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Managed checkpoint 0.4.3 #568

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In preparation for upcoming transition to dblabs spatial-utils (follow-on to dblabs mosaic but for DBR 14.3+, adjusted for various enhancements relating to our productized geospatial APIs):

  • Significant streamlining of internal GDAL Dataset handling to include "hydrating" (loading the object) more lazily
  • Dropped "Mosaic" from the serialized internal objects: MosaicRasterTile, MosaicRasterGDAL, and MosaicRasterBandGDAL.
  • All newly generated RasterTile objects can store the tile payload (BinaryType | StringType | GDAL Dataset) to the configured fuse checkpoint dir (see below); raster tiles generated in 0.4.1 and 0.4.2 can be loaded as-is (structure was different prior to that).

Additionally, there are various maintenance commits, see [DRAFT] CHANGELOG for more.

…cleanup based on configured policies, e.g. file age of 30 minutes.
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