feat: identify unused objects

server/internal/objects/fsBackend.ts

@@ -152,6 +152,9 @@ export class FsObjectBackend extends ObjectBackend {
     await store.save(id, hashResult);
     return typeof hashResult;
   }
+  async listAll(): Promise<string[]> {
+    return fs.readdirSync(this.baseObjectPath);
+  }
 }
 
 class FsHashStore {

server/internal/objects/objectHandler.ts

@@ -65,6 +65,7 @@ export abstract class ObjectBackend {
     metadata: ObjectMetadata,
   ): Promise<boolean>;
   abstract fetchHash(id: ObjectReference): Promise<string | undefined>;
+  abstract listAll(): Promise<string[]>;
 }
 
 export class ObjectHandler {
@@ -244,4 +245,11 @@ export class ObjectHandler {
   async deleteAsSystem(id: ObjectReference) {
     return await this.backend.delete(id);
   }
+
+  /**
+   * List all objects
+   */
+  async listAll() {
+    return await this.backend.listAll();
+  }
 }