Use date_trunc instead of splitting date into year and month

postgres/assignments.sql.go

@@ -54,7 +54,7 @@ func (q *Queries) DeleteAllAssignments(ctx context.Context, budgetID uuid.UUID)
 }
 
 const getAssignmentsByMonthAndCategory = `-- name: GetAssignmentsByMonthAndCategory :many
-SELECT year, month, category_id, budget_id, amount
+SELECT date, category_id, budget_id, amount
 FROM assignments_by_month
 WHERE assignments_by_month.budget_id = $1
 `
@@ -69,8 +69,7 @@ func (q *Queries) GetAssignmentsByMonthAndCategory(ctx context.Context, budgetID
 	for rows.Next() {
 		var i AssignmentsByMonth
 		if err := rows.Scan(
-			&i.Year,
-			&i.Month,
+			&i.Date,
 			&i.CategoryID,
 			&i.BudgetID,
 			&i.Amount,