doc: add TODOs

doc/TODO.txt

@@ -26,6 +26,14 @@ TODO: language-server-for-TODO.txt
 TODO: auto-migration-checker
 - Use `pkg/schema` to test whether a base schema plus a migration equals a new schema
 
+TODO: codegen SaveXyz update path doesn't check foreign keys
+- Insert path has FK error handling, but the update path wraps everything in Must
+- An update that violates an FK constraint will panic instead of returning an error
+
 TODO: codegen `without rowid` tables properly
 
 TODO: generated test file inclues global test DB setup, which is wrong
+
+TODO: join-tables
+- handle codegen for without rowid tables properly
+- add "get all "