feat(api): add findings severity timeseries endpoint (#9363)

api/src/backend/tasks/tasks.py

@@ -10,6 +10,7 @@ from config.django.base import DJANGO_FINDINGS_BATCH_SIZE, DJANGO_TMP_OUTPUT_DIR
 from django_celery_beat.models import PeriodicTask
 from tasks.jobs.backfill import (
     backfill_compliance_summaries,
+    backfill_daily_severity_summaries,
     backfill_resource_scan_summaries,
 )
 from tasks.jobs.connection import (
@@ -38,6 +39,7 @@ from tasks.jobs.muting import mute_historical_findings
 from tasks.jobs.report import generate_compliance_reports_job
 from tasks.jobs.scan import (
     aggregate_attack_surface,
+    aggregate_daily_severity,
     aggregate_findings,
     create_compliance_requirements,
     perform_prowler_scan,
@@ -75,8 +77,11 @@ def _perform_scan_complete_tasks(tenant_id: str, scan_id: str, provider_id: str)
     )
     chain(
         perform_scan_summary_task.si(tenant_id=tenant_id, scan_id=scan_id),
-        generate_outputs_task.si(
-            scan_id=scan_id, provider_id=provider_id, tenant_id=tenant_id
+        group(
+            aggregate_daily_severity_task.si(tenant_id=tenant_id, scan_id=scan_id),
+            generate_outputs_task.si(
+                scan_id=scan_id, provider_id=provider_id, tenant_id=tenant_id
+            ),
         ),
         group(
             # Use optimized task that generates both reports with shared queries
@@ -523,6 +528,12 @@ def backfill_compliance_summaries_task(tenant_id: str, scan_id: str):
     return backfill_compliance_summaries(tenant_id=tenant_id, scan_id=scan_id)
 
 
+@shared_task(name="backfill-daily-severity-summaries", queue="backfill")
+def backfill_daily_severity_summaries_task(tenant_id: str, days: int = None):
+    """Backfill DailySeveritySummary from historical scans. Use days param to limit scope."""
+    return backfill_daily_severity_summaries(tenant_id=tenant_id, days=days)
+
+
 @shared_task(base=RLSTask, name="scan-compliance-overviews", queue="compliance")
 @handle_provider_deletion
 def create_compliance_requirements_task(tenant_id: str, scan_id: str):
@@ -556,6 +567,13 @@ def aggregate_attack_surface_task(tenant_id: str, scan_id: str):
     return aggregate_attack_surface(tenant_id=tenant_id, scan_id=scan_id)
 
 
+@shared_task(name="scan-daily-severity", queue="overview")
+@handle_provider_deletion
+def aggregate_daily_severity_task(tenant_id: str, scan_id: str):
+    """Aggregate scan severity into DailySeveritySummary for findings_severity/timeseries endpoint."""
+    return aggregate_daily_severity(tenant_id=tenant_id, scan_id=scan_id)
+
+
 @shared_task(base=RLSTask, name="lighthouse-connection-check")
 @set_tenant
 def check_lighthouse_connection_task(lighthouse_config_id: str, tenant_id: str = None):