[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:

pythonmanage.pyimprovehistory_diff_improver_v2Improvingdatausinghistory_diff_improver_v2INFO2026-07-2517:36:36.787350UTCPipeline [HistoryDiffImproverPipeline] startingINFO2026-07-2517:36:36.787435UTCStep [calculate_history_diffs] startingINFO2026-07-2517:36:36.819868UTCComputinghistorydiffsfor7advisoriesINFO2026-07-2517:36:36.945200UTCSuccessfullyfinishedhistorydiffbackfill.
INFO2026-07-2517:36:36.945315UTCStep [calculate_history_diffs] completedin0secondsINFO2026-07-2517:36:36.945345UTCPipelinecompletedin0seconds

[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