Initial commit: habit tracker PWA with Google OAuth, push notifications

FastAPI + SQLAlchemy/Alembic + MariaDB backend with Jinja2/htmx/Alpine
server-rendered frontend. Multi-user via Google OAuth, daily habit
tracking, monthly/weekly history views, Web Push reminders via
APScheduler, and PWA support (manifest, service worker, offline caching).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/models/notification_log.py

@@ -0,0 +1,33 @@
+from datetime import date, datetime
+
+from sqlalchemy import Date, ForeignKey, Integer, String, UniqueConstraint
+from sqlalchemy.orm import Mapped, mapped_column
+from sqlalchemy.sql import func
+
+from app.database import Base
+
+
+class HabitNotificationLog(Base):
+    __tablename__ = "habit_notification_log"
+    __table_args__ = (UniqueConstraint("habit_id", "notify_date", name="uq_notification_habit_date"),)
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    habit_id: Mapped[int] = mapped_column(ForeignKey("habit.id", ondelete="CASCADE"), nullable=False)
+    notify_date: Mapped[date] = mapped_column(Date, nullable=False)
+    sent_at: Mapped[datetime] = mapped_column(server_default=func.now(), nullable=False)
+
+
+class SummaryNotificationLog(Base):
+    """주간/월간 요약 알림 중복 발송 방지용 클레임 테이블 (habit_notification_log와 동일한 패턴).
+
+    period_type은 "weekly"/"monthly", period_start는 그 기간의 시작일(주간=월요일, 월간=1일)이다.
+    """
+
+    __tablename__ = "summary_notification_log"
+    __table_args__ = (UniqueConstraint("user_id", "period_type", "period_start", name="uq_summary_user_period"),)
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    user_id: Mapped[int] = mapped_column(ForeignKey("user.id", ondelete="CASCADE"), nullable=False)
+    period_type: Mapped[str] = mapped_column(String(20), nullable=False)
+    period_start: Mapped[date] = mapped_column(Date, nullable=False)
+    sent_at: Mapped[datetime] = mapped_column(server_default=func.now(), nullable=False)