Avoid loading full container snapshot table in dashboard queries#198
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GetLatestContainerSnapshotsAsync materialized the entire ContainerSnapshots table with all navigation includes before selecting the latest state in memory, which exhausted memory as snapshot history grew and produced OutOfMemoryException on the dashboard and runtime container pages. The selection now runs in the database: the latest runtime scan run per instance is resolved from a lightweight distinct projection, and instances without a runtime scan fall back to a per-container greatest-record subquery. Only the small final result set is materialized. Add a regression test covering the historical-snapshot fallback collapse.
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GetLatestContainerSnapshotsAsync materialized the entire ContainerSnapshots table with all navigation includes before selecting the latest state in memory, which exhausted memory as snapshot history grew and produced OutOfMemoryException on the dashboard and runtime container pages. The selection now runs in the database: the latest runtime scan run per instance is resolved from a lightweight distinct projection, and instances without a runtime scan fall back to a per-container greatest-record subquery. Only the small final result set is materialized. Add a regression test covering the historical-snapshot fallback collapse.