[GSoC] History of Advisories

[Samk1710]

Resolves

• History of Advisories #2329

Tasks

• Implement Advisory Snapshot to view an advisory at a certain point in time
• Implement Snapshot of Package Details to view details of the advisory at a point in time
• Implement Diff to Summarize History
• Add HistoryDiff model to store pre-computed diffs
• Update to collect diffs at import time
• Add Improver to backfill History diffs
• Add tests

Improver Logs:

python manage.py improve history_diff_improver_v2
Improving data using history_diff_improver_v2
INFO 2026-07-25 17:36:36.787350 UTC Pipeline [HistoryDiffImproverPipeline] starting
INFO 2026-07-25 17:36:36.787435 UTC Step [calculate_history_diffs] starting
INFO 2026-07-25 17:36:36.819868 UTC Computing history diffs for 7 advisories
INFO 2026-07-25 17:36:36.945200 UTC Successfully finished history diff backfill.
INFO 2026-07-25 17:36:36.945315 UTC Step [calculate_history_diffs] completed in 0 seconds
INFO 2026-07-25 17:36:36.945345 UTC Pipeline completed in 0 seconds

[Samk1710]

Attached some screenshots for the feature

History tab for https://github.com/github/advisory-database/commits/main/advisories/github-reviewed/2026/02/GHSA-72hv-8253-57qq/GHSA-72hv-8253-57qq.json

Summary of changes on History Tab

Severity Tab: Latest vs Oldest

Severity Change from High 8.7 --> Moderate 6.9

Package Details Changes

[Samk1710]

This PR is ready for review. Do take a look!
CC: @keshav-space @ziadhany @TG1999 @Hritik14

[keshav-space]

@Samk1710 there is a lot of unrelated formatting changes, it makes the review hard. Formatting changes to existing code should belong in a separate PR.

[Samk1710]

@keshav-space yes I understand. It got auto-formatted :<
Let me check if I can undo the formatting else I'll raise a separate PR.