diff --git a/packages/server/src/db/doc.ts b/packages/server/src/db/doc.ts
index 0afa8d2..9ccfc9f 100644
--- a/packages/server/src/db/doc.ts
+++ b/packages/server/src/db/doc.ts
@@ -21,6 +21,20 @@ class SqliteDocumentAccessor implements DocumentAccessor {
 		throw new Error("Method not implemented.");
 	}
 	async addList(content_list: DocumentBody[]): Promise<number[]> {
+		if (content_list.length === 0) return [];
+		if (content_list.length > 256) {
+			// if content_list is too long, split it.
+			const chunkLength = 256;
+			const chunked = [];
+			for (let i = 0; i < content_list.length; i += chunkLength) {
+				chunked.push(content_list.slice(i, i + chunkLength));
+			}
+			const ids = [];
+			for (const chunk of chunked) {
+				ids.push(await this.addList(chunk));
+			}
+			return ids.flat();
+		}
 		return await this.kysely.transaction().execute(async (trx) => {
 			// add tags
 			const tagCollected = new Set<string>();