Fix Indian Bank extraction and add shared multi-format dates for all banks

app/modules/bank_statement_analyzer/parsers/base.py

@@ -69,8 +69,13 @@ def finalize(df: pd.DataFrame, meta: StatementMeta) -> pd.DataFrame:
         return pd.DataFrame(columns=STANDARD_COLUMNS)
     for c in ['debit','credit','balance']:
         df[c]=pd.to_numeric(df.get(c),errors='coerce')
+    from .common import parse_flexible_date
     for c in ['transaction_date','value_date']:
-        df[c]=pd.to_datetime(df.get(c),errors='coerce',dayfirst=True)
+        values = df.get(c)
+        if values is None:
+            df[c] = pd.NaT
+        else:
+            df[c] = values.map(parse_flexible_date)
     df['narration']=df.get('narration','').fillna('').map(norm)
     df['reference_no']=df.get('reference_no','').fillna('').map(norm)
     df['bank_name']=meta.bank_name