G7 증명과 G8 clean-head 승격 준비

apps/api/app/session_read_model.py

@@ -10,7 +10,7 @@ from __future__ import annotations
 import re
 from collections import Counter
 from dataclasses import dataclass
-from datetime import datetime
+from datetime import datetime, timedelta, timezone
 from typing import Any, Literal, Optional, cast
 
 from pydantic import BaseModel, Field
@@ -31,6 +31,7 @@ WorksheetItemSpec = tuple[str, str, list[str], WorksheetSpeaker | None]
 WorksheetSectionSpec = tuple[str, str, list[WorksheetItemSpec]]
 
 LEARNER_VISIBLE_AI_ROLE = "counselor"
+KOREA_STANDARD_TIME = timezone(timedelta(hours=9), name="KST")
 MISSING_SESSION_EVALUATION_GRACE_SECONDS = 30.0
 MISSING_SESSION_EVALUATION_ERROR = (
     "회기말 평가가 제한 시간 이후에도 저장되지 않았습니다. AI 평가 재시도가 필요합니다."
@@ -478,7 +479,11 @@ def stage_label(stage: object) -> StageLabel:
 def iso(ts: float | None) -> str | None:
     if ts is None:
         return None
-    return datetime.fromtimestamp(ts).isoformat(timespec="seconds")
+    return datetime.fromtimestamp(ts, tz=timezone.utc).isoformat(timespec="seconds")
+
+
+def session_calendar_date(ts: float) -> str:
+    return datetime.fromtimestamp(ts, tz=KOREA_STANDARD_TIME).strftime("%Y-%m-%d")
 
 
 def learner_visible_turns(sess: InProcSession) -> list[TurnRecord]:
@@ -1757,7 +1762,7 @@ def build_session_review(read_input: SessionReviewReadInput) -> SessionReviewRes
             initial=client_initial,
             persona=_persona_label(sess.persona_code, str(sess.persona.difficulty)),
         ),
-        date=datetime.fromtimestamp(sess.created_at).strftime("%Y-%m-%d"),
+        date=session_calendar_date(sess.created_at),
         durationLabel=_duration_label(duration_seconds),
         durationSeconds=duration_seconds,
         reachedPhase=reached_phase,