Initial import of LogDarioSeq baseline

Establishes version control for the personal Logseq DB fork before
starting the server-client architecture migration and domain features
described in docs/agent-guide and the approved implementation plan.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

deps/db-sync/test/logseq/db_sync/worker_test.cljs

@@ -0,0 +1,30 @@
+(ns logseq.db-sync.worker-test
+  (:require [cljs.test :refer [deftest is]]
+            [datascript.core :as d]
+            [logseq.db-sync.order :as sync-order]
+            [logseq.db.common.order :as db-order]
+            [logseq.db.frontend.schema :as db-schema]))
+
+(defn- new-conn []
+  (d/create-conn db-schema/schema))
+
+(deftest duplicate-order-fix-test
+  (let [conn (new-conn)
+        parent (random-uuid)
+        block-a (random-uuid)
+        block-b (random-uuid)
+        order-a (db-order/gen-key nil nil)
+        order-b (db-order/gen-key order-a nil)]
+    (d/transact! conn [{:block/uuid parent}
+                       {:block/uuid block-a
+                        :block/parent [:block/uuid parent]
+                        :block/order order-a}
+                       {:block/uuid block-b
+                        :block/parent [:block/uuid parent]
+                        :block/order order-b}])
+    (let [tx [[:db/add [:block/uuid block-b] :block/order order-a]]
+          _ (sync-order/fix-duplicate-orders! conn tx {})
+          order-a' (:block/order (d/entity @conn [:block/uuid block-a]))
+          order-b' (:block/order (d/entity @conn [:block/uuid block-b]))]
+      (is (= order-a order-a'))
+      (is (not= order-a' order-b')))))