feat: rebuild CSP practice workflow, UX and automation

backend/include/csp/services/wrong_book_service.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "csp/db/sqlite_db.h"
+#include "csp/domain/entities.h"
+
+#include <cstdint>
+#include <string>
+#include <vector>
+
+namespace csp::services {
+
+struct WrongBookEntry {
+  domain::WrongBookItem item;
+  std::string problem_title;
+};
+
+class WrongBookService {
+ public:
+  explicit WrongBookService(db::SqliteDb& db) : db_(db) {}
+
+  std::vector<WrongBookEntry> ListByUser(int64_t user_id);
+  void UpsertNote(int64_t user_id, int64_t problem_id, const std::string& note);
+  void UpsertBySubmission(int64_t user_id,
+                          int64_t problem_id,
+                          int64_t submission_id,
+                          const std::string& note);
+  void Remove(int64_t user_id, int64_t problem_id);
+
+ private:
+  db::SqliteDb& db_;
+};
+
+}  // namespace csp::services