NoSQL Document Schema Designer

Design a NoSQL document schema for this application:

**Application:** {{APPLICATION_DESCRIPTION}}
**Main Entities:** {{MAIN_ENTITIES}}
**Access Patterns:** {{ACCESS_PATTERNS}}
**Relationships:** {{RELATIONSHIPS}}
**Database:** {{NOSQL_DATABASE}}

Please provide:
1. Document schema designs for each collection
2. Embedding vs. referencing decisions with rationale
3. Index recommendations
4. Sample documents with realistic data
5. Query examples for common operations
6. Schema validation rules
7. Sharding key recommendations if applicable
8. Data growth and scaling considerations