Fix: All filter conditions working correctly - 49/49 tests passed (100% validation)

🚀 Add comprehensive vehicle route tracking system

Fix: NLP-to-SQL now handles multiple vehicles and multiple locations with proper OR logic

Fix: Add database engine None checks to prevent 500 errors

Fix: Optional imports and database connection timeout handling

Upgrade: Production-grade hybrid NLP engine with date ranges, time ranges, advanced aggregations, and 30+ helper functions

Upgrade: Professional multi-filter NLP-to-SQL engine with support for combined queries, synonyms, and all intent types

Fix: Major UI responsiveness improvements - remove demo.load() blocking, fix Chatbot format for Gradio 6.14.0, add timeout handling to all queries, fix save_detection column mapping

Improve: Add configuration checks, environment validation, and better error messages for missing HF_TOKEN and DATABASE_URL

Update: Integrate Mistral-7B-Instruct-v0.2 model for NLP-to-SQL engine and add database functions

feat: implement advanced hybrid rule-based + LLM NLP-to-SQL engine

fix: use engine.begin() for transactions, add error handling to all database functions

fix: add schema migration to handle missing columns in existing tables

fix: add graceful error handling for missing environment variables on HF Spaces

refactor: modularize codebase with SQL validation, improved schema, and security measures