Remove legacy plugin query projections

platform/service/plugin_lifecycle_projection.go

@@ -64,7 +64,7 @@ func (svc *CoreService) applyPluginBulkProjection(instance domain.ServerInstance
 func pluginBulkProjectionValues(fixedValues map[string]string, stamp time.Time, row map[string]any, observedAtField string) map[string]any {
 	value := make(map[string]any, len(fixedValues)+1)
 	for key, fixed := range fixedValues {
-		value[key] = renderQueryProjectionTemplate(fixed, row)
+		value[key] = renderPluginValueTemplate(fixed, row)
 	}
 	if observedAtField != "" {
 		value[observedAtField] = stamp.UTC().Format(time.RFC3339Nano)
@@ -78,10 +78,18 @@ func pluginBulkActivityValue(target domain.GameClientBridgeBulkActivityTargetDec
 		value[destination] = row[source]
 	}
 	for key, fixed := range target.FixedValues {
-		value[key] = renderQueryProjectionTemplate(fixed, row)
+		value[key] = renderPluginValueTemplate(fixed, row)
 	}
 	if target.ObservedAtField != "" {
 		value[target.ObservedAtField] = stamp.UTC().Format(time.RFC3339Nano)
 	}
 	return value
 }
+
+func renderPluginValueTemplate(template string, row map[string]any) string {
+	result := template
+	for key, value := range row {
+		result = strings.ReplaceAll(result, "{{"+key+"}}", fmt.Sprint(value))
+	}
+	return result
+}