Upload 18 files

.dockerignore

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+# Ignore node_modules
+node_modules/
+
+# Ignore development files
+.env
+.env.local
+.env.development
+
+# Ignore git
+.git/
+.gitignore
+
+# Ignore logs
+*.log
+npm-debug.log*
+
+# Ignore test files
+*.test.js
+test/
+
+# Ignore documentation
+README.md
+docs/
+
+# Ignore database scripts (no seeding/reset)
+src/db/seed.js
+src/db/reset.js

.gitattributes

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-*tfevents* filter=lfs diff=lfs merge=lfs -text
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+*.lfs.* filter=lfs diff=lfs merge=lfs -text
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+saved_model/**/* filter=lfs diff=lfs merge=lfs -text
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+*tfevents* filter=lfs diff=lfs merge=lfs -text

.gitignore

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+node_modules/
+.env
+*.log
+.DS_Store

Dockerfile

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+# Use lightweight Node.js Alpine image
+FROM node:18-alpine
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install production dependencies only
+RUN npm ci --only=production
+
+# Copy source code
+COPY src ./src
+
+# Expose Hugging Face port
+EXPOSE 7860
+
+# Set NODE_ENV to production
+ENV NODE_ENV=production
+ENV PORT=7860
+
+# Start the server
+CMD ["node", "src/server.js"]

QUICKSTART.md

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+# Quick Start Guide
+
+## ✅ Backend is Ready!
+
+Your complete Express.js backend with PostgreSQL is now running on **http://localhost:4000**
+
+## 🚀 What's Been Done
+
+1. ✅ **Database Setup**
+   - Created 7 tables with proper relationships
+   - Added indexes for performance
+   - Seeded with sample data
+
+2. ✅ **API Endpoints Working**
+   - Parties API: `/api/parties`
+   - Mirchi Types API: `/api/mirchi-types`
+   - Lots API: `/api/lots`
+   - Transactions API: `/api/transactions`
+
+3. ✅ **Sample Data Loaded**
+   - 5 Parties (Ramesh Traders, Suresh & Co, etc.)
+   - 5 Mirchi Types (Teja, Byadgi, Guntur Sannam, etc.)
+   - 3 Active Lots with stock
+   - 1 Sample Transaction
+
+## 🔧 Available Commands
+
+```bash
+cd backend
+
+# Start server (currently running)
+npm start
+
+# Development mode with auto-reload
+npm run dev
+
+# Database management
+npm run migrate  # Create tables
+npm run seed     # Add sample data
+npm run reset    # Drop all tables (⚠️ use with caution)
+```
+
+## 📡 Test the API
+
+**Health Check:**
+```bash
+curl http://localhost:4000/health
+```
+
+**Get All Parties:**
+```bash
+curl http://localhost:4000/api/parties
+```
+
+**Get All Mirchi Types:**
+```bash
+curl http://localhost:4000/api/mirchi-types
+```
+
+**Get All Transactions:**
+```bash
+curl http://localhost:4000/api/transactions
+```
+
+## 🔗 Connect Frontend
+
+Update your frontend's `db.ts` file:
+- The API_BASE is already set to `http://localhost:4000/api`
+- All endpoints are ready to use
+- No changes needed in frontend code!
+
+## 📊 Database Schema
+
+**Tables:**
+1. `parties` - Customer/supplier management
+2. `mirchi_types` - Chili pepper varieties
+3. `lots` - Inventory with stock tracking
+4. `transactions` - Purchase/sales bills
+5. `transaction_items` - Line items
+6. `expenses` - Transaction expenses
+7. `payments` - Payment records
+
+## 🎯 Next Steps
+
+1. Keep the backend server running
+2. Start your frontend: `cd frontend && npm run dev`
+3. Test the complete application!
+
+## 💡 Features
+
+- ✅ Full CRUD operations for all entities
+- ✅ Automatic stock management (lots)
+- ✅ Party balance tracking
+- ✅ Payment tracking with multiple modes
+- ✅ Support for returns (purchase/sales)
+- ✅ Transaction filtering by party, type, etc.
+- ✅ Proper error handling and validation
+
+## 🐛 Troubleshooting
+
+**Server not starting?**
+- Check if port 4000 is available
+- Verify PostgreSQL connection in `.env`
+
+**Database errors?**
+- Run `npm run reset` then `npm run migrate` and `npm run seed`
+
+**API not responding?**
+- Check server logs in terminal
+- Verify server is running on port 4000

package-lock.json

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+{
+  "name": "pattanshetty-backend",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
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+        "dotenv": "^16.3.1",
+        "express": "^4.18.2",
+        "pg": "^8.11.3",
+        "uuid": "^9.0.1"
+      },
+      "devDependencies": {
+        "nodemon": "^3.0.1"
+      }
+    },
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+        "https://github.com/sponsors/ctavan"
+      ],
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+      "bin": {
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+      "license": "MIT",
+      "engines": {
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+    "node_modules/xtend": {
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+      "license": "MIT",
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+    }
+  }
+}

package.json

@@ -0,0 +1,26 @@
+{
+  "name": "pattanshetty-backend",
+  "version": "1.0.0",
+  "description": "Inventory Management Backend API",
+  "main": "src/server.js",
+  "scripts": {
+    "start": "node src/server.js",
+    "dev": "nodemon src/server.js",
+    "migrate": "node src/db/migrate.js",
+    "seed": "node src/db/seed.js",
+    "reset": "node src/db/reset.js"
+  },
+  "keywords": ["inventory", "express", "postgresql"],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^4.18.2",
+    "pg": "^8.11.3",
+    "cors": "^2.8.5",
+    "dotenv": "^16.3.1",
+    "uuid": "^9.0.1"
+  },
+  "devDependencies": {
+    "nodemon": "^3.0.1"
+  }
+}

src/db/ca.pem

@@ -0,0 +1,26 @@
+-----BEGIN CERTIFICATE-----
+MIIEUDCCArigAwIBAgIUfwNzc0s5wNLad9xuTq9aKHnTIckwDQYJKoZIhvcNAQEM
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+rwCc8g==
+-----END CERTIFICATE-----

src/db/config.js

@@ -0,0 +1,55 @@
+const { Pool } = require('pg');
+require('dotenv').config();
+
+const config = {
+    user: process.env.DB_USER || "avnadmin",
+    password: process.env.DB_PASSWORD || "AVNS_8YN2lShyUCy56qezi-_",
+    // Updated Host
+    host: process.env.DB_HOST || "staging-photobrex-3b7a.j.aivencloud.com",
+    // Updated Port
+    port: parseInt(process.env.DB_PORT || "10838"),
+    database: process.env.DB_NAME || "defaultdb",
+    ssl: {
+        rejectUnauthorized: true,
+        // Updated CA Certificate (Hardcoded string as requested)
+        ca: `-----BEGIN CERTIFICATE-----
+MIIEUDCCArigAwIBAgIUNcDCtq9UKVDahrOq1uPUfByWsZswDQYJKoZIhvcNAQEM
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+Bj8KGw==
+-----END CERTIFICATE-----`,
+    },
+};
+
+const pool = new Pool(config);
+
+pool.on('connect', () => {
+    console.log('✅ Connected to PostgreSQL database');
+});
+
+pool.on('error', (err) => {
+    console.error('❌ Unexpected error on idle client', err);
+    process.exit(-1);
+});
+
+module.exports = pool;

src/db/migrate.js

@@ -0,0 +1,166 @@
+const pool = require('./config');
+
+const createTables = async () => {
+    const client = await pool.connect();
+
+    try {
+        console.log('🚀 Starting database migration...');
+
+        await client.query('BEGIN');
+
+        // 1. Create parties table
+        await client.query(`
+      CREATE TABLE IF NOT EXISTS parties (
+        id VARCHAR(50) PRIMARY KEY,
+        name VARCHAR(255) NOT NULL,
+        phone VARCHAR(20),
+        city VARCHAR(100),
+        party_type VARCHAR(20) NOT NULL CHECK (party_type IN ('awaak', 'jawaak', 'both')),
+        current_balance DECIMAL(12, 2) DEFAULT 0,
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+      )
+    `);
+        console.log('✅ Created table: parties');
+
+        // 2. Create mirchi_types table
+        await client.query(`
+      CREATE TABLE IF NOT EXISTS mirchi_types (
+        id VARCHAR(50) PRIMARY KEY,
+        name VARCHAR(100) NOT NULL UNIQUE,
+        current_rate DECIMAL(10, 2) DEFAULT 0,
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+      )
+    `);
+        console.log('✅ Created table: mirchi_types');
+
+        // 3. Create lots table
+        await client.query(`
+      CREATE TABLE IF NOT EXISTS lots (
+        id VARCHAR(50) PRIMARY KEY,
+        lot_number VARCHAR(100) NOT NULL UNIQUE,
+        mirchi_type_id VARCHAR(50) NOT NULL REFERENCES mirchi_types(id) ON DELETE CASCADE,
+        mirchi_name VARCHAR(100) NOT NULL,
+        total_quantity DECIMAL(10, 2) NOT NULL,
+        remaining_quantity DECIMAL(10, 2) NOT NULL,
+        purchase_date DATE NOT NULL,
+        status VARCHAR(20) NOT NULL CHECK (status IN ('active', 'sold_out')),
+        avg_rate DECIMAL(10, 2) NOT NULL,
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+      )
+    `);
+        console.log('✅ Created table: lots');
+
+        // 4. Create transactions table
+        await client.query(`
+      CREATE TABLE IF NOT EXISTS transactions (
+        id VARCHAR(50) PRIMARY KEY,
+        bill_number VARCHAR(100) NOT NULL UNIQUE,
+        bill_date DATE NOT NULL,
+        bill_type VARCHAR(20) NOT NULL CHECK (bill_type IN ('awaak', 'jawaak')),
+        is_return BOOLEAN DEFAULT FALSE,
+        party_id VARCHAR(50) NOT NULL REFERENCES parties(id) ON DELETE CASCADE,
+        party_name VARCHAR(255),
+        gross_weight_total DECIMAL(10, 2) DEFAULT 0,
+        net_weight_total DECIMAL(10, 2) DEFAULT 0,
+        subtotal DECIMAL(12, 2) DEFAULT 0,
+        total_expenses DECIMAL(12, 2) DEFAULT 0,
+        total_amount DECIMAL(12, 2) NOT NULL,
+        paid_amount DECIMAL(12, 2) DEFAULT 0,
+        balance_amount DECIMAL(12, 2) DEFAULT 0,
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+      )
+    `);
+        console.log('✅ Created table: transactions');
+
+        // 5. Create transaction_items table
+        await client.query(`
+      CREATE TABLE IF NOT EXISTS transaction_items (
+        id VARCHAR(50) PRIMARY KEY,
+        transaction_id VARCHAR(50) NOT NULL REFERENCES transactions(id) ON DELETE CASCADE,
+        mirchi_type_id VARCHAR(50) NOT NULL REFERENCES mirchi_types(id),
+        mirchi_name VARCHAR(100),
+        quality VARCHAR(50),
+        lot_id VARCHAR(50) REFERENCES lots(id),
+        poti_weights TEXT,
+        gross_weight DECIMAL(10, 2) NOT NULL,
+        poti_count INTEGER NOT NULL,
+        total_potya DECIMAL(10, 2) DEFAULT 0,
+        net_weight DECIMAL(10, 2) NOT NULL,
+        rate_per_kg DECIMAL(10, 2) NOT NULL,
+        item_total DECIMAL(12, 2) NOT NULL,
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+      )
+    `);
+        console.log('✅ Created table: transaction_items');
+
+        // 6. Create expenses table
+        await client.query(`
+      CREATE TABLE IF NOT EXISTS expenses (
+        id SERIAL PRIMARY KEY,
+        transaction_id VARCHAR(50) NOT NULL REFERENCES transactions(id) ON DELETE CASCADE,
+        cess_percent DECIMAL(5, 2) DEFAULT 0,
+        cess_amount DECIMAL(10, 2) DEFAULT 0,
+        adat_percent DECIMAL(5, 2) DEFAULT 0,
+        adat_amount DECIMAL(10, 2) DEFAULT 0,
+        poti_rate DECIMAL(10, 2) DEFAULT 0,
+        poti_amount DECIMAL(10, 2) DEFAULT 0,
+        hamali_per_poti DECIMAL(10, 2) DEFAULT 0,
+        hamali_amount DECIMAL(10, 2) DEFAULT 0,
+        packaging_hamali_per_poti DECIMAL(10, 2) DEFAULT 0,
+        packaging_hamali_amount DECIMAL(10, 2) DEFAULT 0,
+        gaadi_bharni DECIMAL(10, 2) DEFAULT 0,
+        other_expenses DECIMAL(10, 2) DEFAULT 0,
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+      )
+    `);
+        // Ensure column exists on existing databases as well
+        await client.query(`
+      ALTER TABLE expenses
+      ADD COLUMN IF NOT EXISTS other_expenses DECIMAL(10, 2) DEFAULT 0
+    `);
+        console.log('✅ Created table: expenses');
+
+        // 7. Create payments table
+        await client.query(`
+      CREATE TABLE IF NOT EXISTS payments (
+        id SERIAL PRIMARY KEY,
+        transaction_id VARCHAR(50) NOT NULL REFERENCES transactions(id) ON DELETE CASCADE,
+        mode VARCHAR(20) NOT NULL CHECK (mode IN ('cash', 'online', 'cheque', 'due')),
+        amount DECIMAL(12, 2) NOT NULL,
+        reference VARCHAR(255),
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+      )
+    `);
+        console.log('✅ Created table: payments');
+
+        // Create indexes for better performance
+        await client.query(`
+      CREATE INDEX IF NOT EXISTS idx_transactions_party ON transactions(party_id);
+      CREATE INDEX IF NOT EXISTS idx_transactions_date ON transactions(bill_date);
+      CREATE INDEX IF NOT EXISTS idx_transaction_items_tx ON transaction_items(transaction_id);
+      CREATE INDEX IF NOT EXISTS idx_lots_mirchi ON lots(mirchi_type_id);
+      CREATE INDEX IF NOT EXISTS idx_lots_status ON lots(status);
+    `);
+        console.log('✅ Created indexes');
+
+        await client.query('COMMIT');
+        console.log('✅ Migration completed successfully!');
+
+    } catch (error) {
+        await client.query('ROLLBACK');
+        console.error('❌ Migration failed:', error);
+        throw error;
+    } finally {
+        client.release();
+        await pool.end();
+    }
+};
+
+createTables().catch(err => {
+    console.error('Fatal error:', err);
+    process.exit(1);
+});

src/db/reset.js

@@ -0,0 +1,38 @@
+const pool = require('./config');
+
+const resetDatabase = async () => {
+    const client = await pool.connect();
+
+    try {
+        console.log('🔄 Resetting database...');
+
+        await client.query('BEGIN');
+
+        // Drop all tables in reverse order of dependencies
+        await client.query('DROP TABLE IF EXISTS payments CASCADE');
+        await client.query('DROP TABLE IF EXISTS expenses CASCADE');
+        await client.query('DROP TABLE IF EXISTS transaction_items CASCADE');
+        await client.query('DROP TABLE IF EXISTS transactions CASCADE');
+        await client.query('DROP TABLE IF EXISTS lots CASCADE');
+        await client.query('DROP TABLE IF EXISTS mirchi_types CASCADE');
+        await client.query('DROP TABLE IF EXISTS parties CASCADE');
+
+        await client.query('COMMIT');
+        console.log('✅ Database reset completed!');
+        console.log('💡 Run "npm run migrate" to recreate tables');
+        console.log('💡 Run "npm run seed" to populate with sample data');
+
+    } catch (error) {
+        await client.query('ROLLBACK');
+        console.error('❌ Reset failed:', error);
+        throw error;
+    } finally {
+        client.release();
+        await pool.end();
+    }
+};
+
+resetDatabase().catch(err => {
+    console.error('Fatal error:', err);
+    process.exit(1);
+});

src/db/seed.js

@@ -0,0 +1,143 @@
+const pool = require('./config');
+const { v4: uuidv4 } = require('uuid');
+
+const seedData = async () => {
+    const client = await pool.connect();
+
+    try {
+        console.log('🌱 Starting database seeding...');
+
+        await client.query('BEGIN');
+
+        // 1. Seed Parties
+        const parties = [
+            { id: 'p1', name: 'Ramesh Traders', phone: '9876543210', city: 'Byadgi', party_type: 'both', current_balance: 0 },
+            { id: 'p2', name: 'Suresh & Co', phone: '9876543211', city: 'Guntur', party_type: 'jawaak', current_balance: 0 },
+            { id: 'p3', name: 'Kisan Vyapar', phone: '9876543212', city: 'Nagpur', party_type: 'awaak', current_balance: 0 },
+            { id: 'p4', name: 'Mahesh Enterprises', phone: '9876543213', city: 'Mumbai', party_type: 'both', current_balance: 0 },
+            { id: 'p5', name: 'Ganesh Trading Co', phone: '9876543214', city: 'Pune', party_type: 'jawaak', current_balance: 0 }
+        ];
+
+        for (const party of parties) {
+            await client.query(
+                `INSERT INTO parties (id, name, phone, city, party_type, current_balance) 
+         VALUES ($1, $2, $3, $4, $5, $6) 
+         ON CONFLICT (id) DO NOTHING`,
+                [party.id, party.name, party.phone, party.city, party.party_type, party.current_balance]
+            );
+        }
+        console.log(`✅ Seeded ${parties.length} parties`);
+
+        // 2. Seed Mirchi Types
+        const mirchiTypes = [
+            { id: 'm1', name: 'Teja', current_rate: 180 },
+            { id: 'm2', name: 'Byadgi', current_rate: 220 },
+            { id: 'm3', name: 'Guntur Sannam', current_rate: 150 },
+            { id: 'm4', name: 'Kashmiri', current_rate: 300 },
+            { id: 'm5', name: 'Reshampatti', current_rate: 250 }
+        ];
+
+        for (const type of mirchiTypes) {
+            await client.query(
+                `INSERT INTO mirchi_types (id, name, current_rate) 
+         VALUES ($1, $2, $3) 
+         ON CONFLICT (name) DO NOTHING`,
+                [type.id, type.name, type.current_rate]
+            );
+        }
+        console.log(`✅ Seeded ${mirchiTypes.length} mirchi types`);
+
+        // 3. Seed Lots
+        const lots = [
+            {
+                id: 'l1',
+                lot_number: 'LOT-TEJ-20241120-001',
+                mirchi_type_id: 'm1',
+                mirchi_name: 'Teja',
+                total_quantity: 500,
+                remaining_quantity: 200,
+                purchase_date: '2024-11-20',
+                status: 'active',
+                avg_rate: 175
+            },
+            {
+                id: 'l2',
+                lot_number: 'LOT-BYA-20241121-002',
+                mirchi_type_id: 'm2',
+                mirchi_name: 'Byadgi',
+                total_quantity: 1000,
+                remaining_quantity: 850,
+                purchase_date: '2024-11-21',
+                status: 'active',
+                avg_rate: 210
+            },
+            {
+                id: 'l3',
+                lot_number: 'LOT-GUN-20241122-003',
+                mirchi_type_id: 'm3',
+                mirchi_name: 'Guntur Sannam',
+                total_quantity: 750,
+                remaining_quantity: 600,
+                purchase_date: '2024-11-22',
+                status: 'active',
+                avg_rate: 145
+            }
+        ];
+
+        for (const lot of lots) {
+            await client.query(
+                `INSERT INTO lots (id, lot_number, mirchi_type_id, mirchi_name, total_quantity, remaining_quantity, purchase_date, status, avg_rate) 
+         VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9) 
+         ON CONFLICT (lot_number) DO NOTHING`,
+                [lot.id, lot.lot_number, lot.mirchi_type_id, lot.mirchi_name, lot.total_quantity, lot.remaining_quantity, lot.purchase_date, lot.status, lot.avg_rate]
+            );
+        }
+        console.log(`✅ Seeded ${lots.length} lots`);
+
+        // 4. Seed Sample Transactions
+        const tx1Id = 'tx1';
+        await client.query(
+            `INSERT INTO transactions (id, bill_number, bill_date, bill_type, is_return, party_id, party_name, gross_weight_total, net_weight_total, subtotal, total_expenses, total_amount, paid_amount, balance_amount) 
+       VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14) 
+       ON CONFLICT (bill_number) DO NOTHING`,
+            [tx1Id, 'JAWAAK-2024-0001', '2024-11-20', 'jawaak', false, 'p3', 'Kisan Vyapar', 500, 500, 87500, 4375, 91875, 50000, 41875]
+        );
+
+        await client.query(
+            `INSERT INTO transaction_items (id, transaction_id, mirchi_type_id, mirchi_name, quality, lot_id, poti_weights, gross_weight, poti_count, total_potya, net_weight, rate_per_kg, item_total) 
+       VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13) 
+       ON CONFLICT (id) DO NOTHING`,
+            ['tx1-item1', tx1Id, 'm1', 'Teja', 'A+', 'l1', '[100,100,100,100,100]', 500, 5, 0, 500, 175, 87500]
+        );
+
+        await client.query(
+            `INSERT INTO expenses (transaction_id, cess_percent, cess_amount, adat_percent, adat_amount, hamali_per_poti, hamali_amount) 
+       VALUES ($1, $2, $3, $4, $5, $6, $7)`,
+            [tx1Id, 2.0, 1750, 3.0, 2625, 0, 0]
+        );
+
+        await client.query(
+            `INSERT INTO payments (transaction_id, mode, amount, reference) 
+       VALUES ($1, $2, $3, $4)`,
+            [tx1Id, 'cash', 50000, 'Initial payment']
+        );
+
+        console.log('✅ Seeded sample transaction');
+
+        await client.query('COMMIT');
+        console.log('✅ Seeding completed successfully!');
+
+    } catch (error) {
+        await client.query('ROLLBACK');
+        console.error('❌ Seeding failed:', error);
+        throw error;
+    } finally {
+        client.release();
+        await pool.end();
+    }
+};
+
+seedData().catch(err => {
+    console.error('Fatal error:', err);
+    process.exit(1);
+});

src/db/test-connection.js

@@ -0,0 +1,19 @@
+const pool = require('./config');
+
+async function testConnection() {
+    try {
+        const client = await pool.connect();
+        console.log('✅ Successfully connected to the database!');
+
+        const res = await client.query('SELECT VERSION()');
+        console.log('📊 Database Version:', res.rows[0].version);
+
+        client.release();
+    } catch (err) {
+        console.error('❌ Connection failed:', err);
+    } finally {
+        await pool.end();
+    }
+}
+
+testConnection();

src/routes/lots.js

@@ -0,0 +1,118 @@
+const express = require('express');
+const router = express.Router();
+const pool = require('../db/config');
+
+// GET all lots
+router.get('/', async (req, res) => {
+    try {
+        const { status } = req.query;
+
+        let query = 'SELECT * FROM lots ORDER BY purchase_date DESC';
+        let params = [];
+
+        if (status) {
+            query = 'SELECT * FROM lots WHERE status = $1 ORDER BY purchase_date DESC';
+            params = [status];
+        }
+
+        const result = await pool.query(query, params);
+        res.json(result.rows);
+    } catch (error) {
+        console.error('Error fetching lots:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+// GET active lots with remaining quantity
+router.get('/active', async (req, res) => {
+    try {
+        const result = await pool.query(
+            `SELECT * FROM lots 
+       WHERE status = 'active' AND remaining_quantity > 0 
+       ORDER BY purchase_date DESC`
+        );
+        res.json(result.rows);
+    } catch (error) {
+        console.error('Error fetching active lots:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+// GET lot by ID
+router.get('/:id', async (req, res) => {
+    try {
+        const { id } = req.params;
+        const result = await pool.query(
+            'SELECT * FROM lots WHERE id = $1',
+            [id]
+        );
+
+        if (result.rows.length === 0) {
+            return res.status(404).json({ success: false, message: 'Lot not found' });
+        }
+
+        res.json(result.rows[0]);
+    } catch (error) {
+        console.error('Error fetching lot:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+// GET lots by mirchi type
+router.get('/mirchi/:mirchiTypeId', async (req, res) => {
+    try {
+        const { mirchiTypeId } = req.params;
+        const result = await pool.query(
+            `SELECT * FROM lots 
+       WHERE mirchi_type_id = $1 
+       ORDER BY purchase_date DESC`,
+            [mirchiTypeId]
+        );
+        res.json(result.rows);
+    } catch (error) {
+        console.error('Error fetching lots by mirchi type:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+// POST check if lot number is unique
+router.post('/check-unique', async (req, res) => {
+    try {
+        const { lot_number } = req.body;
+
+        if (!lot_number) {
+            return res.status(400).json({ success: false, message: 'Lot number is required' });
+        }
+
+        const result = await pool.query(
+            'SELECT id FROM lots WHERE lot_number = $1',
+            [lot_number]
+        );
+
+        res.json({ exists: result.rows.length > 0 });
+    } catch (error) {
+        console.error('Error checking lot uniqueness:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+// GET available lots for a mirchi type (with remaining quantity > 0)
+router.get('/available/:mirchiTypeId', async (req, res) => {
+    try {
+        const { mirchiTypeId } = req.params;
+        const result = await pool.query(
+            `SELECT * FROM lots 
+       WHERE mirchi_type_id = $1 
+       AND status = 'active' 
+       AND remaining_quantity > 0 
+       ORDER BY purchase_date DESC`,
+            [mirchiTypeId]
+        );
+        res.json(result.rows);
+    } catch (error) {
+        console.error('Error fetching available lots:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+module.exports = router;

src/routes/mirchiTypes.js

@@ -0,0 +1,120 @@
+const express = require('express');
+const router = express.Router();
+const pool = require('../db/config');
+const { v4: uuidv4 } = require('uuid');
+
+// GET all mirchi types
+router.get('/', async (req, res) => {
+    try {
+        const result = await pool.query(
+            'SELECT * FROM mirchi_types ORDER BY name ASC'
+        );
+        res.json(result.rows);
+    } catch (error) {
+        console.error('Error fetching mirchi types:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+// GET mirchi type by ID
+router.get('/:id', async (req, res) => {
+    try {
+        const { id } = req.params;
+        const result = await pool.query(
+            'SELECT * FROM mirchi_types WHERE id = $1',
+            [id]
+        );
+
+        if (result.rows.length === 0) {
+            return res.status(404).json({ success: false, message: 'Mirchi type not found' });
+        }
+
+        res.json(result.rows[0]);
+    } catch (error) {
+        console.error('Error fetching mirchi type:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+// POST create or update mirchi type
+router.post('/', async (req, res) => {
+    const client = await pool.connect();
+
+    try {
+        const { id, name, current_rate } = req.body;
+
+        if (!name) {
+            return res.status(400).json({ success: false, message: 'Mirchi type name is required' });
+        }
+
+        const typeId = id || uuidv4();
+
+        await client.query('BEGIN');
+
+        // Check if type exists
+        const existing = await client.query('SELECT id FROM mirchi_types WHERE id = $1', [typeId]);
+
+        let result;
+        if (existing.rows.length > 0) {
+            // Update existing type
+            result = await client.query(
+                `UPDATE mirchi_types 
+         SET name = $1, current_rate = $2, updated_at = CURRENT_TIMESTAMP 
+         WHERE id = $3 
+         RETURNING *`,
+                [name, current_rate || 0, typeId]
+            );
+        } else {
+            // Insert new type
+            result = await client.query(
+                `INSERT INTO mirchi_types (id, name, current_rate) 
+         VALUES ($1, $2, $3) 
+         RETURNING *`,
+                [typeId, name, current_rate || 0]
+            );
+        }
+
+        await client.query('COMMIT');
+
+        res.json({
+            success: true,
+            data: result.rows[0],
+            message: existing.rows.length > 0 ? 'Mirchi type updated successfully' : 'Mirchi type created successfully'
+        });
+
+    } catch (error) {
+        await client.query('ROLLBACK');
+        console.error('Error saving mirchi type:', error);
+
+        if (error.code === '23505') { // Unique constraint violation
+            return res.status(400).json({ success: false, message: 'Mirchi type with this name already exists' });
+        }
+
+        res.status(500).json({ success: false, message: error.message });
+    } finally {
+        client.release();
+    }
+});
+
+// DELETE mirchi type
+router.delete('/:id', async (req, res) => {
+    try {
+        const { id } = req.params;
+
+        const result = await pool.query(
+            'DELETE FROM mirchi_types WHERE id = $1 RETURNING *',
+            [id]
+        );
+
+        if (result.rows.length === 0) {
+            return res.status(404).json({ success: false, message: 'Mirchi type not found' });
+        }
+
+        res.json({ success: true, message: 'Mirchi type deleted successfully' });
+    } catch (error) {
+        console.error('Error deleting mirchi type:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+module.exports = router;

src/routes/parties.js

@@ -0,0 +1,115 @@
+const express = require('express');
+const router = express.Router();
+const pool = require('../db/config');
+const { v4: uuidv4 } = require('uuid');
+
+// GET all parties
+router.get('/', async (req, res) => {
+    try {
+        const result = await pool.query(
+            'SELECT * FROM parties ORDER BY name ASC'
+        );
+        res.json(result.rows);
+    } catch (error) {
+        console.error('Error fetching parties:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+// GET party by ID
+router.get('/:id', async (req, res) => {
+    try {
+        const { id } = req.params;
+        const result = await pool.query(
+            'SELECT * FROM parties WHERE id = $1',
+            [id]
+        );
+
+        if (result.rows.length === 0) {
+            return res.status(404).json({ success: false, message: 'Party not found' });
+        }
+
+        res.json(result.rows[0]);
+    } catch (error) {
+        console.error('Error fetching party:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+// POST create or update party
+router.post('/', async (req, res) => {
+    const client = await pool.connect();
+
+    try {
+        const { id, name, phone, city, party_type, current_balance } = req.body;
+
+        if (!name) {
+            return res.status(400).json({ success: false, message: 'Party name is required' });
+        }
+
+        const partyId = id || uuidv4();
+
+        await client.query('BEGIN');
+
+        // Check if party exists
+        const existing = await client.query('SELECT id FROM parties WHERE id = $1', [partyId]);
+
+        let result;
+        if (existing.rows.length > 0) {
+            // Update existing party
+            result = await client.query(
+                `UPDATE parties 
+         SET name = $1, phone = $2, city = $3, party_type = $4, current_balance = $5, updated_at = CURRENT_TIMESTAMP 
+         WHERE id = $6 
+         RETURNING *`,
+                [name, phone || '', city || '', party_type || 'both', current_balance || 0, partyId]
+            );
+        } else {
+            // Insert new party
+            result = await client.query(
+                `INSERT INTO parties (id, name, phone, city, party_type, current_balance) 
+         VALUES ($1, $2, $3, $4, $5, $6) 
+         RETURNING *`,
+                [partyId, name, phone || '', city || '', party_type || 'both', current_balance || 0]
+            );
+        }
+
+        await client.query('COMMIT');
+
+        res.json({
+            success: true,
+            data: result.rows[0],
+            message: existing.rows.length > 0 ? 'Party updated successfully' : 'Party created successfully'
+        });
+
+    } catch (error) {
+        await client.query('ROLLBACK');
+        console.error('Error saving party:', error);
+        res.status(500).json({ success: false, message: error.message });
+    } finally {
+        client.release();
+    }
+});
+
+// DELETE party
+router.delete('/:id', async (req, res) => {
+    try {
+        const { id } = req.params;
+
+        const result = await pool.query(
+            'DELETE FROM parties WHERE id = $1 RETURNING *',
+            [id]
+        );
+
+        if (result.rows.length === 0) {
+            return res.status(404).json({ success: false, message: 'Party not found' });
+        }
+
+        res.json({ success: true, message: 'Party deleted successfully' });
+    } catch (error) {
+        console.error('Error deleting party:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+module.exports = router;

src/routes/transactions.js

@@ -0,0 +1,533 @@
+const express = require('express');
+const router = express.Router();
+const pool = require('../db/config');
+const { v4: uuidv4 } = require('uuid');
+
+// GET all transactions
+router.get('/', async (req, res) => {
+    try {
+        const { party_id, bill_type, is_return } = req.query;
+
+        let query = `
+      SELECT t.*, 
+             json_agg(DISTINCT jsonb_build_object(
+               'id', ti.id,
+               'mirchi_type_id', ti.mirchi_type_id,
+               'mirchi_name', ti.mirchi_name,
+               'quality', ti.quality,
+               'lot_id', ti.lot_id,
+               'lot_number', l.lot_number,
+               'poti_weights', ti.poti_weights,
+               'gross_weight', ti.gross_weight,
+               'poti_count', ti.poti_count,
+               'total_potya', ti.total_potya,
+               'net_weight', ti.net_weight,
+               'rate_per_kg', ti.rate_per_kg,
+               'item_total', ti.item_total
+             )) FILTER (WHERE ti.id IS NOT NULL) as items,
+             json_build_object(
+               'cess_percent', e.cess_percent,
+               'cess_amount', e.cess_amount,
+               'adat_percent', e.adat_percent,
+               'adat_amount', e.adat_amount,
+               'poti_rate', e.poti_rate,
+               'poti_amount', e.poti_amount,
+               'hamali_per_poti', e.hamali_per_poti,
+               'hamali_amount', e.hamali_amount,
+               'packaging_hamali_per_poti', e.packaging_hamali_per_poti,
+               'packaging_hamali_amount', e.packaging_hamali_amount,
+               'gaadi_bharni', e.gaadi_bharni,
+               'other_expenses', e.other_expenses
+             ) as expenses,
+             json_agg(DISTINCT jsonb_build_object(
+               'mode', p.mode,
+               'amount', p.amount,
+               'reference', p.reference
+             )) FILTER (WHERE p.id IS NOT NULL) as payments
+      FROM transactions t
+      LEFT JOIN transaction_items ti ON t.id = ti.transaction_id
+      LEFT JOIN lots l ON ti.lot_id = l.id
+      LEFT JOIN expenses e ON t.id = e.transaction_id
+      LEFT JOIN payments p ON t.id = p.transaction_id
+    `;
+
+        const conditions = [];
+        const params = [];
+        let paramCount = 1;
+
+        if (party_id) {
+            conditions.push(`t.party_id = $${paramCount}`);
+            params.push(party_id);
+            paramCount++;
+        }
+
+        if (bill_type) {
+            conditions.push(`t.bill_type = $${paramCount}`);
+            params.push(bill_type);
+            paramCount++;
+        }
+
+        if (is_return !== undefined) {
+            conditions.push(`t.is_return = $${paramCount}`);
+            params.push(is_return === 'true');
+            paramCount++;
+        }
+
+        if (conditions.length > 0) {
+            query += ' WHERE ' + conditions.join(' AND ');
+        }
+
+        query += ' GROUP BY t.id, e.id ORDER BY t.bill_date DESC, t.created_at DESC';
+
+        const result = await pool.query(query, params);
+        res.json(result.rows);
+    } catch (error) {
+        console.error('Error fetching transactions:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+// GET transaction by ID
+router.get('/:id', async (req, res) => {
+    try {
+        const { id } = req.params;
+
+        const result = await pool.query(`
+      SELECT t.*, 
+             json_agg(DISTINCT jsonb_build_object(
+               'id', ti.id,
+               'mirchi_type_id', ti.mirchi_type_id,
+               'mirchi_name', ti.mirchi_name,
+               'quality', ti.quality,
+               'lot_id', ti.lot_id,
+               'lot_number', l.lot_number,
+               'poti_weights', ti.poti_weights,
+               'gross_weight', ti.gross_weight,
+               'poti_count', ti.poti_count,
+               'total_potya', ti.total_potya,
+               'net_weight', ti.net_weight,
+               'rate_per_kg', ti.rate_per_kg,
+               'item_total', ti.item_total
+             )) FILTER (WHERE ti.id IS NOT NULL) as items,
+             json_build_object(
+               'cess_percent', e.cess_percent,
+               'cess_amount', e.cess_amount,
+               'adat_percent', e.adat_percent,
+               'adat_amount', e.adat_amount,
+               'poti_rate', e.poti_rate,
+               'poti_amount', e.poti_amount,
+               'hamali_per_poti', e.hamali_per_poti,
+               'hamali_amount', e.hamali_amount,
+               'packaging_hamali_per_poti', e.packaging_hamali_per_poti,
+               'packaging_hamali_amount', e.packaging_hamali_amount,
+               'gaadi_bharni', e.gaadi_bharni,
+               'other_expenses', e.other_expenses
+             ) as expenses,
+             json_agg(DISTINCT jsonb_build_object(
+               'mode', p.mode,
+               'amount', p.amount,
+               'reference', p.reference
+             )) FILTER (WHERE p.id IS NOT NULL) as payments
+      FROM transactions t
+      LEFT JOIN transaction_items ti ON t.id = ti.transaction_id
+      LEFT JOIN lots l ON ti.lot_id = l.id
+      LEFT JOIN expenses e ON t.id = e.transaction_id
+      LEFT JOIN payments p ON t.id = p.transaction_id
+      WHERE t.id = $1
+      GROUP BY t.id, e.id
+    `, [id]);
+
+        if (result.rows.length === 0) {
+            return res.status(404).json({ success: false, message: 'Transaction not found' });
+        }
+
+        res.json(result.rows[0]);
+    } catch (error) {
+        console.error('Error fetching transaction:', error);
+        res.status(500).json({ success: false, message: error.message });
+    }
+});
+
+// POST create transaction
+router.post('/', async (req, res) => {
+    const client = await pool.connect();
+
+    try {
+        const {
+            id,
+            bill_number,
+            bill_date,
+            bill_type,
+            is_return,
+            party_id,
+            party_name,
+            items,
+            expenses,
+            payments,
+            gross_weight_total,
+            net_weight_total,
+            subtotal,
+            total_expenses,
+            total_amount,
+            paid_amount,
+            balance_amount
+        } = req.body;
+
+        // Validation
+        if (!party_id) {
+            return res.status(400).json({ success: false, message: 'Party is required' });
+        }
+
+        if (!items || items.length === 0) {
+            return res.status(400).json({ success: false, message: 'At least one item is required' });
+        }
+
+        await client.query('BEGIN');
+
+        const transactionId = id || uuidv4();
+
+        console.log('=== BACKEND: SAVING TRANSACTION ===');
+        console.log('Transaction ID:', transactionId);
+        console.log('Items received:', items?.length);
+        console.log('Items data:', JSON.stringify(items, null, 2));
+
+        // 1. Insert transaction
+        const txResult = await client.query(
+            `INSERT INTO transactions (
+        id, bill_number, bill_date, bill_type, is_return, party_id, party_name,
+        gross_weight_total, net_weight_total, subtotal, total_expenses, 
+        total_amount, paid_amount, balance_amount
+      ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14)
+      RETURNING *`,
+            [
+                transactionId, bill_number, bill_date, bill_type, is_return || false,
+                party_id, party_name, gross_weight_total, net_weight_total,
+                subtotal, total_expenses, total_amount, paid_amount, balance_amount
+            ]
+        );
+
+        // 2. Insert transaction items
+        console.log('=== INSERTING ITEMS ===');
+        for (const item of items) {
+            const itemId = item.id || uuidv4();
+            console.log('Inserting item:', itemId, item.mirchi_name);
+            await client.query(
+                `INSERT INTO transaction_items (
+          id, transaction_id, mirchi_type_id, mirchi_name, quality, lot_id,
+          poti_weights, gross_weight, poti_count, total_potya, net_weight,
+          rate_per_kg, item_total
+        ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13)`,
+                [
+                    itemId, transactionId, item.mirchi_type_id, item.mirchi_name,
+                    item.quality, item.lot_id, JSON.stringify(item.poti_weights),
+                    item.gross_weight, item.poti_count, item.total_potya,
+                    item.net_weight, item.rate_per_kg, item.item_total
+                ]
+            );
+        }
+        console.log('=== ITEMS INSERTED ===');
+
+        // 3. Insert expenses
+        if (expenses) {
+            await client.query(
+                `INSERT INTO expenses (
+          transaction_id, cess_percent, cess_amount, adat_percent, adat_amount,
+          poti_rate, poti_amount, hamali_per_poti, hamali_amount,
+          packaging_hamali_per_poti, packaging_hamali_amount, gaadi_bharni, other_expenses
+        ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13)`,
+                [
+                    transactionId, expenses.cess_percent || 0, expenses.cess_amount || 0,
+                    expenses.adat_percent || 0, expenses.adat_amount || 0,
+                    expenses.poti_rate || 0, expenses.poti_amount || 0,
+                    expenses.hamali_per_poti || 0, expenses.hamali_amount || 0,
+                    expenses.packaging_hamali_per_poti || 0, expenses.packaging_hamali_amount || 0,
+                    expenses.gaadi_bharni || 0, expenses.other_expenses || 0
+                ]
+            );
+        }
+
+        // 4. Insert payments
+        if (payments && payments.length > 0) {
+            for (const payment of payments) {
+                if (payment.amount > 0) {
+                    await client.query(
+                        `INSERT INTO payments (transaction_id, mode, amount, reference)
+             VALUES ($1, $2, $3, $4)`,
+                        [transactionId, payment.mode, payment.amount, payment.reference]
+                    );
+                }
+            }
+        }
+
+        // 5. Update party balance
+        if (bill_type === 'jawaak') {
+            // Purchase: We owe them (decrease balance)
+            if (is_return) {
+                await client.query(
+                    'UPDATE parties SET current_balance = current_balance + $1 WHERE id = $2',
+                    [balance_amount, party_id]
+                );
+            } else {
+                await client.query(
+                    'UPDATE parties SET current_balance = current_balance - $1 WHERE id = $2',
+                    [balance_amount, party_id]
+                );
+            }
+        } else {
+            // Sales: They owe us (increase balance)
+            if (is_return) {
+                await client.query(
+                    'UPDATE parties SET current_balance = current_balance - $1 WHERE id = $2',
+                    [balance_amount, party_id]
+                );
+            } else {
+                await client.query(
+                    'UPDATE parties SET current_balance = current_balance + $1 WHERE id = $2',
+                    [balance_amount, party_id]
+                );
+            }
+        }
+
+        // 6. Update lots (stock management)
+        // AWAAK = Purchase (Stock IN), JAWAAK = Sale (Stock OUT)
+        if (bill_type === 'awaak' && !is_return) {
+            // Purchase: Create new lots or update existing ones
+            for (let i = 0; i < items.length; i++) {
+                const item = items[i];
+                const mirchi = await client.query('SELECT name FROM mirchi_types WHERE id = $1', [item.mirchi_type_id]);
+                const mirchiName = mirchi.rows[0]?.name || 'Unknown';
+
+                // Check if lot_number is provided (user-entered or selected existing)
+                if (item.lot_number) {
+                    // Check if lot already exists
+                    const existingLot = await client.query(
+                        'SELECT id FROM lots WHERE lot_number = $1',
+                        [item.lot_number]
+                    );
+
+                    if (existingLot.rows.length > 0) {
+                        // Update existing lot - add stock
+                        const lotId = existingLot.rows[0].id;
+                        await client.query(
+                            `UPDATE lots 
+                             SET total_quantity = total_quantity + $1,
+                                 remaining_quantity = remaining_quantity + $1,
+                                 status = 'active',
+                                 updated_at = CURRENT_TIMESTAMP
+                             WHERE id = $2`,
+                            [item.net_weight, lotId]
+                        );
+
+                        // Update item with lot_id
+                        await client.query(
+                            'UPDATE transaction_items SET lot_id = $1 WHERE id = $2',
+                            [lotId, item.id || uuidv4()]
+                        );
+                    } else {
+                        // Create new lot with user-provided lot_number
+                        const lotId = uuidv4();
+                        await client.query(
+                            `INSERT INTO lots (id, lot_number, mirchi_type_id, mirchi_name, total_quantity, remaining_quantity, purchase_date, status, avg_rate)
+                             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)`,
+                            [lotId, item.lot_number, item.mirchi_type_id, mirchiName, item.net_weight, item.net_weight, bill_date, 'active', item.rate_per_kg]
+                        );
+
+                        // Update item with lot_id
+                        await client.query(
+                            'UPDATE transaction_items SET lot_id = $1 WHERE id = $2',
+                            [lotId, item.id || uuidv4()]
+                        );
+                    }
+                }
+            }
+        } else if (bill_type === 'awaak' && is_return) {
+            // Purchase Return: Reduce stock from lots
+            for (const item of items) {
+                if (item.lot_id) {
+                    await client.query(
+                        `UPDATE lots 
+                         SET total_quantity = total_quantity - $1,
+                             remaining_quantity = remaining_quantity - $1,
+                             status = CASE WHEN remaining_quantity - $1 <= 0 THEN 'sold_out' ELSE 'active' END,
+                             updated_at = CURRENT_TIMESTAMP
+                         WHERE id = $2`,
+                        [item.net_weight, item.lot_id]
+                    );
+                }
+            }
+        } else if (bill_type === 'jawaak' && !is_return) {
+            // Sale: Reduce stock from selected lots using GROSS weight
+            // (NET weight is for billing, GROSS weight is actual physical stock)
+            for (const item of items) {
+                if (item.lot_id) {
+                    await client.query(
+                        `UPDATE lots 
+                         SET remaining_quantity = remaining_quantity - $1,
+                             status = CASE WHEN remaining_quantity - $1 <= 0 THEN 'sold_out' ELSE 'active' END,
+                             updated_at = CURRENT_TIMESTAMP
+                         WHERE id = $2`,
+                        [item.gross_weight, item.lot_id]
+                    );
+                }
+            }
+        } else if (bill_type === 'jawaak' && is_return) {
+            // Sales Return: Add stock back to lots using GROSS weight
+            // (Must match the GROSS weight that was originally deducted)
+            for (const item of items) {
+                if (item.lot_id) {
+                    await client.query(
+                        `UPDATE lots 
+                         SET remaining_quantity = remaining_quantity + $1,
+                             status = CASE WHEN remaining_quantity + $1 > 0 THEN 'active' ELSE status END,
+                             updated_at = CURRENT_TIMESTAMP
+                         WHERE id = $2`,
+                        [item.gross_weight, item.lot_id]
+                    );
+                }
+            }
+        }
+
+        await client.query('COMMIT');
+
+        // Fetch the complete transaction with items, expenses, and payments
+        const completeTransaction = await client.query(`
+            SELECT t.*, 
+                   json_agg(DISTINCT jsonb_build_object(
+                     'id', ti.id,
+                     'mirchi_type_id', ti.mirchi_type_id,
+                     'mirchi_name', ti.mirchi_name,
+                     'quality', ti.quality,
+                     'lot_id', ti.lot_id,
+                     'lot_number', l.lot_number,
+                     'poti_weights', ti.poti_weights,
+                     'gross_weight', ti.gross_weight,
+                     'poti_count', ti.poti_count,
+                     'total_potya', ti.total_potya,
+                     'net_weight', ti.net_weight,
+                     'rate_per_kg', ti.rate_per_kg,
+                     'item_total', ti.item_total
+                   )) FILTER (WHERE ti.id IS NOT NULL) as items,
+                   json_build_object(
+                     'cess_percent', e.cess_percent,
+                     'cess_amount', e.cess_amount,
+                     'adat_percent', e.adat_percent,
+                     'adat_amount', e.adat_amount,
+                     'poti_rate', e.poti_rate,
+                     'poti_amount', e.poti_amount,
+                     'hamali_per_poti', e.hamali_per_poti,
+                     'hamali_amount', e.hamali_amount,
+                     'packaging_hamali_per_poti', e.packaging_hamali_per_poti,
+                     'packaging_hamali_amount', e.packaging_hamali_amount,
+                     'gaadi_bharni', e.gaadi_bharni,
+                     'other_expenses', e.other_expenses
+                   ) as expenses,
+                   json_agg(DISTINCT jsonb_build_object(
+                     'mode', p.mode,
+                     'amount', p.amount,
+                     'reference', p.reference
+                   )) FILTER (WHERE p.id IS NOT NULL) as payments
+            FROM transactions t
+            LEFT JOIN transaction_items ti ON t.id = ti.transaction_id
+            LEFT JOIN lots l ON ti.lot_id = l.id
+            LEFT JOIN expenses e ON t.id = e.transaction_id
+            LEFT JOIN payments p ON t.id = p.transaction_id
+            WHERE t.id = $1
+            GROUP BY t.id, e.id
+        `, [transactionId]);
+
+        res.json({
+            success: true,
+            data: completeTransaction.rows[0],
+            message: 'Transaction saved successfully'
+        });
+
+    } catch (error) {
+        await client.query('ROLLBACK');
+        console.error('Error saving transaction:', error);
+        res.status(500).json({ success: false, message: error.message });
+    } finally {
+        client.release();
+    }
+});
+
+// PATCH update transaction payment
+router.patch('/:id/payment', async (req, res) => {
+    const client = await pool.connect();
+
+    try {
+        const { id } = req.params;
+        const { amount } = req.body;
+
+        if (!amount || amount <= 0) {
+            return res.status(400).json({ success: false, message: 'Amount must be greater than 0' });
+        }
+
+        await client.query('BEGIN');
+
+        // Get transaction
+        const txResult = await client.query(
+            'SELECT * FROM transactions WHERE id = $1',
+            [id]
+        );
+
+        if (txResult.rows.length === 0) {
+            await client.query('ROLLBACK');
+            return res.status(404).json({ success: false, message: 'Transaction not found' });
+        }
+
+        const tx = txResult.rows[0];
+
+        if (amount > tx.balance_amount) {
+            await client.query('ROLLBACK');
+            return res.status(400).json({ success: false, message: 'Amount exceeds due balance' });
+        }
+
+        // Update transaction
+        await client.query(
+            `UPDATE transactions 
+       SET paid_amount = paid_amount + $1, 
+           balance_amount = balance_amount - $1,
+           updated_at = CURRENT_TIMESTAMP
+       WHERE id = $2`,
+            [amount, id]
+        );
+
+        // Add payment record
+        await client.query(
+            `INSERT INTO payments (transaction_id, mode, amount, reference)
+       VALUES ($1, $2, $3, $4)`,
+            [id, 'cash', amount, `Due Payment - ${new Date().toLocaleDateString()}`]
+        );
+
+        // Update party balance
+        if (tx.bill_type === 'awaak') {
+            // Sales: Reduce receivable
+            await client.query(
+                'UPDATE parties SET current_balance = current_balance - $1 WHERE id = $2',
+                [amount, tx.party_id]
+            );
+        } else {
+            // Purchase: Reduce payable
+            await client.query(
+                'UPDATE parties SET current_balance = current_balance + $1 WHERE id = $2',
+                [amount, tx.party_id]
+            );
+        }
+
+        await client.query('COMMIT');
+
+        res.json({
+            success: true,
+            message: 'Payment updated successfully'
+        });
+
+    } catch (error) {
+        await client.query('ROLLBACK');
+        console.error('Error updating payment:', error);
+        res.status(500).json({ success: false, message: error.message });
+    } finally {
+        client.release();
+    }
+});
+
+module.exports = router;

src/server.js

@@ -0,0 +1,73 @@
+const express = require('express');
+const cors = require('cors');
+require('dotenv').config();
+
+const partiesRouter = require('./routes/parties');
+const mirchiTypesRouter = require('./routes/mirchiTypes');
+const lotsRouter = require('./routes/lots');
+const transactionsRouter = require('./routes/transactions');
+
+const app = express();
+const PORT = process.env.PORT || 4000;
+
+// Middleware
+app.use(cors());
+app.use(express.json());
+app.use(express.urlencoded({ extended: true }));
+
+// Request logging
+app.use((req, res, next) => {
+    console.log(`${new Date().toISOString()} - ${req.method} ${req.path}`);
+    next();
+});
+
+// Routes
+app.use('/api/parties', partiesRouter);
+app.use('/api/mirchi-types', mirchiTypesRouter);
+app.use('/api/lots', lotsRouter);
+app.use('/api/transactions', transactionsRouter);
+
+// Health check
+app.get('/health', (req, res) => {
+    res.json({ status: 'ok', timestamp: new Date().toISOString() });
+});
+
+// Root endpoint
+app.get('/', (req, res) => {
+    res.json({
+        message: 'Pattanshetty Inventory Management API',
+        version: '1.0.0',
+        endpoints: {
+            parties: '/api/parties',
+            mirchiTypes: '/api/mirchi-types',
+            lots: '/api/lots',
+            transactions: '/api/transactions'
+        }
+    });
+});
+
+// Error handling middleware
+app.use((err, req, res, next) => {
+    console.error('Error:', err);
+    res.status(500).json({
+        success: false,
+        message: err.message || 'Internal server error'
+    });
+});
+
+// 404 handler
+app.use((req, res) => {
+    res.status(404).json({
+        success: false,
+        message: 'Route not found'
+    });
+});
+
+// Start server
+app.listen(PORT, () => {
+    console.log(`🚀 Server running on port ${PORT}`);
+    console.log(`📍 API available at http://localhost:${PORT}`);
+    console.log(`💚 Health check: http://localhost:${PORT}/health`);
+});
+
+module.exports = app;