diff --git a/deploy/db/spec_events.py b/deploy/db/spec_events.py
index b9e765a..e23081e 100644
--- a/deploy/db/spec_events.py
+++ b/deploy/db/spec_events.py
@@ -17,10 +17,11 @@ def get_next_seq(contract_id):
         conn.autocommit = False
         with conn.cursor() as cur:
             cur.execute(
-                "SELECT COALESCE(MAX(seq), 0) + 1 FROM spec_events WHERE contract_id = %s FOR UPDATE",
+                "SELECT seq FROM spec_events WHERE contract_id = %s ORDER BY seq DESC LIMIT 1 FOR UPDATE",
                 (contract_id,),
             )
-            seq = cur.fetchone()[0]
+            row = cur.fetchone()
+            seq = (row[0] + 1) if row else 1
         conn.commit()
         return seq
     except Exception: