Graviton

Theme

Design Documents ​

This section contains detailed design documents for major Graviton features and architectural decisions.

Active Designs ​

Core System ​

Quasar integration ​

Schema & Types ​

  • Schema Evolution — Forward-compatible manifest format (planned)
  • Binary Attributes — Advertised vs confirmed metadata (see Schema & Types)
  • Hashing Strategy — Multi-algorithm support and key derivation (planned)

Storage & Performance ​

  • Hybrid Backend Architecture — PostgreSQL + S3 design (see Backends)
  • Tiered Storage — Hot/warm/cold data management (planned)
  • Deduplication Index — Block-level dedup tracking (planned)
  • Compression Strategy — When and how to compress (planned)

Operations ​

  • Metrics Architecture — Prometheus integration and key metrics (see Constraints & Metrics)
  • Rate Limiting — Token bucket implementation (planned)
  • Authentication Model — JWT, API keys, and signed URLs (planned)
  • Multi-tenancy — Isolation and quota management (planned)

Future Designs ​

Phase 2 (Post v0.1.0) ​

  • Anchored Ingest Pipeline — Format-aware chunking with DFA tokenization
  • Self-Describing Frame Format — Versioned frame encoding
  • CDC Base Blocks — Dedup via rolling hash index
  • Format-Aware Views — PDF/ZIP structural access

Phase 3 (Future) ​

  • Erasure Coding — Alternative to replication
  • Geo-Replication — Cross-region strategies
  • Query Engine — Content search and indexing
  • Streaming Analytics — Real-time metrics on ingest

Design Template ​

Use this template for new designs:

markdown
# Feature Name

## Status

**Status:** Proposed | Draft | Accepted | Implemented  
**Author:** @username  
**Created:** 2025-10-30  
**Updated:** 2025-10-30

## Summary

One-paragraph overview of the feature.

## Motivation

Why do we need this? What problem does it solve?

## Design

### Architecture

Describe the high-level design.

### API

Show interfaces and examples.

### Data Model

Describe any new types or schemas.

### Implementation

Key implementation details.

## Alternatives Considered

What other approaches were considered and why were they rejected?

## Testing Plan

How will this be tested?

## Performance Impact

Expected performance characteristics.

## Migration Path

How do we migrate from the current state?

## Open Questions

What's still TBD?

## References

Links to related designs, issues, or documentation.

Review Process ​

  1. Propose: Create draft in /docs/design/
  2. Discussion: Share in GitHub Discussions or PR
  3. Iterate: Address feedback
  4. Accept: Mark as "Accepted" when consensus reached
  5. Implement: Reference design in implementation PRs
  6. Update: Keep design docs in sync with implementation

Design Principles ​

Modularity ​

  • Pure domain logic separate from effects
  • Backends implement abstract ports
  • Protocols independent of core logic

Type Safety ​

  • Use opaque types for domain primitives
  • Leverage zio-schema for serialization
  • Prefer compile-time over runtime checks

Performance ​

  • Streaming by default
  • Lazy evaluation where appropriate
  • Minimize allocations in hot paths

Observability ​

  • Structured logging with correlation IDs
  • Prometheus metrics for all operations
  • Tracing for distributed operations

Testability ​

  • Pure functions where possible
  • Dependency injection via ZLayer
  • Property-based testing for algorithms

See Also ​

TIP

When in doubt, write a design doc before implementing a major feature!

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