Initial commit: Northern Thailand Ping River Monitor v3.1.0

Features:
- Real-time water level monitoring for Ping River Basin (16 stations)
- Coverage from Chiang Dao to Nakhon Sawan in Northern Thailand
- FastAPI web interface with interactive dashboard and station management
- Multi-database support (SQLite, MySQL, PostgreSQL, InfluxDB, VictoriaMetrics)
- Comprehensive monitoring with health checks and metrics collection
- Docker deployment with Grafana integration
- Production-ready architecture with enterprise-grade observability

 CI/CD & Automation:
- Complete Gitea Actions workflows for CI/CD, security, and releases
- Multi-Python version testing (3.9-3.12)
- Multi-architecture Docker builds (amd64, arm64)
- Daily security scanning and dependency monitoring
- Automated documentation generation
- Performance testing and validation

 Production Ready:
- Type safety with Pydantic models and comprehensive type hints
- Data validation layer with range checking and error handling
- Rate limiting and request tracking for API protection
- Enhanced logging with rotation, colors, and performance metrics
- Station management API for dynamic CRUD operations
- Comprehensive documentation and deployment guides

 Technical Stack:
- Python 3.9+ with FastAPI and Pydantic
- Multi-database architecture with adapter pattern
- Docker containerization with multi-stage builds
- Grafana dashboards for visualization
- Gitea Actions for CI/CD automation
- Enterprise monitoring and alerting

 Ready for deployment to B4L infrastructure!

src/exceptions.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+"""
+Custom exceptions for water monitoring system
+"""
+
+class WaterMonitorException(Exception):
+    """Base exception for water monitoring system"""
+    pass
+
+class DatabaseConnectionError(WaterMonitorException):
+    """Raised when database connection fails"""
+    pass
+
+class APIConnectionError(WaterMonitorException):
+    """Raised when API connection fails"""
+    pass
+
+class DataValidationError(WaterMonitorException):
+    """Raised when data validation fails"""
+    pass
+
+class ConfigurationError(WaterMonitorException):
+    """Raised when configuration is invalid"""
+    pass
+
+class DataParsingError(WaterMonitorException):
+    """Raised when data parsing fails"""
+    pass
+
+class RetryExhaustedError(WaterMonitorException):
+    """Raised when all retry attempts are exhausted"""
+    pass