[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;

loms/db/migrations/00002_create_stocks.sql

@@ -0,0 +1,10 @@
+-- +goose Up
+CREATE TABLE
+    stocks (
+        sku BIGINT PRIMARY KEY,
+        total_count BIGINT NOT NULL,
+        reserved BIGINT NOT NULL DEFAULT 0
+    );
+
+-- +goose Down
+DROP TABLE stocks;

loms/db/migrations/00003_add_stocks.sql

@@ -0,0 +1,24 @@
+-- +goose Up
+INSERT INTO
+  stocks (sku, total_count, reserved)
+VALUES
+  (139275865, 65534, 0),
+  (2956315, 100, 30),
+  (1076963, 100, 35),
+  (135717466, 100, 20),
+  (135937324, 100, 30),
+  (1625903, 10000, 0),
+  (1148162, 100, 0);
+
+-- +goose Down
+DELETE FROM stocks
+WHERE
+  sku IN (
+    139275865,
+    2956315,
+    1076963,
+    135717466,
+    135937324,
+    1625903,
+    1148162
+  );