Read Segment Index Files, Segment Stats for Annot. w/ FallbackL.

[frcroth]

URL of deployed dev instance (used for testing):

• https://___.webknossos.xyz

Steps to test:

• Test the datastore routes segmentIndex, segmentVolume and boundingBox (test with l4_sample)
• Test the fallback behavior: When a volume tracing has a fallback, it will by default return the segment file index. Once something changed in the corresponding buckets by annotating, all affected segments will be queried from the mutable segment index

TODOs:

• Test Scenario 1
  • Create a volume tracing annotation for a dataset with segmentation layer using that as fallback layer
  • The tracing has "hasSegmentIndex" true
  • When annotating a new segment, fossilDB is filled with content
  • When querying segment volume for the new segment, the correct/a sensible value is returned
  • When querying a segment volume for a segment in the file, the correct value is returned
  • Select an existing segment id, annotate
  • Now the segment volume is the one you just annotated
• A lot of things are marked as TODO
• The delete segment data action should be limited to segments smaller than x buckets -> Followup?
• Handle ds without mag 1
• Bounding Box
• additional coords -> Followup?
• Create simple test dataset
• Speed up saving

TODOs frontend:

• use datastore host if no volume annotation layer is visible (cases: no annotation or skeleton-only annotation)
• remove code duplication by finding out where to put helper method (context menu and stats modal)
• make sure the right conditions are tested
• find out whether meshes should use index file in dataview mode

Followups

• Remove await in nml parsing (Remove await from AnnotationUploadService #7551)
• Duplicate segment index instead of building new one on duplicateData #7554
• Support ND segmentations with segment index file #7556
• Use datastore segment index for ad-hoc meshing #7615
• Limit delete segment data action to segments smaller than x buckets #7618

Issues:

• fixes segment-to-bucket index for volume annotations *with fallback segmentation* #7132

---

• Updated changelog
• Needs datastore update after deployment

[fm3]

@frcroth I fixed a couple of cases and re-tested. It looks good to me now. Please have a look at my latest commits and if you think this is now ready, feel free to merge on monday when you return :)

[philippotto]

front-end looks good, too :) only left a comment about one variable name..