Adding codes to help filter data before registration date and after study period/data ever recorded.

[daimm2000]

No description provided.

[biblicabeebli]

Items to change

• Add a pandas dataframe type indicator on the df param
• handle the case of end_date and not study_period_days and clean up and document the followup changes to those logic blocks.

[biblicabeebli]

Checking in on this pull request, obscure python thing:

def filter_data(df: pd.DataFrame, study_period_days: int | None = None) -> pd.DataFrame:

The very convenient int | None syntax is not supported in python 3.8, it errors with
TypeError: unsupported operand type(s) for |: 'type' and 'NoneType'

We will be moving probably to 3.11 Beiwe-wide soon, 3.8 goes out of support in October. If you think it matters that this code retains compatibility with 3.8 the equivalent gross yucky old-style is:

from typing import Optional
def filter_data(df: pd.DataFrame, study_period_days: Optional[int] = None) -> pd.DataFrame: