feat: add mail source import history

backend/app/models/mail_source_import.py

@@ -0,0 +1,38 @@
+from datetime import datetime
+
+from sqlalchemy import Column, DateTime, ForeignKey, Integer, String, Text
+from sqlalchemy.orm import relationship
+
+from app.core.database import Base
+
+
+class MailSourceImport(Base):
+    """Sanitized audit record for one mail source import attempt."""
+
+    __tablename__ = "mail_source_imports"
+
+    id = Column(Integer, primary_key=True, index=True)
+    mail_source_id = Column(Integer, ForeignKey("mail_sources.id"), nullable=False, index=True)
+
+    trigger = Column(String, nullable=False, default="manual")
+    status = Column(String, nullable=False, index=True)
+
+    processed = Column(Integer, nullable=False, default=0)
+    reports_found = Column(Integer, nullable=False, default=0)
+    duplicate_reports = Column(Integer, nullable=False, default=0)
+    error_count = Column(Integer, nullable=False, default=0)
+
+    new_domains = Column(Text, nullable=True)
+    errors = Column(Text, nullable=True)
+
+    started_at = Column(DateTime, nullable=False, default=datetime.utcnow, index=True)
+    finished_at = Column(DateTime, nullable=False, default=datetime.utcnow, index=True)
+    created_at = Column(DateTime, nullable=False, default=datetime.utcnow)
+
+    mail_source = relationship("MailSource", back_populates="imports")
+
+    def __repr__(self):
+        return (
+            f"<MailSourceImport id={self.id} source={self.mail_source_id} "
+            f"status={self.status!r}>"
+        )