True),
+    sa.Column('user_id', sa.Integer(), nullable=False),
+    sa.Column('new_email', sa.String(length=128), nullable=False),
+    sa.Column('code', sa.String(length=128), nullable=False),
+    sa.Column('expired', sqlalchemy_utils.types.arrow.ArrowType(), nullable=False),
+    sa.ForeignKeyConstraint(['user_id'], ['users.id'], ondelete='cascade'),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('code'),
+    sa.UniqueConstraint('new_email')
+    )
+    op.create_index(op.f('ix_email_change_user_id'), 'email_change', ['user_id'], unique=True)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_email_change_user_id'), table_name='email_change')
+    op.drop_table('email_change')
+    # ### end Alembic commands ###