Add backfilling for lotus

scripts/tests/api_compare/docker-compose.yml

@@ -173,10 +173,13 @@ services:
         # `sethead` right after `sync wait` to ensure the head is not set in middle of a sync
         lotus sync wait
         FULLNODE_API_INFO="$(cat /var/lib/lotus/token):/dns/lotus/tcp/${LOTUS_RPC_PORT}/http"
-        lotus chain sethead --epoch $(($(ls /data/*.car.zst | tail -n 1 | grep -Eo '[0-9]+' | tail -n 1) - 50))
+        HEAD_EPOCH=$(ls /data/*.car.zst | tail -n 1 | grep -Eo '[0-9]+' | tail -n 1)
+        lotus chain sethead --epoch $(($HEAD_EPOCH - 50))
         # wait for 30s to make sure the re-validation starts
         sleep 30
         lotus sync wait
+        # backfill the index db
+        lotus index validate-backfill --from $(($HEAD_EPOCH - 50)) --to $(($HEAD_EPOCH - 100))
         # After the sync is done, import the wallet for signing blocks. It might be already there, which will return an error. We ignore it.
         echo $MINER_WORKER_KEY | lotus wallet import || true
   api-compare: