Improve application deployment and database connection reliability

Refactors Docker configuration and entrypoint script for robust PostgreSQL connectivity and health checks.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: dec54137-d5a2-4406-8ad4-5f2f9fb110bf
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/5d315300-98fa-429a-abb0-4fdce6a2e3c9.jpg

replit.md

@@ -339,6 +339,16 @@ Preferred communication style: Simple, everyday language.
 - ✅ Optimized build process with simplified entry point (node dist/index.js)
 - ✅ Production deployment now ready with all critical files present
 
+### PostgreSQL Connection Fix (January 13, 2025)
+- ✅ Fixed "PostgreSQL is unavailable" deployment error
+- ✅ Improved database connection script with explicit service targeting
+- ✅ Extended PostgreSQL startup timeout to 90 seconds (30 retries × 3s)
+- ✅ Enhanced health checks with shorter intervals (10s instead of 30s)
+- ✅ Restored external network dependency (nginx_default) for proper Replit deployment
+- ✅ Added comprehensive debugging output for connection troubleshooting
+- ✅ Created .env.example template for environment configuration
+- ✅ Optimized Docker Compose for maximum deployment compatibility
+
 ### Portainer Deployment Fix (January 10, 2025)
 - ✅ Resolved Docker image pull error "regisflow-regisflow:latest" in Portainer
 - ✅ Created local image building solution with "regisflow:latest" tag