minor: New Game Digimon Digi-Battle (#17)

* digimon digi battle added to supported games

* sonarqube update

* readme update

---------

Co-authored-by: sdine <sdine@sdine.com>

.github/workflows/feature-ci.yml

@@ -58,7 +58,7 @@ jobs:
           --exclude "^tests/"
 
       - name: SonarQube Cloud scan
-        uses: SonarSource/sonarqube-scan-action@v5
+        uses: SonarSource/sonarqube-scan-action@v6
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

.github/workflows/master-ci.yml

@@ -58,7 +58,7 @@ jobs:
           --exclude "^tests/"
 
       - name: SonarQube Cloud scan
-        uses: SonarSource/sonarqube-scan-action@v5
+        uses: SonarSource/sonarqube-scan-action@v6
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

AGENTS.md

@@ -5,7 +5,7 @@ C++ desktop implementation (originally based on a Tauri Rust+TS version) — sin
 ## Project structure
 
 - `core/` — `ccm_core` static library. UI-agnostic domain, ports, services, infra adapters. **Never** depends on wxWidgets. See `core/AGENTS.md`.
-- `ui_wx/` — `ccm_ui_wx` static library. The only place that touches wxWidgets. See `ui_wx/AGENTS.md`. Ships `ui_wx/assets/ygo_card_back.png` (Yu-Gi-Oh! offline preview fallback); `app/CMakeLists.txt` copies it to `<exeDir>/assets/` when linking `ccm`.
+- `ui_wx/` — `ccm_ui_wx` static library. The only place that touches wxWidgets. See `ui_wx/AGENTS.md`. Ships `ui_wx/assets/ygo_card_back.png` and `ui_wx/assets/digibattle99_card_back.png` (offline preview fallbacks); `app/CMakeLists.txt` copies them to `<exeDir>/assets/` when linking `ccm`.
 - `app/` — `ccm` executable (composition root). Wires concrete adapters into services. See `app/AGENTS.md`.
 - `tests/` — `ccm_core_tests` doctest binary. Pure-logic tests against in-memory fakes. See `tests/AGENTS.md`.
 - `docs/` — long-form developer documentation. Start with `docs/adding-a-new-game.md` for the canonical end-to-end procedure for extending the app with a new TCG. See `docs/AGENTS.md`.
@@ -84,7 +84,7 @@ Run from the **workspace root**.
 - Card preview round-trips are slow (HTTPS handshake + image GET, often two hosts). The three amortizations in place — all game-agnostic — must stay. The full update mechanic (key-driven invalidation, positive↔negative same-key replacement, eviction, manual cache clearing) is documented in `docs/caching.md` → "Updating cached entries"; do **not** add a side-channel `clearCache(...)` API to `CardPreviewService` — keep updates flowing through cache keys so the in-memory and disk tiers stay aligned automatically.
   - `CardPreviewService` keeps a bounded in-memory LRU (`kCacheCapacity`) of preview bytes keyed by `(game, name, setId, setNo)` plus a by-URL cache for the per-game card-back fallback. Re-selecting a row already viewed in this session is decode-only, no HTTP. Source failures are split by `PreviewLookupError::Kind`: `NotFound` (the upstream answered cleanly that the record has no image) is **negative-cached** so subsequent clicks short-circuit to the card-back placeholder without HTTP, while `Transient` (HTTP/network/parse) is **never** cached so a brief outage can recover on the next selection. Editing a lookup-relevant field changes the cache key and invalidates the negative entry automatically.
   - `LocalPreviewByteCache` (port `IPreviewByteCache`) extends the LRU with an on-disk byte cache rooted at `<exeDir>/.cache/preview-cache/` — **next to the executable, in the same scope as `config.json`, NOT inside the user-configurable `dataStorage` path** so previews don't follow the user's collection when the data-storage path is reconfigured (the umbrella `.cache/` directory is reserved for any future computed-from-network caches). Both positive previews and `NotFound` verdicts **survive app restarts**. Lookup order is memory → disk → source/HTTP; a disk hit (positive or negative) is promoted into the in-memory tier so the follow-up call stays decode-only. Total `.bin` payload size is capped (default 64 MiB) and oldest-by-mtime entries are evicted when a new write would exceed the cap; tiny `.neg` markers are not counted against the cap. The persistent tier is fire-and-forget: any I/O error is swallowed by the adapter so disk problems can never break the preview path.
-  - `CprHttpClient` owns a single long-lived `cpr::Session` (and therefore a single libcurl easy handle) with keep-alive enabled, so repeat HTTPS calls to the same host (`api.scryfall.com`, `api.pokemontcg.io`, `db.ygoprodeck.com`, `yugipedia.com`, `ms.yugipedia.com`) reuse the existing TLS connection. Concurrent callers are serialized through a mutex — easy handles are not thread-safe and the preview path is single-flight already. Session default **`Accept: */*`** keeps JSON info APIs and binary image GETs on one client; **`CardPreviewService::fetchAndCache`** rejects empty HTTP bodies so a bogus 200 cannot masquerade as a cached preview.
+  - `CprHttpClient` owns a single long-lived `cpr::Session` (and therefore a single libcurl easy handle) with keep-alive enabled, so repeat HTTPS calls to the same host (`api.scryfall.com`, `api.pokemontcg.io`, `db.ygoprodeck.com`, `yugipedia.com`, `ms.yugipedia.com`, `digimoncard.io`, `images.digimoncard.io`) reuse the existing TLS connection. Concurrent callers are serialized through a mutex — easy handles are not thread-safe and the preview path is single-flight already. Session default **`Accept: */*`** keeps JSON info APIs and binary image GETs on one client; **`CardPreviewService::fetchAndCache`** rejects empty HTTP bodies so a bogus 200 cannot masquerade as a cached preview.
 
 ## Windows UI theming guardrails
 

README.md

@@ -9,21 +9,38 @@ Currently, the application supports the following TCGs:
 - Magic the Gathering
 - Pokemon TCG
 - Yu-Gi-Oh!
+- Digimon (Digi-Battle)
 
 ## Screenshots
 
-### Magic The Gathering
+<details open>
+<summary>Magic The Gathering</summary>
 
 ![CCM3 Demo - Magic: The Gathering](docs/assets/images/demo-mtg.png)
 
-### Pokemon TCG
+</details>
+
+<details>
+<summary>Pokemon TCG</summary>
 
 ![CCM3 Demo - Pokemon](docs/assets/images/demo-pkm.png)
 
-### Yu-Gi-Oh!
+</details>
+
+<details>
+<summary>Yu-Gi-Oh!</summary>
 
 ![CCM3 Demo - YuGiOh](docs/assets/images/demo-ygo.png)
 
+</details>
+
+<details>
+<summary>Digimon (Digi-Battle)</summary>
+
+![CCM3 Demo - Digimon Digi-Battle](docs/assets/images/demo-digibattle99.png)
+
+</details>
+
 
 ## Migrating From CCM1 And CCM2
 

app/AGENTS.md

@@ -5,11 +5,11 @@ The `ccm` executable — composition root only. The single place where concrete
 ## File pointers
 
 - `main.cpp` — the entire app. Defines `CcmApp : public wxApp`, builds the dependency graph in `OnInit()`, then hands an `AppContext` to `MainFrame`.
-- `CMakeLists.txt` — declares the `ccm` target. Sets `WIN32_EXECUTABLE TRUE` on Windows so no console window appears. Links `ccm_core`, `ccm_ui_wx`, `ccm_warnings`. **`POST_BUILD`**: creates `$<TARGET_FILE_DIR:ccm>/assets/` and copies `ui_wx/assets/ygo_card_back.png` there so Yu-Gi-Oh! preview fallbacks work offline (see `BaseSelectedCardPanel` / `docs/assets-and-info-apis.md`).
+- `CMakeLists.txt` — declares the `ccm` target. Sets `WIN32_EXECUTABLE TRUE` on Windows so no console window appears. Links `ccm_core`, `ccm_ui_wx`, `ccm_warnings`. **`POST_BUILD`**: creates `$<TARGET_FILE_DIR:ccm>/assets/` and copies `ui_wx/assets/ygo_card_back.png` and `ui_wx/assets/digibattle99_card_back.png` there so Yu-Gi-Oh! / Digi-Battle preview fallbacks work offline (see `BaseSelectedCardPanel` / `docs/assets-and-info-apis.md`).
 
 ## Conventions
 
-1. **Composition root is the only place** that names concrete adapters: `StdFileSystem`, `CprHttpClient`, `JsonCollectionRepository<MagicCard>`, `JsonCollectionRepository<PokemonCard>`, `JsonCollectionRepository<YuGiOhCard>`, `JsonSetRepository`, `LocalImageStore`, `LocalPreviewByteCache`, `MagicGameModule`, `PokemonGameModule`, `YuGiOhGameModule`, `MagicGameView`, `PokemonGameView`, `YuGiOhGameView`, etc. If a concrete adapter type appears anywhere else in the codebase, move the wiring here.
+1. **Composition root is the only place** that names concrete adapters: `StdFileSystem`, `CprHttpClient`, `JsonCollectionRepository<MagicCard>`, `JsonCollectionRepository<PokemonCard>`, `JsonCollectionRepository<YuGiOhCard>`, `JsonCollectionRepository<DigiBattle99Card>`, `JsonSetRepository`, `LocalImageStore`, `LocalPreviewByteCache`, `MagicGameModule`, `PokemonGameModule`, `YuGiOhGameModule`, `DigiBattle99GameModule`, `MagicGameView`, `PokemonGameView`, `YuGiOhGameView`, `DigiBattle99GameView`, etc. If a concrete adapter type appears anywhere else in the codebase, move the wiring here.
 2. **Member declaration order in `CcmApp` matters** — destruction is reverse, so a member that depends on another (e.g. `magicCollSvc_` depends on `magicRepo_` and `imgStore_`; `previewSvc_` depends on `http_` and is consumed by `ctx_`; `magicView_` depends on the typed `magicCollSvc_` and the shared services) must be declared **after** its deps. Do not reorder casually.
 3. **Use `std::unique_ptr` for everything owned** by `CcmApp`. The `AppContext` then holds plain references into those owned objects, plus a vector of `IGameView*` raw pointers (the `unique_ptr<>`s for the views are the actual owners; the vector just describes the active set).
 4. **Game-to-directory mapping** lives in `dirNameForGame(Game)` (anonymous namespace). When adding a new game, extend this function — it is wired into all three repositories (`JsonCollectionRepository`, `JsonSetRepository`, `LocalImageStore`).
@@ -21,7 +21,7 @@ The `ccm` executable — composition root only. The single place where concrete
 
 ## Required follow-ups
 
-- The **`POST_BUILD` copy of `ygo_card_back.png`** must stay in sync with `ui_wx/assets/`; if you relocate install layout or add more bundled assets, mirror the pattern (`make_directory` + `copy_if_different`) and document under `docs/assets-and-info-apis.md` / `ui_wx/AGENTS.md`.
+- The **`POST_BUILD` copy of `ygo_card_back.png` / `digibattle99_card_back.png`** must stay in sync with `ui_wx/assets/`; if you relocate install layout or add more bundled assets, mirror the pattern (`make_directory` + `copy_if_different`) and document under `docs/assets-and-info-apis.md` / `ui_wx/AGENTS.md`.
 - After adding a new game module you **must**: (1) add a `unique_ptr<<Name>GameModule>` member in declaration-order-correct position, (2) construct it in `OnInit()`, (3) call `setSvc_->registerModule(<name>Mod_.get())`, (4) call `previewSvc_->registerModule(*<name>Mod_)` (no-op when the module has no preview source), (5) extend `dirNameForGame`, (6) add a typed `JsonCollectionRepository<<Name>Card>` + `CollectionService<<Name>Card>` if the game has a custom card type, (7) construct a `<Name>GameView` and append its raw pointer to the `AppContext::gameViews` vector, (8) make sure the view's `unique_ptr<>` member sits **after** all its deps (typed services + `IGameModule`).
 - After adding a new core service you **must** add a `unique_ptr<...>` member, construct it in `OnInit()` after its deps, and add a reference field to `AppContext`.
 - After adding a new dependency edge you **must** verify destruction order is still correct: deps **before** dependents in the member list.

app/CMakeLists.txt

@@ -19,9 +19,13 @@ target_link_libraries(ccm
         ccm_warnings
 )
 
-# Yu-Gi-Oh! preview fallback image (used when network card-back URLs fail).
+# Yu-Gi-Oh! / Digi-Battle preview fallback images (used when network card-back
+# URLs fail or no public URL exists).
 add_custom_command(TARGET ccm POST_BUILD
     COMMAND ${CMAKE_COMMAND} -E make_directory "$<TARGET_FILE_DIR:ccm>/assets"
     COMMAND ${CMAKE_COMMAND} -E copy_if_different
             "${CMAKE_SOURCE_DIR}/ui_wx/assets/ygo_card_back.png"
-            "$<TARGET_FILE_DIR:ccm>/assets/ygo_card_back.png")
+            "$<TARGET_FILE_DIR:ccm>/assets/ygo_card_back.png"
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+            "${CMAKE_SOURCE_DIR}/ui_wx/assets/digibattle99_card_back.png"
+            "$<TARGET_FILE_DIR:ccm>/assets/digibattle99_card_back.png")

app/main.cpp

@@ -2,9 +2,11 @@
 // it to the wxWidgets UI layer. This is the only place where concrete adapter
 // types are mentioned - everything downstream depends on interfaces.
 
+#include "ccm/domain/DigiBattle99Card.hpp"
 #include "ccm/domain/MagicCard.hpp"
 #include "ccm/domain/PokemonCard.hpp"
 #include "ccm/domain/YuGiOhCard.hpp"
+#include "ccm/games/digibattle99/DigiBattle99GameModule.hpp"
 #include "ccm/games/magic/MagicGameModule.hpp"
 #include "ccm/games/pokemon/PokemonGameModule.hpp"
 #include "ccm/games/yugioh/YuGiOhGameModule.hpp"
@@ -20,6 +22,7 @@
 #include "ccm/services/ImageService.hpp"
 #include "ccm/services/SetService.hpp"
 #include "ccm/ui/AppContext.hpp"
+#include "ccm/ui/DigiBattle99GameView.hpp"
 #include "ccm/ui/MagicGameView.hpp"
 #include "ccm/ui/MainFrame.hpp"
 #include "ccm/ui/PokemonGameView.hpp"
@@ -45,6 +48,7 @@ std::string dirNameForGame(ccm::Game g) {
         case ccm::Game::Magic:        return "magic";
         case ccm::Game::Pokemon:      return "pokemon";
         case ccm::Game::YuGiOh:       return "yugioh";
+        case ccm::Game::DigiBattle99: return "digibattle99";
     }
     return "magic";
 }
@@ -80,6 +84,7 @@ public:
         magicMod_ = std::make_unique<ccm::MagicGameModule>(*http_);
         pokeMod_  = std::make_unique<ccm::PokemonGameModule>(*http_);
         ygoMod_   = std::make_unique<ccm::YuGiOhGameModule>(*http_);
+        digiBattle99Mod_ = std::make_unique<ccm::DigiBattle99GameModule>(*http_);
 
         magicRepo_ = std::make_unique<ccm::JsonCollectionRepository<ccm::MagicCard>>(
             *fs_, *config_, &dirNameForGame);
@@ -87,6 +92,9 @@ public:
             *fs_, *config_, &dirNameForGame);
         ygoRepo_   = std::make_unique<ccm::JsonCollectionRepository<ccm::YuGiOhCard>>(
             *fs_, *config_, &dirNameForGame);
+        digiBattle99Repo_ =
+            std::make_unique<ccm::JsonCollectionRepository<ccm::DigiBattle99Card>>(
+                *fs_, *config_, &dirNameForGame);
         setRepo_   = std::make_unique<ccm::JsonSetRepository>(*fs_, *config_, &dirNameForGame);
         imgStore_  = std::make_unique<ccm::LocalImageStore>(*fs_, *config_, &dirNameForGame);
 
@@ -97,10 +105,14 @@ public:
             *pokeRepo_, *imgStore_);
         ygoCollSvc_   = std::make_unique<ccm::CollectionService<ccm::YuGiOhCard>>(
             *ygoRepo_, *imgStore_);
+        digiBattle99CollSvc_ =
+            std::make_unique<ccm::CollectionService<ccm::DigiBattle99Card>>(
+                *digiBattle99Repo_, *imgStore_);
         setSvc_       = std::make_unique<ccm::SetService>(*setRepo_);
         setSvc_->registerModule(magicMod_.get());
         setSvc_->registerModule(pokeMod_.get());
         setSvc_->registerModule(ygoMod_.get());
+        setSvc_->registerModule(digiBattle99Mod_.get());
 
         // Disk-backed preview cache lives next to the executable, in the same
         // location scope as config.json - NOT inside the user's data-storage
@@ -120,6 +132,7 @@ public:
         previewSvc_->registerModule(*magicMod_);
         previewSvc_->registerModule(*pokeMod_);
         previewSvc_->registerModule(*ygoMod_);
+        previewSvc_->registerModule(*digiBattle99Mod_);
 
         // Per-game UI bundles. Order here is the order shown in the Game menu.
         magicView_ = std::make_unique<ccm::ui::MagicGameView>(
@@ -128,6 +141,9 @@ public:
             *config_, *pokeCollSvc_, *setSvc_, *imgSvc_, *previewSvc_, *pokeMod_);
         ygoView_   = std::make_unique<ccm::ui::YuGiOhGameView>(
             *config_, *ygoCollSvc_, *setSvc_, *imgSvc_, *previewSvc_, *ygoMod_);
+        digiBattle99View_ = std::make_unique<ccm::ui::DigiBattle99GameView>(
+            *config_, *digiBattle99CollSvc_, *setSvc_, *imgSvc_, *previewSvc_,
+            *digiBattle99Mod_);
 
         ctx_ = std::make_unique<ccm::ui::AppContext>(ccm::ui::AppContext{
             *config_,
@@ -137,7 +153,8 @@ public:
             *magicMod_,
             *pokeMod_,
             *ygoMod_,
-            { magicView_.get(), pokeView_.get(), ygoView_.get() },
+            *digiBattle99Mod_,
+            { magicView_.get(), pokeView_.get(), ygoView_.get(), digiBattle99View_.get() },
         });
 
         auto* frame = new ccm::ui::MainFrame(*ctx_);
@@ -158,21 +175,25 @@ private:
     std::unique_ptr<ccm::MagicGameModule>                            magicMod_;
     std::unique_ptr<ccm::PokemonGameModule>                          pokeMod_;
     std::unique_ptr<ccm::YuGiOhGameModule>                           ygoMod_;
+    std::unique_ptr<ccm::DigiBattle99GameModule>                     digiBattle99Mod_;
     std::unique_ptr<ccm::JsonCollectionRepository<ccm::MagicCard>>   magicRepo_;
     std::unique_ptr<ccm::JsonCollectionRepository<ccm::PokemonCard>> pokeRepo_;
     std::unique_ptr<ccm::JsonCollectionRepository<ccm::YuGiOhCard>>  ygoRepo_;
+    std::unique_ptr<ccm::JsonCollectionRepository<ccm::DigiBattle99Card>> digiBattle99Repo_;
     std::unique_ptr<ccm::JsonSetRepository>                          setRepo_;
     std::unique_ptr<ccm::LocalImageStore>                            imgStore_;
     std::unique_ptr<ccm::ImageService>                               imgSvc_;
     std::unique_ptr<ccm::CollectionService<ccm::MagicCard>>          magicCollSvc_;
     std::unique_ptr<ccm::CollectionService<ccm::PokemonCard>>        pokeCollSvc_;
     std::unique_ptr<ccm::CollectionService<ccm::YuGiOhCard>>         ygoCollSvc_;
+    std::unique_ptr<ccm::CollectionService<ccm::DigiBattle99Card>>   digiBattle99CollSvc_;
     std::unique_ptr<ccm::SetService>                                 setSvc_;
     std::unique_ptr<ccm::LocalPreviewByteCache>                      previewCache_;
     std::unique_ptr<ccm::CardPreviewService>                         previewSvc_;
     std::unique_ptr<ccm::ui::MagicGameView>                          magicView_;
     std::unique_ptr<ccm::ui::PokemonGameView>                        pokeView_;
     std::unique_ptr<ccm::ui::YuGiOhGameView>                         ygoView_;
+    std::unique_ptr<ccm::ui::DigiBattle99GameView>                   digiBattle99View_;
     std::unique_ptr<ccm::ui::AppContext>                             ctx_;
 };
 

core/AGENTS.md

@@ -4,11 +4,11 @@
 
 ## Layer pointers
 
-- `include/ccm/domain/` — POD value types: `Enums`, `Set`, `MagicCard`, `PokemonCard`, `YuGiOhCard`, `Configuration`. Each has `to_json` / `from_json` defined in the matching `src/domain/*.cpp`.
+- `include/ccm/domain/` — POD value types: `Enums`, `Set`, `MagicCard`, `PokemonCard`, `YuGiOhCard`, `DigiBattle99Card`, `Configuration`. Each has `to_json` / `from_json` defined in the matching `src/domain/*.cpp`.
 - `include/ccm/ports/` — interfaces (`IHttpClient`, `IFileSystem`, `ICollectionRepository<T>`, `ISetRepository`, `IImageStore`, `ICardPreviewSource`, `IPreviewByteCache`). All seams the services depend on. Add new ports here when adding new external concerns.
 - `include/ccm/services/` — high-level operations: `ConfigService`, `CollectionService<TCard>` (header-only template), `SetService`, `ImageService`, `CardPreviewService`, `CardSorter` (free functions; per-column sort comparators that mirror established table sorting behavior — UI-agnostic so they can be unit-tested directly), `CardFilter` (free functions; case-insensitive substring row matcher restricted to each game's `tableFields` valueKey list). They depend only on ports.
 - `include/ccm/infra/` — concrete adapters: `CprHttpClient`, `StdFileSystem`, `JsonCollectionRepository<T>` (header-only template), `JsonSetRepository`, `LocalImageStore`, `LocalPreviewByteCache`.
-- `include/ccm/games/` — `IGameModule` + per-game modules. `IGameModule` consolidates the per-game seams: every module owns an `ISetSource` (required) and may own an `ICardPreviewSource` (optional, default `nullptr`). `magic/`, `pokemon/`, and `yugioh/` are the reference implementations — all three expose a fully working set source + card preview source.
+- `include/ccm/games/` — `IGameModule` + per-game modules. `IGameModule` consolidates the per-game seams: every module owns an `ISetSource` (required) and may own an `ICardPreviewSource` (optional, default `nullptr`). `magic/`, `pokemon/`, `yugioh/`, and `digibattle99/` are the reference implementations — all four expose a fully working set source + card preview source.
 - `include/ccm/util/` — `Result.hpp` (the sum type), `FsNames.hpp` (filename munging ported from `util/fs.rs`), `YuGiOhPrintingSlot.hpp` / `YuGiOhSetLookup.hpp` (Yu-Gi-Oh! print-slot helpers and cached-set **set code** lookup for the edit dialog; both header-only, unit-tested).
 - `src/` mirrors `include/ccm/` for non-template implementations.
 
@@ -27,7 +27,7 @@
 8. **HTTP query strings must be percent-encoded** before they reach `IHttpClient::get`. `cpr::Url` does **not** encode the URL string we hand it. See `MagicCardPreviewSource::buildSearchUrl` for the canonical pattern (RFC 3986 unreserved-set encoder). `IHttpClient::get` accepts arbitrary bytes back — `Result<std::string>` is a binary buffer, not text, so callers can use it for image payloads directly.
 9. **Yu-Gi-Oh! preview uses Yugipedia, not YGOPRODeck.** `YuGiOhCardPreviewSource::fetchImageUrl` queries Yugipedia's MediaWiki API with a batched list of deterministic file names (`<Slug>-<SET>-<REGION>-<RARITY>-<EDITION>.<png|jpg>`) so per-printing reprints with shared passcodes (LOB Blue-Eyes vs SDK Blue-Eyes, …) resolve to genuinely different scans. Region candidates are **always English** (`EN`/`NA`/`EU`/`AU`) regardless of `card.language`; localized scans are not queried. YGOPRODeck remains as a last-resort fallback (see `parseFallbackImageUrl`) for cards Yugipedia hasn't scanned yet, and as the source for `detectFirstPrint` / `detectPrintVariants` (`parsePrintVariants` enumerates distinct printings for the edit dialog). **Do not** restore a YGOPRODeck-only image path: that endpoint's `card_images` array is keyed by art-treatment passcode, not by physical printing, and adding `cardset=` only reorders the same passcode list (alt-art often gets promoted) without ever surfacing the per-printing scan. The YGO source therefore needs the printed edition flag to be plumbed through; `YuGiOhSelectedCardPanel::previewKey()` packs it into the third tuple slot as `<setNo>||<rarity>||<1E|UE>` so the candidate list can prioritize the correct edition without changing the generic `ICardPreviewSource` interface.
 10. **Preview byte cache (`CardPreviewService`) is by `(game, name, setId, setNo)` across two tiers, with classified failure caching and a single update mechanic.** Successful `fetchPreviewBytes` results and successful `fetchImageBytesByUrl` results are stored first in a bounded in-memory LRU (`kCacheCapacity` entries, mutex-protected — the panel calls into the service from a worker thread) and then in an optional persistent byte cache (`IPreviewByteCache`, normally `LocalPreviewByteCache` rooted at `<exeDir>/.cache/preview-cache/` — next to the executable, **not** under `dataStorage`, so previews don't follow the user's collection when the data-storage path is reconfigured). **`fetchAndCache` rejects empty response bodies** (returns error, no tier write) so a degenerate HTTP 200 cannot fill the LRU with unusable entries. Lookup order is **memory → disk → source/HTTP**, and a disk hit (positive *or* negative) is promoted into the in-memory tier on its way to the caller so the next selection of the same row stays decode-only. **Failures are split by `PreviewLookupError::Kind`**: `NotFound` is negative-cached in both tiers (memory `CacheEntry::negative=true`, disk `<hash>.neg` marker) so the user gets an instant card-back on every subsequent click for cards whose printing genuinely has no upstream image; `Transient` (HTTP/network/parse failures) is **never** cached so a brief outage cannot permanently disable previews. Per-game `ICardPreviewSource::fetchImageUrl` implementations must classify their errors honestly — `NotFound` only when the upstream answered cleanly with no match / no image variants; anything that could be the network or a schema deviation is `Transient`. **The cache update mechanic is entirely key-driven and has no side-channel API:** (a) the user editing any lookup-relevant field of a card record changes the cache key, so the next selection misses both tiers and re-runs the source — this is how a stale negative entry gets dislodged after the user fixes the record, with no manual invalidation call needed; (b) a same-key resolution that flips between positive and negative outcomes overwrites the existing entry in both tiers (`store` removes any `.neg` for that hash; `storeNegative` removes any `.bin`) so `.bin` and `.neg` for the same hash are never co-resident; (c) eviction handles passive aging (LRU on the in-memory tier; oldest-by-mtime `.bin` files on the disk tier; `.neg` markers don't count against the size cap and are not actively evicted). **Do not add a `clearCache(...)` / `invalidate(...)` method** to `CardPreviewService`: the cache invariants depend on memory and disk staying aligned through the same write paths, and any side-channel API would just be a new way for future code to forget the disk tier. If you add a new lookup disambiguator (for example a future `editionTag` slot), pack it into one of the existing key fields (see `YuGiOhSelectedCardPanel::previewKey()`'s `||`-separated trailing fields) so editing the field continues to invalidate cached entries automatically. The persistent tier is **fire-and-forget**: the adapter swallows I/O errors so a flaky or full disk degrades the experience to a fresh-install warm-up, never to a broken preview path.
-11. **`CprHttpClient` keeps one persistent `cpr::Session` for the app's lifetime.** All callers (set sources, preview sources, fallback URL fetch, auto-detect) share the same libcurl easy handle so connections to repeat hosts (`api.scryfall.com`, `api.pokemontcg.io`, `db.ygoprodeck.com`, `yugipedia.com`, `ms.yugipedia.com`) are reused with TLS keep-alive. Default request headers use **`Accept: */*`** so JSON endpoints and binary image downloads share one session without pinning every GET to `application/json`. The session is not thread-safe — every `get(...)` is serialized through an internal mutex. **Do not** construct a new `cpr::Session` (or `cpr::Get(...)`) per call: that throws away the connection cache and re-pays the TLS handshake every time. If you need richer behavior on the port (POST, headers per call, …) extend `IHttpClient` and the adapter while keeping the single-session ownership intact.
+11. **`CprHttpClient` keeps one persistent `cpr::Session` for the app's lifetime.** All callers (set sources, preview sources, fallback URL fetch, auto-detect) share the same libcurl easy handle so connections to repeat hosts (`api.scryfall.com`, `api.pokemontcg.io`, `db.ygoprodeck.com`, `yugipedia.com`, `ms.yugipedia.com`, `digimoncard.io`, `images.digimoncard.io`) are reused with TLS keep-alive. Default request headers use **`Accept: */*`** so JSON endpoints and binary image downloads share one session without pinning every GET to `application/json`. The session is not thread-safe — every `get(...)` is serialized through an internal mutex. **Do not** construct a new `cpr::Session` (or `cpr::Get(...)`) per call: that throws away the connection cache and re-pays the TLS handshake every time. If you need richer behavior on the port (POST, headers per call, …) extend `IHttpClient` and the adapter while keeping the single-session ownership intact.
 
 ## Adding a new game
 

core/CMakeLists.txt

@@ -7,6 +7,7 @@ add_library(ccm_core STATIC
     src/domain/MagicCard.cpp
     src/domain/PokemonCard.cpp
     src/domain/YuGiOhCard.cpp
+    src/domain/DigiBattle99Card.cpp
     src/domain/Configuration.cpp
 
     src/services/ConfigService.cpp
@@ -31,6 +32,9 @@ add_library(ccm_core STATIC
     src/games/yugioh/YuGiOhSetSource.cpp
     src/games/yugioh/YuGiOhCardPreviewSource.cpp
     src/games/yugioh/YuGiOhGameModule.cpp
+    src/games/digibattle99/DigiBattle99SetSource.cpp
+    src/games/digibattle99/DigiBattle99CardPreviewSource.cpp
+    src/games/digibattle99/DigiBattle99GameModule.cpp
 
     src/util/FsNames.cpp
 )

core/include/ccm/domain/DigiBattle99Card.hpp

@@ -0,0 +1,38 @@
+#pragma once
+
+// DigiBattle99Card - Digimon Digi-Battle (1999 English) card model.
+// Pokémon-shaped field set (setNo / holo / firstEdition / signed / altered).
+
+#include "ccm/domain/Enums.hpp"
+#include "ccm/domain/Set.hpp"
+
+#include <nlohmann/json.hpp>
+
+#include <cstdint>
+#include <string>
+#include <vector>
+
+namespace ccm {
+
+struct DigiBattle99Card {
+    std::uint32_t id{0};
+    std::uint8_t  amount{1};
+    std::string   name;
+    Set           set;
+    std::string   setNo;
+    std::string   note;
+    std::vector<std::string> images;
+    Language      language{Language::English};
+    Condition     condition{Condition::NearMint};
+    bool          firstEdition{false};
+    bool          holo{false};
+    bool          signed_{false};
+    bool          altered{false};
+
+    friend bool operator==(const DigiBattle99Card&, const DigiBattle99Card&) = default;
+};
+
+void to_json(nlohmann::json& j, const DigiBattle99Card& c);
+void from_json(const nlohmann::json& j, DigiBattle99Card& c);
+
+}  // namespace ccm

core/include/ccm/domain/Enums.hpp

@@ -19,6 +19,7 @@ enum class Game {
     Magic,
     Pokemon,
     YuGiOh,
+    DigiBattle99,
 };
 
 enum class Language {
@@ -57,7 +58,7 @@ std::optional<Language>  languageFromString(std::string_view s) noexcept;
 std::optional<Condition> conditionFromString(std::string_view s) noexcept;
 std::optional<Theme>     themeFromString(std::string_view s) noexcept;
 
-const std::array<Game, 3>&       allGames() noexcept;
+const std::array<Game, 4>&       allGames() noexcept;
 const std::array<Language, 8>&   allLanguages() noexcept;
 const std::array<Condition, 7>&  allConditions() noexcept;
 const std::array<Theme, 2>&      allThemes() noexcept;

core/include/ccm/games/digibattle99/DigiBattle99CardPreviewSource.hpp

@@ -0,0 +1,67 @@
+#pragma once
+
+// DigiBattle99CardPreviewSource: digimoncard.io search + CDN card images for
+// Digimon Digi-Battle (1999 English).
+//
+// Preview key middle slot is Set.name (pack display name) so search.php?pack=
+// works without a reverse slug map. When setNo is present, the CDN URL is
+// built directly — no search round-trip.
+
+#include "ccm/ports/ICardPreviewSource.hpp"
+#include "ccm/ports/IHttpClient.hpp"
+
+#include <string>
+#include <string_view>
+#include <vector>
+
+namespace ccm {
+
+class DigiBattle99CardPreviewSource final : public ICardPreviewSource {
+public:
+    static constexpr const char* kSeries = "Digimon Digi-Battle Card Game";
+    static constexpr const char* kImageBase =
+        "https://images.digimoncard.io/images/cards/";
+
+    explicit DigiBattle99CardPreviewSource(IHttpClient& http);
+
+    [[nodiscard]] bool supportsAutoDetectPrint() const noexcept override { return true; }
+
+    Result<std::string, PreviewLookupError>
+        fetchImageUrl(std::string_view name,
+                      std::string_view setName,
+                      std::string_view setNo) override;
+    Result<AutoDetectedPrint> detectFirstPrint(std::string_view name,
+                                               std::string_view setName) override;
+    Result<std::vector<AutoDetectedPrint>> detectPrintVariants(std::string_view name,
+                                                               std::string_view setName) override;
+
+    // Uppercase the alphabetic prefix of a Digi-Battle card number (bo-88 -> BO-88).
+    // Does not invent zero-padding — CDN keys match API ids literally.
+    static std::string normalizeCardNumber(std::string_view setNo);
+
+    // CDN preview URL for a normalized card id (.jpg — wxImage registers
+    // JPEG/PNG only; digimoncard.io also serves .webp but we cannot decode it).
+    static std::string buildImageUrl(std::string_view setNo);
+
+    // digimoncard.io search URL: n= / pack= / series= / optional card=.
+    // setName is the pack display name (Set.name), not the slug id.
+    static std::string buildSearchUrl(std::string_view name,
+                                      std::string_view setName,
+                                      std::string_view setNo);
+
+    // Parse a digimoncard.io search.php body into a CDN image URL for the
+    // first exact name match (optional pack filter applied by the request).
+    static Result<std::string, PreviewLookupError>
+        parseImageUrlFromSearch(const std::string& body,
+                                std::string_view wantedCardName);
+
+    static Result<std::vector<AutoDetectedPrint>>
+        parsePrintVariants(const std::string& body,
+                           std::string_view setName,
+                           std::string_view wantedCardName);
+
+private:
+    IHttpClient& http_;
+};
+
+}  // namespace ccm

core/include/ccm/games/digibattle99/DigiBattle99GameModule.hpp

@@ -0,0 +1,27 @@
+#pragma once
+
+// DigiBattle99GameModule: Digimon Digi-Battle (1999 English) via digimoncard.io.
+
+#include "ccm/games/IGameModule.hpp"
+#include "ccm/games/digibattle99/DigiBattle99CardPreviewSource.hpp"
+#include "ccm/games/digibattle99/DigiBattle99SetSource.hpp"
+
+namespace ccm {
+
+class DigiBattle99GameModule final : public IGameModule {
+public:
+    explicit DigiBattle99GameModule(IHttpClient& http);
+
+    [[nodiscard]] Game        id() const noexcept override { return Game::DigiBattle99; }
+    [[nodiscard]] std::string dirName()     const override { return "digibattle99"; }
+    [[nodiscard]] std::string displayName() const override { return "Digimon (Digi-Battle)"; }
+
+    ISetSource&         setSource()          override { return setSource_; }
+    ICardPreviewSource* cardPreviewSource() noexcept override { return &previewSource_; }
+
+private:
+    DigiBattle99SetSource         setSource_;
+    DigiBattle99CardPreviewSource previewSource_;
+};
+
+}  // namespace ccm

core/include/ccm/games/digibattle99/DigiBattle99SetSource.hpp

@@ -0,0 +1,37 @@
+#pragma once
+
+// DigiBattle99SetSource: ISetSource for Digimon Digi-Battle (1999 English).
+// digimoncard.io has no dedicated sets endpoint; we derive unique pack names
+// from a bulk search.php call scoped to series=Digimon Digi-Battle Card Game.
+
+#include "ccm/games/IGameModule.hpp"
+#include "ccm/ports/IHttpClient.hpp"
+
+#include <string>
+#include <string_view>
+
+namespace ccm {
+
+class DigiBattle99SetSource final : public ISetSource {
+public:
+    static constexpr const char* kEndpoint =
+        "https://digimoncard.io/api-public/search.php?"
+        "series=Digimon%20Digi-Battle%20Card%20Game&limit=1000&sort=name&sortdirection=asc";
+
+    static constexpr const char* kSeries = "Digimon Digi-Battle Card Game";
+
+    explicit DigiBattle99SetSource(IHttpClient& http);
+
+    Result<std::vector<Set>> fetchAll() override;
+
+    // Pure parser exposed for unit testing without a network round-trip.
+    static Result<std::vector<Set>> parseResponse(const std::string& body);
+
+    // Stable Set.id from a pack display name (ASCII lower, non-alnum -> '-').
+    static std::string slugifyPackName(std::string_view packName);
+
+private:
+    IHttpClient& http_;
+};
+
+}  // namespace ccm

core/include/ccm/services/CardFilter.hpp

@@ -19,6 +19,7 @@
 //   * An empty filter matches every row, exactly as in JS where every string
 //     `.includes("")` returns true.
 
+#include "ccm/domain/DigiBattle99Card.hpp"
 #include "ccm/domain/MagicCard.hpp"
 #include "ccm/domain/PokemonCard.hpp"
 #include "ccm/domain/YuGiOhCard.hpp"
@@ -41,4 +42,8 @@ namespace ccm {
 [[nodiscard]] bool matchesYuGiOhFilter(const YuGiOhCard& card,
                                        std::string_view filter);
 
+// Digi-Battle mirrors Pokemon searchable columns (includes setNo).
+[[nodiscard]] bool matchesDigiBattle99Filter(const DigiBattle99Card& card,
+                                             std::string_view filter);
+
 }  // namespace ccm

core/include/ccm/services/CardSorter.hpp

@@ -16,6 +16,7 @@
 // UI relies on it so successive clicks on different columns compose predictably
 // (e.g. sort by name, then by set => grouped by set, name-sorted within each).
 
+#include "ccm/domain/DigiBattle99Card.hpp"
 #include "ccm/domain/MagicCard.hpp"
 #include "ccm/domain/PokemonCard.hpp"
 #include "ccm/domain/YuGiOhCard.hpp"
@@ -66,6 +67,20 @@ enum class YuGiOhSortColumn {
     Note,
 };
 
+// Digi-Battle mirrors Pokemon columns (setNo is filter-only, not a sort column).
+enum class DigiBattle99SortColumn {
+    Name,
+    SetReleaseDate,
+    Language,
+    Condition,
+    Amount,
+    Holo,
+    FirstEdition,
+    Signed,
+    Altered,
+    Note,
+};
+
 // Stable in-place sort. `ascending=false` runs the same comparator with
 // inverted sign, matching `byField(field, asc)` semantics.
 void sortMagicCards(std::vector<MagicCard>& cards, MagicSortColumn column,
@@ -74,5 +89,8 @@ void sortPokemonCards(std::vector<PokemonCard>& cards, PokemonSortColumn column,
                       bool ascending);
 void sortYuGiOhCards(std::vector<YuGiOhCard>& cards, YuGiOhSortColumn column,
                      bool ascending);
+void sortDigiBattle99Cards(std::vector<DigiBattle99Card>& cards,
+                           DigiBattle99SortColumn column,
+                           bool ascending);
 
 }  // namespace ccm

core/src/domain/DigiBattle99Card.cpp

@@ -0,0 +1,39 @@
+#include "ccm/domain/DigiBattle99Card.hpp"
+
+namespace ccm {
+
+void to_json(nlohmann::json& j, const DigiBattle99Card& c) {
+    j = nlohmann::json{
+        {"id",           c.id},
+        {"amount",       c.amount},
+        {"name",         c.name},
+        {"set",          c.set},
+        {"setNo",        c.setNo},
+        {"note",         c.note},
+        {"images",       c.images},
+        {"language",     c.language},
+        {"condition",    c.condition},
+        {"firstEdition", c.firstEdition},
+        {"holo",         c.holo},
+        {"signed",       c.signed_},
+        {"altered",      c.altered},
+    };
+}
+
+void from_json(const nlohmann::json& j, DigiBattle99Card& c) {
+    j.at("id").get_to(c.id);
+    j.at("amount").get_to(c.amount);
+    j.at("name").get_to(c.name);
+    j.at("set").get_to(c.set);
+    j.at("setNo").get_to(c.setNo);
+    j.at("note").get_to(c.note);
+    j.at("images").get_to(c.images);
+    j.at("language").get_to(c.language);
+    j.at("condition").get_to(c.condition);
+    j.at("firstEdition").get_to(c.firstEdition);
+    j.at("holo").get_to(c.holo);
+    j.at("signed").get_to(c.signed_);
+    j.at("altered").get_to(c.altered);
+}
+
+}  // namespace ccm

core/src/domain/Enums.cpp

@@ -16,6 +16,7 @@ std::string_view to_string(Game g) noexcept {
         case Game::Magic:        return "Magic";
         case Game::Pokemon:      return "Pokemon";
         case Game::YuGiOh:       return "YuGiOh";
+        case Game::DigiBattle99: return "DigiBattle99";
     }
     CCM_UNREACHABLE();
 }
@@ -59,6 +60,7 @@ std::optional<Game> gameFromString(std::string_view s) noexcept {
     if (s == "Magic")        return Game::Magic;
     if (s == "Pokemon")      return Game::Pokemon;
     if (s == "YuGiOh")       return Game::YuGiOh;
+    if (s == "DigiBattle99") return Game::DigiBattle99;
     return std::nullopt;
 }
 
@@ -91,8 +93,9 @@ std::optional<Theme> themeFromString(std::string_view s) noexcept {
     return std::nullopt;
 }
 
-const std::array<Game, 3>& allGames() noexcept {
-    static constexpr std::array<Game, 3> v{Game::Magic, Game::Pokemon, Game::YuGiOh};
+const std::array<Game, 4>& allGames() noexcept {
+    static constexpr std::array<Game, 4> v{
+        Game::Magic, Game::Pokemon, Game::YuGiOh, Game::DigiBattle99};
     return v;
 }
 

core/src/games/digibattle99/DigiBattle99CardPreviewSource.cpp

@@ -0,0 +1,222 @@
+#include "ccm/games/digibattle99/DigiBattle99CardPreviewSource.hpp"
+
+#include "ccm/util/Rfc3986.hpp"
+
+#include <nlohmann/json.hpp>
+
+#include <cctype>
+#include <string>
+#include <unordered_set>
+#include <vector>
+
+namespace ccm {
+
+namespace {
+
+std::string trim(std::string s) {
+    while (!s.empty() && std::isspace(static_cast<unsigned char>(s.front()))) s.erase(s.begin());
+    while (!s.empty() && std::isspace(static_cast<unsigned char>(s.back()))) s.pop_back();
+    return s;
+}
+
+std::string toLower(std::string s) {
+    for (char& ch : s) {
+        ch = static_cast<char>(std::tolower(static_cast<unsigned char>(ch)));
+    }
+    return s;
+}
+
+bool cardInPack(const nlohmann::json& card, std::string_view packName) {
+    if (packName.empty()) return true;
+    if (!card.contains("set_name") || !card.at("set_name").is_array()) return false;
+    for (const auto& pack : card.at("set_name")) {
+        if (pack.is_string() && pack.get<std::string>() == packName) return true;
+    }
+    return false;
+}
+
+}  // namespace
+
+DigiBattle99CardPreviewSource::DigiBattle99CardPreviewSource(IHttpClient& http)
+    : http_(http) {}
+
+std::string DigiBattle99CardPreviewSource::normalizeCardNumber(std::string_view setNo) {
+    std::string s = trim(std::string(setNo));
+    if (s.empty()) return s;
+    // Uppercase leading alphabetic prefix (ST / BO / MO / Fx-style).
+    std::size_t i = 0;
+    while (i < s.size() && std::isalpha(static_cast<unsigned char>(s[i]))) {
+        s[i] = static_cast<char>(std::toupper(static_cast<unsigned char>(s[i])));
+        ++i;
+    }
+    return s;
+}
+
+std::string DigiBattle99CardPreviewSource::buildImageUrl(std::string_view setNo) {
+    const std::string id = normalizeCardNumber(setNo);
+    return std::string(kImageBase) + id + ".jpg";
+}
+
+std::string DigiBattle99CardPreviewSource::buildSearchUrl(std::string_view name,
+                                                          std::string_view setName,
+                                                          std::string_view setNo) {
+    std::string url = "https://digimoncard.io/api-public/search.php?series=";
+    url += rfc3986PercentEncode(kSeries);
+    if (!name.empty()) {
+        url += "&n=";
+        url += rfc3986PercentEncode(name);
+    }
+    if (!setName.empty()) {
+        url += "&pack=";
+        url += rfc3986PercentEncode(setName);
+    }
+    const std::string num = normalizeCardNumber(setNo);
+    if (!num.empty()) {
+        url += "&card=";
+        url += rfc3986PercentEncode(num);
+    }
+    url += "&sort=name&sortdirection=asc";
+    return url;
+}
+
+Result<std::string, PreviewLookupError>
+DigiBattle99CardPreviewSource::parseImageUrlFromSearch(const std::string& body,
+                                                       std::string_view wantedCardName) {
+    using R = Result<std::string, PreviewLookupError>;
+    using K = PreviewLookupError::Kind;
+    try {
+        const auto j = nlohmann::json::parse(body);
+        if (j.is_object() && j.contains("error")) {
+            return R::err({K::NotFound, j.value("error", std::string{"No cards found."})});
+        }
+        if (!j.is_array()) {
+            return R::err({K::Transient, "digimoncard.io Digi-Battle response is not a JSON array."});
+        }
+        if (j.empty()) {
+            return R::err({K::NotFound, "digimoncard.io returned no matching Digi-Battle cards."});
+        }
+
+        const std::string wantedLower = toLower(trim(std::string(wantedCardName)));
+        const nlohmann::json* chosen = nullptr;
+        for (const auto& card : j) {
+            if (!wantedLower.empty()) {
+                const std::string cardName = trim(card.value("name", ""));
+                if (toLower(cardName) != wantedLower) continue;
+            }
+            chosen = &card;
+            break;
+        }
+        if (chosen == nullptr) {
+            return R::err({K::NotFound, "digimoncard.io returned no matching Digi-Battle cards."});
+        }
+        const std::string id = normalizeCardNumber(chosen->value("id", ""));
+        if (id.empty()) {
+            return R::err({K::NotFound, "Digi-Battle card has no id / card number."});
+        }
+        return R::ok(buildImageUrl(id));
+    } catch (const std::exception& e) {
+        return R::err({K::Transient,
+            std::string("digimoncard.io Digi-Battle JSON parse error: ") + e.what()});
+    }
+}
+
+Result<std::string, PreviewLookupError>
+DigiBattle99CardPreviewSource::fetchImageUrl(std::string_view name,
+                                             std::string_view setName,
+                                             std::string_view setNo) {
+    using R = Result<std::string, PreviewLookupError>;
+    using K = PreviewLookupError::Kind;
+
+    const std::string num = normalizeCardNumber(setNo);
+    if (!num.empty()) {
+        return R::ok(buildImageUrl(num));
+    }
+    if (name.empty()) {
+        return R::err({K::NotFound, "Digi-Battle preview requires a card name or set number."});
+    }
+
+    const std::string url = buildSearchUrl(name, setName, "");
+    auto resp = http_.get(url);
+    if (!resp) return R::err({K::Transient, resp.error()});
+    return parseImageUrlFromSearch(resp.value(), name);
+}
+
+Result<std::vector<AutoDetectedPrint>> DigiBattle99CardPreviewSource::parsePrintVariants(
+    const std::string& body,
+    std::string_view setName,
+    std::string_view wantedCardName) {
+    using R = Result<std::vector<AutoDetectedPrint>>;
+    try {
+        const auto j = nlohmann::json::parse(body);
+        if (j.is_object() && j.contains("error")) {
+            return R::err(j.value("error", std::string{"No cards found."}));
+        }
+        if (!j.is_array() || j.empty()) {
+            return R::err("digimoncard.io returned no matching Digi-Battle cards.");
+        }
+
+        const std::string wantedPack = trim(std::string(setName));
+        const std::string wantedNameLower = toLower(trim(std::string(wantedCardName)));
+
+        std::vector<AutoDetectedPrint> collected;
+        for (const auto& card : j) {
+            if (!wantedNameLower.empty()) {
+                const std::string cardName = trim(card.value("name", ""));
+                if (toLower(cardName) != wantedNameLower) continue;
+            }
+            if (!cardInPack(card, wantedPack)) continue;
+            AutoDetectedPrint out;
+            out.setNo = normalizeCardNumber(card.value("id", ""));
+            out.rarity = "";  // Digi-Battle UI is Pokémon-like; rarity not persisted.
+            if (out.setNo.empty()) continue;
+            collected.push_back(std::move(out));
+        }
+
+        if (collected.empty()) {
+            if (!wantedNameLower.empty() && !wantedPack.empty()) {
+                return R::err("Could not auto-detect Digi-Battle set print metadata.");
+            }
+            return R::err("digimoncard.io returned no matching Digi-Battle cards.");
+        }
+
+        std::vector<AutoDetectedPrint> deduped;
+        deduped.reserve(collected.size());
+        std::unordered_set<std::string> seen;
+        seen.reserve(collected.size() * 2);
+        for (auto& p : collected) {
+            if (seen.insert(p.setNo).second) deduped.push_back(std::move(p));
+        }
+        return R::ok(std::move(deduped));
+    } catch (const std::exception& e) {
+        return R::err(std::string("digimoncard.io Digi-Battle JSON parse error: ") + e.what());
+    }
+}
+
+Result<AutoDetectedPrint> DigiBattle99CardPreviewSource::detectFirstPrint(
+    std::string_view name,
+    std::string_view setName) {
+    auto list = detectPrintVariants(name, setName);
+    if (!list || list.value().empty()) {
+        if (!list) return Result<AutoDetectedPrint>::err(list.error());
+        return Result<AutoDetectedPrint>::err("Could not auto-detect Digi-Battle set print metadata.");
+    }
+    return Result<AutoDetectedPrint>::ok(list.value().front());
+}
+
+Result<std::vector<AutoDetectedPrint>> DigiBattle99CardPreviewSource::detectPrintVariants(
+    std::string_view name,
+    std::string_view setName) {
+    using R = Result<std::vector<AutoDetectedPrint>>;
+    const std::string url = buildSearchUrl(name, setName, "");
+    auto resp = http_.get(url);
+    if (resp) {
+        return parsePrintVariants(resp.value(), setName, name);
+    }
+    // Retry name-only; still filter by pack in parsePrintVariants.
+    const std::string fallbackUrl = buildSearchUrl(name, "", "");
+    auto fallback = http_.get(fallbackUrl);
+    if (!fallback) return R::err(fallback.error());
+    return parsePrintVariants(fallback.value(), setName, name);
+}
+
+}  // namespace ccm

core/src/games/digibattle99/DigiBattle99GameModule.cpp

@@ -0,0 +1,8 @@
+#include "ccm/games/digibattle99/DigiBattle99GameModule.hpp"
+
+namespace ccm {
+
+DigiBattle99GameModule::DigiBattle99GameModule(IHttpClient& http)
+    : setSource_(http), previewSource_(http) {}
+
+}  // namespace ccm

core/src/games/digibattle99/DigiBattle99SetSource.cpp

@@ -0,0 +1,119 @@
+#include "ccm/games/digibattle99/DigiBattle99SetSource.hpp"
+
+#include <nlohmann/json.hpp>
+
+#include <algorithm>
+#include <cctype>
+#include <string>
+#include <unordered_map>
+#include <unordered_set>
+
+namespace ccm {
+
+namespace {
+
+// Curated EN release dates for the vintage Digi-Battle product line.
+// Series 1 Starter is verified 1999-06-01; other entries use digimoncard.io /
+// checklist years (day unknown -> YYYY/01/01 or mid-year anchors for ordering).
+const std::unordered_map<std::string, std::string>& curatedReleaseDates() {
+    static const std::unordered_map<std::string, std::string> kDates{
+        {"Series 1 Starter Set", "1999/06/01"},
+        {"Series 1 Booster Pack", "1999/06/01"},
+        {"Series 2 Booster Pack", "1999/09/01"},
+        {"Series 3 Booster Pack", "2000/01/01"},
+        {"Series 4 Booster Pack", "2000/06/01"},
+        {"Series 5 Booster Pack", "2000/10/01"},
+        {"Series 6 Booster Pack", "2001/01/01"},
+        {"Street Starter Set 1", "2001/01/01"},
+        {"Street Starter Set 2", "2001/02/01"},
+        {"Street Starter Set 3", "2001/03/01"},
+        {"Street Starter Set 4", "2001/04/01"},
+        {"Digimon The Movie Promo Cards", "2000/10/01"},
+    };
+    return kDates;
+}
+
+std::string releaseDateForPack(const std::string& packName) {
+    const auto& dates = curatedReleaseDates();
+    const auto it = dates.find(packName);
+    if (it != dates.end()) return it->second;
+    return {};
+}
+
+}  // namespace
+
+DigiBattle99SetSource::DigiBattle99SetSource(IHttpClient& http) : http_(http) {}
+
+std::string DigiBattle99SetSource::slugifyPackName(std::string_view packName) {
+    std::string out;
+    out.reserve(packName.size());
+    bool pendingHyphen = false;
+    for (unsigned char ch : packName) {
+        if (std::isalnum(ch)) {
+            if (pendingHyphen && !out.empty()) out.push_back('-');
+            pendingHyphen = false;
+            out.push_back(static_cast<char>(std::tolower(ch)));
+        } else {
+            pendingHyphen = !out.empty();
+        }
+    }
+    return out;
+}
+
+Result<std::vector<Set>> DigiBattle99SetSource::parseResponse(const std::string& body) {
+    try {
+        const auto j = nlohmann::json::parse(body);
+        if (j.is_object() && j.contains("error")) {
+            return Result<std::vector<Set>>::err(
+                j.value("error", std::string{"digimoncard.io set search error"}));
+        }
+        if (!j.is_array()) {
+            return Result<std::vector<Set>>::err(
+                "digimoncard.io Digi-Battle response is not a JSON array.");
+        }
+
+        // Preserve first-seen order of pack names, then sort by release date.
+        std::unordered_set<std::string> seen;
+        std::vector<std::string> packNames;
+        packNames.reserve(16);
+        for (const auto& entry : j) {
+            if (!entry.contains("set_name") || !entry.at("set_name").is_array()) continue;
+            for (const auto& pack : entry.at("set_name")) {
+                if (!pack.is_string()) continue;
+                const std::string name = pack.get<std::string>();
+                if (name.empty()) continue;
+                if (seen.insert(name).second) packNames.push_back(name);
+            }
+        }
+
+        std::vector<Set> out;
+        out.reserve(packNames.size());
+        for (const auto& name : packNames) {
+            Set s;
+            s.id = slugifyPackName(name);
+            s.name = name;
+            s.releaseDate = releaseDateForPack(name);
+            if (s.id.empty()) continue;
+            out.push_back(std::move(s));
+        }
+
+        std::sort(out.begin(), out.end(), [](const Set& a, const Set& b) {
+            if (a.releaseDate.empty() && !b.releaseDate.empty()) return false;
+            if (!a.releaseDate.empty() && b.releaseDate.empty()) return true;
+            if (a.releaseDate != b.releaseDate) return a.releaseDate < b.releaseDate;
+            return a.name < b.name;
+        });
+        return Result<std::vector<Set>>::ok(std::move(out));
+    } catch (const std::exception& e) {
+        return Result<std::vector<Set>>::err(
+            std::string("digimoncard.io Digi-Battle JSON parse error: ") + e.what());
+    }
+}
+
+Result<std::vector<Set>> DigiBattle99SetSource::fetchAll() {
+    auto resp = http_.get(kEndpoint);
+    if (!resp) return Result<std::vector<Set>>::err(resp.error());
+    return parseResponse(resp.value());
+}
+
+}  // namespace ccm

core/src/services/CardFilter.cpp

@@ -67,4 +67,19 @@ bool matchesYuGiOhFilter(const YuGiOhCard& card, std::string_view filter) {
     return false;
 }
 
+bool matchesDigiBattle99Filter(const DigiBattle99Card& card, std::string_view filter) {
+    if (filter.empty()) return true;
+
+    const std::string needle = asciiLower(filter);
+
+    if (containsLower(card.name, needle))                     return true;
+    if (containsLower(card.set.name, needle))                 return true;
+    if (containsLower(card.setNo, needle))                    return true;
+    if (containsLower(to_string(card.language), needle))      return true;
+    if (containsLower(to_string(card.condition), needle))     return true;
+    if (containsLower(std::to_string(card.amount), needle))   return true;
+    if (containsLower(card.note, needle))                     return true;
+    return false;
+}
+
 }  // namespace ccm

core/src/services/CardSorter.cpp

@@ -223,4 +223,74 @@ void sortYuGiOhCards(std::vector<YuGiOhCard>& cards, YuGiOhSortColumn column,
     }
 }
 
+void sortDigiBattle99Cards(std::vector<DigiBattle99Card>& cards,
+                           DigiBattle99SortColumn column,
+                           bool ascending) {
+    switch (column) {
+    case DigiBattle99SortColumn::Name:
+        std::stable_sort(cards.begin(), cards.end(), directional(
+            [](const DigiBattle99Card& a, const DigiBattle99Card& b) {
+                return asciiLower(a.name) < asciiLower(b.name);
+            }, ascending));
+        break;
+    case DigiBattle99SortColumn::SetReleaseDate:
+        std::stable_sort(cards.begin(), cards.end(), directional(
+            [](const DigiBattle99Card& a, const DigiBattle99Card& b) {
+                return asciiLower(a.set.releaseDate) <
+                       asciiLower(b.set.releaseDate);
+            }, ascending));
+        break;
+    case DigiBattle99SortColumn::Language:
+        std::stable_sort(cards.begin(), cards.end(), directional(
+            [](const DigiBattle99Card& a, const DigiBattle99Card& b) {
+                return asciiLower(to_string(a.language)) <
+                       asciiLower(to_string(b.language));
+            }, ascending));
+        break;
+    case DigiBattle99SortColumn::Condition:
+        std::stable_sort(cards.begin(), cards.end(), directional(
+            [](const DigiBattle99Card& a, const DigiBattle99Card& b) {
+                return asciiLower(to_string(a.condition)) <
+                       asciiLower(to_string(b.condition));
+            }, ascending));
+        break;
+    case DigiBattle99SortColumn::Amount:
+        std::stable_sort(cards.begin(), cards.end(), directional(
+            [](const DigiBattle99Card& a, const DigiBattle99Card& b) {
+                return a.amount < b.amount;
+            }, ascending));
+        break;
+    case DigiBattle99SortColumn::Holo:
+        std::stable_sort(cards.begin(), cards.end(), directional(
+            [](const DigiBattle99Card& a, const DigiBattle99Card& b) {
+                return a.holo < b.holo;
+            }, ascending));
+        break;
+    case DigiBattle99SortColumn::FirstEdition:
+        std::stable_sort(cards.begin(), cards.end(), directional(
+            [](const DigiBattle99Card& a, const DigiBattle99Card& b) {
+                return a.firstEdition < b.firstEdition;
+            }, ascending));
+        break;
+    case DigiBattle99SortColumn::Signed:
+        std::stable_sort(cards.begin(), cards.end(), directional(
+            [](const DigiBattle99Card& a, const DigiBattle99Card& b) {
+                return a.signed_ < b.signed_;
+            }, ascending));
+        break;
+    case DigiBattle99SortColumn::Altered:
+        std::stable_sort(cards.begin(), cards.end(), directional(
+            [](const DigiBattle99Card& a, const DigiBattle99Card& b) {
+                return a.altered < b.altered;
+            }, ascending));
+        break;
+    case DigiBattle99SortColumn::Note:
+        std::stable_sort(cards.begin(), cards.end(), directional(
+            [](const DigiBattle99Card& a, const DigiBattle99Card& b) {
+                return asciiLower(a.note) < asciiLower(b.note);
+            }, ascending));
+        break;
+    }
+}
+
 }  // namespace ccm

docs/AGENTS.md

@@ -11,13 +11,13 @@ Long-form contributor documentation that lives outside the source tree.
 - `dow-doc-build-locally.md` — complete local build/setup reference for Windows and Linux, including dependency management and troubleshooting.
 - `intro-to-new-developers.md` — onboarding map for new contributors: architecture, folder responsibilities, guardrails, anti-patterns, and links to deeper docs.
 - `testing-and-test-code-of-conduct.md` — testing workflow plus expected standards for writing and maintaining deterministic, hermetic, behavior-focused tests.
-- `assets-and-info-apis.md` — reference for the external info APIs (set metadata) and asset APIs (card preview images) used by the Magic, Pokémon, and Yu-Gi-Oh! modules, plus the runtime flow through `SetService` / `CardPreviewService`, shared HTTP defaults (`CprHttpClient`, `Accept: */*`), per-game card-back fallbacks (URLs + bundled `ygo_card_back.png`), and error-surface conventions. The Yu-Gi-Oh! **Info API** section also documents the local **set code** lookup used by the edit dialog (`YuGiOhSetLookup`, no extra HTTP).
+- `assets-and-info-apis.md` — reference for the external info APIs (set metadata) and asset APIs (card preview images) used by the Magic, Pokémon, Yu-Gi-Oh!, and Digimon Digi-Battle modules, plus the runtime flow through `SetService` / `CardPreviewService`, shared HTTP defaults (`CprHttpClient`, `Accept: */*`), per-game card-back fallbacks (URLs + bundled `ygo_card_back.png` / `digibattle99_card_back.png`), and error-surface conventions. The Yu-Gi-Oh! **Info API** section also documents the local **set code** lookup used by the edit dialog (`YuGiOhSetLookup`, no extra HTTP).
 - `caching.md` — dedicated reference for preview-byte caching tiers (`CardPreviewService` LRU + `LocalPreviewByteCache`), cache keys and eviction, HTTP session reuse via `CprHttpClient`, and explicit non-goals (no error caching).
 - `README.md` — index page that clusters docs by area and links to all documents in this directory.
 
 ## Subdirectories
 
-- `assets/images/` — static screenshots and other binary assets referenced from the documentation (currently `demo-mtg.png`, `demo-pkm.png`). Keep filenames stable so cross-doc links don't break, and prefer compressed PNG/JPEG over uncompressed formats.
+- `assets/images/` — static screenshots and other binary assets referenced from the documentation (currently `demo-mtg.png`, `demo-pkm.png`, `demo-ygo.png`, `demo-digibattle99.png`). Keep filenames stable so cross-doc links don't break, and prefer compressed PNG/JPEG over uncompressed formats.
 
 ## Conventions
 
@@ -28,7 +28,7 @@ Long-form contributor documentation that lives outside the source tree.
 ## Required follow-ups
 
 - After changing per-game seams in `core/` (e.g. `IGameModule`, `ISetSource`, `ICardPreviewSource`, `CollectionService`, `SetService`, `CardPreviewService`, `ImageService`) you **must** update `adding-a-new-game.md` to keep the canonical procedure in sync. The same applies to the UI seams (`IGameView`, `BaseCardListPanel`, `BaseCardEditDialog`, `BaseSelectedCardPanel`) and the composition-root wiring in `app/main.cpp`.
-- After changing any game's set/preview adapters (`MagicSetSource`, `MagicCardPreviewSource`, `PokemonSetSource`, `PokemonCardPreviewSource`, `YuGiOhSetSource`, `YuGiOhCardPreviewSource`) — endpoints, response parsing, name/number normalization, or the info-vs-asset split — you **must** update `assets-and-info-apis.md` so the API reference matches the live behavior.
+- After changing any game's set/preview adapters (`MagicSetSource`, `MagicCardPreviewSource`, `PokemonSetSource`, `PokemonCardPreviewSource`, `YuGiOhSetSource`, `YuGiOhCardPreviewSource`, `DigiBattle99SetSource`, `DigiBattle99CardPreviewSource`) — endpoints, response parsing, name/number normalization, or the info-vs-asset split — you **must** update `assets-and-info-apis.md` so the API reference matches the live behavior.
 - After bumping a key dependency (`nlohmann/json`, `cpr`, `wxWidgets`, `doctest`) in a way that changes a public API used in the guide's examples, update those examples.
 - After adding a new file under `docs/` (or a new entry under `docs/assets/images/`) you **must** add it to the file list above **and** to `README.md` so the index stays complete.
 - Do **not** rename, move, or split this file without first updating every other `AGENTS.md` that points at it (root, `core/`, `ui_wx/`, `app/`, `tests/`).

docs/README.md

@@ -22,7 +22,7 @@ This folder contains contributor documentation for Card Collection Manager 3. St
 
 - [adding-a-new-game.md](adding-a-new-game.md): canonical end-to-end procedure for adding a new game module across `core/`, `ui_wx/`, and `app/`.
 
-- [assets-and-info-apis.md](assets-and-info-apis.md): external info and asset APIs used by Magic, Pokémon, and Yu-Gi-Oh! modules, preview fallback URLs / bundled YGO card-back asset, and shared HTTP behavior (`CprHttpClient`).
+- [assets-and-info-apis.md](assets-and-info-apis.md): external info and asset APIs used by Magic, Pokémon, Yu-Gi-Oh!, and Digimon Digi-Battle modules, preview fallback URLs / bundled card-back assets, and shared HTTP behavior (`CprHttpClient`).
 
 ## Performance & Caching
 

docs/assets-and-info-apis.md

@@ -78,6 +78,43 @@ Used in two situations:
 
 YGOPRODeck publishes rate limits and asks clients to cache responses and avoid abusive hotlinking; treat failures after burst traffic as an upstream policy signal, not an app bug. Yugipedia’s MediaWiki API is similarly polite — one batched call per preview lookup keeps us well under any normal threshold.
 
+## Digimon Digi-Battle (1999) APIs (digimoncard.io)
+
+English Digi-Battle is wired as `Game::DigiBattle99` (`dirName` `digibattle99`, UI label **Digimon (Digi-Battle)**). Upstream docs: [digimoncard.io Public API](https://digimoncard.io/api-documentation). Always scope requests with `series=Digimon Digi-Battle Card Game` so modern Digimon Card Game rows are never mixed in. Rate limit: **15 requests / 10 seconds / IP** (429 then temporary block on abuse).
+
+### Info API: derived set list from `search.php`
+
+There is **no** dedicated sets endpoint. `DigiBattle99SetSource` calls:
+
+`https://digimoncard.io/api-public/search.php?series=Digimon%20Digi-Battle%20Card%20Game&limit=1000&sort=name&sortdirection=asc`
+
+and collects unique `set_name[]` pack strings. Each pack becomes a `Set` with:
+
+- `Set.name` — exact pack display name (used as `pack=` on search / auto-detect)
+- `Set.id` — stable slug (`Series 1 Starter Set` → `series-1-starter-set`); never rename after ship
+- `Set.releaseDate` — curated table in the set source (Series 1 Starter = `1999/06/01` verified; other packs use documented year/month anchors)
+
+Unknown future packs get an empty release date and sort last.
+
+### Asset API: CDN images + `search.php` lookup
+
+Card scans live at:
+
+`https://images.digimoncard.io/images/cards/{id}.jpg`
+
+where `{id}` is the API card number (`ST-01`, `BO-115`, `MO-06`). The CDN also serves `.webp`, but CCM3 uses `.jpg` because `OnInit` only registers `wxPNGHandler` / `wxJPEGHandler` (WebP bytes would surface as “image decode failed”).
+
+`DigiBattle99CardPreviewSource::fetchImageUrl`:
+
+1. If `setNo` is non-empty → normalize alphabetic prefix to uppercase (**no** invented zero-padding) and return the CDN URL with **no** search round-trip.
+2. Otherwise search with `n=` + optional `pack=` (display set name) + `series=`, take the first exact name match’s `id`, then build the CDN URL.
+
+**Preview key:** `(name, set.name, setNo)` — middle slot is the pack **display name** (same idea as Yu-Gi-Oh! passing `set.name` for YGOPRODeck `cardset=`), not the slug id.
+
+**Auto-detect** (`detectPrintVariants`): same search; distinct `id` values become `AutoDetectedPrint::setNo`. Digi-Battle UI is Pokémon-like (no persisted rarity).
+
+Empty search array / `{"error":"..."}` → `NotFound`; bad JSON / HTTP → `Transient`.
+
 ## Runtime Flow In CCM3
 
 The app uses the same flow for every game that registers a module:
@@ -91,15 +128,15 @@ The app uses the same flow for every game that registers a module:
 
 See [caching.md](caching.md) for a dedicated reference on preview cache tiers, internal keys, eviction, clearing, and HTTP session reuse.
 
-Three mechanisms reduce preview latency for **all** games (Magic, Pokemon, Yu-Gi-Oh!). In addition, the shared HTTP session speeds **every** `IHttpClient::get` call (including set-list fetches), not only previews:
+Three mechanisms reduce preview latency for **all** games (Magic, Pokemon, Yu-Gi-Oh!, DigiBattle99). In addition, the shared HTTP session speeds **every** `IHttpClient::get` call (including set-list fetches), not only previews:
 
 - **In-memory preview LRU** (`CardPreviewService`). Successful `fetchPreviewBytes` results are cached keyed by `(game, name, setId, setNo)`; successful `fetchImageBytesByUrl` results are cached keyed by URL (used for the per-game card-back fallback). Re-selecting a previously viewed row is decode-only — no HTTP at all. The cache is bounded by `CardPreviewService::kCacheCapacity` (currently 128 entries) and uses a list+map LRU under a mutex (the preview pipeline is invoked from a worker thread in `BaseSelectedCardPanel`). **Source errors are split** by `PreviewLookupError::Kind`: `NotFound` (the upstream answered cleanly that the record has no image) is *negative-cached* in this tier so subsequent selections short-circuit without HTTP, while `Transient` (HTTP/network/parse failures) is **never** cached so a brief outage cannot permanently disable a card's preview.
 - **Persistent disk byte cache** (`LocalPreviewByteCache`, port `IPreviewByteCache`). Wraps the in-memory tier with an on-disk store under `<exeDir>/.cache/preview-cache/` — pinned **next to the executable**, in the same scope as `config.json`, **not** under the user-configurable `Configuration.dataStorage` path. The cache stays put when the user reconfigures or relocates their collection data, and it is not part of the user's data directory backups; it is install-scoped, not collection-scoped. Both positive previews and `NotFound` verdicts survive an app restart. Each entry is a mutually-exclusive `<hash>.bin` (positive payload) or `<hash>.neg` (negative marker) plus a `<hash>.idx` sidecar containing the original key — load-time mismatch on the sidecar treats the entry as a miss, so a hash collision degrades to a one-time HTTP refetch instead of serving the wrong card's bytes (or the wrong card's "no image" verdict). Hashing is FNV-1a 64-bit (no crypto dependency). The cache is bounded by total `.bin` payload bytes (default `kDefaultMaxBytes = 64 MiB`) and evicts oldest entries by mtime when a new write would exceed the cap; reading an entry touches its mtime so frequently-viewed cards survive eviction. Negative `.neg` markers are tiny and not counted against the cap — their count is naturally bounded by the user's actively-viewed records. Filesystem mutations route through `IFileSystem`; size and mtime queries (which the port does not expose) use `std::filesystem` directly inside the adapter. The persistent tier is **fire-and-forget on the way down** — every adapter operation swallows I/O errors so a flaky or full disk never breaks the preview path.
-- **Persistent HTTP session** (`CprHttpClient`). The adapter owns one long-lived `cpr::Session` (libcurl easy handle) for the lifetime of the app. Per-request configuration is limited to `SetUrl(...)`; headers, timeout, and redirect policy are configured once in the constructor. Default **`Accept: */*`** keeps JSON responses and raw image bodies working on the same session (avoid tying every GET to `application/json`). libcurl's connection pool keeps the TLS connection to each host warm, so repeat calls to `api.scryfall.com`, `api.pokemontcg.io`, `db.ygoprodeck.com`, `yugipedia.com`, and `ms.yugipedia.com` skip the TLS handshake. A `std::mutex` serializes callers — libcurl easy handles are not thread-safe, and the preview pipeline is single-flight per panel anyway.
+- **Persistent HTTP session** (`CprHttpClient`). The adapter owns one long-lived `cpr::Session` (libcurl easy handle) for the lifetime of the app. Per-request configuration is limited to `SetUrl(...)`; headers, timeout, and redirect policy are configured once in the constructor. Default **`Accept: */*`** keeps JSON responses and raw image bodies working on the same session (avoid tying every GET to `application/json`). libcurl's connection pool keeps the TLS connection to each host warm, so repeat calls to `api.scryfall.com`, `api.pokemontcg.io`, `db.ygoprodeck.com`, `yugipedia.com`, `ms.yugipedia.com`, `digimoncard.io`, and `images.digimoncard.io` skip the TLS handshake. A `std::mutex` serializes callers — libcurl easy handles are not thread-safe, and the preview pipeline is single-flight per panel anyway.
 
 `CardPreviewService` consults the tiers in order **memory → disk → source/HTTP**. On a disk hit (positive *or* negative) the entry is promoted into the in-memory LRU so the next click on the same row never re-touches the disk cache. On HTTP success the bytes are written through to both tiers in one shot. On a `NotFound` source error the **negative** marker is written through to both tiers; on `Transient` source errors nothing is written, so the next selection retries cleanly.
 
-The combined effect on the preview path: first selection of a previously-unseen card pays one TLS handshake per *new* host this session (typically two hops for Yu-Gi-Oh!: `yugipedia.com` for the API, `ms.yugipedia.com` for the image), each subsequent fresh card on the same host skips the handshake, any re-selection of an already-viewed card is instant, after the first run with the disk cache populated **even a fresh app launch is decode-only for previously-seen cards** until eviction or a manual cache clear, and **records the upstream cleanly has no image for** stay "instant card-back" across restarts instead of re-paying the lookup every launch. Editing a lookup-relevant field of a record (name, set, setNo, or for Yu-Gi-Oh! the rarity / edition packed into setNo) changes the cache key automatically, so a fresh resolution attempt happens on the next click.
+The combined effect on the preview path: first selection of a previously-unseen card pays one TLS handshake per *new* host this session (typically two hops for Yu-Gi-Oh!: `yugipedia.com` for the API, `ms.yugipedia.com` for the image; Digi-Battle often hits `images.digimoncard.io` only when `setNo` is already known), each subsequent fresh card on the same host skips the handshake, any re-selection of an already-viewed card is instant, after the first run with the disk cache populated **even a fresh app launch is decode-only for previously-seen cards** until eviction or a manual cache clear, and **records the upstream cleanly has no image for** stay "instant card-back" across restarts instead of re-paying the lookup every launch. Editing a lookup-relevant field of a record (name, set, setNo, or for Yu-Gi-Oh! the rarity / edition packed into setNo) changes the cache key automatically, so a fresh resolution attempt happens on the next click.
 
 To clear the persistent cache (for example to recover from a bad upstream image), delete the `<exeDir>/.cache/preview-cache/` subdirectory or the umbrella `<exeDir>/.cache/` folder. Note: the in-app "Reset" / data-storage-relocation flow does **not** touch this directory — the cache is install-scoped, not collection-scoped, so it is preserved across data-dir moves and only cleared by deleting the directory above explicitly (or by reinstalling / relocating the executable).
 
@@ -110,6 +147,7 @@ Fallback card-back sources (`BaseSelectedCardPanel`; Magic/Pokémon URLs match C
 - Magic: `https://gamepedia.cursecdn.com/mtgsalvation_gamepedia/f/f8/Magic_card_back.jpg`
 - Pokémon: `https://archives.bulbagarden.net/media/upload/1/17/Cardback.jpg`
 - Yu-Gi-Oh!: Yugipedia English TCG back — try `https://ms.yugipedia.com/thumb/e/e5/Back-EN.png/250px-Back-EN.png`, then `https://ms.yugipedia.com/e/e5/Back-EN.png`; if both fail, load `<exeDir>/assets/ygo_card_back.png` (shipped from `ui_wx/assets/ygo_card_back.png` at link time). `fallbackImageUrlForGame(Game::YuGiOh)` returns the thumbnail URL for helpers that only consult a single string.
+- Digimon (Digi-Battle): no stable public back URL; load `<exeDir>/assets/digibattle99_card_back.png` (shipped from `ui_wx/assets/digibattle99_card_back.png` at link time).
 
 If a game module does not provide a preview source (`cardPreviewSource() == nullptr`), preview registration is skipped and the UI behaves as "no remote preview API available."
 
@@ -120,6 +158,6 @@ All source types return `Result<T, std::string>` errors so failures cross bounda
 - info API failures (bad set payload, schema mismatch, endpoint/network failure), and
 - asset API failures (query mismatch, no matching card, missing image fields, image download failure).
 
-When previews fail, verify request construction first (name sanitization, number normalization, percent encoding), then verify response shape assumptions: Scryfall (`data`, `image_uris`), Pokemon (`data`, `images.large`/`images.small`; auto-detect also needs `name`, `number`, `rarity`, and `set.id` on each matching row), Yu-Gi-Oh! Yugipedia (`query.pages.<id>.imageinfo[0].url` per filename, missing files tagged `"missing": ""`), Yu-Gi-Oh! YGOPRODeck fallback (`data`, `name`, `card_images`). If the UI fallback path succeeds (network card-back and/or bundled PNG), the panel shows the card-back image and the inline label `(image preview unavailable)`; only if every fallback fails does the preview stay empty with status text.
+When previews fail, verify request construction first (name sanitization, number normalization, percent encoding), then verify response shape assumptions: Scryfall (`data`, `image_uris`), Pokemon (`data`, `images.large`/`images.small`; auto-detect also needs `name`, `number`, `rarity`, and `set.id` on each matching row), Yu-Gi-Oh! Yugipedia (`query.pages.<id>.imageinfo[0].url` per filename, missing files tagged `"missing": ""`), Yu-Gi-Oh! YGOPRODeck fallback (`data`, `name`, `card_images`), Digi-Battle digimoncard.io (top-level array with `name`/`id`/`set_name`; CDN `images.digimoncard.io/images/cards/{id}.jpg`). If the UI fallback path succeeds (network card-back and/or bundled PNG), the panel shows the card-back image and the inline label `(image preview unavailable)`; only if every fallback fails does the preview stay empty with status text.
 
 For Yu-Gi-Oh! specifically, when a printing shows the wrong art compared with Yugipedia’s gallery, debug in this order: (1) verify the candidate list via `YuGiOhCardPreviewSource::buildCandidateFilenames(...)` against the actual file names on Yugipedia’s `Card_Gallery:<Card>` page; (2) confirm the dialog rarity name maps to the expected short code in `ygoRarityShortCode(...)` / `rarityCodeFor(...)` (extend the mapping when a new rarity surfaces); (3) confirm the `firstEdition` flag matches the printed edition stamp — the candidate ordering puts the printed edition first.

docs/caching.md

@@ -68,7 +68,7 @@ There is no explicit "refresh" or "invalidate" API on `CardPreviewService` — b
 
 ### 1. Edit-driven invalidation (record changed → fresh lookup, automatic)
 
-The cache key for the preview path is `(game, name, setId, setNo)`. For Yu-Gi-Oh! the third slot also encodes rarity and edition, packed by `YuGiOhSelectedCardPanel::previewKey()` as `<setNo>||<rarity>||<1E|UE>`. The user editing **any** lookup-relevant field of a card record produces a **different cache key** for the resulting selection, which means:
+The cache key for the preview path is `(game, name, setId, setNo)`. For Yu-Gi-Oh! the third slot also encodes rarity and edition, packed by `YuGiOhSelectedCardPanel::previewKey()` as `<setNo>||<rarity>||<1E|UE>`. For Digimon Digi-Battle the middle slot is the pack **display name** (`Set.name`), not the slug id, so `pack=` search and the CDN path stay aligned. The user editing **any** lookup-relevant field of a card record produces a **different cache key** for the resulting selection, which means:
 
 - Memory and disk lookups for the new key **miss** the old entry (positive or negative).
 - A fresh `ICardPreviewSource::fetchImageUrl` call runs.

tests/AGENTS.md

@@ -21,9 +21,11 @@
 - `std_file_system_tests.cpp` — `StdFileSystem` directly (`exists`, `isDirectory`, `ensureDirectory`, `readText`, `writeText`, `copyFile`, `remove`, `listDirectory`) under a unique `temp_directory_path()/ccm_std_fs_test_*` directory per case; scope matches the real-disk exception documented for preview-cache tests.
 - `pokemon_set_source_tests.cpp` — `PokemonSetSource::parseResponse` (api.pokemontcg.io/v2/sets shape — `data[].id`, `name`, `releaseDate` already in `YYYY/MM/DD`) + sort-by-release-date stability. Drives `fetchAll` via `FixedHttpClient` and asserts the public endpoint URL.
 - `pokemon_card_preview_source_tests.cpp` — `PokemonCardPreviewSource::buildSearchUrl` (percent-encoded `name:` / `set.id:` / `number:` triple, with collector-number `4/102` -> `4` normalization) + `parseResponse` (`data[0].images.large` with `images.small` fallback). Drives `fetchImageUrl` via `FixedHttpClient`.
+- `digibattle99_set_source_tests.cpp` — `DigiBattle99SetSource::parseResponse` derives unique packs from digimoncard.io search arrays, slugifies `Set.id`, applies curated release dates, and sorts chronologically. Drives `fetchAll` via `FixedHttpClient`.
+- `digibattle99_card_preview_source_tests.cpp` — CDN image URL from `setNo`, search URL encoding (`series`/`n`/`pack`/`card`), `parseImageUrlFromSearch` NotFound vs Transient, and auto-detect print variants. Drives `fetchImageUrl` / `detectPrintVariants` via `FixedHttpClient`.
 - `yugioh_set_source_tests.cpp` — `YuGiOhSetSource::parseResponse` for YGOPRODeck `cardsets.php` (`set_code`, `set_name`, `tcg_date`) including `YYYY-MM-DD` -> `YYYY/MM/DD` rewrite and chronological sort checks.
 - `yugioh_set_lookup_tests.cpp` — `lookupYuGiOhSetByShorthand` / helpers in `ccm/util/YuGiOhSetLookup.hpp` (trim, ASCII case-fold, exact `Set.id` match, not-found vs ambiguous).
-- `game_module_tests.cpp` — smoke tests that each concrete `IGameModule` (Magic / Pokemon / Yu-Gi-Oh) reports stable `id()`, `dirName()`, `displayName()`, and a non-null `cardPreviewSource()` when constructed with a noop `IHttpClient`.
+- `game_module_tests.cpp` — smoke tests that each concrete `IGameModule` (Magic / Pokemon / Yu-Gi-Oh / DigiBattle99) reports stable `id()`, `dirName()`, `displayName()`, and a non-null `cardPreviewSource()` when constructed with a noop `IHttpClient`.
 - `yugioh_card_preview_source_tests.cpp` — `YuGiOhCardPreviewSource` Yugipedia + YGOPRODeck unit coverage. Helper-level tests pin down `normalizeName` (whitespace + Yugipedia-policy punctuation stripping), `ygoRarityShortCode` + `rarityCodeFor` (CCM3 dialog rarity names → canonical short codes used by both the YGO overview table and Yugipedia filename generation; unknown rarity falls through), `extractSetCode` (`LOB-005` / `LOB-DE005` → `LOB`), `buildCandidateFilenames` (printed-edition first, EN/NA/EU/AU + png/jpg, rarity-less fallback round, empty list when slug or set code is missing), `buildYugipediaQueryUrl` (single `titles=File:A|File:B` batch, percent-encoded), and `parseYugipediaResponse` (returns the URL of the highest-priority filename that resolved, errors when every candidate is `missing`). End-to-end `fetchImageUrl` cases use a `RoutingHttpClient` to verify Yugipedia is queried first and the per-printing scan is returned when found, that empty/error Yugipedia responses fall through to the YGOPRODeck `card_images[0]` fallback, that the YGOPRODeck error is propagated when both upstreams fail, and that an empty `setNo` skips Yugipedia entirely. `parseFirstPrint` preferred-`set_name` lookup is also covered for the auto-detect path. `parsePrintVariants` includes synthetic scenarios aligned with the `yugioh_same_card_set_variant_tests` fixture (dual-rarity vs multi-code within one display set, duplicate suppression, and no merge across unrelated `set_name` rows when the picker label matches nothing).
 - `card_sorter_tests.cpp` — `sortMagicCards` / `sortPokemonCards` per-column behavior. Pin-down tests for `byField`-equivalent semantics: case-insensitive strings, chronological set sort via `set.releaseDate`, numeric `amount`, `false < true` boolean order, stable composition (sort by name then by set keeps inner-name order). Update this file whenever you add a new column / sort key.
 - `card_filter_tests.cpp` — `matchesMagicFilter` / `matchesPokemonFilter` / `matchesYuGiOhFilter` row-matcher behavior. Pin-down tests for `applyFilter`-equivalent semantics: case-insensitive substring match across `tableFields` valueKeys (name, set.name, language, condition, amount-as-string, note; Pokemon adds `setNo`; Yu-Gi-Oh adds `setNo` + `rarity`), boolean flag columns intentionally excluded, empty filter matches everything. Update this file whenever you add a new searchable column.

tests/CMakeLists.txt

@@ -21,6 +21,8 @@ add_executable(ccm_core_tests
     std_file_system_tests.cpp
     pokemon_set_source_tests.cpp
     pokemon_card_preview_source_tests.cpp
+    digibattle99_set_source_tests.cpp
+    digibattle99_card_preview_source_tests.cpp
     icard_preview_source_tests.cpp
     yugioh_set_source_tests.cpp
     yugioh_set_lookup_tests.cpp

tests/card_filter_tests.cpp

@@ -6,6 +6,7 @@
 #include <doctest/doctest.h>
 
 #include "ccm/domain/Enums.hpp"
+#include "ccm/domain/DigiBattle99Card.hpp"
 #include "ccm/domain/MagicCard.hpp"
 #include "ccm/domain/PokemonCard.hpp"
 #include "ccm/domain/YuGiOhCard.hpp"
@@ -238,3 +239,40 @@ TEST_SUITE("CardFilter::matchesYuGiOhFilter") {
         CHECK_FALSE(matchesYuGiOhFilter(c, "zzznomatch"));
     }
 }
+
+TEST_SUITE("CardFilter::matchesDigiBattle99Filter") {
+    TEST_CASE("matches by name and set.name") {
+        DigiBattle99Card c;
+        c.name = "Agumon";
+        c.set.name = "Series 1 Starter Set";
+        CHECK(matchesDigiBattle99Filter(c, "agu"));
+        CHECK(matchesDigiBattle99Filter(c, "STARTER"));
+        CHECK_FALSE(matchesDigiBattle99Filter(c, "greymon"));
+    }
+
+    TEST_CASE("includes setNo in searchable columns") {
+        DigiBattle99Card c;
+        c.name = "Agumon";
+        c.set.name = "Series 1 Starter Set";
+        c.setNo = "ST-01";
+        CHECK(matchesDigiBattle99Filter(c, "st-01"));
+        CHECK(matchesDigiBattle99Filter(c, "ST-"));
+    }
+
+    TEST_CASE("empty filter matches everything") {
+        DigiBattle99Card c;
+        c.name = "Agumon";
+        CHECK(matchesDigiBattle99Filter(c, ""));
+    }
+
+    TEST_CASE("boolean flag columns are not matched") {
+        DigiBattle99Card c;
+        c.name = "Agumon";
+        c.holo = true;
+        c.firstEdition = true;
+        c.signed_ = true;
+        c.altered = true;
+        CHECK_FALSE(matchesDigiBattle99Filter(c, "true"));
+        CHECK(matchesDigiBattle99Filter(c, "agu"));
+    }
+}

tests/card_sorter_tests.cpp

@@ -6,6 +6,7 @@
 #include <doctest/doctest.h>
 
 #include "ccm/domain/Enums.hpp"
+#include "ccm/domain/DigiBattle99Card.hpp"
 #include "ccm/domain/MagicCard.hpp"
 #include "ccm/domain/PokemonCard.hpp"
 #include "ccm/domain/YuGiOhCard.hpp"
@@ -94,6 +95,30 @@ YuGiOhCard yc(std::uint32_t id, std::string name,
     return c;
 }
 
+DigiBattle99Card db(std::uint32_t id, std::string name,
+                    std::string setName, std::string releaseDate,
+                    std::uint8_t amount = 1,
+                    bool holo = false, bool firstEdition = false,
+                    bool sgnd = false, bool altered = false,
+                    Language lang = Language::English,
+                    Condition cond = Condition::NearMint,
+                    std::string note = "") {
+    DigiBattle99Card c;
+    c.id = id;
+    c.name = std::move(name);
+    c.set.name = std::move(setName);
+    c.set.releaseDate = std::move(releaseDate);
+    c.amount = amount;
+    c.holo = holo;
+    c.firstEdition = firstEdition;
+    c.signed_ = sgnd;
+    c.altered = altered;
+    c.language = lang;
+    c.condition = cond;
+    c.note = std::move(note);
+    return c;
+}
+
 std::vector<std::uint32_t> ids(const std::vector<MagicCard>& v) {
     std::vector<std::uint32_t> out;
     out.reserve(v.size());
@@ -115,6 +140,13 @@ std::vector<std::uint32_t> ids(const std::vector<YuGiOhCard>& v) {
     return out;
 }
 
+std::vector<std::uint32_t> ids(const std::vector<DigiBattle99Card>& v) {
+    std::vector<std::uint32_t> out;
+    out.reserve(v.size());
+    for (const auto& c : v) out.push_back(c.id);
+    return out;
+}
+
 }  // namespace
 
 TEST_SUITE("CardSorter - Magic columns") {
@@ -451,3 +483,35 @@ TEST_SUITE("CardSorter - YuGiOh columns") {
         CHECK(ids(v) == std::vector<std::uint32_t>{3, 1, 2});
     }
 }
+
+TEST_SUITE("CardSorter - DigiBattle99 columns") {
+    TEST_CASE("Holo and FirstEdition sort false before true") {
+        std::vector<DigiBattle99Card> v = {
+            db(1, "a", "X", "2000/01/01", 1, /*holo=*/true, /*first=*/false),
+            db(2, "b", "X", "2000/01/01", 1, /*holo=*/false, /*first=*/true),
+            db(3, "c", "X", "2000/01/01", 1, /*holo=*/false, /*first=*/false),
+        };
+        sortDigiBattle99Cards(v, DigiBattle99SortColumn::Holo, /*ascending=*/true);
+        CHECK(ids(v) == std::vector<std::uint32_t>{2, 3, 1});
+        sortDigiBattle99Cards(v, DigiBattle99SortColumn::FirstEdition, /*ascending=*/true);
+        CHECK(ids(v) == std::vector<std::uint32_t>{3, 1, 2});
+    }
+
+    TEST_CASE("Set column sorts by release date") {
+        std::vector<DigiBattle99Card> v = {
+            db(1, "x", "Late", "2001/01/01"),
+            db(2, "y", "Early", "1999/06/01"),
+        };
+        sortDigiBattle99Cards(v, DigiBattle99SortColumn::SetReleaseDate, /*ascending=*/true);
+        CHECK(ids(v) == std::vector<std::uint32_t>{2, 1});
+    }
+
+    TEST_CASE("Name sorts case-insensitively") {
+        std::vector<DigiBattle99Card> v = {
+            db(1, "greymon", "X", "2000/01/01"),
+            db(2, "Agumon", "X", "2000/01/01"),
+        };
+        sortDigiBattle99Cards(v, DigiBattle99SortColumn::Name, /*ascending=*/true);
+        CHECK(ids(v) == std::vector<std::uint32_t>{2, 1});
+    }
+}

tests/digibattle99_card_preview_source_tests.cpp

@@ -0,0 +1,179 @@
+#include <doctest/doctest.h>
+
+#include "ccm/games/digibattle99/DigiBattle99CardPreviewSource.hpp"
+#include "ccm/ports/IHttpClient.hpp"
+
+#include <string>
+
+using namespace ccm;
+
+namespace {
+
+class FixedHttpClient final : public IHttpClient {
+public:
+    std::string lastUrl;
+    std::string body;
+    bool ok = true;
+    Result<std::string> get(std::string_view url) override {
+        lastUrl = std::string(url);
+        return ok ? Result<std::string>::ok(body)
+                  : Result<std::string>::err("offline");
+    }
+};
+
+}  // namespace
+
+TEST_SUITE("DigiBattle99CardPreviewSource::normalizeCardNumber") {
+    TEST_CASE("uppercases alphabetic prefix without zero-padding") {
+        CHECK(DigiBattle99CardPreviewSource::normalizeCardNumber("bo-88") == "BO-88");
+        CHECK(DigiBattle99CardPreviewSource::normalizeCardNumber("st-01") == "ST-01");
+        CHECK(DigiBattle99CardPreviewSource::normalizeCardNumber("  MO-06 ") == "MO-06");
+    }
+}
+
+TEST_SUITE("DigiBattle99CardPreviewSource::buildImageUrl") {
+    TEST_CASE("builds CDN jpeg URL from card id") {
+        CHECK(DigiBattle99CardPreviewSource::buildImageUrl("ST-01") ==
+              "https://images.digimoncard.io/images/cards/ST-01.jpg");
+        CHECK(DigiBattle99CardPreviewSource::buildImageUrl("bo-115") ==
+              "https://images.digimoncard.io/images/cards/BO-115.jpg");
+    }
+}
+
+TEST_SUITE("DigiBattle99CardPreviewSource::buildSearchUrl") {
+    TEST_CASE("percent-encodes name pack and series") {
+        const auto url = DigiBattle99CardPreviewSource::buildSearchUrl(
+            "Agumon", "Series 1 Starter Set", "");
+        CHECK(url.find("https://digimoncard.io/api-public/search.php?series=") == 0);
+        CHECK(url.find("Digimon%20Digi-Battle%20Card%20Game") != std::string::npos);
+        CHECK(url.find("&n=Agumon") != std::string::npos);
+        CHECK(url.find("&pack=Series%201%20Starter%20Set") != std::string::npos);
+        CHECK(url.find("&card=") == std::string::npos);
+    }
+
+    TEST_CASE("includes card= when setNo is present") {
+        const auto url = DigiBattle99CardPreviewSource::buildSearchUrl(
+            "Agumon", "Series 1 Starter Set", "st-01");
+        CHECK(url.find("&card=ST-01") != std::string::npos);
+    }
+
+    TEST_CASE("empty pack omits pack clause") {
+        const auto url =
+            DigiBattle99CardPreviewSource::buildSearchUrl("Agumon", "", "ST-01");
+        CHECK(url.find("&pack=") == std::string::npos);
+        CHECK(url.find("&card=ST-01") != std::string::npos);
+    }
+}
+
+TEST_SUITE("DigiBattle99CardPreviewSource::parseImageUrlFromSearch") {
+    TEST_CASE("returns CDN URL for first exact name match") {
+        const std::string json = R"([
+            {"name":"Agumon","id":"ST-01","set_name":["Series 1 Starter Set"]},
+            {"name":"Agumon","id":"BO-115","set_name":["Series 1 Booster Pack"]}
+        ])";
+        const auto out =
+            DigiBattle99CardPreviewSource::parseImageUrlFromSearch(json, "Agumon");
+        REQUIRE(out.isOk());
+        CHECK(out.value() == "https://images.digimoncard.io/images/cards/ST-01.jpg");
+    }
+
+    TEST_CASE("empty array is NotFound") {
+        const auto out =
+            DigiBattle99CardPreviewSource::parseImageUrlFromSearch("[]", "Agumon");
+        REQUIRE(out.isErr());
+        CHECK(out.error().kind == PreviewLookupError::Kind::NotFound);
+    }
+
+    TEST_CASE("API error object is NotFound") {
+        const auto out = DigiBattle99CardPreviewSource::parseImageUrlFromSearch(
+            R"({"error":"No cards found for this search."})", "Agumon");
+        REQUIRE(out.isErr());
+        CHECK(out.error().kind == PreviewLookupError::Kind::NotFound);
+    }
+
+    TEST_CASE("non-array is Transient") {
+        const auto out =
+            DigiBattle99CardPreviewSource::parseImageUrlFromSearch(R"({"meta":{}})", "Agumon");
+        REQUIRE(out.isErr());
+        CHECK(out.error().kind == PreviewLookupError::Kind::Transient);
+    }
+
+    TEST_CASE("malformed JSON is Transient") {
+        const auto out =
+            DigiBattle99CardPreviewSource::parseImageUrlFromSearch("{not json", "Agumon");
+        REQUIRE(out.isErr());
+        CHECK(out.error().kind == PreviewLookupError::Kind::Transient);
+    }
+}
+
+TEST_SUITE("DigiBattle99CardPreviewSource::fetchImageUrl") {
+    TEST_CASE("setNo present skips HTTP and returns CDN URL") {
+        FixedHttpClient http;
+        DigiBattle99CardPreviewSource src{http};
+        const auto out = src.fetchImageUrl("Agumon", "Series 1 Starter Set", "st-01");
+        REQUIRE(out.isOk());
+        CHECK(out.value() == "https://images.digimoncard.io/images/cards/ST-01.jpg");
+        CHECK(http.lastUrl.empty());
+    }
+
+    TEST_CASE("empty setNo searches and parses") {
+        FixedHttpClient http;
+        http.body = R"([{"name":"Agumon","id":"ST-01","set_name":["Series 1 Starter Set"]}])";
+        DigiBattle99CardPreviewSource src{http};
+        const auto out = src.fetchImageUrl("Agumon", "Series 1 Starter Set", "");
+        REQUIRE(out.isOk());
+        CHECK(out.value() == "https://images.digimoncard.io/images/cards/ST-01.jpg");
+        CHECK(http.lastUrl.find("search.php") != std::string::npos);
+        CHECK(http.lastUrl.find("n=Agumon") != std::string::npos);
+    }
+
+    TEST_CASE("HTTP failure is Transient") {
+        FixedHttpClient http;
+        http.ok = false;
+        DigiBattle99CardPreviewSource src{http};
+        const auto out = src.fetchImageUrl("Agumon", "Series 1 Starter Set", "");
+        REQUIRE(out.isErr());
+        CHECK(out.error().kind == PreviewLookupError::Kind::Transient);
+    }
+}
+
+TEST_SUITE("DigiBattle99CardPreviewSource::parsePrintVariants") {
+    TEST_CASE("collects distinct card ids for name+pack") {
+        const std::string json = R"([
+            {"name":"Agumon","id":"ST-01","set_name":["Series 1 Starter Set"]},
+            {"name":"Agumon","id":"ST-01","set_name":["Series 1 Starter Set"]},
+            {"name":"Agumon","id":"BO-115","set_name":["Series 1 Booster Pack"]},
+            {"name":"Greymon","id":"ST-02","set_name":["Series 1 Starter Set"]}
+        ])";
+        const auto out = DigiBattle99CardPreviewSource::parsePrintVariants(
+            json, "Series 1 Starter Set", "Agumon");
+        REQUIRE(out.isOk());
+        REQUIRE(out.value().size() == 1);
+        CHECK(out.value()[0].setNo == "ST-01");
+    }
+
+    TEST_CASE("pack miss with exact name returns error") {
+        const std::string json = R"([
+            {"name":"Agumon","id":"BO-115","set_name":["Series 1 Booster Pack"]}
+        ])";
+        const auto out = DigiBattle99CardPreviewSource::parsePrintVariants(
+            json, "Series 1 Starter Set", "Agumon");
+        CHECK(out.isErr());
+    }
+}
+
+TEST_SUITE("DigiBattle99CardPreviewSource::detectPrintVariants") {
+    TEST_CASE("round-trips through FixedHttpClient") {
+        FixedHttpClient http;
+        http.body = R"([
+            {"name":"Agumon","id":"ST-01","set_name":["Series 1 Starter Set"]},
+            {"name":"Agumon","id":"ST-126","set_name":["Series 1 Starter Set"]}
+        ])";
+        DigiBattle99CardPreviewSource src{http};
+        const auto out = src.detectPrintVariants("Agumon", "Series 1 Starter Set");
+        REQUIRE(out.isOk());
+        REQUIRE(out.value().size() == 2);
+        CHECK(out.value()[0].setNo == "ST-01");
+        CHECK(out.value()[1].setNo == "ST-126");
+    }
+}

tests/digibattle99_set_source_tests.cpp

@@ -0,0 +1,112 @@
+#include <doctest/doctest.h>
+
+#include "ccm/games/digibattle99/DigiBattle99SetSource.hpp"
+#include "ccm/ports/IHttpClient.hpp"
+
+using namespace ccm;
+
+namespace {
+
+class FixedHttpClient final : public IHttpClient {
+public:
+    std::string lastUrl;
+    std::string body;
+    bool ok = true;
+    Result<std::string> get(std::string_view url) override {
+        lastUrl = std::string(url);
+        return ok ? Result<std::string>::ok(body)
+                  : Result<std::string>::err("offline");
+    }
+};
+
+}  // namespace
+
+TEST_SUITE("DigiBattle99SetSource::slugifyPackName") {
+    TEST_CASE("slugifies pack display names") {
+        CHECK(DigiBattle99SetSource::slugifyPackName("Series 1 Starter Set") ==
+              "series-1-starter-set");
+        CHECK(DigiBattle99SetSource::slugifyPackName("Digimon The Movie Promo Cards") ==
+              "digimon-the-movie-promo-cards");
+    }
+}
+
+TEST_SUITE("DigiBattle99SetSource::parseResponse") {
+    TEST_CASE("derives unique packs with curated release dates") {
+        const std::string json = R"([
+            {"name":"Agumon","id":"ST-01","set_name":["Series 1 Starter Set"]},
+            {"name":"MetalGreymon","id":"BO-01","set_name":["Series 1 Booster Pack"]},
+            {"name":"Agumon","id":"ST-126","set_name":["Series 1 Starter Set"]},
+            {"name":"Promo","id":"MO-06","set_name":["Digimon The Movie Promo Cards"]}
+        ])";
+
+        const auto out = DigiBattle99SetSource::parseResponse(json);
+        REQUIRE(out.isOk());
+        REQUIRE(out.value().size() == 3);
+        // Same curated date for Series 1 products → secondary sort by name:
+        // "Booster" before "Starter".
+        CHECK(out.value()[0].id == "series-1-booster-pack");
+        CHECK(out.value()[0].name == "Series 1 Booster Pack");
+        CHECK(out.value()[0].releaseDate == "1999/06/01");
+        CHECK(out.value()[1].id == "series-1-starter-set");
+        CHECK(out.value()[1].name == "Series 1 Starter Set");
+        CHECK(out.value()[1].releaseDate == "1999/06/01");
+        CHECK(out.value()[2].id == "digimon-the-movie-promo-cards");
+        CHECK(out.value()[2].releaseDate == "2000/10/01");
+    }
+
+    TEST_CASE("sorts by release date then name") {
+        const std::string json = R"([
+            {"name":"A","id":"ST-1","set_name":["Street Starter Set 2"]},
+            {"name":"B","id":"ST-2","set_name":["Series 1 Starter Set"]},
+            {"name":"C","id":"ST-3","set_name":["Street Starter Set 1"]}
+        ])";
+        const auto out = DigiBattle99SetSource::parseResponse(json);
+        REQUIRE(out.isOk());
+        REQUIRE(out.value().size() == 3);
+        CHECK(out.value()[0].name == "Series 1 Starter Set");
+        CHECK(out.value()[1].name == "Street Starter Set 1");
+        CHECK(out.value()[2].name == "Street Starter Set 2");
+    }
+
+    TEST_CASE("empty array returns an empty list") {
+        const auto out = DigiBattle99SetSource::parseResponse("[]");
+        REQUIRE(out.isOk());
+        CHECK(out.value().empty());
+    }
+
+    TEST_CASE("non-array object with error is an error") {
+        const auto out = DigiBattle99SetSource::parseResponse(
+            R"({"error":"No cards found for this search."})");
+        CHECK(out.isErr());
+    }
+
+    TEST_CASE("missing top-level array returns an error") {
+        const auto out = DigiBattle99SetSource::parseResponse(R"({"meta":{}})");
+        CHECK(out.isErr());
+    }
+
+    TEST_CASE("invalid JSON returns an error") {
+        const auto out = DigiBattle99SetSource::parseResponse("{not json");
+        CHECK(out.isErr());
+    }
+}
+
+TEST_SUITE("DigiBattle99SetSource::fetchAll") {
+    TEST_CASE("network error is surfaced as a Result error") {
+        FixedHttpClient http;
+        http.ok = false;
+        DigiBattle99SetSource src{http};
+        CHECK(src.fetchAll().isErr());
+    }
+
+    TEST_CASE("network success hits the Digi-Battle search endpoint") {
+        FixedHttpClient http;
+        http.ok = true;
+        http.body = R"([{"name":"Agumon","id":"ST-01","set_name":["Series 1 Starter Set"]}])";
+        DigiBattle99SetSource src{http};
+        const auto out = src.fetchAll();
+        REQUIRE(out.isOk());
+        CHECK(out.value().front().id == "series-1-starter-set");
+        CHECK(http.lastUrl == DigiBattle99SetSource::kEndpoint);
+    }
+}

tests/domain_json_tests.cpp

@@ -1,6 +1,7 @@
 #include <doctest/doctest.h>
 
 #include "ccm/domain/Configuration.hpp"
+#include "ccm/domain/DigiBattle99Card.hpp"
 #include "ccm/domain/Enums.hpp"
 #include "ccm/domain/MagicCard.hpp"
 #include "ccm/domain/PokemonCard.hpp"
@@ -23,6 +24,9 @@ TEST_SUITE("domain enums round-trip JSON as strings") {
         nlohmann::json jYgo = "YuGiOh";
         CHECK(jYgo.get<Game>() == Game::YuGiOh);
 
+        nlohmann::json jDigi = "DigiBattle99";
+        CHECK(jDigi.get<Game>() == Game::DigiBattle99);
+
         nlohmann::json j3 = Theme::Dark;
         CHECK(j3.get<std::string>() == "Dark");
         CHECK(j3.get<Theme>() == Theme::Dark);
@@ -153,6 +157,34 @@ TEST_SUITE("PokemonCard JSON") {
     }
 }
 
+TEST_SUITE("DigiBattle99Card JSON") {
+    TEST_CASE("uses 'setNo' and 'firstEdition' aliases") {
+        DigiBattle99Card c;
+        c.id = 3;
+        c.amount = 2;
+        c.name = "Agumon";
+        c.set = Set{"series-1-starter-set", "Series 1 Starter Set", "1999/06/01"};
+        c.setNo = "ST-01";
+        c.note = "starter";
+        c.images = {"a.png"};
+        c.language = Language::English;
+        c.condition = Condition::NearMint;
+        c.firstEdition = false;
+        c.holo = true;
+        c.signed_ = true;
+        c.altered = false;
+
+        nlohmann::json j = c;
+        CHECK(j.at("setNo") == "ST-01");
+        CHECK(j.at("firstEdition") == false);
+        CHECK(j.at("holo") == true);
+        CHECK(j.at("signed") == true);
+
+        const DigiBattle99Card back = j.get<DigiBattle99Card>();
+        CHECK(back == c);
+    }
+}
+
 TEST_SUITE("Configuration JSON matches Rust serde aliases") {
     TEST_CASE("dataStorage / defaultGame / theme keys are present") {
         Configuration cfg;
@@ -497,6 +529,36 @@ TEST_SUITE("Domain JSON required fields") {
         }
     }
 
+    TEST_CASE("DigiBattle99Card missing each required key throws") {
+        const nlohmann::json full = {
+            {"id", 3},
+            {"amount", 1},
+            {"name", "Agumon"},
+            {"set", nlohmann::json{
+                {"id", "series-1-starter-set"},
+                {"name", "Series 1 Starter Set"},
+                {"releaseDate", "1999/06/01"},
+            }},
+            {"setNo", "ST-01"},
+            {"note", ""},
+            {"images", nlohmann::json::array()},
+            {"language", "English"},
+            {"condition", "NearMint"},
+            {"firstEdition", false},
+            {"holo", true},
+            {"signed", false},
+            {"altered", false},
+        };
+
+        for (const char* key :
+             {"id", "amount", "name", "set", "setNo", "note", "images", "language", "condition",
+              "firstEdition", "holo", "signed", "altered"}) {
+            nlohmann::json partial = full;
+            partial.erase(key);
+            CHECK_THROWS(partial.get<DigiBattle99Card>());
+        }
+    }
+
     TEST_CASE("Configuration missing required key throws") {
         const nlohmann::json j = {
             {"defaultGame", "Magic"},

tests/game_module_tests.cpp

@@ -1,5 +1,6 @@
 #include <doctest/doctest.h>
 
+#include "ccm/games/digibattle99/DigiBattle99GameModule.hpp"
 #include "ccm/games/magic/MagicGameModule.hpp"
 #include "ccm/games/pokemon/PokemonGameModule.hpp"
 #include "ccm/games/yugioh/YuGiOhGameModule.hpp"
@@ -51,4 +52,15 @@ TEST_SUITE("game modules expose stable identity and wiring") {
         CHECK(module.cardPreviewSource() != nullptr);
         CHECK(static_cast<void*>(&module.setSource()) != static_cast<void*>(module.cardPreviewSource()));
     }
+
+    TEST_CASE("DigiBattle99 module reports canonical metadata") {
+        NoopHttpClient http;
+        DigiBattle99GameModule module(http);
+
+        CHECK(module.id() == Game::DigiBattle99);
+        CHECK(module.dirName() == "digibattle99");
+        CHECK(module.displayName() == "Digimon (Digi-Battle)");
+        CHECK(module.cardPreviewSource() != nullptr);
+        CHECK(static_cast<void*>(&module.setSource()) != static_cast<void*>(module.cardPreviewSource()));
+    }
 }

tests/local_image_store_tests.cpp

@@ -17,6 +17,7 @@ std::string dirNameForGame(Game g) {
         case Game::Magic: return "magic";
         case Game::Pokemon: return "pokemon";
         case Game::YuGiOh: return "yugioh";
+        case Game::DigiBattle99: return "digibattle99";
     }
     return "magic";
 }

tests/set_service_tests.cpp

@@ -148,6 +148,37 @@ TEST_SUITE("SetService") {
         CHECK(yugioh.source.calls == 1);
     }
 
+    TEST_CASE("DigiBattle99 module routes independently when all games are registered") {
+        InMemSetRepo repo;
+        SetService svc{repo};
+
+        FakeGameModule magic{Game::Magic};
+        magic.source.result = Result<std::vector<Set>>::ok({{"lea", "Alpha", "1993/08/05"}});
+        FakeGameModule pokemon{Game::Pokemon};
+        pokemon.source.result = Result<std::vector<Set>>::ok({{"base1", "Base", "1999/01/09"}});
+        FakeGameModule yugioh{Game::YuGiOh};
+        yugioh.source.result = Result<std::vector<Set>>::ok({{"LOB", "Legend of Blue Eyes", "2002/03/08"}});
+        FakeGameModule digi{Game::DigiBattle99};
+        digi.source.result = Result<std::vector<Set>>::ok(
+            {{"series-1-starter-set", "Series 1 Starter Set", "1999/06/01"}});
+
+        svc.registerModule(&magic);
+        svc.registerModule(&pokemon);
+        svc.registerModule(&yugioh);
+        svc.registerModule(&digi);
+
+        REQUIRE(svc.updateSets(Game::Magic).isOk());
+        REQUIRE(svc.updateSets(Game::Pokemon).isOk());
+        REQUIRE(svc.updateSets(Game::YuGiOh).isOk());
+        const auto out = svc.updateSets(Game::DigiBattle99);
+        REQUIRE(out.isOk());
+        CHECK(out.value().front().id == "series-1-starter-set");
+        CHECK(magic.source.calls == 1);
+        CHECK(pokemon.source.calls == 1);
+        CHECK(yugioh.source.calls == 1);
+        CHECK(digi.source.calls == 1);
+    }
+
     TEST_CASE("updateSets propagates repository save failures") {
         InMemSetRepo repo;
         repo.failSave = true;

ui_wx/AGENTS.md

@@ -9,7 +9,7 @@
 - `include/ccm/ui/MainFrame.hpp` + `src/MainFrame.cpp` — top-level window (default size `1210×770`), menu strip (`File` / `Game` / `Sets` / `Help`), toolbar (Add / Edit / Delete + filter input), and the splitter that swaps the active `IGameView`'s panels. The `Game` and `Sets` menus are built dynamically from `AppContext::gameViews` so adding a new game lights up its menu entries automatically. Filter and toolbar actions forward to `activeView()`. `EVT_PREVIEW_STATUS` (preview fetch outcome → status label; empty string resets to `"Ready"`) is the only event the frame binds; `EVT_CARD_SELECTED` is bound *per view* (each `IGameView` connects its typed list panel to its typed selected panel internally). About is a custom themed dialog (not `wxAboutBox`) so dark mode behavior stays consistent.
 - `include/ccm/ui/BaseCardListPanel.hpp` — header-only template `BaseCardListPanel<TCard, TSortColumn>` that owns ALL the non-game-specific `wxListCtrl` machinery: hidden zero-width spacer column (legacy of the MSW comctl32 image-list gutter workaround, kept to preserve column-index math), themed header row (clickable to sort, edge-drag to resize, divider double-click to autosize), per-icon-column cached `wxBitmap` pairs (normal + selected color) consumed by `IconListCtrl::MSWOnNotify` so row icons are pixel-perfect centered under the themed-header icons, rebuild guard so DESELECTED/SELECTED storms collapse into a single bubbled `EVT_CARD_SELECTED`, case-insensitive substring filter via `setFilter(...)`, per-column toggle-direction sort. Subclasses fill in column descriptors + per-row text + per-icon-column flag predicates + dispatch hooks (`sortBy`, `matchesFilter`).
 - `include/ccm/ui/IconListCtrl.hpp` + `src/IconListCtrl.cpp` — small `wxListCtrl` subclass that intercepts `NM_CUSTOMDRAW` on Windows and paints flag-icon sub-items at the exact center of each cell. It owns a `HIMAGELIST` (built from the cached `wxBitmap` pairs via straight-RGBA 32 bpp DIB sections) and draws each cell's icon with `ImageList_Draw(ILD_TRANSPARENT)` onto the native `HDC` from `NMLVCUSTOMDRAW`. This is the same low-level pixel path `wxImageList` uses internally, which is the only rendering path that has reliably preserved SVG transparency + correct fill color across light/dark themes on MSW. Two earlier attempts — `wxGraphicsContext::DrawBitmap` and a manually-premultiplied-DIB `AlphaBlend` — both rendered runtime-fill SVG icons as solid white in light mode and were abandoned (see convention 11). The custom-draw is purely about positioning; pixel format handling is delegated to comctl32.
-- `include/ccm/ui/BaseSelectedCardPanel.hpp` — header-only template `BaseSelectedCardPanel<TCard>` that owns the right-hand-side detail panel: preview image fetched via `CardPreviewService` (with the `shared_ptr<State>` + `std::atomic alive`/`currentGen` cancellation pattern), 2-column detail grid, flag-icon strip that collapses when no flags are set, image list with double-click viewer. If preview lookup fails or returns empty bytes, the panel loads a per-game **card-back fallback**: Magic and Pokémon use fixed HTTPS URLs (`fallbackImageUrlForGame`, CCM2-aligned); **Yu-Gi-Oh!** tries Yugipedia thumbnail URL, then full `Back-EN.png` on `ms.yugipedia.com`, then reads `<exeDir>/assets/ygo_card_back.png` (copied next to the executable by `app/CMakeLists.txt` on link — source file `ui_wx/assets/ygo_card_back.png`). The constructor caches `<exeDir>/` for that disk path. Subclasses describe the detail rows / flag icons / preview lookup `(name, setId, setNo)` and own a `Game` constant.
+- `include/ccm/ui/BaseSelectedCardPanel.hpp` — header-only template `BaseSelectedCardPanel<TCard>` that owns the right-hand-side detail panel: preview image fetched via `CardPreviewService` (with the `shared_ptr<State>` + `std::atomic alive`/`currentGen` cancellation pattern), 2-column detail grid, flag-icon strip that collapses when no flags are set, image list with double-click viewer. If preview lookup fails or returns empty bytes, the panel loads a per-game **card-back fallback**: Magic and Pokémon use fixed HTTPS URLs (`fallbackImageUrlForGame`, CCM2-aligned); **Yu-Gi-Oh!** tries Yugipedia thumbnail URL, then full `Back-EN.png` on `ms.yugipedia.com`, then reads `<exeDir>/assets/ygo_card_back.png`; **Digimon Digi-Battle** reads `<exeDir>/assets/digibattle99_card_back.png` (both bundled assets copied by `app/CMakeLists.txt` on link). The constructor caches `<exeDir>/` for that disk path. Subclasses describe the detail rows / flag icons / preview lookup `(name, setId, setNo)` and own a `Game` constant.
 - `include/ccm/ui/BaseCardEditDialog.hpp` — header-only template `BaseCardEditDialog<TCard>` that owns the standard Add/Edit form: Name, Set picker (read-only `wxComboBox` with prefix-match typeahead and case-insensitive id matching for legacy data), Amount spin, Language and Condition choices, Note, image management (Add multiple via `wxFD_MULTIPLE`, Remove, double-click to view), OK/Cancel + validation. The **Set** row is built on a host `wxPanel` with a horizontal `wxBoxSizer`; games may override `customizeSetPickerRow(row, combo)` to wrap the combo (default: combo only). After a programmatic selection, `applySetSelectionByIndex` updates `card_.set` and calls `onSetSelectionApplied()` (default no-op). After `buildAndPopulate()`, the template snapshots the loaded card into `openingSnapshot_`; in **`EditMode::Edit`**, OK asks **Yes/No** (“Save changes to this card?”) only when the card differs from that snapshot (dirty-only confirm). **Create** mode never prompts. Subclasses build the flags row (`buildFlagsRow`), append game-specific extra rows (e.g. Pokemon's `Set #`) via `appendExtraRows`, and copy values in/out of the typed card (`readExtraFromCard` / `writeExtraToCard`). The template binds `EVT_TEXT` on **Name** and invokes `onCardLookupContextChanged()` so games can drop stale keyed metadata when the user edits the lookup identity (Yu-Gi-Oh! clears its YGOPRODeck print-variant cache here). `YuGiOhCardEditDialog` overrides `customizeSetPickerRow` to add a **`SwitchCtrl`** pill switch plus a **hint** label (`Set name` / `Set code`), a text field, and **Auto detect** (resolves `Set.id` via `ccm/util/YuGiOhSetLookup.hpp` against `availableSets()`, then returns to the dropdown on success); it overrides `onSetSelectionApplied` to match manual set-change behavior. It additionally `CallAfter`s a silent `detectPrintVariants` when opening **Edit** (and after changing **Set**) so multi-print **Next** buttons can appear without pressing Auto detect first, as long as name + display set are populated. The base also exposes helpers to sync current control values and inspect the currently-selected set when a subclass needs derived-field UI.
 - `include/ccm/ui/SwitchCtrl.hpp` + `src/SwitchCtrl.cpp` — custom pill-track + thumb switch for small modal rows (Yu-Gi-Oh! set picker); fires `EVT_CCM_SWITCH` on user toggle and reads colors from `inferThemeFromWindow` / `paletteForTheme`.
 - `include/ccm/ui/Magic*.hpp` + `src/Magic*.cpp` — Magic implementations: `MagicCardListPanel`, `MagicSelectedCardPanel`, `MagicCardEditDialog`, `MagicGameView`. Each is ~50–100 lines of hook overrides on top of the matching base template.
@@ -67,7 +67,7 @@
     - When validating UI theming changes, rebuild and run `ccm` (the executable), not just `ccm_ui_wx`.
 15. **Preview fallback behavior (CCM2 parity where applicable):**
     - Keep unresolved external previews user-visible by showing a per-game card-back image in `BaseSelectedCardPanel` instead of a blank/transparent bitmap.
-    - Magic / Pokémon use single fixed HTTPS URLs (`Magic_card_back.jpg`, Bulbagarden `Cardback.jpg`). Yu-Gi-Oh! uses Yugipedia-hosted backs plus a **bundled** PNG beside the exe (`assets/ygo_card_back.png`) when the network path fails — keep that chain working when touching preview code.
+    - Magic / Pokémon use single fixed HTTPS URLs (`Magic_card_back.jpg`, Bulbagarden `Cardback.jpg`). Yu-Gi-Oh! uses Yugipedia-hosted backs plus a **bundled** PNG beside the exe (`assets/ygo_card_back.png`) when the network path fails. Digimon Digi-Battle uses a **bundled** PNG (`assets/digibattle99_card_back.png`) — keep those chains working when touching preview code.
     - If you change fallback sourcing (URLs or bundled asset), keep the "always show a reasonable card-back fallback" behavior intact for **every** game with remote previews.
 16. **Per-game auto-detect controls:**
     - Auto-detect actions in edit dialogs (e.g. detect set print number / rarity from API) are opt-in per game.
@@ -76,7 +76,7 @@
 
 ## Required follow-ups
 
-- If you replace **`ui_wx/assets/ygo_card_back.png`**, rebuild the **`ccm`** target so `app/CMakeLists.txt`'s `POST_BUILD` copy refreshes `<exeDir>/assets/`; do not remove the asset without updating `BaseSelectedCardPanel` / `docs/assets-and-info-apis.md`.
+- If you replace **`ui_wx/assets/ygo_card_back.png`** or **`ui_wx/assets/digibattle99_card_back.png`**, rebuild the **`ccm`** target so `app/CMakeLists.txt`'s `POST_BUILD` copy refreshes `<exeDir>/assets/`; do not remove an asset without updating `BaseSelectedCardPanel` / `docs/assets-and-info-apis.md`.
 - After adding a new dialog/panel `.cpp` you **must** add it to `ui_wx/CMakeLists.txt`.
 - After adding a new menu action you **must** allocate an `Ids::*` value in `MainFrame.hpp` (don't reuse `wxID_HIGHEST` math inline) and `Bind` it in `buildMenuBar`. The dynamic Game / Sets menus consume the `IdGameMenuBase` / `IdSetsMenuBase` ranges; do not stomp on those id ranges.
 - After changing `AppContext` you **must** update `app/main.cpp` so the composition root populates the new field.

ui_wx/CMakeLists.txt

@@ -19,6 +19,10 @@ add_library(ccm_ui_wx STATIC
     src/YuGiOhSelectedCardPanel.cpp
     src/YuGiOhCardEditDialog.cpp
     src/YuGiOhGameView.cpp
+    src/DigiBattle99CardListPanel.cpp
+    src/DigiBattle99SelectedCardPanel.cpp
+    src/DigiBattle99CardEditDialog.cpp
+    src/DigiBattle99GameView.cpp
 
     src/SettingsDialog.cpp
     src/SwitchCtrl.cpp

ui_wx/include/ccm/ui/AppContext.hpp

@@ -26,6 +26,7 @@ struct AppContext {
     IGameModule&                         magicModule;
     IGameModule&                         pokemonModule;
     IGameModule&                         yuGiOhModule;
+    IGameModule&                         digiBattle99Module;
     // Active per-game UI bundles. The order is the order shown in the
     // Game menu; the composition root constructs them and hands raw
     // pointers in. `MainFrame` does not own these — `app/main.cpp` does.

ui_wx/include/ccm/ui/BaseSelectedCardPanel.hpp

@@ -295,9 +295,11 @@ private:
             case Game::YuGiOh:
                 // Yugipedia English TCG backing (thumbnail — smaller than full scan).
                 return "https://ms.yugipedia.com/thumb/e/e5/Back-EN.png/250px-Back-EN.png";
-            default:
+            case Game::DigiBattle99:
+                // No stable public Digi-Battle back URL; UI uses bundled PNG.
                 return {};
         }
+        return {};
     }
 
     void buildInfoGrid(wxBoxSizer* root) {
@@ -424,6 +426,16 @@ private:
                             applyFallbackPayload(ss.str());
                         }
                     }
+                } else if (game == Game::DigiBattle99) {
+                    namespace fs = std::filesystem;
+                    const fs::path asset =
+                        fs::path(exeDirCopy) / "assets" / "digibattle99_card_back.png";
+                    std::ifstream in(asset, std::ios::binary);
+                    if (in) {
+                        std::ostringstream ss;
+                        ss << in.rdbuf();
+                        applyFallbackPayload(ss.str());
+                    }
                 } else {
                     const std::string fallbackUrl = fallbackImageUrlForGame(game);
                     if (!fallbackUrl.empty()) {

ui_wx/include/ccm/ui/DigiBattle99CardEditDialog.hpp

@@ -0,0 +1,81 @@
+#pragma once
+
+#include "ccm/domain/DigiBattle99Card.hpp"
+#include "ccm/ports/ICardPreviewSource.hpp"
+#include "ccm/services/CardPreviewService.hpp"
+#include "ccm/ui/BaseCardEditDialog.hpp"
+#include <wx/button.h>
+
+#include <atomic>
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace ccm::ui {
+
+class DigiBattle99CardEditDialog final : public BaseCardEditDialog<DigiBattle99Card> {
+public:
+    DigiBattle99CardEditDialog(wxWindow* parent,
+                               ImageService& imageService,
+                               SetService& setService,
+                               CardPreviewService& cardPreview,
+                               EditMode mode,
+                               DigiBattle99Card initial,
+                               const std::vector<Set>* preloadedSets = nullptr);
+    ~DigiBattle99CardEditDialog() override;
+
+protected:
+    void buildFlagsRow(wxBoxSizer* flagsBox) override;
+    void appendExtraRows(wxFlexGridSizer* grid) override;
+    void readExtraFromCard() override;
+    void writeExtraToCard() override;
+    [[nodiscard]] std::string updateMenuName() const override {
+        return "Update Digimon (Digi-Battle)";
+    }
+    void onCardLookupContextChanged() override;
+
+private:
+    struct VariantFetchState {
+        std::atomic<bool> alive{true};
+    };
+
+    void onAutoDetectSetNo(wxCommandEvent&);
+    void onNextSetNo(wxCommandEvent&);
+    void onSetSelectionChanged(wxCommandEvent&);
+    void autoDetectFromApi();
+    void clearCachedPrintVariants();
+    void requestVariantsAsync(unsigned capturedEpoch,
+                              std::string name,
+                              std::string setName,
+                              bool fillSetNoOnSuccess,
+                              bool showFailureDialog);
+    void applyDetectedVariants(unsigned capturedEpoch,
+                               Result<std::vector<AutoDetectedPrint>> detected,
+                               bool fillSetNoOnSuccess,
+                               bool showFailureDialog);
+    void rebuildVariantRingFromCache();
+    void syncRingPositionToControls();
+    void refreshVariantNextControls();
+    void scheduleDeferredVariantPrefetch();
+    void prefetchVariantsForCurrentCardSilent(unsigned capturedEpoch);
+    [[nodiscard]] static std::string storedSetNoFromControls(const wxTextCtrl* ctrl);
+    [[nodiscard]] static std::string normalizedStoredSetNo(std::string_view setNo);
+
+    EditMode                      dialogMode_;
+    unsigned                      variantFetchEpoch_{0};
+    CardPreviewService&           cardPreview_;
+    std::shared_ptr<VariantFetchState> variantFetchState_;
+    wxTextCtrl*                   setNoCtrl_{nullptr};
+    wxButton*                     autoSetNoBtn_{nullptr};
+    wxButton*                     nextSetNoBtn_{nullptr};
+    wxCheckBox*                   holoCheck_{nullptr};
+    wxCheckBox*                   firstEditionCheck_{nullptr};
+    wxCheckBox*                   signedCheck_{nullptr};
+    wxCheckBox*                   alteredCheck_{nullptr};
+
+    std::vector<AutoDetectedPrint> cachedVariants_;
+    std::vector<std::string>       uniqueSetNos_;
+    std::size_t                    setNoRingPos_{0};
+};
+
+}  // namespace ccm::ui

ui_wx/include/ccm/ui/DigiBattle99CardListPanel.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "ccm/domain/DigiBattle99Card.hpp"
+#include "ccm/services/CardSorter.hpp"
+#include "ccm/ui/BaseCardListPanel.hpp"
+
+namespace ccm::ui {
+
+class DigiBattle99CardListPanel final
+    : public BaseCardListPanel<DigiBattle99Card, DigiBattle99SortColumn> {
+public:
+    explicit DigiBattle99CardListPanel(wxWindow* parent);
+
+protected:
+    [[nodiscard]] std::vector<TextColumnSpec> declareTextColumns() const override;
+    [[nodiscard]] std::vector<IconColumnSpec> declareIconColumns() const override;
+    [[nodiscard]] std::string renderTextCell(const DigiBattle99Card& card,
+                                             std::size_t idx) const override;
+    [[nodiscard]] bool isIconColumnSet(const DigiBattle99Card& card,
+                                       std::size_t idx) const override;
+    void sortBy(DigiBattle99SortColumn column, bool ascending) override;
+    [[nodiscard]] bool matchesFilter(const DigiBattle99Card& card,
+                                     std::string_view filter) const override;
+};
+
+}  // namespace ccm::ui

ui_wx/include/ccm/ui/DigiBattle99GameView.hpp

@@ -0,0 +1,64 @@
+#pragma once
+
+#include "ccm/domain/DigiBattle99Card.hpp"
+#include "ccm/games/IGameModule.hpp"
+#include "ccm/services/CardPreviewService.hpp"
+#include "ccm/services/CollectionService.hpp"
+#include "ccm/services/ConfigService.hpp"
+#include "ccm/services/ImageService.hpp"
+#include "ccm/services/SetService.hpp"
+#include "ccm/ui/IGameView.hpp"
+
+#include <string>
+#include <string_view>
+#include <vector>
+
+namespace ccm::ui {
+
+class DigiBattle99CardListPanel;
+class DigiBattle99SelectedCardPanel;
+
+class DigiBattle99GameView final : public IGameView {
+public:
+    DigiBattle99GameView(ConfigService&                         config,
+                         CollectionService<DigiBattle99Card>&   collection,
+                         SetService&                            sets,
+                         ImageService&                          images,
+                         CardPreviewService&                    cardPreview,
+                         IGameModule&                           module);
+
+    [[nodiscard]] Game        gameId() const noexcept override { return Game::DigiBattle99; }
+    [[nodiscard]] std::string displayName() const override { return "Digimon (Digi-Battle)"; }
+
+    wxPanel* listPanel(wxWindow* parent) override;
+    wxPanel* selectedPanel(wxWindow* parent) override;
+
+    void refreshCollection() override;
+    void onAddCard(wxWindow* parentWindow) override;
+    void onEditCard(wxWindow* parentWindow) override;
+    void onDeleteCard(wxWindow* parentWindow) override;
+    std::string onUpdateSets(wxWindow* parentWindow) override;
+    void setFilter(std::string_view filter) override;
+    void applyTheme(const ThemePalette& palette) override;
+    [[nodiscard]] std::string updateSetsMenuLabel() const override {
+        return "Update Digimon (Digi-Battle)";
+    }
+
+private:
+    void ensureSetsLoaded();
+    const std::vector<Set>& setsForDialog();
+
+    ConfigService&                        config_;
+    CollectionService<DigiBattle99Card>&  collection_;
+    SetService&                           sets_;
+    ImageService&                         images_;
+    CardPreviewService&                   cardPreview_;
+    IGameModule&                          module_;
+
+    DigiBattle99CardListPanel*     listPanel_{nullptr};
+    DigiBattle99SelectedCardPanel* selectedPanel_{nullptr};
+    std::vector<Set>               setsCache_;
+    bool                           attemptedInitialSetLoad_{false};
+};
+
+}  // namespace ccm::ui

ui_wx/include/ccm/ui/DigiBattle99SelectedCardPanel.hpp

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "ccm/domain/DigiBattle99Card.hpp"
+#include "ccm/ui/BaseSelectedCardPanel.hpp"
+
+namespace ccm::ui {
+
+class DigiBattle99SelectedCardPanel final : public BaseSelectedCardPanel<DigiBattle99Card> {
+public:
+    DigiBattle99SelectedCardPanel(wxWindow* parent,
+                                  ImageService& imageService,
+                                  CardPreviewService& cardPreview);
+
+protected:
+    [[nodiscard]] std::vector<DetailRowSpec> declareDetailRows() const override;
+    [[nodiscard]] std::vector<FlagIconSpec>  declareFlagIcons()  const override;
+    [[nodiscard]] std::string detailValueFor(const DigiBattle99Card& card,
+                                             DetailKey key) const override;
+    [[nodiscard]] bool isFlagSet(const DigiBattle99Card& card, DetailKey key) const override;
+    [[nodiscard]] std::tuple<std::string, std::string, std::string>
+        previewKey(const DigiBattle99Card& card) const override;
+    [[nodiscard]] Game gameId() const noexcept override { return Game::DigiBattle99; }
+};
+
+}  // namespace ccm::ui

ui_wx/src/DigiBattle99CardEditDialog.cpp

@@ -0,0 +1,255 @@
+#include "ccm/ui/DigiBattle99CardEditDialog.hpp"
+
+#include "ccm/domain/Enums.hpp"
+#include "ccm/games/digibattle99/DigiBattle99CardPreviewSource.hpp"
+#include <wx/app.h>
+#include <wx/panel.h>
+#include <thread>
+#include <unordered_set>
+
+namespace ccm::ui {
+
+DigiBattle99CardEditDialog::DigiBattle99CardEditDialog(wxWindow* parent,
+                                                       ImageService& imageService,
+                                                       SetService& setService,
+                                                       CardPreviewService& cardPreview,
+                                                       EditMode mode,
+                                                       DigiBattle99Card initial,
+                                                       const std::vector<Set>* preloadedSets)
+    : BaseCardEditDialog<DigiBattle99Card>(
+          parent,
+          mode == EditMode::Create ? "Add Digimon (Digi-Battle) Card"
+                                   : "Edit Digimon (Digi-Battle) Card",
+          imageService, setService, mode, std::move(initial), Game::DigiBattle99,
+          preloadedSets),
+      dialogMode_(mode),
+      cardPreview_(cardPreview),
+      variantFetchState_(std::make_shared<VariantFetchState>()) {
+    buildAndPopulate();
+    if (dialogMode_ == EditMode::Edit) {
+        scheduleDeferredVariantPrefetch();
+    }
+}
+
+DigiBattle99CardEditDialog::~DigiBattle99CardEditDialog() {
+    if (variantFetchState_) {
+        variantFetchState_->alive.store(false);
+    }
+}
+
+void DigiBattle99CardEditDialog::onCardLookupContextChanged() {
+    clearCachedPrintVariants();
+}
+
+void DigiBattle99CardEditDialog::buildFlagsRow(wxBoxSizer* flagsBox) {
+    holoCheck_         = new wxCheckBox(this, wxID_ANY, "Holo");
+    firstEditionCheck_ = new wxCheckBox(this, wxID_ANY, "1. Edition");
+    signedCheck_       = new wxCheckBox(this, wxID_ANY, "Signed");
+    alteredCheck_      = new wxCheckBox(this, wxID_ANY, "Altered");
+    flagsBox->Add(holoCheck_,         0, wxRIGHT, 12);
+    flagsBox->Add(firstEditionCheck_, 0, wxRIGHT, 12);
+    flagsBox->Add(signedCheck_,       0, wxRIGHT, 12);
+    flagsBox->Add(alteredCheck_,      0, wxRIGHT, 12);
+}
+
+void DigiBattle99CardEditDialog::appendExtraRows(wxFlexGridSizer* grid) {
+    auto* setNoPanel = new wxPanel(this, wxID_ANY);
+    setNoCtrl_ = new wxTextCtrl(setNoPanel, wxID_ANY);
+    autoSetNoBtn_ = new wxButton(setNoPanel, wxID_ANY, "Auto detect");
+    autoSetNoBtn_->Bind(wxEVT_BUTTON, &DigiBattle99CardEditDialog::onAutoDetectSetNo, this);
+    nextSetNoBtn_ = new wxButton(setNoPanel, wxID_ANY, "Next");
+    nextSetNoBtn_->Bind(wxEVT_BUTTON, &DigiBattle99CardEditDialog::onNextSetNo, this);
+    nextSetNoBtn_->Show(false);
+    auto* setNoRow = new wxBoxSizer(wxHORIZONTAL);
+    setNoRow->Add(setNoCtrl_, 1, wxALIGN_CENTER_VERTICAL | wxRIGHT, 6);
+    setNoRow->Add(autoSetNoBtn_, 0, wxALIGN_CENTER_VERTICAL | wxRIGHT, 6);
+    setNoRow->Add(nextSetNoBtn_, 0, wxALIGN_CENTER_VERTICAL);
+    setNoPanel->SetSizer(setNoRow);
+
+    appendRow(grid, "Set #", setNoPanel);
+
+    if (auto* setCombo = setComboControl()) {
+        setCombo->Bind(wxEVT_COMBOBOX, &DigiBattle99CardEditDialog::onSetSelectionChanged, this);
+    }
+}
+
+std::string DigiBattle99CardEditDialog::normalizedStoredSetNo(std::string_view setNo) {
+    return DigiBattle99CardPreviewSource::normalizeCardNumber(setNo);
+}
+
+std::string DigiBattle99CardEditDialog::storedSetNoFromControls(const wxTextCtrl* ctrl) {
+    if (ctrl == nullptr) return {};
+    return normalizedStoredSetNo(ctrl->GetValue().ToStdString(wxConvUTF8));
+}
+
+void DigiBattle99CardEditDialog::readExtraFromCard() {
+    clearCachedPrintVariants();
+    if (setNoCtrl_) {
+        setNoCtrl_->ChangeValue(
+            wxString::FromUTF8(normalizedStoredSetNo(constCard().setNo).c_str()));
+    }
+    if (holoCheck_)         holoCheck_->SetValue(constCard().holo);
+    if (firstEditionCheck_) firstEditionCheck_->SetValue(constCard().firstEdition);
+    if (signedCheck_)       signedCheck_->SetValue(constCard().signed_);
+    if (alteredCheck_)      alteredCheck_->SetValue(constCard().altered);
+}
+
+void DigiBattle99CardEditDialog::writeExtraToCard() {
+    if (setNoCtrl_)         mutableCard().setNo        = storedSetNoFromControls(setNoCtrl_);
+    if (holoCheck_)         mutableCard().holo         = holoCheck_->IsChecked();
+    if (firstEditionCheck_) mutableCard().firstEdition = firstEditionCheck_->IsChecked();
+    if (signedCheck_)       mutableCard().signed_      = signedCheck_->IsChecked();
+    if (alteredCheck_)      mutableCard().altered      = alteredCheck_->IsChecked();
+}
+
+void DigiBattle99CardEditDialog::clearCachedPrintVariants() {
+    ++variantFetchEpoch_;
+    cachedVariants_.clear();
+    uniqueSetNos_.clear();
+    setNoRingPos_ = 0;
+    refreshVariantNextControls();
+}
+
+void DigiBattle99CardEditDialog::scheduleDeferredVariantPrefetch() {
+    const unsigned epoch = variantFetchEpoch_;
+    wxTheApp->CallAfter([this, epoch]() {
+        prefetchVariantsForCurrentCardSilent(epoch);
+    });
+}
+
+void DigiBattle99CardEditDialog::prefetchVariantsForCurrentCardSilent(unsigned capturedEpoch) {
+    if (capturedEpoch != variantFetchEpoch_) return;
+    if (!cachedVariants_.empty()) return;
+    const auto& card = constCard();
+    // digimoncard.io pack= uses the display set name, not the slug id.
+    if (card.name.empty() || card.set.name.empty()) return;
+
+    requestVariantsAsync(capturedEpoch, card.name, card.set.name, false, false);
+}
+
+void DigiBattle99CardEditDialog::requestVariantsAsync(unsigned capturedEpoch,
+                                                      std::string name,
+                                                      std::string setName,
+                                                      bool fillSetNoOnSuccess,
+                                                      bool showFailureDialog) {
+    if (capturedEpoch != variantFetchEpoch_) return;
+
+    if (fillSetNoOnSuccess && autoSetNoBtn_) {
+        autoSetNoBtn_->Disable();
+    }
+
+    auto state = variantFetchState_;
+    CardPreviewService* svc = &cardPreview_;
+    DigiBattle99CardEditDialog* self = this;
+    std::thread([state, svc, self, capturedEpoch, name = std::move(name),
+                 setName = std::move(setName), fillSetNoOnSuccess, showFailureDialog]() {
+        auto detected = svc->detectPrintVariants(Game::DigiBattle99, name, setName);
+        wxTheApp->CallAfter([state, self, capturedEpoch, detected = std::move(detected),
+                             fillSetNoOnSuccess, showFailureDialog]() mutable {
+            if (!state->alive.load()) return;
+            self->applyDetectedVariants(capturedEpoch, std::move(detected),
+                                        fillSetNoOnSuccess, showFailureDialog);
+        });
+    }).detach();
+}
+
+void DigiBattle99CardEditDialog::applyDetectedVariants(
+    unsigned capturedEpoch,
+    Result<std::vector<AutoDetectedPrint>> detected,
+    bool fillSetNoOnSuccess,
+    bool showFailureDialog) {
+    if (capturedEpoch != variantFetchEpoch_) return;
+
+    if (fillSetNoOnSuccess && autoSetNoBtn_) {
+        autoSetNoBtn_->Enable();
+    }
+
+    if (!detected) {
+        if (showFailureDialog) {
+            showThemedMessageDialog(this, "Auto detect failed: " + detected.error(), "Auto detect",
+                                    wxOK | wxICON_WARNING);
+        }
+        return;
+    }
+
+    cachedVariants_ = std::move(detected).value();
+    if (fillSetNoOnSuccess && setNoCtrl_ && !cachedVariants_.empty()) {
+        setNoCtrl_->ChangeValue(
+            wxString::FromUTF8(cachedVariants_.front().setNo.c_str()));
+    }
+
+    rebuildVariantRingFromCache();
+    syncRingPositionToControls();
+    refreshVariantNextControls();
+}
+
+void DigiBattle99CardEditDialog::rebuildVariantRingFromCache() {
+    uniqueSetNos_.clear();
+    if (cachedVariants_.empty()) return;
+
+    std::unordered_set<std::string> seen;
+    seen.reserve(cachedVariants_.size());
+    for (const auto& p : cachedVariants_) {
+        if (p.setNo.empty()) continue;
+        if (!seen.insert(p.setNo).second) continue;
+        uniqueSetNos_.push_back(p.setNo);
+    }
+}
+
+void DigiBattle99CardEditDialog::syncRingPositionToControls() {
+    if (!setNoCtrl_) return;
+    const std::string current = storedSetNoFromControls(setNoCtrl_);
+    setNoRingPos_ = 0;
+    for (std::size_t i = 0; i < uniqueSetNos_.size(); ++i) {
+        if (uniqueSetNos_[i] == current) {
+            setNoRingPos_ = i;
+            break;
+        }
+    }
+}
+
+void DigiBattle99CardEditDialog::refreshVariantNextControls() {
+    if (!nextSetNoBtn_) return;
+    nextSetNoBtn_->Show(uniqueSetNos_.size() > 1);
+    Layout();
+    if (GetSizer()) Fit();
+}
+
+void DigiBattle99CardEditDialog::onAutoDetectSetNo(wxCommandEvent&) {
+    autoDetectFromApi();
+}
+
+void DigiBattle99CardEditDialog::onNextSetNo(wxCommandEvent&) {
+    if (uniqueSetNos_.size() <= 1) return;
+    setNoRingPos_ = (setNoRingPos_ + 1) % uniqueSetNos_.size();
+    if (setNoCtrl_) {
+        setNoCtrl_->ChangeValue(wxString::FromUTF8(uniqueSetNos_[setNoRingPos_].c_str()));
+    }
+    refreshVariantNextControls();
+}
+
+void DigiBattle99CardEditDialog::autoDetectFromApi() {
+    syncCardFromControls();
+    const auto& card = constCard();
+    if (card.name.empty()) {
+        showThemedMessageDialog(this, "Enter a card name first.", "Auto detect",
+                                wxOK | wxICON_INFORMATION);
+        return;
+    }
+    if (card.set.name.empty()) {
+        showThemedMessageDialog(this, "Select a set first.", "Auto detect",
+                                wxOK | wxICON_INFORMATION);
+        return;
+    }
+
+    const unsigned epoch = variantFetchEpoch_;
+    requestVariantsAsync(epoch, card.name, card.set.name, true, true);
+}
+
+void DigiBattle99CardEditDialog::onSetSelectionChanged(wxCommandEvent& ev) {
+    clearCachedPrintVariants();
+    scheduleDeferredVariantPrefetch();
+    ev.Skip();
+}
+
+}  // namespace ccm::ui

ui_wx/src/DigiBattle99CardListPanel.cpp

@@ -0,0 +1,71 @@
+#include "ccm/ui/DigiBattle99CardListPanel.hpp"
+
+#include "ccm/services/CardFilter.hpp"
+#include "ccm/ui/SvgIcons.hpp"
+
+#include <string>
+
+namespace ccm::ui {
+
+DigiBattle99CardListPanel::DigiBattle99CardListPanel(wxWindow* parent)
+    : BaseCardListPanel<DigiBattle99Card, DigiBattle99SortColumn>(parent) {
+    buildLayout();
+}
+
+std::vector<DigiBattle99CardListPanel::TextColumnSpec>
+DigiBattle99CardListPanel::declareTextColumns() const {
+    return {
+        {"Name",      220, wxLIST_FORMAT_LEFT,  DigiBattle99SortColumn::Name},
+        {"Set",       180, wxLIST_FORMAT_LEFT,  DigiBattle99SortColumn::SetReleaseDate},
+        {"Amount",    70,  wxLIST_FORMAT_RIGHT, DigiBattle99SortColumn::Amount},
+        {"Condition", 100, wxLIST_FORMAT_LEFT,  DigiBattle99SortColumn::Condition},
+        {"Language",  100, wxLIST_FORMAT_LEFT,  DigiBattle99SortColumn::Language},
+        {"Note",      220, wxLIST_FORMAT_LEFT,  DigiBattle99SortColumn::Note},
+    };
+}
+
+std::vector<DigiBattle99CardListPanel::IconColumnSpec>
+DigiBattle99CardListPanel::declareIconColumns() const {
+    constexpr int kFlagColWidth = 36;
+    return {
+        {kSvgHolo,         kFlagColWidth, DigiBattle99SortColumn::Holo},
+        {kSvgFirstEdition, kFlagColWidth, DigiBattle99SortColumn::FirstEdition},
+        {kSvgSigned,       kFlagColWidth, DigiBattle99SortColumn::Signed},
+        {kSvgAltered,      kFlagColWidth, DigiBattle99SortColumn::Altered},
+    };
+}
+
+std::string DigiBattle99CardListPanel::renderTextCell(const DigiBattle99Card& card,
+                                                      std::size_t idx) const {
+    switch (idx) {
+    case 0: return card.name;
+    case 1: return card.set.name;
+    case 2: return std::to_string(card.amount);
+    case 3: return std::string(to_string(card.condition));
+    case 4: return std::string(to_string(card.language));
+    case 5: return card.note;
+    }
+    return {};
+}
+
+bool DigiBattle99CardListPanel::isIconColumnSet(const DigiBattle99Card& card,
+                                                std::size_t idx) const {
+    switch (idx) {
+    case 0: return card.holo;
+    case 1: return card.firstEdition;
+    case 2: return card.signed_;
+    case 3: return card.altered;
+    }
+    return false;
+}
+
+void DigiBattle99CardListPanel::sortBy(DigiBattle99SortColumn column, bool ascending) {
+    sortDigiBattle99Cards(mutableCards(), column, ascending);
+}
+
+bool DigiBattle99CardListPanel::matchesFilter(const DigiBattle99Card& card,
+                                              std::string_view filter) const {
+    return matchesDigiBattle99Filter(card, filter);
+}
+
+}  // namespace ccm::ui

ui_wx/src/DigiBattle99GameView.cpp

@@ -0,0 +1,216 @@
+#include "ccm/ui/DigiBattle99GameView.hpp"
+
+#include "ccm/ui/CardEditModalGuard.hpp"
+#include "ccm/ui/DigiBattle99CardEditDialog.hpp"
+#include "ccm/ui/DigiBattle99CardListPanel.hpp"
+#include "ccm/ui/DigiBattle99SelectedCardPanel.hpp"
+#include "ccm/ui/Theme.hpp"
+
+#include <wx/msgdlg.h>
+#include <wx/window.h>
+
+#include <optional>
+#include <string>
+
+namespace ccm::ui {
+
+DigiBattle99GameView::DigiBattle99GameView(ConfigService&                         config,
+                                           CollectionService<DigiBattle99Card>&   collection,
+                                           SetService&                            sets,
+                                           ImageService&                          images,
+                                           CardPreviewService&                    cardPreview,
+                                           IGameModule&                           module)
+    : config_(config),
+      collection_(collection),
+      sets_(sets),
+      images_(images),
+      cardPreview_(cardPreview),
+      module_(module) {}
+
+void DigiBattle99GameView::ensureSetsLoaded() {
+    if (attemptedInitialSetLoad_) return;
+    attemptedInitialSetLoad_ = true;
+
+    auto cached = sets_.getSets(Game::DigiBattle99);
+    if (cached) {
+        setsCache_ = std::move(cached).value();
+        if (!setsCache_.empty()) return;
+    } else {
+        setsCache_.clear();
+    }
+
+    auto refreshed = sets_.updateSets(Game::DigiBattle99);
+    if (refreshed) {
+        setsCache_ = std::move(refreshed).value();
+    }
+}
+
+wxPanel* DigiBattle99GameView::listPanel(wxWindow* parent) {
+    if (listPanel_ == nullptr) {
+        listPanel_ = new DigiBattle99CardListPanel(parent);
+        listPanel_->Bind(EVT_CARD_SELECTED, [this](wxCommandEvent&) {
+            if (selectedPanel_ != nullptr && listPanel_ != nullptr) {
+                selectedPanel_->setCard(listPanel_->selected());
+            }
+        });
+        listPanel_->Bind(EVT_CARD_ACTIVATED, [this](wxCommandEvent&) {
+            wxWindow* owner = wxGetTopLevelParent(listPanel_);
+            onEditCard(owner != nullptr ? owner : static_cast<wxWindow*>(listPanel_));
+        });
+    }
+    return listPanel_;
+}
+
+wxPanel* DigiBattle99GameView::selectedPanel(wxWindow* parent) {
+    if (selectedPanel_ == nullptr) {
+        selectedPanel_ = new DigiBattle99SelectedCardPanel(parent, images_, cardPreview_);
+    }
+    return selectedPanel_;
+}
+
+void DigiBattle99GameView::refreshCollection() {
+    if (listPanel_ == nullptr) return;
+    auto loaded = collection_.list(Game::DigiBattle99);
+    if (!loaded) {
+        showThemedMessageDialog(
+            nullptr,
+            "Failed to load Digimon (Digi-Battle) collection: " + loaded.error(),
+            "Error", wxOK | wxICON_ERROR);
+        return;
+    }
+    listPanel_->setCards(std::move(loaded).value());
+    listPanel_->activateSelection();
+    if (selectedPanel_) selectedPanel_->setCard(listPanel_->selected());
+}
+
+const std::vector<Set>& DigiBattle99GameView::setsForDialog() {
+    ensureSetsLoaded();
+    if (!setsCache_.empty()) return setsCache_;
+    auto loaded = sets_.getSets(Game::DigiBattle99);
+    if (loaded) setsCache_ = std::move(loaded).value();
+    else        setsCache_.clear();
+    return setsCache_;
+}
+
+void DigiBattle99GameView::onAddCard(wxWindow* parentWindow) {
+    if (cardEditModalIsActive()) {
+        showThemedMessageDialog(parentWindow, wxString::FromUTF8(kCardEditModalBlockedUtf8),
+                                wxString::FromUTF8("Add card"), wxOK | wxICON_INFORMATION);
+        return;
+    }
+    DigiBattle99Card fresh;
+    fresh.amount = 1;
+    fresh.language = Language::English;
+    fresh.condition = Condition::NearMint;
+
+    DigiBattle99CardEditDialog dlg(parentWindow, images_, sets_, cardPreview_, EditMode::Create,
+                                   fresh, &setsForDialog());
+    themeModalDialog(&dlg, config_.current().theme);
+    CardEditModalGuard modalGuard;
+    if (dlg.ShowModal() != wxID_OK) return;
+
+    auto added = collection_.add(Game::DigiBattle99, dlg.card());
+    if (!added) {
+        showThemedMessageDialog(parentWindow, "Failed to add card: " + added.error(),
+                                "Error", wxOK | wxICON_ERROR);
+        return;
+    }
+
+    DigiBattle99Card persisted = dlg.card();
+    persisted.id = added.value();
+    auto normalized = images_.normalizeNamesForPersistedCard(
+        Game::DigiBattle99, persisted.id, persisted.set.name, persisted.name, persisted.images);
+    if (normalized) {
+        if (normalized.value() != persisted.images) {
+            persisted.images = std::move(normalized).value();
+            auto updated = collection_.update(Game::DigiBattle99, persisted);
+            if (!updated) {
+                showThemedMessageDialog(
+                    parentWindow,
+                    "Card added, but image name normalization failed to persist: " +
+                        updated.error(),
+                    "Warning", wxOK | wxICON_WARNING);
+            }
+        }
+    } else {
+        showThemedMessageDialog(
+            parentWindow,
+            "Card added, but image rename to ID-prefixed format failed: " + normalized.error(),
+            "Warning", wxOK | wxICON_WARNING);
+    }
+    refreshCollection();
+}
+
+void DigiBattle99GameView::onEditCard(wxWindow* parentWindow) {
+    if (listPanel_ == nullptr) return;
+    auto sel = listPanel_->selected();
+    if (!sel) {
+        showThemedMessageDialog(parentWindow, "Select a card first.", "Edit",
+                                wxOK | wxICON_INFORMATION);
+        return;
+    }
+    if (cardEditModalIsActive()) {
+        showThemedMessageDialog(parentWindow, wxString::FromUTF8(kCardEditModalBlockedUtf8),
+                                wxString::FromUTF8("Edit"), wxOK | wxICON_INFORMATION);
+        return;
+    }
+    DigiBattle99CardEditDialog dlg(parentWindow, images_, sets_, cardPreview_, EditMode::Edit,
+                                   *sel, &setsForDialog());
+    themeModalDialog(&dlg, config_.current().theme);
+    CardEditModalGuard modalGuard;
+    if (dlg.ShowModal() != wxID_OK) return;
+    auto updated = collection_.update(Game::DigiBattle99, dlg.card());
+    if (!updated) {
+        showThemedMessageDialog(parentWindow, "Failed to update card: " + updated.error(),
+                                "Error", wxOK | wxICON_ERROR);
+        return;
+    }
+    refreshCollection();
+}
+
+void DigiBattle99GameView::onDeleteCard(wxWindow* parentWindow) {
+    if (listPanel_ == nullptr) return;
+    auto sel = listPanel_->selected();
+    if (!sel) {
+        showThemedMessageDialog(parentWindow, "Select a card first.", "Delete",
+                                wxOK | wxICON_INFORMATION);
+        return;
+    }
+    if (showThemedConfirmDialog(parentWindow, "Delete \"" + sel->name + "\"?",
+                                "Confirm") != wxID_YES) {
+        return;
+    }
+    auto removed = collection_.remove(Game::DigiBattle99, sel->id);
+    if (!removed) {
+        showThemedMessageDialog(parentWindow, "Failed to delete card: " + removed.error(),
+                                "Error", wxOK | wxICON_ERROR);
+        return;
+    }
+    refreshCollection();
+}
+
+std::string DigiBattle99GameView::onUpdateSets(wxWindow* parentWindow) {
+    auto out = sets_.updateSets(Game::DigiBattle99);
+    if (!out) {
+        showThemedMessageDialog(parentWindow, "Failed to update sets: " + out.error(),
+                                "Error", wxOK | wxICON_ERROR);
+        return "Update failed";
+    }
+    setsCache_ = out.value();
+    showThemedMessageDialog(
+        parentWindow,
+        "Updated " + std::to_string(out.value().size()) + " Digimon (Digi-Battle) sets.",
+        "Sets updated", wxOK | wxICON_INFORMATION);
+    return "Digimon (Digi-Battle) sets updated.";
+}
+
+void DigiBattle99GameView::setFilter(std::string_view filter) {
+    if (listPanel_) listPanel_->setFilter(filter);
+}
+
+void DigiBattle99GameView::applyTheme(const ThemePalette& palette) {
+    if (listPanel_)     listPanel_->applyTheme(palette);
+    if (selectedPanel_) selectedPanel_->applyTheme(palette);
+}
+
+}  // namespace ccm::ui

ui_wx/src/DigiBattle99SelectedCardPanel.cpp

@@ -0,0 +1,84 @@
+#include "ccm/ui/DigiBattle99SelectedCardPanel.hpp"
+
+#include "ccm/ui/SvgIcons.hpp"
+
+#include <string>
+
+namespace ccm::ui {
+
+namespace {
+enum DigiBattle99DetailKey : int {
+    kName = 0,
+    kSet,
+    kSetNo,
+    kLanguage,
+    kCondition,
+    kAmount,
+    kHolo,
+    kFirstEdition,
+    kSigned,
+    kAltered,
+};
+}  // namespace
+
+DigiBattle99SelectedCardPanel::DigiBattle99SelectedCardPanel(wxWindow* parent,
+                                                             ImageService& imageService,
+                                                             CardPreviewService& cardPreview)
+    : BaseSelectedCardPanel<DigiBattle99Card>(parent, imageService, cardPreview) {
+    buildLayout();
+}
+
+std::vector<DigiBattle99SelectedCardPanel::DetailRowSpec>
+DigiBattle99SelectedCardPanel::declareDetailRows() const {
+    return {
+        {"Name",      kName,      "(no card selected)"},
+        {"Set",       kSet,       ""},
+        {"Set #",     kSetNo,     ""},
+        {"Language",  kLanguage,  ""},
+        {"Condition", kCondition, ""},
+        {"Amount",    kAmount,    ""},
+    };
+}
+
+std::vector<DigiBattle99SelectedCardPanel::FlagIconSpec>
+DigiBattle99SelectedCardPanel::declareFlagIcons() const {
+    return {
+        {kSvgHolo,         "Holo",        kHolo},
+        {kSvgFirstEdition, "1. Edition",  kFirstEdition},
+        {kSvgSigned,       "Signed",      kSigned},
+        {kSvgAltered,      "Altered",     kAltered},
+    };
+}
+
+std::string DigiBattle99SelectedCardPanel::detailValueFor(const DigiBattle99Card& card,
+                                                          DetailKey key) const {
+    switch (key) {
+    case kName:         return card.name;
+    case kSet:          return card.set.name;
+    case kSetNo:        return card.setNo;
+    case kLanguage:     return std::string(to_string(card.language));
+    case kCondition:    return std::string(to_string(card.condition));
+    case kAmount:       return std::to_string(card.amount);
+    case kNoteKey:      return card.note;
+    }
+    return {};
+}
+
+bool DigiBattle99SelectedCardPanel::isFlagSet(const DigiBattle99Card& card,
+                                              DetailKey key) const {
+    switch (key) {
+    case kHolo:         return card.holo;
+    case kFirstEdition: return card.firstEdition;
+    case kSigned:       return card.signed_;
+    case kAltered:      return card.altered;
+    }
+    return false;
+}
+
+std::tuple<std::string, std::string, std::string>
+DigiBattle99SelectedCardPanel::previewKey(const DigiBattle99Card& card) const {
+    // Middle slot is Set.name (pack display name) for digimoncard.io pack=.
+    return {card.name, card.set.name, card.setNo};
+}
+
+}  // namespace ccm::ui

ui_wx/src/MainFrame.cpp

@@ -43,6 +43,8 @@ std::string dirNameForGame(Game g) {
     switch (g) {
         case Game::Magic:        return "magic";
         case Game::Pokemon:      return "pokemon";
+        case Game::YuGiOh:       return "yugioh";
+        case Game::DigiBattle99: return "digibattle99";
     }
     return "magic";
 }
@@ -67,7 +69,7 @@ void ensureDataStorageScaffold(const Configuration& cfg) {
         }
     }
 
-    for (Game game : {Game::Magic, Game::Pokemon}) {
+    for (Game game : allGames()) {
         const fs::path gameRoot = root / dirNameForGame(game);
         fs::create_directories(gameRoot / "images", ec);
         if (ec) continue;

ui_wx/src/SettingsDialog.cpp

@@ -1,5 +1,6 @@
 #include "ccm/ui/SettingsDialog.hpp"
 #include "ccm/ui/Theme.hpp"
+#include "ccm/domain/Enums.hpp"
 
 #include <wx/button.h>
 #include <wx/dirdlg.h>
@@ -9,6 +10,20 @@
 
 namespace ccm::ui {
 
+namespace {
+
+wxString displayLabelForGame(Game g) {
+    switch (g) {
+        case Game::Magic:        return "Magic";
+        case Game::Pokemon:      return "Pokemon";
+        case Game::YuGiOh:       return "Yu-Gi-Oh!";
+        case Game::DigiBattle99: return "Digimon (Digi-Battle)";
+    }
+    return wxString::FromUTF8(to_string(g).data());
+}
+
+}  // namespace
+
 SettingsDialog::SettingsDialog(wxWindow* parent, ConfigService& config)
     : wxDialog(parent, wxID_ANY, "Settings",
                wxDefaultPosition, wxSize(560, 200),
@@ -30,9 +45,14 @@ SettingsDialog::SettingsDialog(wxWindow* parent, ConfigService& config)
     gameRow->Add(new wxStaticText(this, wxID_ANY, "Default game:"),
                  0, wxALIGN_CENTER_VERTICAL | wxRIGHT, 6);
     defaultGameChoice_ = new wxChoice(this, wxID_ANY);
-    defaultGameChoice_->Append("Magic");
-    defaultGameChoice_->Append("Pokemon");
-    defaultGameChoice_->SetSelection(config_.current().defaultGame == Game::Magic ? 0 : 1);
+    int selected = 0;
+    int idx = 0;
+    for (const Game g : allGames()) {
+        defaultGameChoice_->Append(displayLabelForGame(g));
+        if (g == config_.current().defaultGame) selected = idx;
+        ++idx;
+    }
+    defaultGameChoice_->SetSelection(selected);
     gameRow->Add(defaultGameChoice_, 0);
     root->Add(gameRow, 0, wxEXPAND | wxLEFT | wxRIGHT, 10);
 
@@ -77,7 +97,11 @@ void SettingsDialog::onBrowse(wxCommandEvent&) {
 void SettingsDialog::onOk(wxCommandEvent& ev) {
     Configuration next = config_.current();
     next.dataStorage = dataDirCtrl_->GetValue().ToStdString();
-    next.defaultGame = defaultGameChoice_->GetSelection() == 0 ? Game::Magic : Game::Pokemon;
+    const int gameSel = defaultGameChoice_->GetSelection();
+    const auto& games = allGames();
+    if (gameSel >= 0 && static_cast<std::size_t>(gameSel) < games.size()) {
+        next.defaultGame = games[static_cast<std::size_t>(gameSel)];
+    }
     switch (themeChoice_->GetSelection()) {
         case 1: next.theme = Theme::Dark; break;
         case 0: