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Harden scheduling failover and state recording - #74
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Slow or partial leader reconciliation could outlive its lease, stale durable schedules could survive failover, and several state mutations could overwrite concurrent updates. This change keeps lease renewal independent from bounded scheduler reconciliation, tracks partial work until cleanup succeeds, reconciles current persisted checker state in bulk, and makes history and uptime updates concurrency-safe.
It also validates scheduler-specific limits before replacing working schedules, preserves Healthie's leading-seconds cron meaning in Temporal, rejects Cronos extensions whose Temporal semantics differ, and uses Cosmos DB
ReadManyItemsAsyncfor multi-state reads.Validation:
dotnet restore Healthie.NET.sln --locked-modedotnet build Healthie.NET.sln --configuration Release --no-restore— 0 warnings, 0 errorsdotnet test tests/Healthie.Tests.Unit/Healthie.Tests.Unit.csproj --configuration Release --no-restore— 617 passed onnet8.0; 617 passed onnet10.0dotnet list Healthie.NET.sln package --vulnerable --include-transitive— no vulnerable packagesNo live Cosmos DB, Temporal, Hangfire, or Coravel backend was required for these unit-level paths; their request construction, parser behavior, concurrency boundaries, and failure handling are covered with deterministic tests and fakes.