[StuartFerguson]

Summary

• Split service-detail observation/check loading to avoid the wide EF join and excessive SQL Server memory grant.
• Limit materialized detail observations and checks to the latest 100.
• Keep 24-hour uptime and observation totals accurate with a separate aggregate query.
• Distinguish loading, not-found, and query-error states in the detail page.
• Log detail-query failures server-side.
• Add tests for load states and observation metrics.

Root cause

The staging query plan showed a RESOURCE_SEMAPHORE wait of approximately 93 seconds, a 427 MB desired memory grant, only 1 MB granted, and tempdb sort spills while loading roughly 1,400 observations and checks through one wide Include query.

Verification

• Health Monitoring tests: 72 passed
• Release build: 0 warnings, 0 errors

Closes #780

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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