release: v3.1.2 - Production Hardening and Monitoring

- Implemented unified error handling with Result pattern.
- Added SQLAlchemy connection pooling for episodic storage.
- Integrated comprehensive health check endpoints.
- Hardened input sanitization for memory events.
- Updated documentation and version to 3.1.2.

Author: sl4m3

docs/changelogs/index.md

@@ -4,6 +4,19 @@ All notable changes to the LedgerMind project since version 2.0.0.
 
 ---
 
+## [v3.1.2] - 2026-03-01
+
+- **Unified Error Handling:** Implemented `Result` pattern with explicit error
+  codes across core components ([#62](https://github.com/sl4m3/ledgermind/pull/62)
+  by @sl4m3).
+- **Health Check System:** Detailed monitoring endpoints for databases, Git, and
+  system health ([#60](https://github.com/sl4m3/ledgermind/pull/60) by @sl4m3).
+- **Connection Pooling:** Added SQLAlchemy `QueuePool` to `EpisodicStore` for
+  better concurrency ([#65](https://github.com/sl4m3/ledgermind/pull/65) by
+  @sl4m3).
+- **Input Sanitization:** Multi-layer protection against XSS and Unicode attacks
+  ([#68](https://github.com/sl4m3/ledgermind/pull/68) by @sl4m3).
+
 ## [v3.1.1] - 2026-03-01
 
 - **Critical Security:** Fixed SQL Injection, Path Traversal, and Race Conditions.

docs/changelogs/latest.md

@@ -1,15 +1,19 @@
-# Latest Release: v3.1.1
+# Latest Release: v3.1.2
 
 ## March 1, 2026
 
-LedgerMind v3.1.1 is a critical security and stability release addressing 
-high-severity vulnerabilities and restoring peak search performance.
+LedgerMind v3.1.2 focus on production-grade reliability, security hardening,
+and comprehensive system monitoring.
 
 ### Highlights
 
-- **Hardened Security:** Fixed SQL Injection, Path Traversal, and Race Conditions.
-- **Performance Restoration:** Speed boosted to **690+ ops/s** via path caching.
-- **Improved Concurrency:** Resolved SQLite "database is locked" errors.
-- **New CI Pipeline:** Automated security scanning (Bandit, Safety) in CI.
+- **Unified Error Handling:** Standardized `Result` pattern for core operations
+  with explicit error codes.
+- **Health Monitoring:** New `/health` endpoints for real-time status of all
+  system components.
+- **Connection Pooling:** High-performance SQLAlchemy `QueuePool` for episodic
+  storage.
+- **Hardened Security:** Multi-layer input sanitization against XSS and Unicode
+  attacks.
 
-[View full v3.1.1 changelog](./v3.1.1.md)
+[View full v3.1.2 changelog](./v3.1.2.md)

docs/changelogs/v3.1.2.md

@@ -0,0 +1,38 @@
+# Changelog v3.1.2 (March 1, 2026)
+
+LedgerMind v3.1.2 focus on production-grade reliability and security
+hardening. This release introduces a standardized error handling pattern,
+high-performance connection pooling for episodic storage, and comprehensive
+monitoring capabilities.
+
+## Highlights
+
+### 🛡️ Production Hardening
+- **Unified Error Handling:** Introduced the `Result` pattern across core
+  components, providing explicit success/failure states and standardized error
+  codes for better predictability.
+- **Input Sanitization:** Implemented multi-layer sanitization for all incoming
+  memory events, including XSS protection, Unicode attack prevention, and
+  content size enforcement.
+
+### ⚡ Performance & Stability
+- **SQLAlchemy Connection Pooling:** Migrated `EpisodicStore` to use SQLAlchemy's
+  `QueuePool`. This significantly reduces connection overhead and file
+  descriptor usage under high concurrent loads.
+- **Memory Performance:** Maintained peak hybrid search performance (~600 ops/s)
+  while adding security and validation layers.
+
+### 📊 Monitoring & Health
+- **Health Check System:** Added detailed health monitoring endpoints
+  (`/health`, `/health/ready`, `/health/live`) providing real-time status of
+  databases, Git repositories, vector indices, and system resources.
+- **Android/Termux Support:** Hardened system resource monitoring to gracefully
+  handle permission restrictions in mobile environments.
+
+## What's Changed
+- feat(server): implement comprehensive health check endpoints by @sl4m3 in [#60](https://github.com/sl4m3/ledgermind/pull/60)
+- feat(core): implement unified error handling with Result pattern by @sl4m3 in [#62](https://github.com/sl4m3/ledgermind/pull/62)
+- perf: add SQLAlchemy connection pooling to EpisodicStore by @sl4m3 in [#65](https://github.com/sl4m3/ledgermind/pull/65)
+- security: add comprehensive input sanitization for memory events by @sl4m3 in [#68](https://github.com/sl4m3/ledgermind/pull/68)
+
+**Full Changelog:** https://github.com/sl4m3/ledgermind/compare/v3.1.1...v3.1.2