apps/server/src/checkpointing/CheckpointDiffQuery.test.ts | 10 +++-
 apps/server/src/checkpointing/CheckpointDiffQuery.ts      | 69 ++++++++++++----------
 apps/server/src/checkpointing/Errors.test.ts              | 39 +++++++++++++
 apps/server/src/checkpointing/Errors.ts                   | 98 +++++++++++++++++++++++++-------
 4 files changed, 164 insertions(+), 52 deletions(-)