Fix purchase orders import

inventory-server/db/schema.sql

@@ -4,7 +4,12 @@ SET session_replication_role = 'replica';  -- Disable foreign key checks tempora
 -- Create function for updating timestamps
 CREATE OR REPLACE FUNCTION update_updated_column() RETURNS TRIGGER AS $func$
 BEGIN
-    NEW.updated = CURRENT_TIMESTAMP;
+    -- Check which table is being updated and use the appropriate column
+    IF TG_TABLE_NAME = 'categories' THEN
+        NEW.updated_at = CURRENT_TIMESTAMP;
+    ELSE
+        NEW.updated = CURRENT_TIMESTAMP;
+    END IF;
     RETURN NEW;
 END;
 $func$ language plpgsql;
@@ -160,7 +165,7 @@ CREATE TABLE purchase_orders (
     expected_date DATE,
     pid BIGINT NOT NULL,
     sku VARCHAR(50) NOT NULL,
-    name VARCHAR(100) NOT NULL,
+    name VARCHAR(255) NOT NULL,
     cost_price DECIMAL(10, 3) NOT NULL,
     po_cost_price DECIMAL(10, 3) NOT NULL,
     status SMALLINT DEFAULT 1,
@@ -171,7 +176,7 @@ CREATE TABLE purchase_orders (
     received INTEGER DEFAULT 0,
     received_date DATE,
     last_received_date DATE,
-    received_by VARCHAR(100),
+    received_by VARCHAR,
     receiving_history JSONB,
     updated TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
     FOREIGN KEY (pid) REFERENCES products(pid),