Function extract_sql_safe_filename 

pub fn extract_sql_safe_filename(file_path: &str) -> String

Extracts the filename from a file path and makes it SQL-safe.

For example, from “data/quote_tick/EURUSD/2021-01-01T00-00-00-000000000Z_2021-01-02T00-00-00-000000000Z.parquet”, extracts “2021_01_01t00_00_00_000000000z_2021_01_02t00_00_00_000000000z”.