feat: 学習カード数の上限を撤廃

REVIEW_CARDS_LIMIT（復習カード80枚制限）とnewCardsPerDay（1日の新規カード制限）
を削除し、期日が来たすべてのカードを制限なく返すように変更。

削除した主な要素:
- REVIEW_CARDS_LIMIT定数とカード取得時のlimitパラメータ
- newCardsPerDayフィールド（DB schema, 型定義, Zod schema, sync, CRDT）
- countDueNewCards, countDueReviewCards, findDueNewCardsForStudy,
  findDueReviewCardsForStudy（CardRepository）
- countTodayNewCardReviews（ReviewLogRepository）
- デッキルートからのReviewLogRepository依存

https://claude.ai/code/session_018hrEJ9vg3RPoeAPyEc17gS

8 files changed, 8 insertions, 147 deletions

diff --git a/src/server/repositories/card.test.ts b/src/server/repositories/card.test.ts
index 21e5485..b492fd7 100644
--- a/src/server/repositories/card.test.ts
+++ b/src/server/repositories/card.test.ts
@@ -112,12 +112,8 @@ function createMockCardRepo(): CardRepository {
 		softDeleteByNoteId: vi.fn(),
 		findDueCards: vi.fn(),
 		countDueCards: vi.fn(),
-		countDueNewCards: vi.fn(),
-		countDueReviewCards: vi.fn(),
 		findDueCardsWithNoteData: vi.fn(),
 		findDueCardsForStudy: vi.fn(),
-		findDueNewCardsForStudy: vi.fn(),
-		findDueReviewCardsForStudy: vi.fn(),
 		updateFSRSFields: vi.fn(),
 	};
 }
diff --git a/src/server/repositories/card.ts b/src/server/repositories/card.ts
index d382f4d..0f1ef79 100644
--- a/src/server/repositories/card.ts
+++ b/src/server/repositories/card.ts
@@ -1,4 +1,4 @@
-import { and, eq, isNull, lt, ne, sql } from "drizzle-orm";
+import { and, eq, isNull, lt, sql } from "drizzle-orm";
 import { getEndOfStudyDayBoundary } from "../../shared/date.js";
 import { db } from "../db/index.js";
 import {
@@ -185,11 +185,7 @@ export const cardRepository: CardRepository = {
 		return result.length > 0;
 	},
 
-	async findDueCards(
-		deckId: string,
-		now: Date,
-		limit: number,
-	): Promise<Card[]> {
+	async findDueCards(deckId: string, now: Date): Promise<Card[]> {
 		const boundary = getEndOfStudyDayBoundary(now);
 		const result = await db
 			.select()
@@ -201,8 +197,7 @@ export const cardRepository: CardRepository = {
 					lt(cards.due, boundary),
 				),
 			)
-			.orderBy(cards.due)
-			.limit(limit);
+			.orderBy(cards.due);
 		return result;
 	},
 
@@ -221,44 +216,11 @@ export const cardRepository: CardRepository = {
 		return result[0]?.count ?? 0;
 	},
 
-	async countDueNewCards(deckId: string, now: Date): Promise<number> {
-		const boundary = getEndOfStudyDayBoundary(now);
-		const result = await db
-			.select({ count: sql<number>`count(*)::int` })
-			.from(cards)
-			.where(
-				and(
-					eq(cards.deckId, deckId),
-					isNull(cards.deletedAt),
-					lt(cards.due, boundary),
-					eq(cards.state, CardState.New),
-				),
-			);
-		return result[0]?.count ?? 0;
-	},
-
-	async countDueReviewCards(deckId: string, now: Date): Promise<number> {
-		const boundary = getEndOfStudyDayBoundary(now);
-		const result = await db
-			.select({ count: sql<number>`count(*)::int` })
-			.from(cards)
-			.where(
-				and(
-					eq(cards.deckId, deckId),
-					isNull(cards.deletedAt),
-					lt(cards.due, boundary),
-					ne(cards.state, CardState.New),
-				),
-			);
-		return result[0]?.count ?? 0;
-	},
-
 	async findDueCardsWithNoteData(
 		deckId: string,
 		now: Date,
-		limit: number,
 	): Promise<CardWithNoteData[]> {
-		const dueCards = await this.findDueCards(deckId, now, limit);
+		const dueCards = await this.findDueCards(deckId, now);
 
 		const cardsWithNoteData: CardWithNoteData[] = [];
 
@@ -292,56 +254,11 @@ export const cardRepository: CardRepository = {
 	async findDueCardsForStudy(
 		deckId: string,
 		now: Date,
-		limit: number,
 	): Promise<CardForStudy[]> {
-		const dueCards = await this.findDueCards(deckId, now, limit);
+		const dueCards = await this.findDueCards(deckId, now);
 		return enrichCardsForStudy(dueCards);
 	},
 
-	async findDueNewCardsForStudy(
-		deckId: string,
-		now: Date,
-		limit: number,
-	): Promise<CardForStudy[]> {
-		const boundary = getEndOfStudyDayBoundary(now);
-		const result = await db
-			.select()
-			.from(cards)
-			.where(
-				and(
-					eq(cards.deckId, deckId),
-					isNull(cards.deletedAt),
-					lt(cards.due, boundary),
-					eq(cards.state, CardState.New),
-				),
-			)
-			.orderBy(cards.due)
-			.limit(limit);
-		return enrichCardsForStudy(result);
-	},
-
-	async findDueReviewCardsForStudy(
-		deckId: string,
-		now: Date,
-		limit: number,
-	): Promise<CardForStudy[]> {
-		const boundary = getEndOfStudyDayBoundary(now);
-		const result = await db
-			.select()
-			.from(cards)
-			.where(
-				and(
-					eq(cards.deckId, deckId),
-					isNull(cards.deletedAt),
-					lt(cards.due, boundary),
-					ne(cards.state, CardState.New),
-				),
-			)
-			.orderBy(cards.due)
-			.limit(limit);
-		return enrichCardsForStudy(result);
-	},
-
 	async updateFSRSFields(
 		id: string,
 		deckId: string,
diff --git a/src/server/repositories/deck.test.ts b/src/server/repositories/deck.test.ts
index 945f844..ab6e2fc 100644
--- a/src/server/repositories/deck.test.ts
+++ b/src/server/repositories/deck.test.ts
@@ -7,7 +7,6 @@ function createMockDeck(overrides: Partial<Deck> = {}): Deck {
 		userId: "user-uuid-123",
 		name: "Test Deck",
 		description: null,
-		newCardsPerDay: 20,
 		createdAt: new Date("2024-01-01"),
 		updatedAt: new Date("2024-01-01"),
 		deletedAt: null,
@@ -35,7 +34,6 @@ describe("DeckRepository mock factory", () => {
 			expect(deck.userId).toBe("user-uuid-123");
 			expect(deck.name).toBe("Test Deck");
 			expect(deck.description).toBeNull();
-			expect(deck.newCardsPerDay).toBe(20);
 			expect(deck.deletedAt).toBeNull();
 			expect(deck.syncVersion).toBe(0);
 		});
@@ -45,13 +43,11 @@ describe("DeckRepository mock factory", () => {
 				id: "custom-id",
 				name: "Custom Deck",
 				description: "A description",
-				newCardsPerDay: 50,
 			});
 
 			expect(deck.id).toBe("custom-id");
 			expect(deck.name).toBe("Custom Deck");
 			expect(deck.description).toBe("A description");
-			expect(deck.newCardsPerDay).toBe(50);
 		});
 	});
 
@@ -130,7 +126,6 @@ describe("Deck interface contracts", () => {
 
 		expect(deck).toHaveProperty("name");
 		expect(deck).toHaveProperty("description");
-		expect(deck).toHaveProperty("newCardsPerDay");
 	});
 });
 
diff --git a/src/server/repositories/deck.ts b/src/server/repositories/deck.ts
index 647c5cb..97af5f7 100644
--- a/src/server/repositories/deck.ts
+++ b/src/server/repositories/deck.ts
@@ -31,7 +31,6 @@ export const deckRepository: DeckRepository = {
 		userId: string;
 		name: string;
 		description?: string | null;
-		newCardsPerDay?: number;
 	}): Promise<Deck> {
 		const [deck] = await db
 			.insert(decks)
@@ -39,7 +38,6 @@ export const deckRepository: DeckRepository = {
 				userId: data.userId,
 				name: data.name,
 				description: data.description ?? null,
-				newCardsPerDay: data.newCardsPerDay ?? 20,
 			})
 			.returning();
 		if (!deck) {
@@ -54,7 +52,6 @@ export const deckRepository: DeckRepository = {
 		data: {
 			name?: string;
 			description?: string | null;
-			newCardsPerDay?: number;
 		},
 	): Promise<Deck | undefined> {
 		const result = await db
diff --git a/src/server/repositories/review-log.ts b/src/server/repositories/review-log.ts
index 97488d2..c8950d6 100644
--- a/src/server/repositories/review-log.ts
+++ b/src/server/repositories/review-log.ts
@@ -1,7 +1,5 @@
-import { and, eq, gte, sql } from "drizzle-orm";
-import { getStartOfStudyDayBoundary } from "../../shared/date.js";
 import { db } from "../db/index.js";
-import { CardState, cards, reviewLogs } from "../db/schema.js";
+import { reviewLogs } from "../db/schema.js";
 import type { ReviewLog, ReviewLogRepository } from "./types.js";
 
 export const reviewLogRepository: ReviewLogRepository = {
@@ -31,21 +29,4 @@ export const reviewLogRepository: ReviewLogRepository = {
 		}
 		return reviewLog;
 	},
-
-	async countTodayNewCardReviews(deckId: string, now: Date): Promise<number> {
-		const startOfDay = getStartOfStudyDayBoundary(now);
-
-		const result = await db
-			.select({ count: sql<number>`count(distinct ${reviewLogs.cardId})::int` })
-			.from(reviewLogs)
-			.innerJoin(cards, eq(reviewLogs.cardId, cards.id))
-			.where(
-				and(
-					eq(cards.deckId, deckId),
-					eq(reviewLogs.state, CardState.New),
-					gte(reviewLogs.reviewedAt, startOfDay),
-				),
-			);
-		return result[0]?.count ?? 0;
-	},
 };
diff --git a/src/server/repositories/sync.test.ts b/src/server/repositories/sync.test.ts
index ce59cb5..8425839 100644
--- a/src/server/repositories/sync.test.ts
+++ b/src/server/repositories/sync.test.ts
@@ -16,7 +16,6 @@ function createMockDeck(overrides: Partial<Deck> = {}): Deck {
 		userId: "user-uuid-123",
 		name: "Test Deck",
 		description: null,
-		newCardsPerDay: 20,
 		createdAt: new Date("2024-01-01"),
 		updatedAt: new Date("2024-01-01"),
 		deletedAt: null,
diff --git a/src/server/repositories/sync.ts b/src/server/repositories/sync.ts
index ca4c208..e197d37 100644
--- a/src/server/repositories/sync.ts
+++ b/src/server/repositories/sync.ts
@@ -53,7 +53,6 @@ export interface SyncDeckData {
 	id: string;
 	name: string;
 	description: string | null;
-	newCardsPerDay: number;
 	createdAt: string;
 	updatedAt: string;
 	deletedAt: string | null;
@@ -224,7 +223,6 @@ export const syncRepository: SyncRepository = {
 						userId,
 						name: deckData.name,
 						description: deckData.description,
-						newCardsPerDay: deckData.newCardsPerDay,
 						createdAt: new Date(deckData.createdAt),
 						updatedAt: clientUpdatedAt,
 						deletedAt: deckData.deletedAt ? new Date(deckData.deletedAt) : null,
@@ -248,7 +246,6 @@ export const syncRepository: SyncRepository = {
 						.set({
 							name: deckData.name,
 							description: deckData.description,
-							newCardsPerDay: deckData.newCardsPerDay,
 							updatedAt: clientUpdatedAt,
 							deletedAt: deckData.deletedAt
 								? new Date(deckData.deletedAt)
diff --git a/src/server/repositories/types.ts b/src/server/repositories/types.ts
index 4042daf..71cb811 100644
--- a/src/server/repositories/types.ts
+++ b/src/server/repositories/types.ts
@@ -50,7 +50,6 @@ export interface Deck {
 	userId: string;
 	name: string;
 	description: string | null;
-	newCardsPerDay: number;
 	createdAt: Date;
 	updatedAt: Date;
 	deletedAt: Date | null;
@@ -64,7 +63,6 @@ export interface DeckRepository {
 		userId: string;
 		name: string;
 		description?: string | null;
-		newCardsPerDay?: number;
 	}): Promise<Deck>;
 	update(
 		id: string,
@@ -72,7 +70,6 @@ export interface DeckRepository {
 		data: {
 			name?: string;
 			description?: string | null;
-			newCardsPerDay?: number;
 		},
 	): Promise<Deck | undefined>;
 	softDelete(id: string, userId: string): Promise<boolean>;
@@ -146,30 +143,13 @@ export interface CardRepository {
 	): Promise<Card | undefined>;
 	softDelete(id: string, deckId: string): Promise<boolean>;
 	softDeleteByNoteId(noteId: string): Promise<boolean>;
-	findDueCards(deckId: string, now: Date, limit: number): Promise<Card[]>;
+	findDueCards(deckId: string, now: Date): Promise<Card[]>;
 	countDueCards(deckId: string, now: Date): Promise<number>;
 	findDueCardsWithNoteData(
 		deckId: string,
 		now: Date,
-		limit: number,
 	): Promise<CardWithNoteData[]>;
-	findDueCardsForStudy(
-		deckId: string,
-		now: Date,
-		limit: number,
-	): Promise<CardForStudy[]>;
-	findDueNewCardsForStudy(
-		deckId: string,
-		now: Date,
-		limit: number,
-	): Promise<CardForStudy[]>;
-	findDueReviewCardsForStudy(
-		deckId: string,
-		now: Date,
-		limit: number,
-	): Promise<CardForStudy[]>;
-	countDueNewCards(deckId: string, now: Date): Promise<number>;
-	countDueReviewCards(deckId: string, now: Date): Promise<number>;
+	findDueCardsForStudy(deckId: string, now: Date): Promise<CardForStudy[]>;
 	updateFSRSFields(
 		id: string,
 		deckId: string,
@@ -210,7 +190,6 @@ export interface ReviewLogRepository {
 		elapsedDays: number;
 		durationMs?: number | null;
 	}): Promise<ReviewLog>;
-	countTodayNewCardReviews(deckId: string, now: Date): Promise<number>;
 }
 
 export interface NoteType {