diff --git a/apps/api/src/gameSessionStore/GameSessionStore.ts b/apps/api/src/gameSessionStore/GameSessionStore.ts
new file mode 100644
index 0000000..766f26c
--- /dev/null
+++ b/apps/api/src/gameSessionStore/GameSessionStore.ts
@@ -0,0 +1,7 @@
+export type GameSessionData = { answers: Map<string, number> };
+
+export interface GameSessionStore {
+  create(sessionId: string, data: GameSessionData): Promise<void>;
+  get(sessionId: string): Promise<GameSessionData | null>;
+  delete(sessionId: string): Promise<void>;
+}
diff --git a/apps/api/src/gameSessionStore/InMemoryGameSessionStore.ts b/apps/api/src/gameSessionStore/InMemoryGameSessionStore.ts
new file mode 100644
index 0000000..d4a339c
--- /dev/null
+++ b/apps/api/src/gameSessionStore/InMemoryGameSessionStore.ts
@@ -0,0 +1,17 @@
+import type { GameSessionStore, GameSessionData } from "./GameSessionStore.js";
+
+export class InMemoryGameSessionStore implements GameSessionStore {
+  private sessions = new Map<string, GameSessionData>();
+
+  async create(sessionId: string, data: GameSessionData): Promise<void> {
+    this.sessions.set(sessionId, data);
+  }
+
+  async get(sessionId: string): Promise<GameSessionData | null> {
+    return this.sessions.get(sessionId) ?? null;
+  }
+
+  async delete(sessionId: string): Promise<void> {
+    this.sessions.delete(sessionId);
+  }
+}
diff --git a/apps/api/src/gameSessionStore/index.ts b/apps/api/src/gameSessionStore/index.ts
new file mode 100644
index 0000000..c01f457
--- /dev/null
+++ b/apps/api/src/gameSessionStore/index.ts
@@ -0,0 +1,2 @@
+export type { GameSessionStore, GameSessionData } from "./GameSessionStore.js";
+export { InMemoryGameSessionStore } from "./InMemoryGameSessionStore.js";
diff --git a/apps/api/tsconfig.json b/apps/api/tsconfig.json
index 2a60b18..52192c0 100644
--- a/apps/api/tsconfig.json
+++ b/apps/api/tsconfig.json
@@ -2,7 +2,7 @@
   "extends": "../../tsconfig.base.json",
   "references": [
     { "path": "../../packages/shared" },
-    { "path": "../../packages/db" }
+    { "path": "../../packages/db" },
   ],
   "compilerOptions": {
     "module": "NodeNext",
@@ -10,7 +10,7 @@
     "outDir": "./dist",
     "resolveJsonModule": true,
     "rootDir": ".",
-    "types": ["vitest/globals"]
+    "types": ["vitest/globals"],
   },
-  "include": ["src", "vitest.config.ts", "../../packages/db/src/models"]
+  "include": ["src", "vitest.config.ts"],
 }
diff --git a/package.json b/package.json
index 2fbc788..704311f 100644
--- a/package.json
+++ b/package.json
@@ -4,6 +4,7 @@
   "description": "a vocabulary trainer",
   "private": true,
   "scripts": {
+    "build": "pnpm --filter @glossa/shared build && pnpm --filter @glossa/db build",
     "dev": "concurrently --names \"api,web\" -c \"magenta.bold,green.bold\" \"pnpm --filter @glossa/api dev\" \"pnpm --filter @glossa/web dev\"",
     "test": "vitest",
     "test:run": "vitest run",
diff --git a/packages/db/src/generating-deck.ts b/packages/db/src/generating-deck.ts
index 4699047..5bd63d4 100644
--- a/packages/db/src/generating-deck.ts
+++ b/packages/db/src/generating-deck.ts
@@ -103,7 +103,7 @@ const createDeck = async (tx: DbOrTx, validatedLanguages: string[]) => {
       description: config.deckDescription,
       source_language: config.sourceLanguage,
       validated_languages: validatedLanguages,
-      is_public: false,
+      type: "core",
     })
     .returning({ id: decks.id });
   const created = result[0];