sqlite_orm is a wonderful library but there are still features that are not implemented. Here you can find a list of them:
FOREIGN KEY- sync_schema fk comparison and ability of two tables to have fk to each other- rest of core functions(https://sqlite.org/lang_corefunc.html)
CASEHAVINGEXISTS- asterisk in raw select:
SELECT rowid, * FROM table ATTACH- blob incremental I/O https://sqlite.org/c3ref/blob_open.html
- reusing of prepared statements - useful for query optimisation
- subselect
- backup API https://www.sqlite.org/backup.html
- busy handler https://sqlite.org/c3ref/busy_handler.html
- CAST https://sqlite.org/lang_expr.html#castexpr
- CREATE VIEW and other view operations https://sqlite.org/lang_createview.html
- triggers
Please feel free to add any feature that isn't listed here and not implemented yet.