feat: rebuild CSP practice workflow, UX and automation

backend/tests/import_service_test.cc

@@ -0,0 +1,34 @@
+#include <catch2/catch_test_macros.hpp>
+
+#include "csp/db/sqlite_db.h"
+#include "csp/services/import_service.h"
+
+TEST_CASE("import service query latest job and items") {
+  auto db = csp::db::SqliteDb::OpenMemory();
+  csp::db::ApplyMigrations(db);
+
+  db.Exec(
+      "INSERT INTO import_jobs(status,trigger,total_count,processed_count,success_count,"
+      "failed_count,options_json,last_error,started_at,finished_at,updated_at,created_at)"
+      "VALUES('running','manual',10,3,2,1,'{}','',100,null,120,90);");
+  db.Exec(
+      "INSERT INTO import_job_items(job_id,source_path,status,title,difficulty,problem_id,"
+      "error_text,started_at,finished_at,updated_at,created_at)"
+      "VALUES(1,'CSP-J/2024/Round1/A.pdf','success','A',2,11,'',101,102,120,100);");
+
+  csp::services::ImportService svc(db);
+  const auto latest = svc.GetLatestJob();
+  REQUIRE(latest.has_value());
+  REQUIRE(latest->id == 1);
+  REQUIRE(latest->status == "running");
+  REQUIRE(latest->processed_count == 3);
+
+  csp::services::ImportJobItemQuery q;
+  q.page = 1;
+  q.page_size = 20;
+  const auto items = svc.ListItems(1, q);
+  REQUIRE(items.size() == 1);
+  REQUIRE(items[0].source_path == "CSP-J/2024/Round1/A.pdf");
+  REQUIRE(items[0].status == "success");
+  REQUIRE(items[0].problem_id.has_value());
+}