diff --git a/server/migrations/20260526110000_add_publish_task_dedup_index.down.sql b/server/migrations/20260526110000_add_publish_task_dedup_index.down.sql
new file mode 100644
index 0000000..8cd5021
--- /dev/null
+++ b/server/migrations/20260526110000_add_publish_task_dedup_index.down.sql
@@ -0,0 +1 @@
+DROP INDEX CONCURRENTLY IF EXISTS uq_desktop_tasks_publish_dedup_active;
diff --git a/server/migrations/20260526110000_add_publish_task_dedup_index.up.sql b/server/migrations/20260526110000_add_publish_task_dedup_index.up.sql
new file mode 100644
index 0000000..7a936d0
--- /dev/null
+++ b/server/migrations/20260526110000_add_publish_task_dedup_index.up.sql
@@ -0,0 +1,8 @@
+-- Keep succeeded publish tasks in the active dedup set intentionally: the
+-- product rule is "one article can be published to an account once"; repeat
+-- publishing should use a copied/new article or an explicit admin status reset.
+CREATE UNIQUE INDEX CONCURRENTLY IF NOT EXISTS uq_desktop_tasks_publish_dedup_active
+    ON desktop_tasks (dedup_key)
+    WHERE kind = 'publish'
+      AND dedup_key IS NOT NULL
+      AND status IN ('queued', 'in_progress', 'succeeded', 'unknown');
diff --git a/server/migrations/20260526110001_add_publish_records_active_lookup_index.down.sql b/server/migrations/20260526110001_add_publish_records_active_lookup_index.down.sql
new file mode 100644
index 0000000..28ab4f9
--- /dev/null
+++ b/server/migrations/20260526110001_add_publish_records_active_lookup_index.down.sql
@@ -0,0 +1 @@
+DROP INDEX CONCURRENTLY IF EXISTS idx_publish_records_article_account_active;
diff --git a/server/migrations/20260526110001_add_publish_records_active_lookup_index.up.sql b/server/migrations/20260526110001_add_publish_records_active_lookup_index.up.sql
new file mode 100644
index 0000000..d83c19f
--- /dev/null
+++ b/server/migrations/20260526110001_add_publish_records_active_lookup_index.up.sql
@@ -0,0 +1,3 @@
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_publish_records_article_account_active
+    ON publish_records (tenant_id, article_id, platform_account_id, updated_at DESC, id DESC)
+    WHERE status IN ('queued', 'publishing', 'success');
diff --git a/server/migrations/20260526110002_add_desktop_tasks_publish_record_payload_index.down.sql b/server/migrations/20260526110002_add_desktop_tasks_publish_record_payload_index.down.sql
new file mode 100644
index 0000000..c829294
--- /dev/null
+++ b/server/migrations/20260526110002_add_desktop_tasks_publish_record_payload_index.down.sql
@@ -0,0 +1 @@
+DROP INDEX CONCURRENTLY IF EXISTS idx_desktop_tasks_publish_record_payload;
diff --git a/server/migrations/20260526110002_add_desktop_tasks_publish_record_payload_index.up.sql b/server/migrations/20260526110002_add_desktop_tasks_publish_record_payload_index.up.sql
new file mode 100644
index 0000000..0267832
--- /dev/null
+++ b/server/migrations/20260526110002_add_desktop_tasks_publish_record_payload_index.up.sql
@@ -0,0 +1,15 @@
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_desktop_tasks_publish_record_payload
+    ON desktop_tasks (
+        tenant_id,
+        workspace_id,
+        (
+        -- Keep this expression aligned with loadExistingPublishRecordTargets.
+        CASE
+            WHEN (payload->>'publish_record_id') ~ '^[0-9]+$'
+                THEN (payload->>'publish_record_id')::bigint
+            ELSE NULL
+        END
+        )
+    )
+    WHERE kind = 'publish'
+      AND payload ? 'publish_record_id';