Add more tables to db and processing to import script, add error logging to import, add test data snapshots (untested)

inventory-server/db/schema.sql

@@ -30,6 +30,67 @@ CREATE TABLE IF NOT EXISTS products (
     INDEX idx_brand (brand)
 );
 
+-- New table for product metrics
+CREATE TABLE IF NOT EXISTS product_metrics (
+    product_id BIGINT NOT NULL,
+    last_calculated_at TIMESTAMP NOT NULL,
+    -- Sales velocity metrics
+    daily_sales_avg DECIMAL(10,3),
+    weekly_sales_avg DECIMAL(10,3),
+    monthly_sales_avg DECIMAL(10,3),
+    -- Stock metrics
+    days_of_inventory INT,
+    weeks_of_inventory INT,
+    reorder_point INT,
+    safety_stock INT,
+    -- Financial metrics
+    avg_margin_percent DECIMAL(10,3),
+    total_revenue DECIMAL(10,3),
+    -- Purchase metrics
+    avg_lead_time_days INT,
+    last_purchase_date DATE,
+    last_received_date DATE,
+    -- Classification
+    abc_class CHAR(1),
+    stock_status VARCHAR(20),
+    PRIMARY KEY (product_id),
+    FOREIGN KEY (product_id) REFERENCES products(product_id) ON DELETE CASCADE
+);
+
+-- New table for time-based aggregates
+CREATE TABLE IF NOT EXISTS product_time_aggregates (
+    product_id BIGINT NOT NULL,
+    year INT NOT NULL,
+    month INT NOT NULL,
+    -- Sales metrics
+    total_quantity_sold INT DEFAULT 0,
+    total_revenue DECIMAL(10,3) DEFAULT 0,
+    total_cost DECIMAL(10,3) DEFAULT 0,
+    order_count INT DEFAULT 0,
+    -- Stock changes
+    stock_received INT DEFAULT 0,
+    stock_ordered INT DEFAULT 0,
+    -- Calculated fields
+    avg_price DECIMAL(10,3),
+    profit_margin DECIMAL(10,3),
+    PRIMARY KEY (product_id, year, month),
+    FOREIGN KEY (product_id) REFERENCES products(product_id) ON DELETE CASCADE,
+    INDEX idx_date (year, month)
+);
+
+-- New table for vendor performance
+CREATE TABLE IF NOT EXISTS vendor_metrics (
+    vendor VARCHAR(100) NOT NULL,
+    last_calculated_at TIMESTAMP NOT NULL,
+    avg_lead_time_days DECIMAL(10,3),
+    on_time_delivery_rate DECIMAL(5,2),
+    order_fill_rate DECIMAL(5,2),
+    total_orders INT,
+    total_late_orders INT,
+    PRIMARY KEY (vendor),
+    FOREIGN KEY (vendor) REFERENCES products(vendor) ON DELETE CASCADE
+);
+
 CREATE TABLE IF NOT EXISTS orders (
     id BIGINT AUTO_INCREMENT PRIMARY KEY,
     order_number VARCHAR(50) NOT NULL,
@@ -97,4 +158,48 @@ CREATE TABLE IF NOT EXISTS product_categories (
     FOREIGN KEY (category_id) REFERENCES categories(id) ON DELETE CASCADE,
     INDEX idx_category (category_id),
     INDEX idx_product (product_id)
-); 
+);
+
+-- Create views for common calculations
+CREATE OR REPLACE VIEW product_sales_trends AS
+SELECT 
+    p.product_id,
+    p.SKU,
+    p.title,
+    COALESCE(SUM(o.quantity), 0) as total_sold,
+    COALESCE(AVG(o.quantity), 0) as avg_quantity_per_order,
+    COALESCE(COUNT(DISTINCT o.order_number), 0) as number_of_orders,
+    MIN(o.date) as first_sale_date,
+    MAX(o.date) as last_sale_date
+FROM 
+    products p
+LEFT JOIN 
+    orders o ON p.product_id = o.product_id
+WHERE 
+    o.canceled = false
+GROUP BY 
+    p.product_id, p.SKU, p.title;
+
+-- Create view for inventory health
+CREATE OR REPLACE VIEW inventory_health AS
+SELECT 
+    p.product_id,
+    p.SKU,
+    p.title,
+    p.stock_quantity,
+    pm.daily_sales_avg,
+    pm.days_of_inventory,
+    pm.reorder_point,
+    pm.safety_stock,
+    CASE 
+        WHEN p.stock_quantity <= pm.safety_stock THEN 'Critical'
+        WHEN p.stock_quantity <= pm.reorder_point THEN 'Reorder'
+        WHEN p.stock_quantity > (pm.daily_sales_avg * 90) THEN 'Overstocked'
+        ELSE 'Healthy'
+    END as stock_status
+FROM 
+    products p
+LEFT JOIN 
+    product_metrics pm ON p.product_id = pm.product_id
+WHERE 
+    p.managing_stock = true;