diff --git a/packages/dbtype/src/api.ts b/packages/dbtype/src/api.ts
index 120f01f..1634c7e 100644
--- a/packages/dbtype/src/api.ts
+++ b/packages/dbtype/src/api.ts
@@ -11,6 +11,7 @@ export const DocumentBodySchema = z.object({
 	additional: z.record(z.unknown()),
 	tags: z.array(z.string()),
 	pagenum: z.number().int(),
+	gid: z.number().nullable(),
 });
 
 export type DocumentBody = z.infer<typeof DocumentBodySchema>;
diff --git a/packages/dbtype/src/types.ts b/packages/dbtype/src/types.ts
index 63152e7..cbdb075 100644
--- a/packages/dbtype/src/types.ts
+++ b/packages/dbtype/src/types.ts
@@ -21,6 +21,7 @@ export interface Document {
   modified_at: number;
   title: string;
   pagenum: number;
+  gid: number | null;
 }
 
 export interface Permissions {
diff --git a/packages/server/migrations/initial.ts b/packages/server/migrations/initial.ts
index c54a41e..36f097e 100644
--- a/packages/server/migrations/initial.ts
+++ b/packages/server/migrations/initial.ts
@@ -23,7 +23,7 @@ export async function up(db: Kysely<any>) {
         .addColumn('filename', 'varchar(512)', col => col.notNull())
         .addColumn('content_hash', 'varchar')
         .addColumn('additional', 'json')
-		.addColumn("pagenum", "integer", col => col.notNull())
+        .addColumn("pagenum", "integer", col => col.notNull())
         .addColumn('created_at', 'integer', col => col.notNull())
         .addColumn('modified_at', 'integer', col => col.notNull())
         .addColumn('deleted_at', 'integer')
@@ -62,13 +62,27 @@ export async function up(db: Kysely<any>) {
         })
         .execute();
 
-	await db
-		.insertInto('schema_migration')
-		.values({
-			version: '0.0.1',
-			dirty: false,
-		})
-		.execute();
+    await db
+        .insertInto('schema_migration')
+        .values({
+            version: '0.0.1',
+            dirty: false,
+        })
+        .execute();
+
+    // create indexes
+    await db.schema.createIndex("index_document_basepath_filename")
+        .on("document")
+        .columns(["basepath", "filename"])
+        .execute();
+    await db.schema.createIndex("index_document_content_hash")
+        .on("document")
+        .columns(["content_hash"])
+        .execute();
+    await db.schema.createIndex("index_document_created_at")
+        .on("document")
+        .columns(["created_at"])
+        .execute();
 }
 
 export async function down(db: Kysely<any>) {
diff --git a/packages/server/src/content/file.ts b/packages/server/src/content/file.ts
index c26d5f9..caf9f15 100644
--- a/packages/server/src/content/file.ts
+++ b/packages/server/src/content/file.ts
@@ -3,6 +3,7 @@ import { promises, type Stats } from "node:fs";
 import path, { extname } from "node:path";
 import type { DocumentBody } from "dbtype";
 import { oshash, OshashError } from "src/util/oshash.ts";
+import { extractGidFromFilename } from "src/util/gid.ts";
 /**
  * content file or directory referrer
  */
@@ -53,6 +54,7 @@ export const createDefaultClass = (type: string): ContentFileConstructor => {
 				content_hash: await this.getHash(),
 				modified_at: await this.getMtime(),
 				pagenum: 0,
+				gid: extractGidFromFilename(base),
 			} as DocumentBody;
 			return ret;
 		}
diff --git a/packages/server/src/db/doc.ts b/packages/server/src/db/doc.ts
index cd4238e..301a6d1 100644
--- a/packages/server/src/db/doc.ts
+++ b/packages/server/src/db/doc.ts
@@ -88,7 +88,7 @@ class SqliteDocumentAccessor implements DocumentAccessor {
 				.executeTakeFirst() as { id: number };
 			const id = id_lst.id;
 
-		  if (tags.length > 0){	
+			if (tags.length > 0) {
 				// add tags
 				await trx.insertInto("tags")
 					.values(tags.map((x) => ({ name: x })))
@@ -202,6 +202,19 @@ class SqliteDocumentAccessor implements DocumentAccessor {
 			tags: JSON.parse(x.tags ?? "[]"), //?.map((x: { tag_name: string }) => x.tag_name) ?? [],
 		}));
 	}
+	async findByGidList(gid_list: number[]) {
+		const result = await this.kysely
+			.selectFrom("document")
+			.selectAll()
+			.where("gid", "in", gid_list)
+			.execute();
+		return result.map((x) => ({
+			...x,
+			content_hash: x.content_hash ?? "",
+			tags: [],
+			additional: {},
+		}));
+	}
 	async findByPath(path: string, filename?: string): Promise<Document[]> {
 		const results = await this.kysely
 			.selectFrom("document")
@@ -216,6 +229,7 @@ class SqliteDocumentAccessor implements DocumentAccessor {
 			additional: {},
 		}));
 	}
+
 	async update(c: Partial<Document> & { id: number }) {
 		const { id, tags, additional, ...rest } = c;
 		const r = await this.kysely.updateTable("document")
@@ -322,7 +336,7 @@ class SqliteDocumentAccessor implements DocumentAccessor {
 				.values(tags.map((x) => ({ tag_name: x, doc_id: c.id }))
 				)
 				.execute();
-			
+
 		});
 	}
 }
diff --git a/packages/server/src/db/kysely.ts b/packages/server/src/db/kysely.ts
index 75ca907..0c0c4c0 100644
--- a/packages/server/src/db/kysely.ts
+++ b/packages/server/src/db/kysely.ts
@@ -25,11 +25,11 @@ export function getKysely() {
             log: (event) => {
                 if (event.level === "error") {
                     console.error("Query failed : ", {
-          durationMs: event.queryDurationMillis,
-          error: event.error,
-          sql: event.query.sql,
-          params: event.query.parameters,
-        });
+                        durationMs: event.queryDurationMillis,
+                        error: event.error,
+                        sql: event.query.sql,
+                        params: event.query.parameters,
+                    });
                 }
             }
         });
diff --git a/packages/server/src/diff/content_handler.ts b/packages/server/src/diff/content_handler.ts
index b4b7865..61dd451 100644
--- a/packages/server/src/diff/content_handler.ts
+++ b/packages/server/src/diff/content_handler.ts
@@ -52,7 +52,7 @@ export class ContentDiffHandler {
 			console.log("its not in waiting_list and db!!!: ", cpath);
 			return;
 		}
-	  console.log("deleted ",cpath, dbc[0].content_hash)	
+	  	console.log("deleted ",cpath, dbc[0].content_hash)	
 		const content_hash = dbc[0].content_hash;
 		// When a path is changed, it takes into account when the
 		// creation event occurs first and the deletion occurs, not
@@ -62,14 +62,12 @@ export class ContentDiffHandler {
 		if (cf) {
 			// if a path is changed, update the changed path.
 			console.log("update path from", cpath, "to", cf.path);
-			const newFilename = basename(cf.path);
-			const newBasepath = dirname(cf.path);
+			const new_doc = createContentFile(this.content_type, cf.path);
 			this.waiting_list.deleteByHash(content_hash);
+
 			await this.doc_cntr.update({
-				id: dbc[0].id,
-				deleted_at: null,
-				filename: newFilename,
-				basepath: newBasepath,
+				...dbc[0],
+				...new_doc.createDocumentBody(),
 			});
 			return;
 		}
@@ -91,21 +89,17 @@ export class ContentDiffHandler {
 		if (c !== undefined) {
 			await this.doc_cntr.update({
 				id: c.id,
-				deleted_at: null,
-				filename: filename,
-				basepath: basepath,
+				...content.createDocumentBody(),
 			});
 		}
 		if (this.waiting_list.hasByHash(hash)) {
-			console.log("Hash Conflict!!!");
+			console.log("Hash Conflict!!!", cpath);
 		}
 		this.waiting_list.set(content);
 	}
 	private async OnChanged(prev_path: string, cur_path: string) {
 		const prev_basepath = dirname(prev_path);
 		const prev_filename = basename(prev_path);
-		const cur_basepath = dirname(cur_path);
-		const cur_filename = basename(cur_path);
 		console.log("modify", cur_path, "from", prev_path);
 		const c = this.waiting_list.getByPath(prev_path);
 		if (c !== undefined) {
@@ -123,8 +117,7 @@ export class ContentDiffHandler {
 
 		await this.doc_cntr.update({
 			...doc[0],
-			basepath: cur_basepath,
-			filename: cur_filename,
+			...createContentFile(this.content_type, cur_path).createDocumentBody(),
 		});
 	}
 	async onModified(path: string) {
@@ -146,7 +139,7 @@ export class ContentDiffHandler {
 		// if it is in db, update it.
 		await this.doc_cntr.update({
 			...doc[0],
-			content_hash: await content.getHash(),
+			...content.createDocumentBody(),
 			modified_at: Date.now(),
 		});
 	}
diff --git a/packages/server/src/diff/watcher/ComicConfig.ts b/packages/server/src/diff/watcher/ComicConfig.ts
index 23dd6ab..da42a85 100644
--- a/packages/server/src/diff/watcher/ComicConfig.ts
+++ b/packages/server/src/diff/watcher/ComicConfig.ts
@@ -1,5 +1,5 @@
 import { ConfigManager } from "../../util/configRW.ts";
-import ComicSchema from "./ComicConfig.schema.json";
+import ComicSchema from "./ComicConfig.schema.json" assert { type: "json" };
 export interface ComicConfig {
 	watch: string[];
 }
diff --git a/packages/server/src/model/doc.ts b/packages/server/src/model/doc.ts
index 0758041..0e193bf 100644
--- a/packages/server/src/model/doc.ts
+++ b/packages/server/src/model/doc.ts
@@ -55,6 +55,12 @@ export interface DocumentAccessor {
 	 * if you call this function with filename, its return array length is 0 or 1.
 	 */
 	findByPath: (basepath: string, filename?: string) => Promise<Document[]>;
+	/**
+	 * find by gid list
+	 * @param gid_list 
+	 * @returns Document list
+	 */
+	findByGidList: (gid_list: number[]) => Promise<Document[]>;
 	/**
 	 * find deleted content
 	 */
diff --git a/packages/server/src/route/contents.ts b/packages/server/src/route/contents.ts
index fdcb12b..2a8c4e0 100644
--- a/packages/server/src/route/contents.ts
+++ b/packages/server/src/route/contents.ts
@@ -213,6 +213,15 @@ function getRescanDocumentHandler(controller: DocumentAccessor) {
 export const getContentRouter = (controller: DocumentAccessor) => {
 	const ret = new Router();
 	ret.get("/search", PerCheck(Per.QueryContent), ContentQueryHandler(controller));
+	ret.get("/_gid", PerCheck(Per.QueryContent), async (ctx, next) => {
+		const gid_list = ParseQueryArray(ctx.query.gid).map((x) => Number.parseInt(x))
+		if (gid_list.some((x) => Number.isNaN(x))) {
+			return sendError(400, "gid is not a number");
+		}
+		const r = await controller.findByGidList(gid_list);
+		ctx.body = r;
+		ctx.type = "json";
+	});
 	ret.get("/:num(\\d+)", PerCheck(Per.QueryContent), ContentIDHandler(controller));
 	ret.all("/:num(\\d+)/(.*)", PerCheck(Per.QueryContent), ContentHandler(controller));
 	ret.post("/:num(\\d+)", AdminOnly, UpdateContentHandler(controller));
diff --git a/packages/server/src/util/gid.ts b/packages/server/src/util/gid.ts
new file mode 100644
index 0000000..d58f3c7
--- /dev/null
+++ b/packages/server/src/util/gid.ts
@@ -0,0 +1,5 @@
+export function extractGidFromFilename(filename: string) {
+	const match = filename.match(/^([0-9]+)(:?\.|\s)/);
+	if (match === null) return null;
+	return Number.parseInt(match[1]);
+}
\ No newline at end of file