diff --git a/apps/backend/src/app/db/schema.ts b/apps/backend/src/app/db/schema.ts
index a59754b..f3b1a90 100644
--- a/apps/backend/src/app/db/schema.ts
+++ b/apps/backend/src/app/db/schema.ts
@@ -73,10 +73,7 @@ export const FilesTable = pgTable("files", {
 		})
 		.notNull(),
 
-	groupId: p
-		.uuid("group_id")
-		.notNull()
-		.references(() => FilesGroupTable.uuid),
+	groupId: p.uuid("group_id").references(() => FilesGroupTable.uuid),
 
 	fileSize: p.integer("file_size").notNull(),
 
diff --git a/apps/backend/src/app/files/files.controller.ts b/apps/backend/src/app/files/files.controller.ts
index ffaed1e..2381a41 100644
--- a/apps/backend/src/app/files/files.controller.ts
+++ b/apps/backend/src/app/files/files.controller.ts
@@ -54,7 +54,7 @@ export class FilesController {
 				);
 
 				// Vérifier que les en-têtes nécessaires sont présents
-				if (!_fileName || !_groupId || !_machineId) {
+				if (!_fileName || !_machineId) {
 					throw new BadRequestException("Header(s) manquant(s)");
 				}
 				console.log("Header found !");
@@ -62,7 +62,7 @@ export class FilesController {
 
 				const Params = new Map()
 					.set("fileName", _fileName.toString())
-					.set("groupId", _groupId.toString())
+					.set("groupId", _groupId.toString() || null)
 					.set("uploadedBy", _uploadedBy.toString())
 					.set("machineId", Array(JSON.parse(machineId.toString())))
 					.set("isDocumentation", false)
diff --git a/apps/backend/src/app/files/files.service.ts b/apps/backend/src/app/files/files.service.ts
index d1eb69b..7ec3265 100644
--- a/apps/backend/src/app/files/files.service.ts
+++ b/apps/backend/src/app/files/files.service.ts
@@ -14,7 +14,6 @@ import {
 	MachinesTable,
 } from "apps/backend/src/app/db/schema";
 import { StorageService } from "apps/backend/src/app/storage/storage.service";
-import { data } from "autoprefixer";
 import { eq, ilike } from "drizzle-orm";
 
 @Injectable()
@@ -24,6 +23,9 @@ export class FilesService {
 		private readonly database: DbService,
 	) {}
 
+	//TODO
+	//TODO
+
 	/**
 	 * Retrieves a file from the database and storage by its unique identifier.
 	 *
@@ -119,11 +121,11 @@ export class FilesService {
 			machinesIds.add(machineExists[0].uuid);
 		}
 
-		const _group = data.get("groupId") as string;
+		const _group = data.get("groupId") as string | null;
 		console.log("Linking to group :\n", _group);
-		if (!_group) {
+		/*if (!_group) {
 			throw new NotFoundException(`Group with ID "${_group}" not found`);
-		}
+		}*/
 		// verify that the group exist in the database
 		const groupExists = await this.database
 			.use()
@@ -133,7 +135,7 @@ export class FilesService {
 			.prepare("checkGroupExists")
 			.execute();
 
-		if (groupExists.length === 0) {
+		if (_group && groupExists.length === 0) {
 			throw new NotFoundException(`Group with ID "${_group}" not found`);
 		}
 
@@ -155,7 +157,7 @@ export class FilesService {
 			.insert(FilesTable)
 			.values({
 				fileName: data.get("fileName") as string,
-				groupId: groupExists[0].uuid,
+				groupId: groupExists[0].uuid || null,
 				checksum: saveResult.fileChecksum,
 				extension: saveResult.fileType.extension,
 				fileSize: saveResult.fileSize,
diff --git a/apps/backend/src/app/groups/groups.service.ts b/apps/backend/src/app/groups/groups.service.ts
index 1dd5655..6cfc453 100644
--- a/apps/backend/src/app/groups/groups.service.ts
+++ b/apps/backend/src/app/groups/groups.service.ts
@@ -21,8 +21,26 @@ export class GroupsService {
 	}
 
 	//TODO The method to create a group
+	async newGroup(groupName: string) {
+		return await this.database
+			.use()
+			.insert(FilesGroupTable)
+			.values({
+				groupName: groupName,
+			})
+			.returning()
+			.prepare("newGroup")
+			.execute();
+	}
 
 	//TODO a method to delete a group and place the associated file at a null group reference
+	async deleteGroup(groupId: string) {}
 
 	//TODO a method to get the files of a group in the database by a specific search with limit, offset and a search field (can be blank)
+	async findFilesForGroup(
+		limit: number,
+		offset: number,
+		searchField: string,
+		groupId: string,
+	) {}
 }