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SECURITY.md

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+# Security Guide - Delphi Consulting Group Database System
+
+This document outlines the comprehensive security measures implemented to protect sensitive data and prevent accidental exposure of secrets.
+
+## 🛡️ Security Architecture
+
+### Multi-Layer Protection
+1. **Environment Variables** - All secrets stored in `.env` files
+2. **Git Ignore Rules** - Comprehensive patterns to prevent sensitive file commits
+3. **Pre-commit Hooks** - Automated checks before code commits
+4. **Docker Security** - Non-root containers, secure file permissions
+5. **Access Control** - JWT-based authentication with role separation
+
+## 🔐 Environment Security
+
+### Automated Setup
+```bash
+# Generate secure configuration
+python scripts/setup-security.py
+```
+
+**What it creates:**
+- Cryptographically secure `SECRET_KEY` (32-byte URL-safe)
+- Strong admin password (16 chars, mixed complexity)
+- Proper CORS configuration
+- Secure file permissions (600) on `.env`
+
+### Manual Security Checklist
+- [ ] Change default `SECRET_KEY` in production
+- [ ] Use strong admin passwords (16+ characters)
+- [ ] Configure CORS for your domain only
+- [ ] Enable HTTPS in production
+- [ ] Set secure cookie flags
+- [ ] Configure rate limiting
+- [ ] Regular security updates
+
+## 📁 File Protection
+
+### .gitignore Security Patterns
+**Critical files that are NEVER committed:**
+```bash
+# Environment & Secrets
+.env*
+*.env
+
+# Database files (contain customer data)
+*.db
+*.sqlite
+*.sqlite3
+delphi_database.db
+
+# Backup files (contain sensitive data)  
+backups/
+*.backup
+*.bak
+*.dump
+
+# Upload files (user documents)
+uploads/
+user-uploads/
+
+# SSL certificates & keys
+ssl/
+*.pem
+*.key
+*.crt
+*.cert
+
+# Legacy Pascal files (old database system)
+*.SC
+*.SC2
+*.LIB
+```
+
+### File Attribute Security
+**`.gitattributes` ensures:**
+- Database files treated as binary (prevents corruption)
+- SSL certificates treated as binary (security)
+- Legacy Pascal files preserved in original format
+- Environment files tracked for proper diff/merge
+
+## 🔒 Git Hooks Protection
+
+### Pre-commit Hook Features
+```bash
+# Install security hooks
+./scripts/install-git-hooks.sh
+```
+
+**Automatic Protection Against:**
+- Environment files (`.env`)
+- Database files (`*.db`, `*.sqlite`)
+- Backup files (`backups/`, `*.backup`)
+- SSL certificates (`*.pem`, `*.key`)
+- Upload directories
+- Large files (>1MB, potential data dumps)
+- Common secret patterns in code
+
+**Hook Actions:**
+- ❌ **BLOCKS** commits with security violations
+- ⚠️ **WARNS** about potential issues
+- ✅ **ALLOWS** safe commits to proceed
+
+### Bypass (Emergency Only)
+```bash
+# NOT RECOMMENDED - only for emergencies
+git commit --no-verify
+```
+
+## 🐳 Docker Security
+
+### Container Hardening
+- **Non-root user** (UID/GID 1001)
+- **Minimal base image** (Python slim)
+- **Read-only filesystem** where possible  
+- **Health checks** for monitoring
+- **Resource limits** to prevent DoS
+- **Secure volume mounts**
+
+### Production Security
+```bash
+# Production environment
+DEBUG=False
+SECURE_COOKIES=True
+SECURE_SSL_REDIRECT=True
+```
+
+### Network Security
+- **Nginx reverse proxy** with rate limiting
+- **SSL/TLS termination**
+- **Security headers** (HSTS, XSS protection, etc.)
+- **CORS restrictions**
+- **API rate limiting**
+
+## 🚨 Incident Response
+
+### If Secrets Are Accidentally Committed
+
+#### 1. Immediate Actions
+```bash
+# Remove from staging immediately
+git reset HEAD .env
+
+# If already committed locally (not pushed)
+git reset --hard HEAD~1
+
+# If already pushed to remote
+git revert <commit-hash>
+```
+
+#### 2. Rotate All Compromised Secrets
+- Generate new `SECRET_KEY`
+- Change admin passwords
+- Rotate API keys
+- Update SSL certificates if exposed
+- Notify security team
+
+#### 3. Clean Git History (if necessary)
+```bash
+# WARNING: This rewrites history - coordinate with team
+git filter-branch --force --index-filter \
+  'git rm --cached --ignore-unmatch .env' \
+  --prune-empty --tag-name-filter cat -- --all
+
+# Force push (dangerous)
+git push origin --force --all
+```
+
+### If Database Is Compromised
+1. **Immediate containment** - Stop all services
+2. **Assess scope** - What data was exposed?
+3. **Notify stakeholders** - Legal, compliance, customers
+4. **Restore from backup** - Last known clean state
+5. **Forensic analysis** - How did it happen?
+6. **Strengthen defenses** - Prevent recurrence
+
+## 📊 Security Monitoring
+
+### Health Checks
+```bash
+# Application health
+curl http://localhost:6920/health
+
+# Container health
+docker ps --format "table {{.Names}}\t{{.Status}}"
+
+# Security scan
+docker scan delphi-database:latest
+```
+
+### Log Monitoring
+```bash
+# Application logs
+docker logs -f delphi-database
+
+# Security events
+grep -i "error\|fail\|security" logs/*.log
+
+# Failed login attempts
+grep "401\|403" access.log
+```
+
+### Regular Security Tasks
+- [ ] **Weekly**: Review access logs
+- [ ] **Monthly**: Update dependencies  
+- [ ] **Quarterly**: Security assessment
+- [ ] **Annually**: Penetration testing
+- [ ] **As needed**: Incident response drills
+
+## 🎯 Security Standards Compliance
+
+### Data Protection
+- **Encryption at rest** (database files)
+- **Encryption in transit** (HTTPS/TLS)
+- **Access logging** (authentication events)
+- **Data retention** policies
+- **Regular backups** with encryption
+
+### Authentication & Authorization
+- **JWT tokens** with expiration
+- **Password hashing** (bcrypt)
+- **Role-based access** (User/Admin)
+- **Session management**
+- **Account lockout** protection
+
+### Network Security
+- **Firewall rules**
+- **Rate limiting**
+- **CORS policies**
+- **Security headers**
+- **SSL/TLS encryption**
+
+## 🆘 Emergency Contacts
+
+### Security Issues
+- **Primary**: System Administrator
+- **Secondary**: IT Security Team
+- **Escalation**: Management Team
+
+### Incident Reporting
+1. **Immediate**: Stop affected services
+2. **Within 1 hour**: Notify security team
+3. **Within 24 hours**: Document incident
+4. **Within 72 hours**: Complete investigation
+
+---
+
+## ✅ Security Verification Checklist
+
+Before going to production, verify:
+
+- [ ] Environment secrets configured securely
+- [ ] Git hooks installed and working
+- [ ] .gitignore prevents sensitive file commits
+- [ ] SSL/HTTPS configured properly
+- [ ] Database backups encrypted and tested
+- [ ] Access logs enabled and monitored
+- [ ] Rate limiting configured
+- [ ] Security headers enabled
+- [ ] Container runs as non-root user
+- [ ] Firewall rules configured
+- [ ] Incident response plan documented
+- [ ] Team trained on security procedures
+
+**Remember: Security is everyone's responsibility!**