Initial project scaffold

Full-stack homeschool web app with FastAPI backend, Vue 3 frontend,
MySQL database, and Docker Compose orchestration. Includes JWT auth,
WebSocket real-time TV dashboard, schedule builder, activity logging,
and multi-child support.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/models/session.py

@@ -0,0 +1,55 @@
+from datetime import date, datetime
+from sqlalchemy import Date, DateTime, ForeignKey, String, func
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from app.models.base import Base, TimestampMixin
+import enum
+
+
+class TimerEventType(str, enum.Enum):
+    start = "start"
+    pause = "pause"
+    resume = "resume"
+    complete = "complete"
+    skip = "skip"
+
+
+class DailySession(TimestampMixin, Base):
+    __tablename__ = "daily_sessions"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    child_id: Mapped[int] = mapped_column(ForeignKey("children.id", ondelete="CASCADE"), nullable=False)
+    template_id: Mapped[int | None] = mapped_column(
+        ForeignKey("schedule_templates.id", ondelete="SET NULL"), nullable=True
+    )
+    session_date: Mapped[date] = mapped_column(Date, nullable=False)
+    is_active: Mapped[bool] = mapped_column(default=True)
+    current_block_id: Mapped[int | None] = mapped_column(
+        ForeignKey("schedule_blocks.id", ondelete="SET NULL"), nullable=True
+    )
+
+    child: Mapped["Child"] = relationship("Child", back_populates="daily_sessions")  # noqa: F821
+    template: Mapped["ScheduleTemplate | None"] = relationship(  # noqa: F821
+        "ScheduleTemplate", back_populates="daily_sessions"
+    )
+    current_block: Mapped["ScheduleBlock | None"] = relationship("ScheduleBlock", foreign_keys=[current_block_id])  # noqa: F821
+    timer_events: Mapped[list["TimerEvent"]] = relationship(
+        "TimerEvent", back_populates="session", cascade="all, delete-orphan"
+    )
+    activity_logs: Mapped[list["ActivityLog"]] = relationship(  # noqa: F821
+        "ActivityLog", back_populates="session"
+    )
+
+
+class TimerEvent(Base):
+    __tablename__ = "timer_events"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    session_id: Mapped[int] = mapped_column(ForeignKey("daily_sessions.id", ondelete="CASCADE"), nullable=False)
+    block_id: Mapped[int | None] = mapped_column(
+        ForeignKey("schedule_blocks.id", ondelete="SET NULL"), nullable=True
+    )
+    event_type: Mapped[str] = mapped_column(String(20), nullable=False)
+    occurred_at: Mapped[datetime] = mapped_column(DateTime, default=func.now(), server_default=func.now())
+
+    session: Mapped["DailySession"] = relationship("DailySession", back_populates="timer_events")
+    block: Mapped["ScheduleBlock | None"] = relationship("ScheduleBlock")  # noqa: F821