feat: add feedback existence check and update API spec for feedback submission

controllers/ReportController.cc

@@ -57,7 +57,8 @@ void sendService(Json::Value body,
     else if (error == "invalid_status_transition" ||
              error == "media_limit_reached" ||
              error == "report_not_open" ||
-             error == "report_owned_by_other_operator")
+             error == "report_owned_by_other_operator" ||
+             error == "feedback_already_exists")
     {
         status = drogon::k409Conflict;
     }

docs/API_SPEC.md

@@ -74,7 +74,7 @@ Authorization: Bearer <token>
 - `POST /reports/{id}/media`
   max 5 total media, image/video only
 - `POST /reports/{id}/feedback`
-  only owner, only when status is `RESOLVED`
+  only owner, only when status is `RESOLVED`, one feedback per report
 
 ## Operator Workflow
 - `GET /operator/teams`

services/ReportService.cc

@@ -7,6 +7,7 @@
 #include "services/UserService.h"
 
 #include <drogon/drogon.h>
+#include <drogon/orm/Exception.h>
 
 #include <map>
 #include <set>
@@ -1057,6 +1058,16 @@ Json::Value ReportService::addFeedback(const auth::UserContext &user,
         return failure("report_not_resolved");
     }
 
+    const auto existingFeedback = db->execSqlSync(
+        "SELECT id FROM feedback WHERE report_id = ?",
+        reportId);
+    if (!existingFeedback.empty())
+    {
+        return failure("feedback_already_exists");
+    }
+
+    try
+    {
         db->execSqlSync(
             "INSERT INTO feedback (report_id, user_id, rating, comment) "
             "VALUES (?, ?, ?, ?)",
@@ -1064,6 +1075,11 @@ Json::Value ReportService::addFeedback(const auth::UserContext &user,
             user.id,
             rating,
             body.get("comment", "").asString());
+    }
+    catch (const drogon::orm::DrogonDbException &)
+    {
+        return failure("feedback_already_exists");
+    }
     return success();
 }