BullMQ blockSync job stuck in active state— Fix: SSH to server, clear queue: docker exec <backend> node -e "...Queue('blockSync')...obliterate()..."; restart workers
PM2 sync process crashed— Fix: Check PM2 logs: docker exec <pm2> pm2 logs --lines 50; restart: docker compose restart pm2
EVM indexer disabled on chain node— Fix: Set enable-indexer = true in app.toml, restart node, run: intgd index-eth-tx backward && intgd index-eth-tx forward
Workers disconnected from Redis/RPC— Fix: docker compose restart high_priority_worker medium_priority_worker low_priority_worker
Missing DB columns causing silent INSERT failures— Fix: Run migration: docker exec <backend> npx sequelize-cli db:migrate