45 lines
1.8 KiB
Python
45 lines
1.8 KiB
Python
"""Модель участника сеанса конференции — метки времени присутствия и identity (ADR-001, п.6)."""
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import uuid
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from datetime import datetime
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from sqlalchemy import CheckConstraint, DateTime, ForeignKey, Index, text
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from sqlalchemy.dialects.postgresql import UUID
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from sqlalchemy.orm import Mapped, mapped_column
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from models.base import Base
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class ConferenceParticipant(Base):
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"""Временное окно присутствия участника (пользователя ИЛИ гостя) в сеансе.
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Ровно одно из `user_id`/`guest_id` заполнено (CHECK) — зарегистрированный
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участник и гость взаимоисключающие identity одной строки.
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"""
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__tablename__ = "conference_participants"
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__table_args__ = (
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Index("ix_conference_participants_session_id", "session_id"),
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CheckConstraint(
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"(user_id IS NOT NULL)::int + (guest_id IS NOT NULL)::int = 1",
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name="ck_conference_participants_exactly_one_identity",
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),
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)
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id: Mapped[uuid.UUID] = mapped_column(
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UUID(as_uuid=True), primary_key=True, server_default=text("gen_random_uuid()")
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)
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session_id: Mapped[uuid.UUID] = mapped_column(
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UUID(as_uuid=True),
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ForeignKey("conference_sessions.id", ondelete="CASCADE"),
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nullable=False,
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)
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user_id: Mapped[uuid.UUID | None] = mapped_column(
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UUID(as_uuid=True), ForeignKey("users.id"), nullable=True
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)
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guest_id: Mapped[uuid.UUID | None] = mapped_column(
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UUID(as_uuid=True), ForeignKey("guest_access.id"), nullable=True
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)
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joined_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
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left_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
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