fix: throttle desktop monitoring dispatch

server/migrations_monitoring/20260622093000_add_collect_task_question_text_snapshot.down.sql

@@ -0,0 +1,2 @@
+ALTER TABLE monitoring_collect_tasks
+    DROP COLUMN IF EXISTS question_text_snapshot;

server/migrations_monitoring/20260622093000_add_collect_task_question_text_snapshot.up.sql

@@ -0,0 +1,28 @@
+ALTER TABLE monitoring_collect_tasks
+    ADD COLUMN IF NOT EXISTS question_text_snapshot TEXT NOT NULL DEFAULT '';
+
+UPDATE monitoring_collect_tasks t
+SET question_text_snapshot = s.question_text_snapshot
+FROM (
+    SELECT DISTINCT ON (tenant_id, brand_id, question_id, question_hash)
+        tenant_id,
+        brand_id,
+        question_id,
+        question_hash,
+        question_text_snapshot
+    FROM monitoring_question_config_snapshots
+    WHERE btrim(question_text_snapshot) <> ''
+    ORDER BY
+        tenant_id,
+        brand_id,
+        question_id,
+        question_hash,
+        CASE WHEN deleted_at IS NULL THEN 0 ELSE 1 END,
+        projected_at DESC,
+        id DESC
+) s
+WHERE t.tenant_id = s.tenant_id
+  AND t.brand_id = s.brand_id
+  AND t.question_id = s.question_id
+  AND t.question_hash = s.question_hash
+  AND btrim(t.question_text_snapshot) = '';