Add EXIF fields to Parquet export

The _flatten_record() function was missing the 12 new EXIF metadata
fields, so parquet exports would silently drop camera/lens/exposure data.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ranman

src/imgeda/io/parquet_io.py

@@ -18,6 +18,20 @@ def _flatten_record(rec: ImageRecord) -> dict[str, object]:
         "color_mode": rec.color_mode,
         "num_channels": rec.num_channels,
         "aspect_ratio": rec.aspect_ratio,
+        "camera_make": rec.camera_make or "",
+        "camera_model": rec.camera_model or "",
+        "lens_model": rec.lens_model or "",
+        "focal_length_mm": rec.focal_length_mm if rec.focal_length_mm is not None else 0.0,
+        "focal_length_35mm": rec.focal_length_35mm if rec.focal_length_35mm is not None else 0,
+        "iso_speed": rec.iso_speed if rec.iso_speed is not None else 0,
+        "f_number": rec.f_number if rec.f_number is not None else 0.0,
+        "exposure_time_sec": (
+            rec.exposure_time_sec if rec.exposure_time_sec is not None else 0.0
+        ),
+        "datetime_original": rec.datetime_original or "",
+        "orientation_tag": rec.orientation_tag if rec.orientation_tag is not None else 0,
+        "has_gps_data": rec.has_gps_data,
+        "distortion_risk": rec.distortion_risk or "",
         "phash": rec.phash or "",
         "dhash": rec.dhash or "",
         "is_corrupt": rec.is_corrupt,

tests/test_export.py

@@ -23,6 +23,9 @@ def sample_records(self) -> list[ImageRecord]:
                 color_mode="RGB",
                 num_channels=3,
                 aspect_ratio=1.3333,
+                camera_make="Canon" if i % 2 == 0 else None,
+                focal_length_35mm=14 if i == 0 else 50,
+                distortion_risk="high" if i == 0 else "low",
                 pixel_stats=PixelStats(
                     mean_r=120.0 + i,
                     mean_g=130.0 + i,
@@ -61,12 +64,21 @@ def test_export_and_read_back(self, sample_records: list[ImageRecord], tmp_path:
         assert "pixel_stats.mean_r" in col_names
         assert "corner_stats.delta" in col_names
         assert "is_corrupt" in col_names
+        assert "camera_make" in col_names
+        assert "focal_length_35mm" in col_names
+        assert "distortion_risk" in col_names
 
         # Verify data
         paths = table.column("path").to_pylist()
         assert paths[0] == "/img_0.jpg"
         assert paths[19] == "/img_19.jpg"
 
+        # Verify EXIF data in parquet
+        assert table.column("camera_make").to_pylist()[0] == "Canon"
+        assert table.column("camera_make").to_pylist()[1] == ""  # None → ""
+        assert table.column("focal_length_35mm").to_pylist()[0] == 14
+        assert table.column("distortion_risk").to_pylist()[0] == "high"
+
     def test_export_empty_records(self, tmp_path: Path) -> None:
         pytest.importorskip("pyarrow")
         from imgeda.io.parquet_io import records_to_parquet