from datetime import datetime
from app import db    # ← changed from plugins.plant.models

class ImportBatch(db.Model):
    __tablename__ = 'import_batches'

    id           = db.Column(db.Integer, primary_key=True)
    export_id    = db.Column(db.String(64), nullable=False)
    user_id      = db.Column(db.Integer, nullable=False, index=True)
    imported_at  = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)

    __table_args__ = (
        # ensure a given user can’t import the same export twice
        db.UniqueConstraint('export_id', 'user_id', name='uix_export_user'),
    )