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Hi, I have a few questions regarding nova development

Hi, I have a few questions regarding nova development, and I would appreciate any help I could get regarding this: 1. Do we have any existing migration scripts for generating new columns or do we write custom scripts using sqlalchemy migrate? 2. To make the instance object aware of the schema version; doesn't the nova-manage db sync handle this, if not, which api's would we need to update or modify? 3. metadata is acquired from various sources, but to get the specific 'system_metadata' which class do we need to use? 4. To convert the metadata information to a json blob, do we have any existing generic module or do we need to write a separate module for this?