Handle circular required keys

Use a dummy-value at first and update it later.
Deferrable doesn't seem to work for NOT NULL - only
for FOREIGN KEYs.

postgres/budgets.sql.go

@@ -12,13 +12,18 @@ import (
 
 const createBudget = `-- name: CreateBudget :one
 INSERT INTO budgets
-(name, last_modification)
-VALUES ($1, NOW())
+(name, income_category_id, last_modification)
+VALUES ($1, $2, NOW())
 RETURNING id, name, last_modification, income_category_id
 `
 
-func (q *Queries) CreateBudget(ctx context.Context, name string) (Budget, error) {
-	row := q.db.QueryRowContext(ctx, createBudget, name)
+type CreateBudgetParams struct {
+	Name             string
+	IncomeCategoryID uuid.UUID
+}
+
+func (q *Queries) CreateBudget(ctx context.Context, arg CreateBudgetParams) (Budget, error) {
+	row := q.db.QueryRowContext(ctx, createBudget, arg.Name, arg.IncomeCategoryID)
 	var i Budget
 	err := row.Scan(
 		&i.ID,