rinafcode · Xhristin3 · Apr 26, 2026 · Apr 26, 2026
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -0,0 +1,33 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Initial project structure for TeachLink.
+- Soroban smart contracts for rewards, escrow, and tokenization.
+- NestJS indexer for real-time blockchain event tracking.
+- Machine learning-based recommendation system.
+- Comprehensive developer experience toolkit and scripts.
+- Observability and monitoring infrastructure (Prometheus, Grafana).
+- Cross-chain bridge with BFT consensus mechanism.
+- SYSTEM_OVERVIEW.md for high-level project documentation.
+
+### Changed
+- Refined contract module map for better scalability.
+- Updated README with detailed onboarding and troubleshooting steps.
+
+### Fixed
+- Resolved Windows-specific linker issues in test suite.
+- Fixed race conditions in indexer event processing.
+
+---
+
+## [0.1.0] - 2026-04-25
+
+### Added
+- Project initialization and base contract implementation.
diff --git a/README.md b/README.md
@@ -23,6 +23,7 @@ TeachLink is a Soroban smart contract that powers tokenized learning rewards on
 - Architecture
 - Development Workflow
 - Contribution Guidelines
+- Changelog
 - Troubleshooting
 - License
 
@@ -281,7 +282,7 @@ See:
 
 ## Architecture
 
-For full architecture documentation including system diagrams, data flow diagrams, and component interaction maps, see [docs/ARCHITECTURE.md](docs/ARCHITECTURE.md).
+For full architecture documentation including system diagrams, data flow diagrams, and component interaction maps, see [docs/ARCHITECTURE.md](docs/ARCHITECTURE.md). For a high-level overview of the entire ecosystem, see [SYSTEM_OVERVIEW.md](SYSTEM_OVERVIEW.md).
 
 **High-level overview:**
 
@@ -442,6 +443,10 @@ On Windows, `cargo test` may fail with **`link.exe` not found** (MSVC) or **`exp
 - **Run full tests:** Install [Visual Studio Build Tools](https://visualstudio.microsoft.com/visual-cpp-build-tools/) with "Desktop development with C++", then use the default (MSVC) toolchain and run `cargo test -p teachlink-contract`.
 - **Otherwise:** Rely on CI (GitHub Actions) for `cargo test`; the WASM build is what gets deployed.
 
+## Changelog
+
+For a detailed history of changes to this project, see [CHANGELOG.md](CHANGELOG.md).
+
 ## License
 
 This project is licensed under the MIT License. See `LICENSE` for details.
diff --git a/SYSTEM_OVERVIEW.md b/SYSTEM_OVERVIEW.md
@@ -0,0 +1,110 @@
+# TeachLink System Overview
+
+Welcome to the **TeachLink** ecosystem—a decentralized knowledge-sharing platform powered by the Stellar network. This document provides a high-level overview of the entire system architecture, integrating blockchain smart contracts, real-time data indexing, and machine learning-driven recommendations.
+
+---
+
+## 🏗️ The Three Pillars
+
+The TeachLink platform is built on three foundational pillars that work in harmony to deliver a seamless decentralized learning experience.
+
+### 1. Blockchain Core (Soroban Smart Contracts)
+The heart of TeachLink resides on the Stellar network. Our smart contracts, written in Rust for the Soroban platform, handle all critical business logic with transparency and security.
+- **Key Features:** Cross-chain bridging, BFT consensus, multi-sig escrow, content tokenization (NFTs), and decentralized reputation scoring.
+- **Location:** `contracts/`
+- **Documentation:** [Architecture Details](docs/ARCHITECTURE.md) | [API Reference](docs/API_REFERENCE.md)
+
+### 2. Data Availability Layer (Indexer Runtime)
+To provide a fast and responsive user experience, TeachLink employs a high-performance indexer that monitors the Stellar blockchain in real-time.
+- **Tech Stack:** TypeScript, NestJS, PostgreSQL, Prometheus.
+- **Key Features:** Event processing, historical data archival, and a robust REST API for client applications.
+- **Location:** `indexer/`
+- **Documentation:** [Indexer Implementation](indexer/IMPLEMENTATION.md) | [Monitoring Guide](indexer/MONITORING.md)
+
+### 3. Intelligence Layer (Recommendation System)
+TeachLink leverages machine learning to personalize the learning journey for every user, ensuring high engagement and effective knowledge transfer.
+- **Tech Stack:** Python, TensorFlow/PyTorch, Scikit-learn.
+- **Key Features:** Content discovery, personalized learning paths, and predictive reputation modeling.
+- **Location:** `recommendation-system/`
+- **Documentation:** [ML Architecture](recommendation-system/ARCHITECTURE.md) | [Implementation Guide](recommendation-system/IMPLEMENTATION_GUIDE.md)
+
+---
+
+## 🗺️ Global System Map
+
+The following diagram illustrates how the three pillars interact to form the complete TeachLink ecosystem.
+
+```mermaid
+graph TD
+    subgraph Users["User Interfaces"]
+        UI[Web/Mobile Apps]
+    end
+
+    subgraph Intelligence["Intelligence Layer"]
+        RS[Recommendation System]
+        ML[ML Models]
+        RS --- ML
+    end
+
+    subgraph Data["Data Layer"]
+        IDX[Indexer Runtime]
+        DB[(PostgreSQL)]
+        PROM[Prometheus/Grafana]
+        IDX --- DB
+        IDX --- PROM
+    end
+
+    subgraph Chain["Blockchain Layer (Stellar)"]
+        SC[TeachLink Smart Contracts]
+        LEDGER[Stellar Ledger]
+        SC --- LEDGER
+    end
+
+    UI <-->|"API Requests"| IDX
+    UI <-->|"Contract Calls"| SC
+    IDX <--"Syncs events"--> SC
+    RS <--"Consumes data"--> DB
+    UI <--"Personalization"--> RS
+
+    style Chain fill:#e1f5fe,stroke:#01579b
+    style Data fill:#f3e5f5,stroke:#4a148c
+    style Intelligence fill:#e8f5e9,stroke:#1b5e20
+    style Users fill:#fff3e0,stroke:#e65100
+```
+
+---
+
+## 🛠️ Technology Stack
+
+| Layer | Technologies |
+| :--- | :--- |
+| **Smart Contracts** | Rust, Soroban SDK, Stellar CLI |
+| **Indexer/Backend** | TypeScript, NestJS, TypeORM, PostgreSQL |
+| **Machine Learning** | Python, Pandas, NumPy, Scikit-learn |
+| **DevOps** | Docker, GitHub Actions, Prometheus, Grafana |
+| **Testing** | Cargo Test, Jest, Property-based Testing |
+
+---
+
+## 🚀 Getting Started
+
+If you are a developer looking to contribute or deploy the system, follow these links:
+
+1.  **Environment Setup:** See the [Onboarding section in README](README.md#onboarding).
+2.  **Contract Development:** Explore the [Developer Experience Toolkit](DEVELOPER_EXPERIENCE.md).
+3.  **Indexing & Monitoring:** Check the [Observability Guide](OBSERVABILITY.md).
+4.  **Contribution:** Read our [Contributing Guidelines](CONTRIBUTING.md).
+
+---
+
+## 📜 Repository Health & Safety
+
+- **Security:** Our security protocols are documented in [SECURITY.md](SECURITY.md).
+- **Incident Response:** See [INCIDENT_RESPONSE.md](INCIDENT_RESPONSE.md) for emergency procedures.
+- **Testing:** We maintain high standards with our [Testing Platform](TESTING_PLATFORM.md).
+
+---
+
+<div align="center">
+  <p>Built with ❤️ by the TeachLink Team</p>
+</div>