[hw-4] add postgres db

loms/db/migrations/00001_create_orders.sql

@@ -0,0 +1,20 @@
+-- +goose Up
+CREATE TABLE
+    orders (
+        id bigserial PRIMARY KEY,
+        status_name TEXT NOT NULL DEFAULT '',
+        user_id BIGINT NOT NULL
+    );
+
+CREATE TABLE
+    order_items (
+        id bigserial PRIMARY KEY,
+        order_id BIGINT NOT NULL REFERENCES orders (id) ON DELETE CASCADE,
+        sku BIGINT NOT NULL,
+        COUNT BIGINT NOT NULL CHECK (COUNT > 0)
+    );
+
+-- +goose Down
+DROP TABLE order_items;
+
+DROP TABLE orders;