Set up change tracking in core tables

inventory-server/db/metrics-schema.sql

@@ -1,6 +1,44 @@
 -- Disable foreign key checks
 SET FOREIGN_KEY_CHECKS = 0;
 
+-- Create metric status tracking table
+CREATE TABLE IF NOT EXISTS product_metric_status (
+    pid BIGINT NOT NULL,
+    last_calculated_at TIMESTAMP NULL,
+    needs_recalculation BOOLEAN DEFAULT TRUE,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    PRIMARY KEY (pid),
+    INDEX idx_needs_recalc (needs_recalculation),
+    INDEX idx_last_calc (last_calculated_at),
+    FOREIGN KEY (pid) REFERENCES products(pid) ON DELETE CASCADE
+) ENGINE=InnoDB;
+
+-- Add triggers for metric recalculation
+DROP TRIGGER IF EXISTS orders_after_insert_update;
+CREATE TRIGGER orders_after_insert_update AFTER INSERT ON orders FOR EACH ROW 
+    INSERT INTO product_metric_status (pid, needs_recalculation)
+    VALUES (NEW.pid, TRUE)
+    ON DUPLICATE KEY UPDATE 
+        needs_recalculation = TRUE,
+        updated_at = CURRENT_TIMESTAMP;
+
+DROP TRIGGER IF EXISTS purchase_orders_after_insert_update;
+CREATE TRIGGER purchase_orders_after_insert_update AFTER INSERT ON purchase_orders FOR EACH ROW 
+    INSERT INTO product_metric_status (pid, needs_recalculation)
+    VALUES (NEW.pid, TRUE)
+    ON DUPLICATE KEY UPDATE 
+        needs_recalculation = TRUE,
+        updated_at = CURRENT_TIMESTAMP;
+
+DROP TRIGGER IF EXISTS products_after_insert_update;
+CREATE TRIGGER products_after_insert_update AFTER INSERT ON products FOR EACH ROW 
+    INSERT INTO product_metric_status (pid, needs_recalculation)
+    VALUES (NEW.pid, TRUE)
+    ON DUPLICATE KEY UPDATE 
+        needs_recalculation = TRUE,
+        updated_at = CURRENT_TIMESTAMP;
+
 -- Temporary tables for batch metrics processing
 CREATE TABLE IF NOT EXISTS temp_sales_metrics (
     pid BIGINT NOT NULL,
@@ -410,21 +448,4 @@ LEFT JOIN
     category_metrics cm ON c.cat_id = cm.category_id;
 
 -- Re-enable foreign key checks
-SET FOREIGN_KEY_CHECKS = 1;
-
--- Create table for sales seasonality factors
-CREATE TABLE IF NOT EXISTS sales_seasonality (
-    month INT NOT NULL,
-    seasonality_factor DECIMAL(5,3) DEFAULT 0,
-    last_updated TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    PRIMARY KEY (month),
-    CHECK (month BETWEEN 1 AND 12),
-    CHECK (seasonality_factor BETWEEN -1.0 AND 1.0)
-);
-
--- Insert default seasonality factors (neutral)
-INSERT INTO sales_seasonality (month, seasonality_factor)
-VALUES 
-    (1, 0), (2, 0), (3, 0), (4, 0), (5, 0), (6, 0),
-    (7, 0), (8, 0), (9, 0), (10, 0), (11, 0), (12, 0)
-ON DUPLICATE KEY UPDATE last_updated = CURRENT_TIMESTAMP; 
+SET FOREIGN_KEY_CHECKS = 1;