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Bug: GET /api/v1/epochs/{N}/participants returns 500 for past epochs (CreatedAtBlockHeight=0) #983

Open @mingles-agent opened 2026-03-31 08:51 UTC 0 comments Updated 2026-03-31 08:51 UTC

Bug

GET /api/v1/epochs/{N}/participants returns 500 Internal Server Error for past epochs. Current epoch works fine.

Repro

GET http://node1.gonka.ai:8000/api/v1/epochs/215/participants
→ 500 Internal Server Error: height must be greater than 0, but got 0

Epoch 215 consistently reproduces this. Any past epoch where CreatedAtBlockHeight was not yet populated will fail.

Root Cause

In queryActiveParticipants (get_participants_handler.go):

  1. First query (no height) fetches activeParticipants
  2. blockHeight := activeParticipants.CreatedAtBlockHeight — for old epochs this is 0 (field was not populated at storage time)
  3. Second call QueryByKeyWithOptions(..., height=0, prove=true) — CometBFT rejects height=0 with the above error

Fix

Check if blockHeight == 0 before the second query. If so, skip the proof query and return the first result directly, with a Warn log for observability.

Fix is implemented in PR #973.

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