diff --git a/src/storage/adapters/baseStorageAdapter.ts b/src/storage/adapters/baseStorageAdapter.ts
index 328d347f..2102d92d 100644
--- a/src/storage/adapters/baseStorageAdapter.ts
+++ b/src/storage/adapters/baseStorageAdapter.ts
@@ -95,8 +95,10 @@ export abstract class BaseStorageAdapter implements StorageAdapter {
 
   abstract getVerbMetadata(id: string): Promise<any | null>
 
-  // HNSW Index Persistence
-  // These methods enable HNSW index rebuilding after container restarts
+  // Vector Index Persistence (Brainy 8.0 — algorithm-neutral surface)
+  // The legacy `saveHNSWData` / `getHNSWData` names persist as default-method
+  // aliases so existing implementations continue to work mid-migration; the
+  // 8.0 final cleanup commit removes the old names.
 
   abstract getNounVector(id: string): Promise<number[] | null>
 
@@ -110,6 +112,32 @@ export abstract class BaseStorageAdapter implements StorageAdapter {
     connections: Record<string, string[]>
   } | null>
 
+  /**
+   * Persist vector-index graph state for an entity (Brainy 8.0 name).
+   * Default implementation delegates to {@link saveHNSWData}; concrete
+   * adapters may override directly. The final 8.0 cleanup removes the
+   * legacy `saveHNSWData` name.
+   */
+  async saveVectorIndexData(nounId: string, data: {
+    level: number
+    connections: Record<string, string[]>
+  }): Promise<void> {
+    return this.saveHNSWData(nounId, data)
+  }
+
+  /**
+   * Read vector-index graph state for an entity (Brainy 8.0 name).
+   * Default implementation delegates to {@link getHNSWData}; concrete
+   * adapters may override directly. The final 8.0 cleanup removes the
+   * legacy `getHNSWData` name.
+   */
+  async getVectorIndexData(nounId: string): Promise<{
+    level: number
+    connections: Record<string, string[]>
+  } | null> {
+    return this.getHNSWData(nounId)
+  }
+
   abstract saveHNSWSystem(systemData: {
     entryPointId: string | null
     maxLevel: number