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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[1.2.PR-NUM] - 2026-02-26

Fixed

  • NuGet publish pipeline now packs and publishes Sharc.Core together with the Sharc meta package dependency chain.
  • CreateReader(..., SharcFilter[] filters) now uses index planning for sargable legacy filters instead of always forcing a table scan.

Changed

  • NuGet package staging moved to artifacts/nuget (ignored folder) to avoid root-level package artifacts.
  • Release PR policy formalized: PRs to main must include README.md and CHANGELOG.md updates.

[1.0.0-beta.1] - 2026-02-16

Core Engine

  • B-tree reader with zero-copy ReadOnlySpan<byte> page traversal (61x faster seeks vs SQLite)
  • Sequential scans with lazy column decode (4x faster, 568 B allocation for 2,500 rows)
  • Point lookups via Seek() in < 1 microsecond (392 ns)
  • Batch seeks — 6 consecutive seeks in 1,940 ns (66x faster)
  • Page I/O — File, Memory, Memory-mapped, and Cached page sources
  • LRU page cache with configurable capacity (default 2,000 pages)
  • WHERE filtering via SharcFilter and closure-compiled FilterStar predicates
  • Column projection — skip decoding unwanted columns
  • WAL read support — read databases with active WAL files
  • Overflow page assembly using ArrayPool<byte> (zero steady-state allocation)

SQL Query Pipeline

  • Full SQL parser and compiler for SELECT statements
  • WHERE with comparison, LIKE, IN, BETWEEN, IS NULL operators
  • ORDER BY with multi-column sort and streaming TopN heap
  • GROUP BY with COUNT, SUM, AVG, MIN, MAX aggregates (streaming hash aggregator)
  • LIMIT / OFFSET with streaming execution
  • UNION ALL / UNION / INTERSECT / EXCEPT with pooled open-addressing hash maps
  • Cotes (Common Table Expressions) with lazy evaluation
  • Parameterized queries via $param syntax
  • Query plan caching for repeated execution

Write Engine

  • INSERT with B-tree page splits and cell overflow
  • ACID transactions with rollback journal
  • RecordEncoder and CellBuilder for SQLite-compatible record encoding

Encryption (Sharc.Crypto)

  • AES-256-GCM page-level encryption
  • Argon2id key derivation (memory-hard, GPU-resistant)
  • SharcKeyHandle for secure key lifecycle management

Graph Storage (Sharc.Graph)

  • ConceptStore and RelationStore with B-tree backing
  • SeekFirst O(log N) cursor for graph traversal
  • 2-hop BFS in 2.6 us (31x faster than SQLite-based traversal via zero-alloc cursor BFS)
  • Node seek in 1,475 ns (14.5x faster)

Trust Layer

  • AgentRegistry — ECDSA self-attestation for AI agent identity
  • LedgerManager — hash-chain tamper-evident audit log
  • ReputationEngine — trust scoring based on agent behavior
  • Co-signatures — multi-party authorization
  • Governance — configurable trust policies

Infrastructure

  • 2,669 tests across 6 test projects (unit, integration, query, graph, index, context)
  • Live Arena — Blazor WASM benchmark app at revred.github.io/Sharc
  • BenchmarkDotNet suite — Sharc vs SQLite comparisons
  • MCP Context Server — Model Context Protocol integration
  • CI/CD — GitHub Actions (build, test, publish, deploy)
  • SourceLink — debugger support for NuGet packages
  • Central package management via Directory.Packages.props
  • .NET 10.0 target with trimming and AOT compatibility