Re_Backend/AUTO_MIGRATION_SETUP_COMPLETE.md

✅ Auto-Migration Setup Complete

🎯 What Was Done

1. Converted SQL Migration to TypeScript

Before: src/migrations/add_is_skipped_to_approval_levels.sql (manual SQL)
After: src/migrations/20251105-add-skip-fields-to-approval-levels.ts (TypeScript)

Features Added to approval_levels table:

• ✅ is_skipped - Boolean flag to track skipped approvers
• ✅ skipped_at - Timestamp when approver was skipped
• ✅ skipped_by - Foreign key to user who skipped
• ✅ skip_reason - Text field for skip justification
• ✅ Partial index on is_skipped = TRUE for query performance
• ✅ Full rollback support in down() function

2. Updated Migration Runner

File: src/scripts/migrate.ts

Changes:

• Added import for new migration (m14)
• Added execution in run() function
• Enhanced console output with emojis for better visibility
• Better error messages

3. Auto-Run Migrations on Development Start

File: package.json

Before:

"dev": "nodemon --exec ts-node -r tsconfig-paths/register src/server.ts"

After:

"dev": "npm run migrate && nodemon --exec ts-node -r tsconfig-paths/register src/server.ts"

What This Means:

• 🔄 Migrations run automatically before server starts
• ✅ No more manual migration steps
• 🛡️ Server won't start if migrations fail
• ⚡ Fresh database schema on every dev restart

4. Created Documentation

• 📘 MIGRATION_WORKFLOW.md - Complete migration guide
• 📗 MIGRATION_QUICK_REFERENCE.md - Quick reference card
• 📕 AUTO_MIGRATION_SETUP_COMPLETE.md - This file

🚀 How to Use

Starting Development (Most Common)

npm run dev

This will:

1. Connect to database
2. Run all 14 migrations sequentially
3. Start development server with hot reload
4. Display success messages

Expected Output:

📦 Database connected
🔄 Running migrations...

✅ Created workflow_requests table
✅ Created approval_levels table
...
✅ Added skip-related fields to approval_levels table

✅ All migrations applied successfully
🚀 Server running on port 5000

Running Migrations Only

npm run migrate

Use when you want to update database without starting server.

📊 Migration Status

#	Migration	Status	Date
1	create-workflow-requests	✅ Active	2025-10-30
2	create-approval-levels	✅ Active	2025-10-30
3	create-participants	✅ Active	2025-10-30
4	create-documents	✅ Active	2025-10-30
5	create-subscriptions	✅ Active	2025-10-31
6	create-activities	✅ Active	2025-10-31
7	create-work-notes	✅ Active	2025-10-31
8	create-work-note-attachments	✅ Active	2025-10-31
9	add-tat-alert-fields	✅ Active	2025-11-04
10	create-tat-alerts	✅ Active	2025-11-04
11	create-kpi-views	✅ Active	2025-11-04
12	create-holidays	✅ Active	2025-11-04
13	create-admin-config	✅ Active	2025-11-04
14	add-skip-fields-to-approval-levels	✅ NEW	2025-11-05

🔄 Adding Future Migrations

When you need to add a new migration:

Step 1: Create File

# Create file: src/migrations/20251106-your-description.ts

Step 2: Write Migration

import { QueryInterface, DataTypes } from 'sequelize';

export async function up(queryInterface: QueryInterface): Promise<void> {
  // Your changes here
  await queryInterface.addColumn('table', 'column', {
    type: DataTypes.STRING
  });
  console.log('✅ Your migration completed');
}

export async function down(queryInterface: QueryInterface): Promise<void> {
  // Rollback here
  await queryInterface.removeColumn('table', 'column');
  console.log('✅ Rollback completed');
}

Step 3: Register in migrate.ts

// Add at top
import * as m15 from '../migrations/20251106-your-description';

// Add in run() function after m14
await (m15 as any).up(sequelize.getQueryInterface());

Step 4: Test

npm run migrate
# or
npm run dev

🎯 Benefits

For Development

• ✅ No manual steps - migrations run automatically
• ✅ Consistent state - everyone on team has same schema
• ✅ Error prevention - server won't start with schema mismatch
• ✅ Fast iteration - add migration, restart, test

For Production

• ✅ Idempotent - safe to run multiple times
• ✅ Versioned - migrations tracked in git
• ✅ Rollback support - down() functions for reverting
• ✅ Error handling - clear failure messages

For Team

• ✅ TypeScript - type-safe migrations
• ✅ Documentation - comprehensive guides
• ✅ Best practices - professional .NET team standards
• ✅ Clear workflow - easy to onboard new developers

🛡️ Safety Features

Migration Execution

• Stops on first error
• Exits with error code 1 on failure
• Prevents server startup if migrations fail
• Detailed error logging

Idempotency

All migrations should be idempotent (safe to run multiple times):

// Check before adding
const tableDesc = await queryInterface.describeTable('table');
if (!tableDesc.column) {
  await queryInterface.addColumn(/* ... */);
}

Transactions

For complex migrations, wrap in transaction:

const transaction = await queryInterface.sequelize.transaction();
try {
  await queryInterface.addColumn(/* ... */, { transaction });
  await queryInterface.addIndex(/* ... */, { transaction });
  await transaction.commit();
} catch (error) {
  await transaction.rollback();
  throw error;
}

📝 Database Structure Reference

Always refer to backend_structure.txt for:

• Current table schemas
• Column types and constraints
• Foreign key relationships
• Enum values
• Index definitions

🧪 Testing the Setup

Test Migration System

# Run migrations
npm run migrate

# Should see:
# 📦 Database connected
# 🔄 Running migrations...
# ✅ [migration messages]
# ✅ All migrations applied successfully

Test Auto-Run on Dev

# Start development
npm run dev

# Should see migrations run, then:
# 🚀 Server running on port 5000
# 📊 Environment: development
# ...

Test New Migration

1. Create test migration file
2. Register in migrate.ts
3. Run npm run dev
4. Verify migration executed
5. Check database schema

🎓 Pro Tips

1. Always test locally first - never test migrations in production
2. Backup before migrating - especially in production
3. Keep migrations atomic - one logical change per file
4. Write descriptive names - make purpose clear
5. Add comments - explain why, not just what
6. Test rollbacks - verify down() functions work
7. Update documentation - keep backend_structure.txt current
8. Review before committing - migrations are permanent

📞 Support

• 📘 Full Guide: MIGRATION_WORKFLOW.md
• 📗 Quick Reference: MIGRATION_QUICK_REFERENCE.md
• 📊 Database Structure: backend_structure.txt

✨ Summary

Your development workflow is now streamlined:

# That's it! This one command does everything:
npm run dev

# 1. Runs all migrations ✅
# 2. Starts development server ✅
# 3. Enables hot reload ✅
# 4. You focus on coding ✅

---

Setup Date: November 5, 2025
Total Migrations: 14
Auto-Run: ✅ Enabled
Status: 🟢 Production Ready
Team: Royal Enfield .NET Expert Team