In the following example we make a user management system where
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1. Each user and group are entities
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2. User is an entity of type 0
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3. Group is an entity of type 1
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4. Each entity (user/group) has 0-1 email
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5. Each entity has 0-* phonenumbers
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6. If an entity is saved all its emails and phonenumbers are also saved
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7. If an entity is deleted all its emails and phonenumbers are also deleted
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8. When an entity is created and saved a current timestamp will be assigned to 'created' field
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9. When an entity is updated a current timestamp will be assigned to 'updated' field
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10. Entities will always be fetched in batches