feat(ADM-018): completed feature

project/migrations/011_inventory.js

@@ -0,0 +1,44 @@
+/**
+ * Inventory stock counters and movement audit.
+ */
+
+/** @param {import('node-pg-migrate').MigrationBuilder} pgm */
+export const up = (pgm) => {
+  pgm.sql(`
+    CREATE TABLE inventory_stock (
+      id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+      variant_id uuid NOT NULL UNIQUE,
+      available integer NOT NULL DEFAULT 0,
+      reserved integer NOT NULL DEFAULT 0,
+      sold integer NOT NULL DEFAULT 0,
+      incoming integer NOT NULL DEFAULT 0,
+      created_at timestamptz NOT NULL DEFAULT now(),
+      updated_at timestamptz NOT NULL DEFAULT now(),
+      CONSTRAINT inventory_stock_available_non_negative CHECK (available >= 0),
+      CONSTRAINT inventory_stock_reserved_non_negative CHECK (reserved >= 0),
+      CONSTRAINT inventory_stock_sold_non_negative CHECK (sold >= 0),
+      CONSTRAINT inventory_stock_incoming_non_negative CHECK (incoming >= 0)
+    )
+  `);
+  pgm.sql('CREATE INDEX inventory_stock_variant_id_idx ON inventory_stock (variant_id)');
+
+  pgm.sql(`
+    CREATE TABLE inventory_movements (
+      id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+      variant_id uuid NOT NULL,
+      operation text NOT NULL,
+      quantity integer NOT NULL,
+      created_at timestamptz NOT NULL DEFAULT now(),
+      CONSTRAINT inventory_movements_quantity_non_negative CHECK (quantity >= 0),
+      CONSTRAINT inventory_movements_operation_check
+        CHECK (operation IN ('reserve', 'release', 'confirm', 'set_available'))
+    )
+  `);
+  pgm.sql('CREATE INDEX inventory_movements_variant_id_idx ON inventory_movements (variant_id)');
+};
+
+/** @param {import('node-pg-migrate').MigrationBuilder} pgm */
+export const down = (pgm) => {
+  pgm.sql('DROP TABLE IF EXISTS inventory_movements');
+  pgm.sql('DROP TABLE IF EXISTS inventory_stock');
+};