Improve and debug calculate metrics script

inventory-server/db/metrics-schema.sql

@@ -30,6 +30,10 @@ CREATE TABLE IF NOT EXISTS product_metrics (
     daily_sales_avg DECIMAL(10,3),
     weekly_sales_avg DECIMAL(10,3),
     monthly_sales_avg DECIMAL(10,3),
+    avg_quantity_per_order DECIMAL(10,3),
+    number_of_orders INT,
+    first_sale_date DATE,
+    last_sale_date DATE,
     -- Stock metrics
     days_of_inventory INT,
     weeks_of_inventory INT,
@@ -38,6 +42,7 @@ CREATE TABLE IF NOT EXISTS product_metrics (
     -- Financial metrics
     avg_margin_percent DECIMAL(10,3),
     total_revenue DECIMAL(10,3),
+    inventory_value DECIMAL(10,3),
     -- Purchase metrics
     avg_lead_time_days INT,
     last_purchase_date DATE,
@@ -46,7 +51,8 @@ CREATE TABLE IF NOT EXISTS product_metrics (
     abc_class CHAR(1),
     stock_status VARCHAR(20),
     PRIMARY KEY (product_id),
-    FOREIGN KEY (product_id) REFERENCES products(product_id) ON DELETE CASCADE
+    FOREIGN KEY (product_id) REFERENCES products(product_id) ON DELETE CASCADE,
+    INDEX idx_metrics_revenue (total_revenue)
 );
 
 -- New table for time-based aggregates
@@ -82,11 +88,103 @@ CREATE TABLE IF NOT EXISTS vendor_metrics (
     PRIMARY KEY (vendor)
 );
 
+-- New table for stock threshold configurations
+CREATE TABLE IF NOT EXISTS stock_thresholds (
+    id INT NOT NULL,  -- Changed from AUTO_INCREMENT to explicitly set ID
+    category_id BIGINT,  -- NULL means default/global threshold
+    vendor VARCHAR(100), -- NULL means applies to all vendors
+    critical_days INT NOT NULL DEFAULT 7,
+    reorder_days INT NOT NULL DEFAULT 14,
+    overstock_days INT NOT NULL DEFAULT 90,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    PRIMARY KEY (id),
+    FOREIGN KEY (category_id) REFERENCES categories(id) ON DELETE CASCADE,
+    UNIQUE KEY unique_category_vendor (category_id, vendor),
+    INDEX idx_thresholds_category_vendor (category_id, vendor)
+);
+
+-- Insert default thresholds with ID=1
+INSERT INTO stock_thresholds (id, category_id, vendor, critical_days, reorder_days, overstock_days)
+VALUES (1, NULL, NULL, 7, 14, 90)
+ON DUPLICATE KEY UPDATE
+    critical_days = VALUES(critical_days),
+    reorder_days = VALUES(reorder_days),
+    overstock_days = VALUES(overstock_days);
+
 -- Re-enable foreign key checks
 SET FOREIGN_KEY_CHECKS = 1;
 
 -- Create view for inventory health (after all tables are created)
 CREATE OR REPLACE VIEW inventory_health AS
+WITH product_thresholds AS (
+    SELECT 
+        p.product_id,
+        COALESCE(
+            -- Try category+vendor specific
+            (SELECT critical_days FROM stock_thresholds st 
+            JOIN product_categories pc ON st.category_id = pc.category_id
+            WHERE pc.product_id = p.product_id 
+            AND st.vendor = p.vendor LIMIT 1),
+            -- Try category specific
+            (SELECT critical_days FROM stock_thresholds st 
+            JOIN product_categories pc ON st.category_id = pc.category_id
+            WHERE pc.product_id = p.product_id 
+            AND st.vendor IS NULL LIMIT 1),
+            -- Try vendor specific
+            (SELECT critical_days FROM stock_thresholds st 
+            WHERE st.category_id IS NULL 
+            AND st.vendor = p.vendor LIMIT 1),
+            -- Fall back to default
+            (SELECT critical_days FROM stock_thresholds st 
+            WHERE st.category_id IS NULL 
+            AND st.vendor IS NULL LIMIT 1),
+            7
+        ) as critical_days,
+        COALESCE(
+            -- Try category+vendor specific
+            (SELECT reorder_days FROM stock_thresholds st 
+            JOIN product_categories pc ON st.category_id = pc.category_id
+            WHERE pc.product_id = p.product_id 
+            AND st.vendor = p.vendor LIMIT 1),
+            -- Try category specific
+            (SELECT reorder_days FROM stock_thresholds st 
+            JOIN product_categories pc ON st.category_id = pc.category_id
+            WHERE pc.product_id = p.product_id 
+            AND st.vendor IS NULL LIMIT 1),
+            -- Try vendor specific
+            (SELECT reorder_days FROM stock_thresholds st 
+            WHERE st.category_id IS NULL 
+            AND st.vendor = p.vendor LIMIT 1),
+            -- Fall back to default
+            (SELECT reorder_days FROM stock_thresholds st 
+            WHERE st.category_id IS NULL 
+            AND st.vendor IS NULL LIMIT 1),
+            14
+        ) as reorder_days,
+        COALESCE(
+            -- Try category+vendor specific
+            (SELECT overstock_days FROM stock_thresholds st 
+            JOIN product_categories pc ON st.category_id = pc.category_id
+            WHERE pc.product_id = p.product_id 
+            AND st.vendor = p.vendor LIMIT 1),
+            -- Try category specific
+            (SELECT overstock_days FROM stock_thresholds st 
+            JOIN product_categories pc ON st.category_id = pc.category_id
+            WHERE pc.product_id = p.product_id 
+            AND st.vendor IS NULL LIMIT 1),
+            -- Try vendor specific
+            (SELECT overstock_days FROM stock_thresholds st 
+            WHERE st.category_id IS NULL 
+            AND st.vendor = p.vendor LIMIT 1),
+            -- Fall back to default
+            (SELECT overstock_days FROM stock_thresholds st 
+            WHERE st.category_id IS NULL 
+            AND st.vendor IS NULL LIMIT 1),
+            90
+        ) as overstock_days
+    FROM products p
+)
 SELECT 
     p.product_id,
     p.SKU,
@@ -97,15 +195,18 @@ SELECT
     COALESCE(pm.reorder_point, 0) as reorder_point,
     COALESCE(pm.safety_stock, 0) as safety_stock,
     CASE 
-        WHEN p.stock_quantity <= COALESCE(pm.safety_stock, 0) THEN 'Critical'
-        WHEN p.stock_quantity <= COALESCE(pm.reorder_point, 0) THEN 'Reorder'
-        WHEN p.stock_quantity > (COALESCE(pm.daily_sales_avg, 0) * 90) THEN 'Overstocked'
+        WHEN pm.daily_sales_avg = 0 THEN 'New'
+        WHEN p.stock_quantity <= CEIL(pm.daily_sales_avg * pt.critical_days) THEN 'Critical'
+        WHEN p.stock_quantity <= CEIL(pm.daily_sales_avg * pt.reorder_days) THEN 'Reorder'
+        WHEN p.stock_quantity > (pm.daily_sales_avg * pt.overstock_days) THEN 'Overstocked'
         ELSE 'Healthy'
     END as stock_status
 FROM 
     products p
 LEFT JOIN 
     product_metrics pm ON p.product_id = pm.product_id
+LEFT JOIN
+    product_thresholds pt ON p.product_id = pt.product_id
 WHERE 
     p.managing_stock = true;