Add SCUM trade catalog projections

platform/service/plugin_query_projection.go

@@ -3,11 +3,13 @@ package service
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"strings"
 	"time"
 
 	"browser.local/platform/domain"
+	"browser.local/platform/repo"
 )
 
 func (svc *CoreService) scheduleDuePluginQueryProjectionJobs(claim domain.RunJobClaim, stamp time.Time) error {
@@ -147,6 +149,13 @@ func (svc *CoreService) projectPluginQueryJobResult(job domain.Job, stamp time.T
 			if keyErr != nil {
 				return keyErr
 			}
+			if projection.MergeExisting {
+				if existing, existingErr := svc.store.PluginDataRecords().Get(pluginDataID(instance.ID, plugin.ID, projection.Collection, key)); existingErr == nil {
+					value = mergePluginDataValues(existing.Value, value)
+				} else if !errors.Is(existingErr, repo.ErrNotFound) {
+					return existingErr
+				}
+			}
 			collectionMutations[key] = domain.PluginDataMutation{Operation: domain.PluginDataMutationPut, Key: key, Value: value}
 		}
 	}