Spec validée par brainstorming : inscription avec vérification email,
connexion (Flask-Login), reset password par token stocké en DB,
page compte, SQLite + sqlite3 stdlib, Flask-Mail, CSRF via Flask-WTF.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Replace global Polars dataframes in src/utils.py (lines 891-913) with
an on-disk DuckDB database, built at startup from decp_prod.parquet.
Keeps two small search-path frames (df_acheteurs, df_titulaires) in
memory; moves heavy filtering and aggregation to DuckDB via a
query_marches helper that returns pl.DataFrame.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Colin Maudry