## ADDED Requirements

### Requirement: Provide comprehensive DuckDB merge strategy guidance

Users SHALL have access to comprehensive documentation explaining when and how to use each DuckDB merge strategy.

#### Scenario: DuckDB strategy selection guidance
- **WHEN** a user needs to perform merge operations with DuckDB
- **THEN** documentation SHALL provide clear guidance on selecting appropriate merge strategy
- **AND** SHALL include real-world use cases for each strategy
- **AND** SHALL explain DuckDB-specific behavior of each strategy with existing and new data

#### Scenario: DuckDB vs PyArrow backend selection
- **WHEN** a user chooses between DuckDB and PyArrow for merge operations
- **THEN** documentation SHALL provide guidance on backend selection
- **AND** SHALL include performance characteristics
- **AND** SHALL document feature differences
- **AND** SHALL recommend use cases for each backend

### Requirement: Ensure DuckDB merge functionality discoverability

DuckDB merge-aware write functionality SHALL be easily discoverable through documentation structure.

#### Scenario: DuckDB merge documentation navigation
- **WHEN** a user browses dataset documentation
- **THEN** DuckDB merge-aware write functionality SHALL be prominently featured
- **AND** SHALL be accessible from multiple entry points (API docs, how-to guides, examples)
- **AND** SHALL be cross-referenced with PyArrow merge functionality
- **AND** existing comprehensive examples SHALL be integrated into documentation flow