diff --git a/app/api/study_cards.py b/app/api/study_cards.py
index 4e14f7e..a2c5898 100644
--- a/app/api/study_cards.py
+++ b/app/api/study_cards.py
@@ -28,7 +28,7 @@ from models.study_memo_card_progress import StudyMemoCardProgress, rate_card
 from models.study_question import StudyQuestion
 from models.user import User
 from services.study.card_normalize import compute_dedup_hash
-from services.study.publish_enqueue import enqueue_card_publish
+from services.study.publish_enqueue import enqueue_card_progress_publish, enqueue_card_publish
 
 router = APIRouter()
 
@@ -321,6 +321,9 @@ async def rate(
     if outcome is None:
         raise HTTPException(status_code=422, detail=f"invalid outcome: {body.outcome!r}")
     progress = await rate_card(session, card=card, outcome=outcome, now=datetime.now(timezone.utc))
+    # 카드 SR 상태 발행(같은 tx, flag off=no-op) — ALL row(sentinel/terminal 포함). S-4.
+    if settings.study_publish_enabled:
+        await enqueue_card_progress_publish(session, progress)
     await session.commit()
     return RateResult(
         card_id=card.id, outcome=outcome, review_stage=progress.review_stage, due_at=progress.due_at
diff --git a/app/services/study/publish_enqueue.py b/app/services/study/publish_enqueue.py
index fa3ac9f..40698fe 100644
--- a/app/services/study/publish_enqueue.py
+++ b/app/services/study/publish_enqueue.py
@@ -19,16 +19,19 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from models.published import PublishOutbox
 from models.study_memo_card import StudyMemoCard
+from models.study_memo_card_progress import StudyMemoCardProgress
 from models.study_question import StudyQuestion
 from models.study_topic import StudyTopic
 from services.study.publish_projection import (
     KIND_CARD,
+    KIND_CARD_PROGRESS,
     KIND_EXPLANATION,
     KIND_QUESTION,
     KIND_TOPIC,
     SCHEMA_VERSION,
     payload_hash,
     project_card,
+    project_card_progress,
     project_explanation,
     project_question,
     project_topic,
@@ -140,3 +143,32 @@ async def backfill_publish_cards(session: AsyncSession, *, after_id: int = 0, li
     for c in rows:
         await enqueue_card_publish(session, c)
     return len(rows)
+
+
+async def enqueue_card_progress_publish(session: AsyncSession, progress: Any) -> None:
+    """카드 SR progress row 발행(S-4). caller commit. rate_card 결과(ALL row, sentinel/terminal 포함)."""
+    await enqueue_publish(
+        session,
+        kind=KIND_CARD_PROGRESS,
+        source_id=progress.id,
+        payload=project_card_progress(progress),
+    )
+
+
+async def backfill_publish_card_progress(session: AsyncSession, *, after_id: int = 0, limit: int = 200) -> int:
+    """모든 card progress row 를 id>after_id 부터 bounded 로 outbox 적재(S-4 초기 백필).
+
+    ★필터 없음 = ALL row(due_at NULL sentinel·terminal 포함) — due-only 백필은 sentinel 누락.
+    반환 = enqueue 한 row 수(0 이면 끝). 멱등 = 워커 디둡. caller commit.
+    """
+    rows = (
+        await session.execute(
+            select(StudyMemoCardProgress)
+            .where(StudyMemoCardProgress.id > after_id)
+            .order_by(StudyMemoCardProgress.id.asc())
+            .limit(limit)
+        )
+    ).scalars().all()
+    for p in rows:
+        await enqueue_card_progress_publish(session, p)
+    return len(rows)
diff --git a/app/services/study/publish_projection.py b/app/services/study/publish_projection.py
index c763422..1404cdb 100644
--- a/app/services/study/publish_projection.py
+++ b/app/services/study/publish_projection.py
@@ -21,6 +21,7 @@ KIND_QUESTION = "study_question"
 KIND_EXPLANATION = "study_explanation"
 KIND_TOPIC = "study_topic"
 KIND_CARD = "study_card"  # ★뷰어 pubstudy.ts 의 KIND_CARD 와 일치 필수(S-3 forward-contract).
+KIND_CARD_PROGRESS = "study_card_progress"  # 카드 SR 상태 read model (S-4, viewer C-4 소비).
 
 
 def payload_hash(payload: dict[str, Any]) -> str:
@@ -77,6 +78,25 @@ def project_card(c: Any) -> dict[str, Any]:
     }
 
 
+def project_card_progress(p: Any) -> dict[str, Any]:
+    """study_memo_card_progress → 발행 payload (S-4) = 카드 SR 상태 read model.
+
+    ★ALL row 발행(due_at NULL sentinel=암-on-new · terminal=졸업 포함). due-only 발행하면
+    sentinel 누락 → viewer 가 '미확인' 오분류. SR 계산은 DS(sr_schedule), 여긴 결과만.
+    card_id = pub_card 의 source_id(=DS card.id) → viewer C-4 가 pub_card LEFT JOIN 하는 키.
+    """
+    due = getattr(p, "due_at", None)
+    rev = getattr(p, "last_reviewed_at", None)
+    return {
+        "card_id": p.card_id,
+        "topic_id": p.study_topic_id,
+        "last_outcome": p.last_outcome,
+        "last_reviewed_at": rev.isoformat() if rev else None,
+        "due_at": due.isoformat() if due else None,
+        "review_stage": p.review_stage,
+    }
+
+
 def project_topic(t: Any) -> dict[str, Any]:
     """study_topic → 발행 payload (S-1, plan study-viewer-port).
 
diff --git a/scripts/backfill_publish_card_progress.py b/scripts/backfill_publish_card_progress.py
new file mode 100644
index 0000000..9d098e6
--- /dev/null
+++ b/scripts/backfill_publish_card_progress.py
@@ -0,0 +1,61 @@
+"""S-4 초기 백필 — 모든 study_memo_card_progress row 를 발행 outbox 에 적재.
+
+★ALL row(필터 없음) — due_at NULL sentinel(암-on-new)·terminal(졸업) 포함. due-only 백필은
+sentinel 누락 → viewer 미확인 오분류. 멱등(워커 (payload_hash, deleted) 디둡). flag on 시 워커 drain.
+
+실행 (GPU 서버):
+  docker exec hyungi_document_server-fastapi-1 python /app/scripts/backfill_publish_card_progress.py
+  docker exec hyungi_document_server-fastapi-1 python /app/scripts/backfill_publish_card_progress.py --dry-run
+"""
+
+import argparse
+import asyncio
+import os
+import sys
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
+
+from sqlalchemy import func, select
+
+from core.config import settings
+from core.database import async_session
+from models.study_memo_card_progress import StudyMemoCardProgress
+from services.study.publish_enqueue import backfill_publish_card_progress
+
+# 개인 학습툴 progress row 대비 넉넉. 도달 시 가드 경보.
+PAGE = 100000
+
+
+async def run(dry_run: bool) -> None:
+    async with async_session() as session:
+        total = (
+            await session.execute(
+                select(func.count()).select_from(StudyMemoCardProgress)
+            )
+        ).scalar() or 0
+
+    print(f"[info] study_publish_enabled={settings.study_publish_enabled} "
+          f"(False 면 적재는 되나 워커가 drain 안 함)")
+    print(f"[info] card progress row {total}건 (ALL row 발행)")
+    if dry_run:
+        print("[dry-run] 적재 안 함. 실제 실행은 --dry-run 제거.")
+        return
+
+    async with async_session() as session:
+        n = await backfill_publish_card_progress(session, after_id=0, limit=PAGE)
+        await session.commit()
+
+    print(f"\n[ok] outbox 적재 {n}건 — 발행 워커가 drain(flag on 시) 하며 rev 부여.")
+    if n >= PAGE:
+        print(f"[warn] PAGE({PAGE}) 도달 — progress 가 더 있을 수 있음. after_id 페이징 추가 필요.")
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description="S-4 pub_card_progress 초기 백필")
+    parser.add_argument("--dry-run", action="store_true", default=False)
+    args = parser.parse_args()
+    asyncio.run(run(args.dry_run))
+
+
+if __name__ == "__main__":
+    main()