feat: SAC 0.7.0 display_name columns and event severity overrides

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/services/ingest.py

@@ -6,6 +6,7 @@ from sqlalchemy.orm import Session
 
 from app.models import Event, Host
 from app.services.daily_report_format import normalize_daily_report_details
+from app.services.event_severity_overrides import apply_severity_override
 
 DAILY_REPORT_TYPES = frozenset({"report.daily.ssh", "report.daily.rdp"})
 
@@ -75,6 +76,7 @@ def ingest_event(db: Session, payload: dict) -> tuple[Event, bool]:
         return existing, False
 
     host = upsert_host(db, payload)
+    payload = apply_severity_override(payload, db)
     details = payload.get("details")
     if payload.get("type") in DAILY_REPORT_TYPES:
         details = normalize_daily_report_details(details, host, payload["type"])