D09: Import record event history for revision tracking

- Add ImportRecordEvent model to track per-record import changes
- Log created/updated events for each official record import
- Add alembic migration 0014 for import_record_event table
- Enables audit trail for which import run modified which records

apps/api/app/models.py

@@ -212,3 +212,15 @@ class ExternalEntityAlias(Base):
     updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True))
     fish: Mapped[Fish | None] = relationship()
     waterbody: Mapped[Waterbody | None] = relationship()
+
+
+class ImportRecordEvent(Base):
+    """Track per-record import events for D09 revision history."""
+    __tablename__ = "import_record_event"
+    id: Mapped[uuid.UUID] = mapped_column(primary_key=True, default=uuid.uuid4)
+    catch_report_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("catch_report.id"), index=True)
+    import_run_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("official_record_import.id"), index=True)
+    event_type: Mapped[str] = mapped_column(String(20))  # created/updated/deleted
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True))
+    catch_report: Mapped[CatchReport] = relationship()
+    import_run: Mapped[OfficialRecordImport] = relationship()