fix(server): retain latest check intervals and tags across multi-stage appends (#696)

[shobhitagnihotri69]

Closes #696

Problem

In hflow-server/_catalog.py, query_latest_run_intervals and query_episode_dossier (for tags) joined intervals and tags against episodes_latest using run_fingerprint. When an episode receives multi-stage appends (e.g. Stage.META followed by Stage.LABELS or Stage.MEDIA) or incremental step runs, each append writes under a new run_fingerprint. Because episodes_latest points to the newest append's run_fingerprint, joining on i.run_fingerprint = e.run_fingerprint dropped all intervals and tags recorded by checks in earlier stages.

Solution

• Updated query_latest_run_intervals and query_episode_dossier to join check_runs_latest AS r USING (episode_id, run_fingerprint, check_name).
• Scopes intervals and tags to each check's latest run, matching the invariant of snapshot.py and measurements_latest (fix(curation): draw measurements_latest from each check's latest run #694).
• Added regression test test_dossier_intervals_and_tags_survive_subsequent_stage_append in packages/hflow-server/tests/test_server_episode_dossier.py validating that intervals and tags persist across subsequent stage appends and are cleanly withdrawn if the check re-runs without them.

[greptile-apps]

Confidence Score: 5/5

[Medium risk] Changes how episode intervals and tags are queried from the database.

The PR appears safe to merge.

What we checked:

• Tag times changing unexpectedly: The writer gives each tag and its episode the same time. The view reads that episode time for the selected check run.

Summary

Episode dossiers and timelines now show intervals and tags from each check’s latest run, even after another stage appends. When a check runs again without evidence, its older intervals and tags disappear.

• Episode pages keep each check’s latest intervals and tags across appends.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[Episode appends] --> B[Latest run for each check]
  B --> C[Intervals and tags]
  C --> D[Dossier and timeline]

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_{Reviews (1) · Last reviewed commit: "fix(server): retain each check's latest ..."}

[kstonekuan]

LGTM, merging.