diff --git a/src/agora/io/signal.py b/src/agora/io/signal.py
index 0708c52601a974c57e646477cd71267c4b732dad..06bae6e166156f644523490feb37ebb44f1cca50 100644
--- a/src/agora/io/signal.py
+++ b/src/agora/io/signal.py
@@ -191,7 +191,6 @@ class Signal(BridgeH5):
                 else set(merged.index)
             )
         # TODO : the following needs clarifying
-        breakpoint()
         with h5py.File(self.filename, "r") as f:
             if "modifiers/picks" in f and picks:
                 if picks:
diff --git a/src/agora/utils/merge.py b/src/agora/utils/merge.py
index ce24d3776a38aeaa82aff3722013af0ca7d18238..bc7cb4b171069fb42a76c325590be12b1eb81485 100644
--- a/src/agora/utils/merge.py
+++ b/src/agora/utils/merge.py
@@ -3,19 +3,11 @@
 Functions to efficiently merge rows in DataFrames.
 """
 import typing as t
-from copy import copy
 
 import numpy as np
 import pandas as pd
-
 from utils_find_1st import cmp_larger, find_1st
 
-# from agora.utils.indexing import (
-#     index_isin,
-#     compare_indices,
-#     validate_association,
-# )
-
 from agora.utils.indexing import index_isin
 
 
diff --git a/src/aliby/pipeline.py b/src/aliby/pipeline.py
index 526388837c8a54408024e757645754010c0fc3af..77bcc356273820bdbfc97718b4a5b1c1826d9564 100644
--- a/src/aliby/pipeline.py
+++ b/src/aliby/pipeline.py
@@ -10,7 +10,6 @@ from pathlib import Path
 
 import h5py
 import numpy as np
-import pandas as pd
 from pathos.multiprocessing import Pool
 from tqdm import tqdm
 
@@ -18,11 +17,7 @@ from agora.abc import ParametersABC, ProcessABC
 from agora.io.metadata import MetaData, parse_logfiles
 from agora.io.reader import StateReader
 from agora.io.signal import Signal
-from agora.io.writer import (
-    LinearBabyWriter,
-    StateWriter,
-    TilerWriter,
-)
+from agora.io.writer import LinearBabyWriter, StateWriter, TilerWriter
 from aliby.baby_client import BabyParameters, BabyRunner
 from aliby.haystack import initialise_tf
 from aliby.io.dataset import dispatch_dataset