To do list

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 (PRAGMA foreign_key_list(%table_name%); may be useful)
rest of core functions(https://sqlite.org/lang_corefunc.html)
ATTACH
blob incremental I/O https://sqlite.org/c3ref/blob_open.html
CREATE VIEW and other view operations https://sqlite.org/lang_createview.html
query static check for correct order (e.g. GROUP BY after WHERE)
WINDOW
SAVEPOINT https://www.sqlite.org/lang_savepoint.html
add static_assert in crud get* functions in case user passes where_t instead of id to make compilation error more clear (example https://github.com/fnc12/sqlite_orm/issues/485)
named constraints: constraint can have name CREATE TABLE heroes(id INTEGER CONSTRAINT pk PRIMARY KEY)
FILTER clause https://sqlite.org/lang_aggfunc.html#aggfilter
scalar math functions https://sqlite.org/lang_mathfunc.html
improve DROP COLUMN in sync_schema https://sqlite.org/lang_altertable.html#altertabdropcol
UPDATE FROM support https://sqlite.org/lang_update.html#upfrom
iif() function https://sqlite.org/lang_corefunc.html#iif
add strong typed collate syntax (more info here)
strict tables https://sqlite.org/stricttables.html
static assert when UPDATE is called with no PKs
json_each and json_tree functions for JSON1 extension
update hook
RAISE

Please feel free to add any feature that isn't listed here and not implemented yet.