feat: create inventory_status table and modify inventory_items to use status_id

backend/migrations/00005_create_inventory_status.sql

@@ -0,0 +1,5 @@
+-- +goose Up
+CREATE TABLE inventory_status (
+    id SERIAL PRIMARY KEY,
+    name TEXT NOT NULL UNIQUE
+);

backend/migrations/00006_modify_inventory_table.sql

@@ -0,0 +1,15 @@
+-- +goose Up
+ALTER TABLE inventory_items
+ADD COLUMN status_id INT;
+
+UPDATE inventory_items
+SET status_id = (SELECT id FROM inventory_status WHERE name = inventory_items.status);
+
+ALTER TABLE inventory_items
+DROP COLUMN status;
+
+ALTER TABLE inventory_items
+ADD CONSTRAINT fk_inventory_items_status FOREIGN KEY (status_id) REFERENCES inventory_status(id) ON DELETE CASCADE;
+
+CREATE INDEX idx_inventory_items_status_id ON inventory_items(status_id);
+

backend/migrations/00007_create_inventory_status.sql

@@ -0,0 +1,7 @@
+-- +goose Up
+-- Insert default statuses into the inventory_status table
+INSERT INTO inventory_status (name) 
+VALUES 
+    ('In Stock'),
+    ('Low Stock'),
+    ('Out Of Stock');