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Marcelo b66cb97f16 MVP

2025-11-28 09:11:59 -06:00

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Data Persistence Implementation - Complete Package

Overview

This package contains everything needed to implement Issue #1: Data Persistence from the optimization requirements. This enables crash recovery and session restoration for your KPI tracking system.

📦 Package Contents

📄 Documentation Files

IMPLEMENTATION_GUIDE.md ⭐ START HERE
- Detailed step-by-step implementation instructions
- Flow diagrams and wiring guides
- Testing procedures
- Troubleshooting guide
IMPLEMENTATION_SUMMARY.md
- High-level overview
- What problems this solves
- Expected outcomes
- Quick reference
NODE_CONFIGURATION.md
- Exact node configuration settings
- Wiring reference
- Complete flow diagrams
- Common mistakes to avoid
IMPLEMENTATION_CHECKLIST.txt
- Printable checklist format
- Phase-by-phase tasks
- Testing checklist
- Sign-off section
DATA_PERSISTENCE_README.md (this file)
- Package overview and file index

💾 Database Files

create_session_state_table.sql
- MySQL table schema
- Creates session_state table
- Includes indexes for performance

🔧 Modified Function Code

modified_machine_cycles.js
- Enhanced Machine cycles function
- Adds database persistence
- Throttled sync every 5 seconds
- Requires 3 outputs (adds 1 new)
modified_work_order_buttons.js
- Enhanced Work Order buttons function
- Adds session management
- Database sync on state changes
- Requires 5 outputs (adds 1 new)

🆕 New Function Code (Recovery)

startup_recovery_query.js
- Queries for previous session on startup
- Triggered by inject node
process_recovery_response.js
- Processes database query results
- Detects stale sessions (>24 hours)
- Generates user prompts
restore_session.js
- Restores previous session state
- Reactivates work order
- Restores all context variables
start_fresh.js
- Starts with clean slate
- Deactivates old session
- Clears all counters

📚 Reference Implementation (Optional)

session_state_functions.js
- Modular alternative implementation
- Can be used as reference
- Includes all helper functions

🚀 Quick Start

For First-Time Implementation:

Read IMPLEMENTATION_SUMMARY.md (5 min)
Follow IMPLEMENTATION_GUIDE.md step-by-step (1-2 hours)
Use IMPLEMENTATION_CHECKLIST.txt to track progress
Reference NODE_CONFIGURATION.md when configuring nodes

For Quick Reference:

Checklist: IMPLEMENTATION_CHECKLIST.txt
Node Config: NODE_CONFIGURATION.md
SQL Queries: create_session_state_table.sql

📊 What This Implements

Problem Solved

✅ System survives crashes and reboots
✅ No data loss during power failures
✅ Session restoration on startup
✅ Accurate KPI tracking across restarts

Technical Details

Database: MySQL/MariaDB
Sync Frequency: Every 5 seconds (throttled)
Recovery Time: <1 second on startup
Data Loss Risk: Maximum 5 seconds of data

Key Features

Automatic session backup
User-prompted restoration
Stale session detection (>24 hours)
Complete audit trail
Zero-impact performance

📁 File Usage Matrix

File	Phase	Required	Usage
IMPLEMENTATION_GUIDE.md	All	✅	Primary guide
IMPLEMENTATION_SUMMARY.md	Planning	✅	Overview
NODE_CONFIGURATION.md	Implementation	✅	Node setup
IMPLEMENTATION_CHECKLIST.txt	Implementation	✅	Task tracking
create_session_state_table.sql	Database Setup	✅	Run once
modified_machine_cycles.js	Implementation	✅	Replace code
modified_work_order_buttons.js	Implementation	✅	Replace code
startup_recovery_query.js	Implementation	✅	New function
process_recovery_response.js	Implementation	✅	New function
restore_session.js	Implementation	✅	New function
start_fresh.js	Implementation	✅	New function
session_state_functions.js	Reference	❌	Optional
DATA_PERSISTENCE_README.md	Overview	ℹ️	This file

⏱️ Time Estimates

Phase	Time	Complexity
Database Setup	10 min	Easy
Update Machine Cycles	15 min	Medium
Update Work Order Buttons	15 min	Medium
Create Recovery Flow	30 min	Medium
UI Integration	20 min	Medium-Hard
Testing	30 min	Easy
Total	2 hours	Medium

🎯 Success Criteria

After implementation, you should be able to:

Start a work order and run cycles
Stop Node-RED mid-production
Restart Node-RED
See recovery prompt with accurate data
Restore session successfully
Continue production without data loss
See session history in database

🔍 Testing Quick Commands

Check Session State

SELECT * FROM session_state WHERE is_active = 1;

View Session History

SELECT session_id, cycle_count, active_work_order_id,
       FROM_UNIXTIME(updated_at/1000) as last_update
FROM session_state
ORDER BY updated_at DESC LIMIT 10;

Simulate Crash

sudo systemctl stop nodered
# Wait 10 seconds
sudo systemctl start nodered

Watch Logs

journalctl -u nodered -f

🆘 Getting Help

If Something Goes Wrong

Check IMPLEMENTATION_GUIDE.md troubleshooting section
Verify checklist completion in IMPLEMENTATION_CHECKLIST.txt
Check Node-RED debug panel for errors
Review NODE_CONFIGURATION.md for wiring mistakes
Check database logs for SQL errors

Common Issues

No recovery prompt: Check inject node timing (0.1 sec)
Wrong data restored: Check JSON escaping in SQL
Sync not working: Verify MySQL node configuration
Performance issues: Check throttle interval (5 sec)

📈 Next Steps

After successful implementation:

Test thoroughly (minimum 30 minutes)
Train operators on recovery prompts
Monitor for 1 week to ensure stability
Proceed to Issue #4: Intelligent Downtime Categorization
Proceed to Issue #5: Session Management

📋 Implementation Order

1. Read Documentation (IMPLEMENTATION_SUMMARY.md)
   ↓
2. Create Database Table (create_session_state_table.sql)
   ↓
3. Update Machine Cycles (modified_machine_cycles.js)
   ↓
4. Update Work Order Buttons (modified_work_order_buttons.js)
   ↓
5. Create Recovery Flow (startup_recovery_query.js + others)
   ↓
6. Add UI Elements (prompts, notifications)
   ↓
7. Deploy and Test (IMPLEMENTATION_CHECKLIST.txt)
   ↓
8. Monitor and Validate (1 week)
   ↓
9. Mark Complete and Proceed to Next Issue

🔐 Security Notes

Database credentials: Use environment variables or secure storage
Session data: Contains work order details (not sensitive)
User prompts: No authentication required (internal system)
SQL injection: All values are escaped properly

🧪 Development vs Production

Development Environment

Keep debug nodes enabled
Test with short timeout intervals
Monitor logs continuously
Test all failure scenarios

Production Environment

Remove or disable debug nodes
Use standard 5-second throttle
Set up automated monitoring
Document recovery procedures for operators

📝 Version History

Version	Date	Changes
1.0	2025-11-21	Initial implementation package

👥 Support Resources

Primary Documentation: IMPLEMENTATION_GUIDE.md
Optimization Requirements: /home/mdares/.node-red/optimization_prompt.txt
Node-RED Logs: journalctl -u nodered -f
Database Logs: Check MySQL/MariaDB logs

✅ Pre-Implementation Checklist

Before starting implementation:

Node-RED is running and accessible
MySQL/MariaDB database is accessible
Database credentials available
Backup of current flows.json exists
Time allocated (2 hours)
Test environment available (or production downtime scheduled)
All documentation files reviewed

🎓 Key Concepts

Session ID

Unique identifier for each production session. Created when work order starts.

Throttled Sync

Database writes limited to once every 5 seconds to reduce overhead.

Forced Sync

Immediate database write on critical events (START, STOP, complete).

Stale Session

Session older than 24 hours, automatically discarded on startup.

Active Session

Current production session with is_active = 1 in database.

🏁 Ready to Begin?

✅ Read this README
⬜ Read IMPLEMENTATION_SUMMARY.md
⬜ Open IMPLEMENTATION_GUIDE.md
⬜ Print IMPLEMENTATION_CHECKLIST.txt
⬜ Begin implementation

Good luck with your implementation!

For questions or issues, refer to the troubleshooting sections in:

IMPLEMENTATION_GUIDE.md (detailed)
NODE_CONFIGURATION.md (configuration-specific)
IMPLEMENTATION_CHECKLIST.txt (quick reference)

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