GpkgBlobRow

ORMLite row for one entry in a 3D Tiles GeoPackage extension blob table. Column shape follows the OGC 3D Tiles GeoPackage Extension community proposal:

• tile_path TEXT PK — content URI (relative or absolute) the tile was fetched from.

• tile_data BLOB — raw payload bytes (tileset.json text, b3dm/i3dm/pnts/cmpt/glb binary).

WorldWind extends the proposed shape with conditional-fetch + bookkeeping columns; these are tolerated by other readers since the GPKG spec lets non-required columns exist on any user table:

• content_type TEXT — HTTP Content-Type at fetch time (nullable).

• etag TEXT — HTTP ETag at fetch time (nullable; for future revalidation).

• last_modified INTEGER — HTTP Last-Modified epoch-millis (nullable).

• cached_at INTEGER — epoch-millis the row was written. Drives earth.worldwind.layer.cache.CachePolicy.staleAfter.

• size_bytes INTEGER — LENGTH(tile_data) precomputed at insert. Lets SUM(size_bytes) evict by byte budget without scanning each BLOB body.

• response_url TEXT — post-redirect URL the body was served from. Null when same as tile_path. Lets the cache replay the right base for relative URI resolution.

The @DatabaseTable annotation is intentionally absent — the table name is supplied per-dataset at DAO construction so a single GeoPackage can host many independent 3D Tiles blob caches.