[Samk1710]

Resolves: #2472

• Add a new EPSSScore model and migration
• Add EPSSPipeline pipeline (ingests daily and prunes scores older than 90 days) and its tests
• Update advisory detail view & template to use EPSSScore
• Update rRelateSeveritiesPipeline
• Remove deprecated EPSS importer code

URL: http://127.0.0.1:8001/advisories/pysec/PYSEC-2006-1

Pipeline logs:

python manage.py improve epss_pipeline
Improving data using epss_pipeline
INFO 2026-10-28 14:34:11.034266 UTC Pipeline [EPSSPipeline] starting
INFO 2026-10-28 14:34:11.034443 UTC Step [fetch_and_bulk_load_scores] starting
INFO 2026-10-28 14:34:11.034520 UTC Fetching EPSS data from https://epss.cyentia.com/epss_scores-current.csv.gz
INFO 2026-10-28 14:34:18.670760 UTC Parsed 396,966 EPSS scores for 2026-10-28.
INFO 2026-10-28 14:34:46.795641 UTC Successfully inserted 396,966 EPSS scores for 2026-10-28
INFO 2026-10-28 14:34:46.943299 UTC Step [fetch_and_bulk_load_scores] completed in 36 seconds
INFO 2026-10-28 14:34:46.943478 UTC Step [prune_old_scores] starting
INFO 2026-10-28 14:34:46.999132 UTC Pruned 0 EPSS records older than 2026-07-30 (retention: 90 days)
INFO 2026-10-28 14:34:46.999325 UTC Step [prune_old_scores] completed in 0 seconds
INFO 2026-10-28 14:34:46.999398 UTC Pipeline completed in 36 seconds