A repository showing how to handle concurrent conflicts using EntityFramework Core and DDD Aggregates

An implementation of Optimistic Concurrency Control Algorithms - FOCC and BOCC (Forward and Backward), according to the book Transactional Information Systems (Vossen)

A thread-safe in-memory key-value store with optimistic concurrency support.

Entity Framework Core Concurrency Control Demo

Shared versioned state for multi-agent AI workflows. An MCP server.

Live room where humans and NodeAgents edit a shared spreadsheet, note, and post-it wall together — never clobbering each other. lock → draft → smart-merge with per-element CAS versioning. Runs deterministic (no keys, in-memory) or live (Convex + model-routed LLM agents). Verified multi-client sync, no refresh.

A comprehensive full-stack CRUD application showcasing modern client-server architecture with search, sorting, pagination, optimistic concurrency, bulk operations, and real-time statistics built in vanilla JavaScript and Node.js.

A lock-free software-only runtime system for C++ that eliminates concurrency errors for fork-join parallel programs

A .NET 10 demo for exploring optimistic and pessimistic database concurrency patterns with Entity Framework Core, SQL Server, and Minimal APIs.

A PDEVS C++ parallel simulator. supporting multiple synchronization paradigms

Bank API with concurrency check on Bank Balance with ASP.NET Core and Entity Framework Core

A highly scalable RESTful Airline Ticketing API built with .NET 8. Features a custom Ocelot API Gateway, B2B Agency ticketing model, Optimistic Concurrency Control, and full Microsoft Azure cloud deployment.

Collaborative market research reports backend: report sharing, section-level optimistic concurrency (ETag/If-Match), append-only audit log with revert, and LLM-gateway section rewrite. FastAPI + async SQLAlchemy + Alembic + PostgreSQL.

Production-ready collaborative wiki backend with MongoDB, OCC, JWT auth, full-text search, and schema migrations

ASP.NET Core incident management API demonstrating Clean Architecture, domain state transitions, JWT-secured commands, ETags, and optimistic concurrency.

Community library lending backend built with .NET 10, CQRS, MySQL, MongoDB, optimistic concurrency, and a transactional outbox.

E-Tag Example - Shallow

A live play-money market where every World Cup footballer is a tradeable stock — one globally-consistent market on Aurora DSQL, settled exactly-once through the goal-moment write spike. AWS × Vercel H0.

Compile-time optimistic concurrency for EF Core — [Optimistic] generates RowVersion, SaveChangesClientWinsAsync and SaveChangesDatabaseWinsAsync handle conflicts

Optimistic concurrency control in EF Core with PostgreSQL via Npgsql. Companion ASP.NET Core 10 demo for the blog post: base Entity class, SaveChangesInterceptor, load helper, retry wrapper, and HTTP 409 mapping.