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plugins/importer/models.py

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+from datetime import datetime
+from plugins.plant.models import db
+
+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'),
+    )