diff --git a/backend/app/services/reports.py b/backend/app/services/reports.py
index ce08c7c..afbe389 100644
--- a/backend/app/services/reports.py
+++ b/backend/app/services/reports.py
@@ -76,13 +76,19 @@ async def get_or_issue(
         latest_call_at = max(
             (aware_datetime(call.ended_at) for call in calls if call.ended_at), default=None
         )
-        if existing and (
-            to_date < date.today()
-            or latest_call_at is None
-            or latest_call_at <= aware_datetime(existing.issued_at)
+        analyzed_ids = [call.id for call in calls if call.state == "ANALYZED"]
+        # 분석은 통화가 끝나고 몇 분 뒤에 끝난다. 그 사이에 만든 스냅샷은 종료 시각만 보면
+        # 최신으로 보이므로, 분석된 통화 수가 달라졌으면(지난 기간도) 다시 만든다.
+        if (
+            existing
+            and existing.snapshot.get("analyzedCallCount") == len(analyzed_ids)
+            and (
+                to_date < date.today()
+                or latest_call_at is None
+                or latest_call_at <= aware_datetime(existing.issued_at)
+            )
         ):
             return {**existing.snapshot, "issuedAt": existing.issued_at}
-        analyzed_ids = [call.id for call in calls if call.state == "ANALYZED"]
         extractions = []
         features = []
         signals = []
diff --git a/backend/tests/test_report_snapshot.py b/backend/tests/test_report_snapshot.py
new file mode 100644
index 0000000..642571a
--- /dev/null
+++ b/backend/tests/test_report_snapshot.py
@@ -0,0 +1,84 @@
+from __future__ import annotations
+
+from collections.abc import AsyncIterator
+from datetime import UTC, datetime, timedelta
+from pathlib import Path
+
+import pytest
+from sqlalchemy import update
+
+from app.database import Database
+from app.models import CallRecord, CallState, User
+from app.services.reports import ReportService, aware_datetime, period_bounds
+
+
+@pytest.fixture
+async def database(tmp_path: Path) -> AsyncIterator[Database]:
+    database = Database(f"sqlite+aiosqlite:///{tmp_path / 'snapshot.db'}")
+    await database.ensure_schema(auto_reset=True)
+    yield database
+    await database.close()
+
+
+async def seed_processing_call(database: Database, ended_at: datetime) -> tuple[str, str]:
+    async with database.sessions() as session:
+        parent = User(phone="01012345678", name="Parent", role="PARENT")
+        child = User(phone="01087654321", name="Child", role="CHILD")
+        session.add_all([parent, child])
+        await session.flush()
+        call = CallRecord(
+            parent_id=parent.id,
+            child_id=child.id,
+            room_name="snapshot-test",
+            state=CallState.PROCESSING.value,
+            ended_at=ended_at,
+        )
+        session.add(call)
+        await session.commit()
+        return call.id, parent.id
+
+
+async def finish_analysis(database: Database, call_id: str) -> None:
+    async with database.sessions() as session:
+        await session.execute(
+            update(CallRecord)
+            .where(CallRecord.id == call_id)
+            .values(state=CallState.ANALYZED.value)
+        )
+        await session.commit()
+
+
+async def weekly(database: Database, parent_id: str, target) -> dict:
+    async with database.sessions() as session:
+        return await ReportService().get_or_issue(session, parent_id, "WEEKLY", target)
+
+
+@pytest.mark.asyncio
+async def test_report_issued_while_analysing_picks_up_the_call(database: Database) -> None:
+    # 통화가 끝나고 분석이 도는 동안 리포트를 열면 스냅샷이 먼저 저장된다. 분석이 끝난 뒤에는
+    # 그 통화의 종료 시각이 스냅샷보다 이르더라도 다시 만들어 새 분석을 넣어야 한다.
+    ended = datetime.now(UTC) - timedelta(minutes=5)
+    call_id, parent_id = await seed_processing_call(database, ended)
+    first = await weekly(database, parent_id, None)
+    assert first["analyzedCallCount"] == 0
+
+    await finish_analysis(database, call_id)
+    second = await weekly(database, parent_id, None)
+    assert second["analyzedCallCount"] == 1
+
+    # 바뀐 것이 없으면 저장된 스냅샷을 그대로 준다.
+    third = await weekly(database, parent_id, None)
+    assert aware_datetime(third["issuedAt"]) == aware_datetime(second["issuedAt"])
+
+
+@pytest.mark.asyncio
+async def test_past_week_report_picks_up_late_analysis(database: Database) -> None:
+    # 일요일 밤 통화의 분석이 월요일에 끝나도 지난주 리포트에 들어가야 한다.
+    last_week_start, _ = period_bounds("WEEKLY", (datetime.now(UTC) - timedelta(days=7)).date())
+    ended = datetime.combine(last_week_start + timedelta(days=2), datetime.min.time(), tzinfo=UTC)
+    call_id, parent_id = await seed_processing_call(database, ended)
+    target = last_week_start + timedelta(days=2)
+    assert (await weekly(database, parent_id, target))["analyzedCallCount"] == 0
+
+    await finish_analysis(database, call_id)
+    assert (await weekly(database, parent_id, target))["analyzedCallCount"] == 1