Password changed at is defaulted to the current date when the user is created.

This PR set the users.password_changed_at column to not be nullable.

migrations/versions/0034_pwd_changed_at_not_null.py

@@ -0,0 +1,28 @@
+"""empty message
+
+Revision ID: 0034_pwd_changed_at_not_null
+Revises: 0033_api_key_type
+Create Date: 2016-06-28 10:37:25.389020
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '0034_pwd_changed_at_not_null'
+down_revision = '0033_api_key_type'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    op.get_bind()
+    op.execute('update users set password_changed_at = created_at where password_changed_at is null')
+    op.alter_column('users', 'password_changed_at', nullable=False)
+    ### end Alembic commands ###
+
+
+def downgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    pass
+    ### end Alembic commands ###