Update README for fetched OFMX data

Author: ogrun

README.md

@@ -9,9 +9,9 @@ Importer and schema are functional for the LK sample dataset. See `TODO.md` for
 - `pip install -e .` installs the package and the `psycopg` dependency.
 - `config/ofmx2pgsql.example.ini` shows the supported config keys.
 - `Dockerfile` builds a container that downloads a snapshot and imports it into PostGIS.
+- `scripts/fetch_ofmx.sh` downloads and extracts a snapshot locally for CLI testing.
 
 ## Repository Layout
-- `ofmx_lk/` sample OFMX data and reference materials.
 - `src/ofmx2pgsql/` application package (CLI, parsing, DB loaders).
 - `sql/migrations/` PostGIS schema migrations.
 - `config/` example configuration files.
@@ -28,12 +28,13 @@ Importer and schema are functional for the LK sample dataset. See `TODO.md` for
 ## Development Commands
 - `python -m unittest discover -s tests` runs the minimal CLI smoke tests in `tests/`.
 - `python -m ofmx2pgsql --help` verifies the CLI entry point is wired.
-- `python -m ofmx2pgsql scan ofmx_lk/isolated` lists sample `.ofmx` files.
-- `python -m ofmx2pgsql scan ofmx_lk/isolated --schema ofmx` prints a schema label before the list.
-- `python -m ofmx2pgsql import --dsn \"postgresql://...\" --schema ofmx --ofmx ofmx_lk/isolated/ofmx_lk.ofmx --shapes ofmx_lk/isolated/ofmx_lk_ofmShapeExtension.xml --apply-migrations --verbose` loads the sample dataset.
-- `python -m ofmx2pgsql import --dsn \"postgresql://...\" --ofmx ofmx_lk/isolated/ofmx_lk.ofmx --shapes ofmx_lk/isolated/ofmx_lk_ofmShapeExtension.xml --dry-run --verbose` parses without writing to the database.
-- `python -m ofmx2pgsql validate --dsn \"postgresql://...\" --schema ofmx --ofmx ofmx_lk/isolated/ofmx_lk.ofmx --shapes ofmx_lk/isolated/ofmx_lk_ofmShapeExtension.xml` compares parsed counts with stored counts.
-- `python -m ofmx2pgsql validate --dsn \"postgresql://...\" --ofmx ofmx_lk/isolated/ofmx_lk.ofmx --output-json` emits validation output as JSON.
+- `scripts/fetch_ofmx.sh` downloads and extracts the LK snapshot into `data/`.
+- `python -m ofmx2pgsql scan data/ofmx_lk/isolated` lists `.ofmx` files.
+- `python -m ofmx2pgsql scan data/ofmx_lk/isolated --schema ofmx` prints a schema label before the list.
+- `python -m ofmx2pgsql import --dsn \"postgresql://...\" --schema ofmx --ofmx data/ofmx_lk/isolated/ofmx_lk.ofmx --shapes data/ofmx_lk/isolated/ofmx_lk_ofmShapeExtension.xml --apply-migrations --verbose` loads the sample dataset.
+- `python -m ofmx2pgsql import --dsn \"postgresql://...\" --ofmx data/ofmx_lk/isolated/ofmx_lk.ofmx --shapes data/ofmx_lk/isolated/ofmx_lk_ofmShapeExtension.xml --dry-run --verbose` parses without writing to the database.
+- `python -m ofmx2pgsql validate --dsn \"postgresql://...\" --schema ofmx --ofmx data/ofmx_lk/isolated/ofmx_lk.ofmx --shapes data/ofmx_lk/isolated/ofmx_lk_ofmShapeExtension.xml` compares parsed counts with stored counts.
+- `python -m ofmx2pgsql validate --dsn \"postgresql://...\" --ofmx data/ofmx_lk/isolated/ofmx_lk.ofmx --output-json` emits validation output as JSON.
 - `python -m ofmx2pgsql import --config config/ofmx2pgsql.example.ini --dry-run --verbose` uses config values with CLI overrides.
 - `python -m ofmx2pgsql validate --config config/ofmx2pgsql.example.ini --output-json` uses config defaults with JSON output.
 
@@ -52,6 +53,6 @@ docker run --rm \
 
 
 ## Data Notes
-The sample data in `ofmx_lk/` is treated as reference input. Avoid editing these files unless intentionally updating fixtures.
+The LK sample data is fetched on demand into `data/ofmx_lk/` via `scripts/fetch_ofmx.sh` and is ignored by git.
 
 Airspace records in the LK sample reuse `AseUid/@mid`, so `ofmx.airspaces.ofmx_id` is not unique. The schema uses a composite uniqueness constraint on `(ofmx_id, region, code_id, code_type, name)` to preserve distinct entries while keeping imports idempotent.