[Dashboard] Prune incompatible-schema run directories

[IEvangelist]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

DashboardRunStore.LoadRuns excludes metadata whose schema version differs from the current version. PruneRuns only iterates the successfully loaded _runs snapshot.

After a Dashboard schema upgrade, older-schema run directories become invisible to both selection and retention, so storage can grow beyond the advertised run limit.

Expected Behavior

Incompatible historical runs should remain non-selectable but still participate in retention cleanup.

Steps To Reproduce

1. Create Run history with one Dashboard schema version.
2. Start a Dashboard whose schema version has advanced.
3. Create enough new runs to trigger retention.
4. The old-schema directories are never selected as pruning candidates.

Exceptions (if any)

N/A

Aspire doctor output

Aspire CLI 13.6.0-pr.18924.g5ee63941
Windows 10.0.26200 and Ubuntu 24.04.3

Anything else?

Related to #18924. Source: src/Aspire.Dashboard/ServiceClient/DashboardRunStore.cs:336-369,440-465. This was mentioned during PR review and remains on current main.

[joperezr]

🤖 Aspire triage pass — 2026-08-28 19:30 UTC

Area: area-dashboard
Kind: bug
Repro: yes-minimal — see the Steps To Reproduce section
Affected version(s): 13.6.0-pr.18924 (pre-release; feature unshipped — latest shipped line: 13.5.x)
Severity: S3 — incompatible-schema run dirs skip retention; storage can exceed the advertised limit after a schema bump

Urgency: ⚪ backlog — no milestone
Reason: follow-up bug on the unshipped persistence feature (PR #18924); not a regression. Backlog while 13.6 stabilizes (open milestones: Backlog / 13.5.x / 13.6 / 14.0).

Suggested owner(s): James Newton-King (@JamesNK) (primary), backup Adam Ratzman (@adamint)
Evidence:

• James Newton-King (@JamesNK) is the top recent contributor in area-dashboard — merged Add SQLite persistence and run history to the Dashboard #18924 (the persistence/resume feature these follow-ups derive from), plus Harden Markdown URL validation #19698, Use SQLite for dashboard telemetry filtering #19661, Fix dashboard resource subscription race #19534 and ~37 more in the last 90d
• James Newton-King (@JamesNK) closed [15.5] Filtering metrics by dimensions doesn't work as expected #19046, File input: Localize validation messages in InteractionsInputDialog #18660, Streaming Http Telemetry API doesn't work if you start streaming before telemetry arrives. #17802 (and 14 more) as completed in area-dashboard (last 180d)
• backup Adam Ratzman (@adamint): 10 recent area-dashboard merges (Revert "Update parent resource state from replicas (#18642)" #19545, Fix Dashboard HTML language under invariant culture #19331, Fix dashboard accessibility regressions #19027 …) and 10 closed-completed issues
• CODEOWNERS has no path-specific entry for these files

Confidence: high
Needs human?: no

[JamesNK]

I think incompatible versions should be loaded in the list but be disable for selection. That avoids unexpectedly deleting old info.

[JamesNK]

Done