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Forward-compatible groundwork for the SQLAlchemy 1.4 -> 2.0 bump. Every change here is backward-compatible with the current SQLAlchemy 1.4.54 / Flask-SQLAlchemy 2.5.1 baseline, so it does not regress anything while shrinking the eventual version bump. Removed-in-2.0 API fixes (these break on 2.0 but still work on 1.4): - `sqlalchemy.orm.eagerload` (removed alias of `joinedload`) in the security manager. - `sqlalchemy.sql.visitors.VisitableType` (removed) -> `sqlalchemy.types.TypeEngine` in dataset importer and mock_data type hints. - `flask_sqlalchemy.BaseQuery` (removed in FSA 3.x, required by SA 2.0) -> import from `flask_sqlalchemy.query.Query` with a fallback to the FSA 2.x path, in the query/saved-query filters and the report command tests. - `Engine.execute` / raw-string execution -> wrap startup health check in a `Connection` + `text()`, and the secrets re-encryptor in `text()` with a single bind dict and `row._mapping[...]` access. Prospective Annotated Declarative prep (no-ops on 1.4, ease the 2.0 flip): - `__allow_unmapped__` on the FAB declarative base so legacy 1.x annotations are tolerated during incremental migration. - `Mapped[...]` return annotations on `created_by_fk`/`changed_by_fk` and `BaseDatasource.slices`. The `select()` and `case()` syntax changes from the same effort already landed via #40276 / #40275, so they are intentionally excluded here. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>