Reduce scheduler polling noise

server/migrations_ops/20260520151000_add_scheduler_run_retention_job.down.sql

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+DELETE FROM ops.scheduler_job_triggers
+WHERE job_key = 'scheduler_run_retention';
+
+DELETE FROM ops.scheduler_job_runs
+WHERE job_key = 'scheduler_run_retention';
+
+DELETE FROM ops.scheduler_jobs
+WHERE job_key = 'scheduler_run_retention';
+
+DROP INDEX IF EXISTS ops.idx_scheduler_job_triggers_finished_requested;
+DROP INDEX IF EXISTS ops.idx_scheduler_job_triggers_run_id;

server/migrations_ops/20260520151000_add_scheduler_run_retention_job.up.sql

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+CREATE INDEX IF NOT EXISTS idx_scheduler_job_triggers_run_id
+    ON ops.scheduler_job_triggers (run_id)
+    WHERE run_id IS NOT NULL;
+
+CREATE INDEX IF NOT EXISTS idx_scheduler_job_triggers_finished_requested
+    ON ops.scheduler_job_triggers (requested_at ASC, id ASC)
+    WHERE status IN ('success', 'failed', 'skipped');
+
+INSERT INTO ops.scheduler_jobs
+    (job_key, display_name, category, description, enabled, schedule_type, interval_seconds, timezone, timeout_seconds, batch_size, config)
+VALUES
+    ('scheduler_run_retention', '调度运行记录留存清理', 'ops', '限批删除 15 天以前已结束的调度触发与运行记录，控制高频 scheduler 审计表体积。', true, 'interval', 86400, 'Asia/Shanghai', 300, 5000,
+     '{"retention_days":15,"batch_size":5000,"max_batches_per_run":100,"dry_run":false,"statement_timeout":"5s","run_at_local":"03:20"}'::jsonb)
+ON CONFLICT (job_key) DO UPDATE
+SET display_name = EXCLUDED.display_name,
+    category = EXCLUDED.category,
+    description = EXCLUDED.description,
+    config = ops.scheduler_jobs.config || EXCLUDED.config,
+    updated_at = NOW();

server/migrations_ops/20260521100000_tune_scheduler_polling_noise.down.sql

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+UPDATE ops.scheduler_jobs
+SET interval_seconds = 60,
+    config = config - 'claim_ttl' - 'suppress_empty_success_runs' - 'empty_success_metric_keys',
+    updated_at = NOW()
+WHERE job_key = 'monitoring_result_recovery';
+
+UPDATE ops.scheduler_jobs
+SET config = config - 'suppress_empty_success_runs' - 'empty_success_metric_keys',
+    updated_at = NOW()
+WHERE job_key = 'schedule_dispatch';

server/migrations_ops/20260521100000_tune_scheduler_polling_noise.up.sql

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+UPDATE ops.scheduler_jobs
+SET interval_seconds = 120,
+    config = config || '{"claim_ttl":"5m"}'::jsonb,
+    updated_at = NOW()
+WHERE job_key = 'monitoring_result_recovery';
+
+UPDATE ops.scheduler_jobs
+SET config = config || '{"suppress_empty_success_runs":true,"empty_success_metric_keys":["hydrated_count","claimed_count"]}'::jsonb,
+    updated_at = NOW()
+WHERE job_key = 'schedule_dispatch';
+
+UPDATE ops.scheduler_jobs
+SET config = config || '{"suppress_empty_success_runs":true,"empty_success_metric_keys":["recoverable_count","republished_count"]}'::jsonb,
+    updated_at = NOW()
+WHERE job_key = 'monitoring_result_recovery';