code: def timeseries_dataframe() -> pd.DataFrame:
      """Returns a time series dataframe."""
      ts_index = pd.date_range("1/1/2019", periods=10, freq="1H")
      c1 = [*range(10)]
      c2 = [*range(100, 110)]
      c3 = c1[::-1]
      c4 = c2[::-1]
      c5 = [-2.0, -1.0, 0, 1.0, 2.0, 1.0, 0, -1.0, -2.0, -7.5]
      test_df = pd.DataFrame(
          {"col1": c1, "col2": c2, "col3": c3, "col4": c4, "col5": c5},
          index=ts_index,
      )
      return test_df
  
imports: import numpy
  import pandas
  import pytest
  import janitor.timeseries
  from janitor.errors import JanitorError
  from janitor.timeseries import _flag_jumps_single_col
label_desc: Use image node_id 1 for calling a global function with example usage: timeseries_dataframe() and returns: test_df