feat: add stickers delete api

internal/service/gift_service_test.go

@@ -2,6 +2,7 @@ package service
 
 import (
 	"context"
+	"errors"
 	"os"
 	"path/filepath"
 	"testing"
@@ -138,3 +139,68 @@ func TestGift_ArrivesWrappedAndOpensOnce(t *testing.T) {
 		t.Error("re-gifting re-wrapped an already opened gift")
 	}
 }
+
+// Deleting a custom gift must clear it from every gallery it reached, and must
+// refuse to touch the seeded catalog — a seeded reward would return on the
+// next Seed run, after having been ripped out of people's galleries.
+func TestGift_DeleteRemovesItFromEveryGallery(t *testing.T) {
+	rewards, pg := testRewardRepo(t)
+	ctx := context.Background()
+	user := giftUser(t, pg)
+
+	// A custom reward, as the admin panel creates them.
+	key := "custom_probe_" + uuid.NewString()[:8]
+	if _, err := pg.Pool.Exec(ctx, `
+		INSERT INTO sadhna_rewards (key, name, image_url)
+		VALUES ($1, 'Probe Gift', 'https://example.invalid/p.png')`, key); err != nil {
+		t.Fatal(err)
+	}
+	reward, err := rewards.ByKey(ctx, key)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := rewards.GrantGiftToEveryone(ctx, reward.ID); err != nil {
+		t.Fatal(err)
+	}
+
+	held := func() int {
+		grants, err := rewards.GrantsByUser(ctx, user)
+		if err != nil {
+			t.Fatal(err)
+		}
+		n := 0
+		for _, g := range grants {
+			if g.Reward.Key == key {
+				n++
+			}
+		}
+		return n
+	}
+	if held() != 1 {
+		t.Fatalf("setup: the gift did not reach the gallery")
+	}
+
+	if err := rewards.DeleteCustom(ctx, key); err != nil {
+		t.Fatal(err)
+	}
+	if held() != 0 {
+		t.Error("deleting the reward left it in a devotee's gallery")
+	}
+	if _, err := rewards.ByKey(ctx, key); !errors.Is(err, repository.ErrRewardNotFound) {
+		t.Errorf("reward still in the catalog: %v", err)
+	}
+
+	// Seeded rewards are off limits.
+	var seeded string
+	if err := pg.Pool.QueryRow(ctx,
+		`SELECT key FROM sadhna_rewards WHERE key NOT LIKE 'custom\_%' LIMIT 1`,
+	).Scan(&seeded); err != nil {
+		t.Skip("no seeded rewards to test against")
+	}
+	if err := rewards.DeleteCustom(ctx, seeded); !errors.Is(err, repository.ErrRewardNotFound) {
+		t.Errorf("a seeded reward was deletable: %v", err)
+	}
+	if _, err := rewards.ByKey(ctx, seeded); err != nil {
+		t.Errorf("the seeded reward was removed: %v", err)
+	}
+}