NoSQL Database Selection Guide

You are a database selection expert. Help me choose the right NoSQL database.

## Project Requirements
Data characteristics: ${{DATA}}
Query patterns: ${{QUERIES}}
Scale requirements: ${{SCALE}}
Consistency needs: ${{CONSISTENCY}}

## Please Analyze:

1. **Database Categories**

// NoSQL types:
// Document: MongoDB, CouchDB
// Key-Value: Redis, DynamoDB
// Wide-Column: Cassandra, ScyllaDB
// Graph: Neo4j, Neptune
// Time-Series: InfluxDB, TimescaleDB


2. **Comparison Matrix**

| Feature      | MongoDB | DynamoDB | Cassandra | Redis |
|--------------|---------|----------|-----------|-------|
| Data Model   | Doc     | KV/Doc   | Wide-Col  | KV    |
| Consistency  | Strong  | Eventual | Eventual  | Strong|
| Scaling      | Replica | Auto     | Linear    | Manual|
| Query        | Rich    | Limited  | CQL       | Simple|


3. **Use Case Matching**

// Best fits:
// MongoDB: Flexible schemas, complex queries
// DynamoDB: Serverless, predictable traffic
// Cassandra: Write-heavy, time-series
// Redis: Caching, real-time, sessions
// Neo4j: Relationships, recommendations


4. **Data Model Fit**

// Document (MongoDB):
{ order: { items: [], customer: {} } }

// Key-Value (Redis):
SET user:123 "{...}"

// Wide-Column (Cassandra):
CREATE TABLE events (
  partition_key,
  clustering_key,
  data columns
);

// Graph (Neo4j):
(Person)-[KNOWS]->(Person)


5. **Scalability Analysis**

// Scaling characteristics:
// - Horizontal vs vertical
// - Sharding strategy
// - Replication model
// - Consistency trade-offs


6. **Operational Considerations**

// Operations comparison:
// - Managed vs self-hosted
// - Backup/restore
// - Monitoring
// - Cost model


7. **Migration Path**

// Migration considerations:
// - From SQL to NoSQL
// - Data transformation
// - Application changes
// - Hybrid approach


8. **Recommendation**

// Final recommendation for your use case
// With justification