from app.extensions import db
from datetime import datetime


class FxRate(db.Model):
    __tablename__ = 'fx_rates'

    id = db.Column(db.Integer, primary_key=True)
    date = db.Column(db.Date, nullable=False, unique=True, index=True)
    usd_to_vnd = db.Column(db.Numeric(12, 2), nullable=False)
    source = db.Column(db.String(50), nullable=True)  # 'exchangerate-api' | 'vcb' | 'manual'
    fetched_at = db.Column(db.DateTime, default=datetime.utcnow)

    def __repr__(self):
        return f'<FxRate {self.date} 1USD={self.usd_to_vnd}VND>'