DeepSeek JavaScript Algorithm: data validation pipeline for fitness tracker

Implement a data validation pipeline algorithm in JavaScript for use in a fitness tracker.

**Leverage DeepSeek strengths:** This requires deep algorithmic reasoning, optimization analysis, and production-quality code generation, which are your core strengths.

**Tech stack context:** Remix + Prisma

## Implementation Requirements

### Problem Definition
- Clearly define the problem this algorithm solves within a fitness tracker
- Specify the input format, constraints, and expected output
- Define performance requirements (time complexity target, space constraints)
- Describe the real-world use case and why this algorithm is the right choice

### Algorithm Design
- Explain the algorithmic approach step by step before writing code
- Discuss why this approach was chosen over alternatives
- Analyze time complexity: best, average, and worst case with Big-O notation
- Analyze space complexity and memory usage patterns
- Identify edge cases and boundary conditions

### Core Implementation
Provide the complete, production-ready implementation in JavaScript:
- Clean, well-structured code following JavaScript idioms and conventions
- Comprehensive type annotations and interfaces
- Inline comments explaining non-obvious logic
- Error handling for invalid inputs and edge cases
- Configurable parameters with sensible defaults

### Optimizations
- Identify and implement at least 2 performance optimizations
- Explain the trade-offs of each optimization (readability vs. speed, memory vs. time)
- Include benchmarking code to measure performance
- Suggest when the optimization is worthwhile vs. premature

### Testing Suite
Provide a complete test suite including:
- Unit tests for the core algorithm logic
- Edge case tests (empty input, single element, maximum size, duplicates)
- Performance tests with large inputs
- Property-based test suggestions
- Test data generators for stress testing

### Usage Examples
- 3 real-world usage examples within a fitness tracker context
- Integration pattern showing how to connect this to a larger system
- Configuration guide for tuning performance parameters

### Documentation
- Clear function and parameter documentation
- Complexity analysis summary table
- Decision guide: when to use this algorithm vs. alternatives
- Common pitfalls and how to avoid them

Write code that is not just correct but exemplary. This should serve as a reference implementation that developers can learn from.