feat(elixir): storage location system

priv/repo/migrations/20250914113737_create_storage_locations.exs

@@ -0,0 +1,29 @@
+defmodule ComponentsElixir.Repo.Migrations.CreateStorageLocations do
+  use Ecto.Migration
+
+  def change do
+    create table(:storage_locations) do
+      add :name, :string, null: false
+      add :description, :text
+      add :qr_code, :string, null: false
+      add :level, :integer, default: 0
+      add :path, :text, null: false
+      add :is_active, :boolean, default: true
+      add :parent_id, references(:storage_locations, on_delete: :restrict)
+
+      timestamps()
+    end
+
+    create unique_index(:storage_locations, [:qr_code])
+    create index(:storage_locations, [:parent_id])
+    create index(:storage_locations, [:level])
+    create unique_index(:storage_locations, [:name, :parent_id])
+
+    # Enable trigram extension for path searching
+    execute "CREATE EXTENSION IF NOT EXISTS pg_trgm", "DROP EXTENSION IF EXISTS pg_trgm"
+
+    # GIN index for fast path-based searches
+    execute "CREATE INDEX storage_locations_path_gin_idx ON storage_locations USING gin(path gin_trgm_ops)",
+            "DROP INDEX storage_locations_path_gin_idx"
+  end
+end