fix: prevent embedding corruption in Valkey and Redis when vector is None (#4336) (#4362)

Co-authored-by: kartik-mem0 <kartik.labhshetwar@mem0.ai>

mem0/vector_stores/redis.py

@@ -191,9 +191,12 @@ class RedisDB(VectorStoreBase):
             "memory": payload["data"],
             "created_at": int(datetime.fromisoformat(payload["created_at"]).timestamp()),
             "updated_at": int(datetime.fromisoformat(payload["updated_at"]).timestamp()),
-            "embedding": np.array(vector, dtype=np.float32).tobytes(),
         }
 
+        # Only update embedding if vector is provided
+        if vector is not None:
+            data["embedding"] = np.array(vector, dtype=np.float32).tobytes()
+
         for field in ["agent_id", "run_id", "user_id"]:
             if field in payload:
                 data[field] = payload[field]

mem0/vector_stores/valkey.py

@@ -491,9 +491,12 @@ class ValkeyDB(VectorStoreBase):
                 "hash": payload.get("hash", f"hash_{vector_id}"),  # Use a default hash if not provided
                 "memory": payload.get("data", f"data_{vector_id}"),  # Use a default data if not provided
                 "created_at": int(datetime.fromisoformat(payload["created_at"]).timestamp()),
-                "embedding": np.array(vector, dtype=np.float32).tobytes(),
             }
 
+            # Only update embedding if vector is provided
+            if vector is not None:
+                hash_data["embedding"] = np.array(vector, dtype=np.float32).tobytes()
+
             # Add updated_at if available
             if "updated_at" in payload:
                 hash_data["updated_at"] = int(datetime.fromisoformat(payload["updated_at"]).timestamp())