Unhardcode booked margin

Well, just move the hardcoded values. This will be useful for ad-hoc
bookings and also one step closer to being fully configurable.

app.go

@@ -23,6 +23,7 @@ import (
 	"context"
 	"net/http"
 	"strconv"
+	"time"
 
 	api "github.com/eliona-smart-building-assistant/go-eliona-api-client/v2"
 	"github.com/eliona-smart-building-assistant/go-eliona/app"
@@ -157,7 +158,9 @@ func processNoShow() error {
 
 func updateOccupancy() error {
 	ctx := context.Background()
-	bookedAssets, err := conf.GetBookedAssetIDs(ctx)
+	since := time.Now()
+	until := since.Add(30 * time.Minute)
+	bookedAssets, err := conf.GetBookedAssetIDs(ctx, since, until)
 	if err != nil {
 		log.Error("conf", "getting booked asset IDs: %v", err)
 		return err
@@ -166,7 +169,7 @@ func updateOccupancy() error {
 		log.Error("eliona", "setting booked assets: %v", err)
 		return err
 	}
-	unbookedAssets, err := conf.GetUnbookedAssetIDs(ctx)
+	unbookedAssets, err := conf.GetUnbookedAssetIDs(ctx, since, until)
 	if err != nil {
 		log.Error("conf", "getting booked asset IDs: %v", err)
 		return err

conf/conf.go

@@ -291,9 +291,7 @@ const bookedAsssetsCTE = `
 			AND e.end_time >= $2
 	)`
 
-func GetBookedAssetIDs(ctx context.Context) ([]int32, error) {
-	since := time.Now()
-	until := since.Add(30 * time.Minute)
+func GetBookedAssetIDs(ctx context.Context, since, until time.Time) ([]int32, error) {
 	var assetIDs []*AssetID
 	if err := queries.
 		RawG(bookedAsssetsCTE+`
@@ -310,9 +308,7 @@ func GetBookedAssetIDs(ctx context.Context) ([]int32, error) {
 	return ids, nil
 }
 
-func GetUnbookedAssetIDs(ctx context.Context) ([]int32, error) {
-	since := time.Now()
-	until := since.Add(30 * time.Minute)
+func GetUnbookedAssetIDs(ctx context.Context, since, until time.Time) ([]int32, error) {
 	var assetIDs []*AssetID
 	if err := queries.
 		RawG(bookedAsssetsCTE+`