Initial commit

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

models/v/mediamod/update_marker.go

@@ -0,0 +1,48 @@
+package mediamod
+
+import (
+	"time"
+
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/primitive"
+)
+
+type moduleLatestContentAt struct {
+	ModuleID             primitive.ObjectID `bson:"_id"`
+	LatestCreatedAt      time.Time          `bson:"latestCreatedAt"`
+	LatestContentUpdated time.Time          `bson:"latestContentUpdated"`
+}
+
+// LatestContentAtByModules 返回动漫、漫画等媒体亚模块最近一次新增或子集更新时间。
+func LatestContentAtByModules(moduleIDs []primitive.ObjectID) (map[string]time.Time, error) {
+	result := make(map[string]time.Time, len(moduleIDs))
+	if len(moduleIDs) == 0 {
+		return result, nil
+	}
+	pipeline := []bson.M{
+		{"$match": bson.M{
+			"status":   1,
+			"isDelete": false,
+			"mId":      bson.M{"$in": moduleIDs},
+		}},
+		{"$group": bson.M{
+			"_id":                  "$mId",
+			"latestCreatedAt":      bson.M{"$max": "$createdAt"},
+			"latestContentUpdated": bson.M{"$max": "$contentUpdateTime"},
+		}},
+	}
+	var rows []moduleLatestContentAt
+	if err := coll(nil).Aggregate(&rows, pipeline); err != nil {
+		return nil, err
+	}
+	for _, row := range rows {
+		latest := row.LatestCreatedAt
+		if row.LatestContentUpdated.After(latest) {
+			latest = row.LatestContentUpdated
+		}
+		if !row.ModuleID.IsZero() && !latest.IsZero() {
+			result[row.ModuleID.Hex()] = latest
+		}
+	}
+	return result, nil
+}