add GET delivery count route

backend/internal/db/sqlc/querier.go

@@ -15,6 +15,7 @@ type Querier interface {
 	DeleteDelivery(ctx context.Context, id pgtype.UUID) error
 	GetDeliveriesByDate(ctx context.Context, date pgtype.Date) ([]Delivery, error)
 	GetDeliveryByID(ctx context.Context, id pgtype.UUID) (Delivery, error)
+	GetDeliveryCount(ctx context.Context) ([]GetDeliveryCountRow, error)
 	UpdateDelivery(ctx context.Context, arg UpdateDeliveryParams) error
 }
 

backend/internal/db/sqlc/query.sql.go

@@ -127,6 +127,35 @@ func (q *Queries) GetDeliveryByID(ctx context.Context, id pgtype.UUID) (Delivery
 	return i, err
 }
 
+const getDeliveryCount = `-- name: GetDeliveryCount :many
+SELECT COUNT(*) as count, date FROM deliveries WHERE date >= DATE_TRUNC('month', CURRENT_DATE) GROUP BY date
+`
+
+type GetDeliveryCountRow struct {
+	Count int64       `db:"count" json:"count"`
+	Date  pgtype.Date `db:"date" json:"date"`
+}
+
+func (q *Queries) GetDeliveryCount(ctx context.Context) ([]GetDeliveryCountRow, error) {
+	rows, err := q.db.Query(ctx, getDeliveryCount)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	items := []GetDeliveryCountRow{}
+	for rows.Next() {
+		var i GetDeliveryCountRow
+		if err := rows.Scan(&i.Count, &i.Date); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
 const updateDelivery = `-- name: UpdateDelivery :exec
 UPDATE deliveries SET date = $1, pickup_location = $2, product_name = $3, address = $4, phone = $5, additional_phone = $6, has_elevator = $7, comment = $8, updated_at = NOW() WHERE id = $9
 `