45 lines
1.5 KiB
Python
45 lines
1.5 KiB
Python
"""SQLAlchemy ORM models for ELO rating tables."""
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from sqlalchemy import Column, DateTime, Float, Integer, String
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from sqlalchemy.sql import func
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from app.config import settings
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from app.database import Base
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class EloRating(Base):
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"""Tracks the current ELO rating for each listing."""
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__tablename__ = "ratings"
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__table_args__ = {"schema": settings.ELO_SCHEMA}
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global_id = Column(String, primary_key=True)
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elo_rating = Column(Float, nullable=False, default=settings.DEFAULT_ELO)
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comparison_count = Column(Integer, nullable=False, default=0)
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wins = Column(Integer, nullable=False, default=0)
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losses = Column(Integer, nullable=False, default=0)
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created_at = Column(DateTime(timezone=True), server_default=func.now())
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updated_at = Column(
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DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
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)
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class Comparison(Base):
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"""Records each pairwise comparison with ELO snapshots."""
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__tablename__ = "comparisons"
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__table_args__ = {"schema": settings.ELO_SCHEMA}
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id = Column(Integer, primary_key=True, autoincrement=True)
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listing_a_id = Column(String, nullable=False)
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listing_b_id = Column(String, nullable=False)
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winner_id = Column(String, nullable=False)
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elo_a_before = Column(Float, nullable=False)
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elo_b_before = Column(Float, nullable=False)
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elo_a_after = Column(Float, nullable=False)
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elo_b_after = Column(Float, nullable=False)
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created_at = Column(DateTime(timezone=True), server_default=func.now())
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