SQLite format 3@ .v s?indexidx_tiletilesCREATE UNIQUE INDEX idx_tile on tiles (zoom_level, tile_column, tile_row)IgtablemetadatametadataCREATE TABLE metadata (name text, value text)(/tabletilestilesCREATE TABLE tiles ( zoom_level integer, tile_column integer, tile_row integer, tile_data blob , last_modified datetime DEFAULT (datetime('now','localtime')) )