Added model migration for updated width and height defaults

Instead of _not_ having defaults for these values, we'll use zeros for width and height which ensures the types remains valid while also indicating these values need updating. The down migration ensures zeros are used in order to preserve the type as well.

Milestone: minor

config/db/migrate/20260401162632_alter_model_width_and_height_defaults.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+ROM::SQL.migration do
+  up do
+    alter_table :model do
+      set_column_default :width, 0
+      set_column_default :height, 0
+    end
+  end
+
+  down do
+    alter_table :model do
+      set_column_default :width, 0
+      set_column_default :height, 0
+    end
+  end
+end

config/db/structure.sql

@@ -523,8 +523,8 @@ CREATE TABLE public.model (
     name text NOT NULL,
     label text NOT NULL,
     description text,
-    width integer NOT NULL,
-    height integer NOT NULL,
+    width integer DEFAULT 0 NOT NULL,
+    height integer DEFAULT 0 NOT NULL,
     mime_type text DEFAULT 'image/png'::text NOT NULL,
     colors integer DEFAULT 2 NOT NULL,
     bit_depth integer DEFAULT 1 NOT NULL,
@@ -1542,4 +1542,5 @@ INSERT INTO schema_migrations (filename) VALUES
 ('20260318132419_add_palette.rb'),
 ('20260330115025_add_extension_mode_column.rb'),
 ('20260330145138_alter_device_battery_columns.rb'),
-('20260331102522_add_device_wake_reason_column.rb');
+('20260331102522_add_device_wake_reason_column.rb'),
+('20260401162632_alter_model_width_and_height_defaults.rb');