Delete duplicate values (#2633)

db/migrations/state/0010.sql

@@ -1,6 +1,14 @@
 -- +migrate Up
 CREATE INDEX IF NOT EXISTS l2block_block_hash_idx ON state.l2block (block_hash);
 
+DELETE FROM state.sequences a USING (
+    SELECT MIN(ctid) as ctid, from_batch_num
+    FROM state.sequences 
+    GROUP BY from_batch_num HAVING COUNT(*) > 1
+) b
+WHERE a.from_batch_num = b.from_batch_num 
+AND a.ctid <> b.ctid;
+
 ALTER TABLE state.sequences ADD PRIMARY KEY(from_batch_num);
 ALTER TABLE state.trusted_reorg  ADD PRIMARY KEY(timestamp);
 ALTER TABLE state.sync_info ADD PRIMARY KEY(last_batch_num_seen, last_batch_num_consolidated, init_sync_batch);