fix: restore plain Pydantic model identities - #1947
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Fixes #1910.
When a dataset schema is read in a fresh process, plain Pydantic models are not registered in
ModelStore, so the schema previously rebuilt same-named dynamic models. This restores an already loaded original model only when its stored field specification (including nested Pydantic models) matches.The resolver only inspects
sys.modulesand existingBaseModelsubclasses; it never imports a module named by dataset metadata. A same-named model with a mismatched schema is rejected with a warning and the existing dynamic rebuild path is retained.Tests:
pytest tests/unit/lib/test_signal_schema.py -qruff check src/datachain/lib/signal_schema.py tests/unit/lib/test_signal_schema.pyruff format --check src/datachain/lib/signal_schema.py tests/unit/lib/test_signal_schema.pyThis complements #1877, which handles conflicting already-registered models.