Add available balance

postgres/schema/202112072032_income-category.sql

@@ -0,0 +1,14 @@
+-- +goose Up
+ALTER TABLE budgets ADD COLUMN income_category_id uuid NULL REFERENCES categories (id);
+UPDATE budgets
+SET income_category_id = (
+        SELECT categories.id
+        FROM categories
+        LEFT JOIN category_groups ON category_groups.id = categories.category_group_id
+        WHERE categories.name = 'Ready to Assign'
+        AND category_groups.budget_id = budgets.id
+);
+ALTER TABLE budgets ALTER COLUMN income_category_id SET NOT NULL;
+
+-- +goose Down
+ALTER TABLE budgets DROP COLUMN income_category_id;