The /api/query_table and /api/get_table_columns endpoints accepted arbitrary
table_name values that were interpolated directly into SQL f-strings. Since
api_public is true, any unauthenticated user could exploit this. Now validates
table_name and time_field against TABLES_CONFIG before reaching the database.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>