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Port SqliteSessionQueue to a SQLAlchemy Core / SQLModel hybrid that keeps the existing public API and DB schema (migrations and triggers untouched). Hot paths (enqueue bulk insert, dequeue, bulk cancel/delete, list with cursor pagination, status aggregations) use Core to avoid ORM hydration overhead; single-row reads stay ORM-style for clarity. - Add SqlModelSessionQueue alongside the legacy SqliteSessionQueue - Add the missing `workflow` column to SessionQueueTable (was added by migration_2 but never declared on the SQLModel) - Wire dependencies.py to the new implementation - Add 36 unit tests covering enqueue/dequeue, status mutations, bulk cancel/delete, prune-to-limit, retry, pagination and aggregations - Avoid nested write sessions on the single StaticPool connection by reading the current item before opening the outer write session