TudorandClaude Opus 5
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`backend/migration.py` and `scripts/migrate_csv_to_db.py` import `School`, `SchoolResult`, `init_db` and `set_db_schema_version` — names that no longer exist. `scripts/geocode_schools.py` imports the same removed ORM model. None of the three can be imported against the current backend, so they were not dormant utilities anyone could fall back on; they were files that would fail on the first line. `backend/version.py` existed only to hand `SCHEMA_VERSION` to that importer, and the FastAPI lifespan performs no version-triggered import. Three symbols go with them, each confirmed to have no caller: the unvectorised `haversine_distance`, superseded by the inline NumPy calculation in search; `fetcher`, an SWR helper for a dependency this project does not install; and `kmToMiles`. `calculateDistance` stays — CutoffMapPanel uses it. Two comments pointed at `migrate_csv_to_db.py --drop` to explain why Payload owns its own schema. The reason survives the script: blog content must stay clear of the school marts and Airflow's metadata. Reworded rather than deleted, so the constraint keeps its justification. docs/LEGACY_CODE.md records what was removed and where to find it in history. It also records what was deliberately *not* removed, which is the more useful half: unused UI components awaiting a design decision, manual data utilities whose operators a repository search cannot see, and fallbacks that look obsolete but are load-bearing — `data_loader.py`'s older-mart branches, the generated GIAS dictionary copies, and the `legacy`-named dbt models that annual DAG selectors explicitly include. A zero-import count is evidence, not a verdict. The scripts that fetch DfE CSVs are marked historical and kept, pending confirmation that nobody runs them by hand. Checked: 190 backend tests, 429 frontend tests, `tsc --noEmit` clean. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016y2J6bs8gbuSJbH18w7Tan