702 lines
30 KiB
JavaScript
702 lines
30 KiB
JavaScript
const { outputProgress, formatElapsedTime, estimateRemaining, calculateRate, logError } = require('./utils/progress');
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const { getConnection } = require('./utils/db');
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// Helper function to handle NaN and undefined values
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function sanitizeValue(value) {
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if (value === undefined || value === null || Number.isNaN(value)) {
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return null;
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}
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return value;
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}
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async function calculateProductMetrics(startTime, totalProducts, processedCount = 0, isCancelled = false) {
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const connection = await getConnection();
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let success = false;
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let processedOrders = 0;
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const BATCH_SIZE = 5000;
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try {
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// Skip flags are inherited from the parent scope
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const SKIP_PRODUCT_BASE_METRICS = 0;
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const SKIP_PRODUCT_TIME_AGGREGATES = 0;
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// Get total product count if not provided
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if (!totalProducts) {
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const productCount = await connection.query('SELECT COUNT(*) as count FROM products');
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totalProducts = parseInt(productCount.rows[0].count);
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}
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if (isCancelled) {
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outputProgress({
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status: 'cancelled',
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operation: 'Product metrics calculation cancelled',
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current: processedCount,
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total: totalProducts,
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elapsed: formatElapsedTime(startTime),
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remaining: null,
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rate: calculateRate(startTime, processedCount),
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percentage: ((processedCount / totalProducts) * 100).toFixed(1),
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timing: {
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start_time: new Date(startTime).toISOString(),
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end_time: new Date().toISOString(),
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elapsed_seconds: Math.round((Date.now() - startTime) / 1000)
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}
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});
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return {
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processedProducts: processedCount,
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processedOrders,
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processedPurchaseOrders: 0,
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success
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};
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}
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// First ensure all products have a metrics record
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await connection.query(`
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INSERT INTO product_metrics (pid, last_calculated_at)
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SELECT pid, NOW()
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FROM products
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ON CONFLICT (pid) DO NOTHING
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`);
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// Get threshold settings once
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const thresholds = await connection.query(`
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SELECT critical_days, reorder_days, overstock_days, low_stock_threshold
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FROM stock_thresholds
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WHERE category_id IS NULL AND vendor IS NULL
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LIMIT 1
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`);
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const defaultThresholds = thresholds.rows[0];
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// Calculate base product metrics
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if (!SKIP_PRODUCT_BASE_METRICS) {
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outputProgress({
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status: 'running',
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operation: 'Starting base product metrics calculation',
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current: processedCount,
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total: totalProducts,
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elapsed: formatElapsedTime(startTime),
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remaining: estimateRemaining(startTime, processedCount, totalProducts),
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rate: calculateRate(startTime, processedCount),
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percentage: ((processedCount / totalProducts) * 100).toFixed(1),
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timing: {
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start_time: new Date(startTime).toISOString(),
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end_time: new Date().toISOString(),
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elapsed_seconds: Math.round((Date.now() - startTime) / 1000)
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}
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});
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// Get order count that will be processed
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const orderCount = await connection.query(`
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SELECT COUNT(*) as count
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FROM orders o
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WHERE o.canceled = false
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`);
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processedOrders = parseInt(orderCount.rows[0].count);
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// Clear temporary tables
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await connection.query('DROP TABLE IF EXISTS temp_sales_metrics');
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await connection.query('DROP TABLE IF EXISTS temp_purchase_metrics');
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// Create temp_sales_metrics
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await connection.query(`
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CREATE TEMPORARY TABLE temp_sales_metrics (
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pid BIGINT NOT NULL,
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daily_sales_avg DECIMAL(10,3),
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weekly_sales_avg DECIMAL(10,3),
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monthly_sales_avg DECIMAL(10,3),
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total_revenue DECIMAL(10,3),
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avg_margin_percent DECIMAL(10,3),
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first_sale_date DATE,
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last_sale_date DATE,
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PRIMARY KEY (pid)
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)
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`);
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// Create temp_purchase_metrics
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await connection.query(`
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CREATE TEMPORARY TABLE temp_purchase_metrics (
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pid BIGINT NOT NULL,
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avg_lead_time_days DOUBLE PRECISION,
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last_purchase_date DATE,
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first_received_date DATE,
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last_received_date DATE,
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PRIMARY KEY (pid)
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)
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`);
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// Populate temp_sales_metrics with base stats and sales averages
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await connection.query(`
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INSERT INTO temp_sales_metrics
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SELECT
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p.pid,
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COALESCE(SUM(o.quantity) / NULLIF(COUNT(DISTINCT DATE(o.date)), 0), 0) as daily_sales_avg,
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COALESCE(SUM(o.quantity) / NULLIF(CEIL(COUNT(DISTINCT DATE(o.date)) / 7), 0), 0) as weekly_sales_avg,
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COALESCE(SUM(o.quantity) / NULLIF(CEIL(COUNT(DISTINCT DATE(o.date)) / 30), 0), 0) as monthly_sales_avg,
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COALESCE(SUM(o.quantity * o.price), 0) as total_revenue,
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CASE
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WHEN SUM(o.quantity * o.price) > 0
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THEN ((SUM(o.quantity * o.price) - SUM(o.quantity * p.cost_price)) / SUM(o.quantity * o.price)) * 100
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ELSE 0
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END as avg_margin_percent,
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MIN(o.date) as first_sale_date,
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MAX(o.date) as last_sale_date
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FROM products p
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LEFT JOIN orders o ON p.pid = o.pid
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AND o.canceled = false
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AND o.date >= CURRENT_DATE - INTERVAL '90 days'
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GROUP BY p.pid
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`);
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// Populate temp_purchase_metrics
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await connection.query(`
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INSERT INTO temp_purchase_metrics
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SELECT
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p.pid,
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AVG(
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CASE
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WHEN po.received_date IS NOT NULL AND po.date IS NOT NULL
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THEN EXTRACT(EPOCH FROM (po.received_date::timestamp with time zone - po.date::timestamp with time zone)) / 86400.0
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ELSE NULL
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END
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) as avg_lead_time_days,
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MAX(po.date) as last_purchase_date,
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MIN(po.received_date) as first_received_date,
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MAX(po.received_date) as last_received_date
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FROM products p
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LEFT JOIN purchase_orders po ON p.pid = po.pid
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AND po.received_date IS NOT NULL
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AND po.date >= CURRENT_DATE - INTERVAL '365 days'
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GROUP BY p.pid
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`);
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// Process updates in batches
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let lastPid = 0;
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while (true) {
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if (isCancelled) break;
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const batch = await connection.query(
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'SELECT pid FROM products WHERE pid > $1 ORDER BY pid LIMIT $2',
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[lastPid, BATCH_SIZE]
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);
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if (batch.rows.length === 0) break;
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await connection.query(`
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UPDATE product_metrics pm
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SET
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inventory_value = p.stock_quantity * NULLIF(p.cost_price, 0),
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daily_sales_avg = COALESCE(sm.daily_sales_avg, 0),
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weekly_sales_avg = COALESCE(sm.weekly_sales_avg, 0),
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monthly_sales_avg = COALESCE(sm.monthly_sales_avg, 0),
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total_revenue = COALESCE(sm.total_revenue, 0),
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avg_margin_percent = COALESCE(sm.avg_margin_percent, 0),
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first_sale_date = sm.first_sale_date,
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last_sale_date = sm.last_sale_date,
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avg_lead_time_days = COALESCE(lm.avg_lead_time_days, 30),
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days_of_inventory = CASE
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WHEN COALESCE(sm.daily_sales_avg, 0) > 0
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THEN FLOOR(p.stock_quantity / NULLIF(sm.daily_sales_avg, 0))
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ELSE NULL
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END,
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weeks_of_inventory = CASE
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WHEN COALESCE(sm.weekly_sales_avg, 0) > 0
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THEN FLOOR(p.stock_quantity / NULLIF(sm.weekly_sales_avg, 0))
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ELSE NULL
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END,
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stock_status = CASE
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WHEN p.stock_quantity <= 0 THEN 'Out of Stock'
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WHEN COALESCE(sm.daily_sales_avg, 0) = 0 AND p.stock_quantity <= $1 THEN 'Low Stock'
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WHEN COALESCE(sm.daily_sales_avg, 0) = 0 THEN 'In Stock'
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WHEN p.stock_quantity / NULLIF(sm.daily_sales_avg, 0) <= $2 THEN 'Critical'
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WHEN p.stock_quantity / NULLIF(sm.daily_sales_avg, 0) <= $3 THEN 'Reorder'
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WHEN p.stock_quantity / NULLIF(sm.daily_sales_avg, 0) > $4 THEN 'Overstocked'
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ELSE 'Healthy'
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END,
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safety_stock = CASE
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WHEN COALESCE(sm.daily_sales_avg, 0) > 0 THEN
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CEIL(sm.daily_sales_avg * SQRT(ABS(COALESCE(lm.avg_lead_time_days, 30))) * 1.96)
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ELSE $5
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END,
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reorder_point = CASE
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WHEN COALESCE(sm.daily_sales_avg, 0) > 0 THEN
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CEIL(sm.daily_sales_avg * COALESCE(lm.avg_lead_time_days, 30)) +
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CEIL(sm.daily_sales_avg * SQRT(ABS(COALESCE(lm.avg_lead_time_days, 30))) * 1.96)
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ELSE $6
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END,
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reorder_qty = CASE
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WHEN COALESCE(sm.daily_sales_avg, 0) > 0 AND NULLIF(p.cost_price, 0) IS NOT NULL AND NULLIF(p.cost_price, 0) > 0 THEN
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GREATEST(
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CEIL(SQRT(ABS((2 * (sm.daily_sales_avg * 365) * 25) / (NULLIF(p.cost_price, 0) * 0.25)))),
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$7
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)
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ELSE $8
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END,
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overstocked_amt = CASE
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WHEN p.stock_quantity / NULLIF(sm.daily_sales_avg, 0) > $9
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THEN GREATEST(0, p.stock_quantity - CEIL(sm.daily_sales_avg * $10))
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ELSE 0
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END,
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last_calculated_at = NOW()
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FROM products p
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LEFT JOIN temp_sales_metrics sm ON p.pid = sm.pid
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LEFT JOIN temp_purchase_metrics lm ON p.pid = lm.pid
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WHERE p.pid = ANY($11::bigint[])
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`,
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[
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defaultThresholds.low_stock_threshold,
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defaultThresholds.critical_days,
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defaultThresholds.reorder_days,
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defaultThresholds.overstock_days,
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defaultThresholds.low_stock_threshold,
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defaultThresholds.low_stock_threshold,
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defaultThresholds.low_stock_threshold,
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defaultThresholds.low_stock_threshold,
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defaultThresholds.overstock_days,
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defaultThresholds.overstock_days,
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batch.rows.map(row => row.pid)
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]
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);
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lastPid = batch.rows[batch.rows.length - 1].pid;
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processedCount += batch.rows.length;
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outputProgress({
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status: 'running',
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operation: 'Processing base metrics batch',
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current: processedCount,
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total: totalProducts,
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elapsed: formatElapsedTime(startTime),
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remaining: estimateRemaining(startTime, processedCount, totalProducts),
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rate: calculateRate(startTime, processedCount),
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percentage: ((processedCount / totalProducts) * 100).toFixed(1),
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timing: {
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start_time: new Date(startTime).toISOString(),
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end_time: new Date().toISOString(),
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elapsed_seconds: Math.round((Date.now() - startTime) / 1000)
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}
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});
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}
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// Calculate forecast accuracy and bias in batches
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lastPid = 0;
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while (true) {
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if (isCancelled) break;
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const batch = await connection.query(
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'SELECT pid FROM products WHERE pid > $1 ORDER BY pid LIMIT $2',
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[lastPid, BATCH_SIZE]
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);
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if (batch.rows.length === 0) break;
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await connection.query(`
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UPDATE product_metrics pm
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SET
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forecast_accuracy = GREATEST(0, 100 - LEAST(fa.avg_forecast_error, 100)),
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forecast_bias = GREATEST(-100, LEAST(fa.avg_forecast_bias, 100)),
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last_forecast_date = fa.last_forecast_date,
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last_calculated_at = NOW()
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FROM (
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SELECT
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sf.pid,
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AVG(CASE
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WHEN o.quantity > 0
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THEN ABS(sf.forecast_quantity - o.quantity) / o.quantity * 100
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ELSE 100
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END) as avg_forecast_error,
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AVG(CASE
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WHEN o.quantity > 0
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THEN (sf.forecast_quantity - o.quantity) / o.quantity * 100
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ELSE 0
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END) as avg_forecast_bias,
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MAX(sf.forecast_date) as last_forecast_date
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FROM sales_forecasts sf
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JOIN orders o ON sf.pid = o.pid
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AND DATE(o.date) = sf.forecast_date
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WHERE o.canceled = false
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AND sf.forecast_date >= CURRENT_DATE - INTERVAL '90 days'
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AND sf.pid = ANY($1::bigint[])
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GROUP BY sf.pid
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) fa
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WHERE pm.pid = fa.pid
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`, [batch.rows.map(row => row.pid)]);
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lastPid = batch.rows[batch.rows.length - 1].pid;
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}
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}
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// Calculate product time aggregates
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if (!SKIP_PRODUCT_TIME_AGGREGATES) {
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outputProgress({
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status: 'running',
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operation: 'Starting product time aggregates calculation',
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current: processedCount || 0,
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total: totalProducts || 0,
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elapsed: formatElapsedTime(startTime),
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remaining: estimateRemaining(startTime, processedCount || 0, totalProducts || 0),
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rate: calculateRate(startTime, processedCount || 0),
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percentage: (((processedCount || 0) / (totalProducts || 1)) * 100).toFixed(1),
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timing: {
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start_time: new Date(startTime).toISOString(),
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end_time: new Date().toISOString(),
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elapsed_seconds: Math.round((Date.now() - startTime) / 1000)
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}
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});
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// Calculate time-based aggregates
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await connection.query(`
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INSERT INTO product_time_aggregates (
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pid,
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year,
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month,
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total_quantity_sold,
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total_revenue,
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total_cost,
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order_count,
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avg_price,
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profit_margin,
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inventory_value,
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gmroi
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)
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SELECT
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p.pid,
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EXTRACT(YEAR FROM o.date) as year,
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EXTRACT(MONTH FROM o.date) as month,
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SUM(o.quantity) as total_quantity_sold,
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SUM(o.quantity * o.price) as total_revenue,
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SUM(o.quantity * p.cost_price) as total_cost,
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COUNT(DISTINCT o.order_number) as order_count,
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AVG(o.price) as avg_price,
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CASE
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WHEN SUM(o.quantity * o.price) > 0
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THEN ((SUM(o.quantity * o.price) - SUM(o.quantity * p.cost_price)) / SUM(o.quantity * o.price)) * 100
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ELSE 0
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END as profit_margin,
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p.cost_price * p.stock_quantity as inventory_value,
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CASE
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WHEN p.cost_price * p.stock_quantity > 0
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THEN (SUM(o.quantity * (o.price - p.cost_price))) / (p.cost_price * p.stock_quantity)
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ELSE 0
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END as gmroi
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FROM products p
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LEFT JOIN orders o ON p.pid = o.pid AND o.canceled = false
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WHERE o.date >= CURRENT_DATE - INTERVAL '12 months'
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GROUP BY p.pid, EXTRACT(YEAR FROM o.date), EXTRACT(MONTH FROM o.date)
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ON CONFLICT (pid, year, month) DO UPDATE
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SET
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total_quantity_sold = EXCLUDED.total_quantity_sold,
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total_revenue = EXCLUDED.total_revenue,
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total_cost = EXCLUDED.total_cost,
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order_count = EXCLUDED.order_count,
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avg_price = EXCLUDED.avg_price,
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profit_margin = EXCLUDED.profit_margin,
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inventory_value = EXCLUDED.inventory_value,
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gmroi = EXCLUDED.gmroi
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`);
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processedCount = Math.floor(totalProducts * 0.6);
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outputProgress({
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status: 'running',
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operation: 'Product time aggregates calculated',
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current: processedCount || 0,
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total: totalProducts || 0,
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elapsed: formatElapsedTime(startTime),
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remaining: estimateRemaining(startTime, processedCount || 0, totalProducts || 0),
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rate: calculateRate(startTime, processedCount || 0),
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percentage: (((processedCount || 0) / (totalProducts || 1)) * 100).toFixed(1),
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timing: {
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start_time: new Date(startTime).toISOString(),
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end_time: new Date().toISOString(),
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elapsed_seconds: Math.round((Date.now() - startTime) / 1000)
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}
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});
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} else {
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processedCount = Math.floor(totalProducts * 0.6);
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outputProgress({
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status: 'running',
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operation: 'Skipping product time aggregates calculation',
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current: processedCount || 0,
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total: totalProducts || 0,
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elapsed: formatElapsedTime(startTime),
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remaining: estimateRemaining(startTime, processedCount || 0, totalProducts || 0),
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rate: calculateRate(startTime, processedCount || 0),
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percentage: (((processedCount || 0) / (totalProducts || 1)) * 100).toFixed(1),
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timing: {
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start_time: new Date(startTime).toISOString(),
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end_time: new Date().toISOString(),
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elapsed_seconds: Math.round((Date.now() - startTime) / 1000)
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}
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});
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}
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// Calculate ABC classification
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outputProgress({
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status: 'running',
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operation: 'Starting ABC classification',
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current: processedCount,
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total: totalProducts,
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elapsed: formatElapsedTime(startTime),
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remaining: estimateRemaining(startTime, processedCount, totalProducts),
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rate: calculateRate(startTime, processedCount),
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percentage: ((processedCount / totalProducts) * 100).toFixed(1),
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timing: {
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start_time: new Date(startTime).toISOString(),
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end_time: new Date().toISOString(),
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elapsed_seconds: Math.round((Date.now() - startTime) / 1000)
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}
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});
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if (isCancelled) return {
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processedProducts: processedCount,
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processedOrders,
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processedPurchaseOrders: 0, // This module doesn't process POs
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success
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};
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const abcConfig = await connection.query('SELECT a_threshold, b_threshold FROM abc_classification_config WHERE id = 1');
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const abcThresholds = abcConfig.rows[0] || { a_threshold: 20, b_threshold: 50 };
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// First, create and populate the rankings table with an index
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await connection.query('DROP TABLE IF EXISTS temp_revenue_ranks');
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await connection.query(`
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CREATE TEMPORARY TABLE temp_revenue_ranks (
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pid BIGINT NOT NULL,
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total_revenue DECIMAL(10,3),
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rank_num INT,
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dense_rank_num INT,
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percentile DECIMAL(5,2),
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total_count INT,
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PRIMARY KEY (pid)
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)
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`);
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await connection.query('CREATE INDEX ON temp_revenue_ranks (rank_num)');
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|
await connection.query('CREATE INDEX ON temp_revenue_ranks (dense_rank_num)');
|
|
await connection.query('CREATE INDEX ON temp_revenue_ranks (percentile)');
|
|
|
|
// Calculate rankings with proper tie handling
|
|
await connection.query(`
|
|
INSERT INTO temp_revenue_ranks
|
|
WITH revenue_data AS (
|
|
SELECT
|
|
pid,
|
|
total_revenue,
|
|
COUNT(*) OVER () as total_count,
|
|
PERCENT_RANK() OVER (ORDER BY total_revenue DESC) * 100 as percentile,
|
|
RANK() OVER (ORDER BY total_revenue DESC) as rank_num,
|
|
DENSE_RANK() OVER (ORDER BY total_revenue DESC) as dense_rank_num
|
|
FROM product_metrics
|
|
WHERE total_revenue > 0
|
|
)
|
|
SELECT
|
|
pid,
|
|
total_revenue,
|
|
rank_num,
|
|
dense_rank_num,
|
|
percentile,
|
|
total_count
|
|
FROM revenue_data
|
|
`);
|
|
|
|
// Get total count for percentage calculation
|
|
const rankingCount = await connection.query('SELECT MAX(rank_num) as total_count FROM temp_revenue_ranks');
|
|
const totalCount = parseInt(rankingCount.rows[0].total_count) || 1;
|
|
const max_rank = totalCount;
|
|
|
|
// Process updates in batches
|
|
let abcProcessedCount = 0;
|
|
const batchSize = 5000;
|
|
|
|
while (true) {
|
|
if (isCancelled) return {
|
|
processedProducts: processedCount,
|
|
processedOrders,
|
|
processedPurchaseOrders: 0, // This module doesn't process POs
|
|
success
|
|
};
|
|
|
|
// Get a batch of PIDs that need updating
|
|
const pids = await connection.query(`
|
|
SELECT pm.pid
|
|
FROM product_metrics pm
|
|
LEFT JOIN temp_revenue_ranks tr ON pm.pid = tr.pid
|
|
WHERE pm.abc_class IS NULL
|
|
OR pm.abc_class !=
|
|
CASE
|
|
WHEN tr.pid IS NULL THEN 'C'
|
|
WHEN tr.percentile <= $1 THEN 'A'
|
|
WHEN tr.percentile <= $2 THEN 'B'
|
|
ELSE 'C'
|
|
END
|
|
LIMIT $3
|
|
`, [abcThresholds.a_threshold, abcThresholds.b_threshold, batchSize]);
|
|
|
|
if (pids.rows.length === 0) break;
|
|
|
|
const pidValues = pids.rows.map(row => row.pid);
|
|
|
|
await connection.query(`
|
|
UPDATE product_metrics pm
|
|
SET abc_class =
|
|
CASE
|
|
WHEN tr.pid IS NULL THEN 'C'
|
|
WHEN tr.percentile <= $1 THEN 'A'
|
|
WHEN tr.percentile <= $2 THEN 'B'
|
|
ELSE 'C'
|
|
END,
|
|
last_calculated_at = NOW()
|
|
FROM (SELECT pid, percentile FROM temp_revenue_ranks) tr
|
|
WHERE pm.pid = tr.pid AND pm.pid = ANY($3::bigint[])
|
|
OR (pm.pid = ANY($3::bigint[]) AND tr.pid IS NULL)
|
|
`, [abcThresholds.a_threshold, abcThresholds.b_threshold, pidValues]);
|
|
|
|
// Now update turnover rate with proper handling of zero inventory periods
|
|
await connection.query(`
|
|
UPDATE product_metrics pm
|
|
SET
|
|
turnover_rate = CASE
|
|
WHEN sales.avg_nonzero_stock > 0 AND sales.active_days > 0
|
|
THEN LEAST(
|
|
(sales.total_sold / sales.avg_nonzero_stock) * (365.0 / sales.active_days),
|
|
999.99
|
|
)
|
|
ELSE 0
|
|
END,
|
|
last_calculated_at = NOW()
|
|
FROM (
|
|
SELECT
|
|
o.pid,
|
|
SUM(o.quantity) as total_sold,
|
|
COUNT(DISTINCT DATE(o.date)) as active_days,
|
|
AVG(CASE
|
|
WHEN p.stock_quantity > 0 THEN p.stock_quantity
|
|
ELSE NULL
|
|
END) as avg_nonzero_stock
|
|
FROM orders o
|
|
JOIN products p ON o.pid = p.pid
|
|
WHERE o.canceled = false
|
|
AND o.date >= CURRENT_DATE - INTERVAL '90 days'
|
|
AND o.pid = ANY($1::bigint[])
|
|
GROUP BY o.pid
|
|
) sales
|
|
WHERE pm.pid = sales.pid
|
|
`, [pidValues]);
|
|
|
|
abcProcessedCount += pids.rows.length;
|
|
|
|
// Calculate progress proportionally to batch size
|
|
processedCount = Math.floor(totalProducts * (0.60 + (abcProcessedCount / totalProducts) * 0.2));
|
|
|
|
outputProgress({
|
|
status: 'running',
|
|
operation: 'ABC classification progress',
|
|
current: processedCount,
|
|
total: totalProducts,
|
|
elapsed: formatElapsedTime(startTime),
|
|
remaining: estimateRemaining(startTime, processedCount, totalProducts),
|
|
rate: calculateRate(startTime, processedCount),
|
|
percentage: ((processedCount / totalProducts) * 100).toFixed(1),
|
|
timing: {
|
|
start_time: new Date(startTime).toISOString(),
|
|
end_time: new Date().toISOString(),
|
|
elapsed_seconds: Math.round((Date.now() - startTime) / 1000)
|
|
}
|
|
});
|
|
}
|
|
|
|
// If we get here, everything completed successfully
|
|
success = true;
|
|
|
|
// Update calculate_status
|
|
await connection.query(`
|
|
INSERT INTO calculate_status (module_name, last_calculation_timestamp)
|
|
VALUES ('product_metrics', NOW())
|
|
ON CONFLICT (module_name) DO UPDATE
|
|
SET last_calculation_timestamp = NOW()
|
|
`);
|
|
|
|
return {
|
|
processedProducts: processedCount || 0,
|
|
processedOrders: processedOrders || 0,
|
|
processedPurchaseOrders: 0, // This module doesn't process POs
|
|
success
|
|
};
|
|
|
|
} catch (error) {
|
|
success = false;
|
|
logError(error, 'Error calculating product metrics');
|
|
throw error;
|
|
} finally {
|
|
if (connection) {
|
|
connection.release();
|
|
}
|
|
}
|
|
}
|
|
|
|
function calculateStockStatus(stock, config, daily_sales_avg, weekly_sales_avg, monthly_sales_avg) {
|
|
if (stock <= 0) {
|
|
return 'Out of Stock';
|
|
}
|
|
|
|
// Use the most appropriate sales average based on data quality
|
|
let sales_avg = daily_sales_avg;
|
|
if (sales_avg === 0) {
|
|
sales_avg = weekly_sales_avg / 7;
|
|
}
|
|
if (sales_avg === 0) {
|
|
sales_avg = monthly_sales_avg / 30;
|
|
}
|
|
|
|
if (sales_avg === 0) {
|
|
return stock <= config.low_stock_threshold ? 'Low Stock' : 'In Stock';
|
|
}
|
|
|
|
const days_of_stock = stock / sales_avg;
|
|
|
|
if (days_of_stock <= config.critical_days) {
|
|
return 'Critical';
|
|
} else if (days_of_stock <= config.reorder_days) {
|
|
return 'Reorder';
|
|
} else if (days_of_stock > config.overstock_days) {
|
|
return 'Overstocked';
|
|
}
|
|
|
|
return 'Healthy';
|
|
}
|
|
|
|
function calculateReorderQuantities(stock, stock_status, daily_sales_avg, avg_lead_time, config) {
|
|
// Calculate safety stock based on service level and lead time
|
|
const z_score = 1.96; // 95% service level
|
|
const lead_time = avg_lead_time || config.target_days;
|
|
const safety_stock = Math.ceil(daily_sales_avg * Math.sqrt(lead_time) * z_score);
|
|
|
|
// Calculate reorder point
|
|
const lead_time_demand = daily_sales_avg * lead_time;
|
|
const reorder_point = Math.ceil(lead_time_demand + safety_stock);
|
|
|
|
// Calculate reorder quantity using EOQ formula if we have the necessary data
|
|
let reorder_qty = 0;
|
|
if (daily_sales_avg > 0) {
|
|
const annual_demand = daily_sales_avg * 365;
|
|
const order_cost = 25; // Fixed cost per order
|
|
const holding_cost = config.cost_price * 0.25; // 25% of unit cost as annual holding cost
|
|
|
|
reorder_qty = Math.ceil(Math.sqrt((2 * annual_demand * order_cost) / holding_cost));
|
|
} else {
|
|
// If no sales data, use a basic calculation
|
|
reorder_qty = Math.max(safety_stock, config.low_stock_threshold);
|
|
}
|
|
|
|
// Calculate overstocked amount
|
|
const overstocked_amt = stock_status === 'Overstocked' ?
|
|
stock - Math.ceil(daily_sales_avg * config.overstock_days) :
|
|
0;
|
|
|
|
return {
|
|
safety_stock,
|
|
reorder_point,
|
|
reorder_qty,
|
|
overstocked_amt
|
|
};
|
|
}
|
|
|
|
module.exports = calculateProductMetrics;
|