prevent negative veBAL balances (#1445)

Author: markusbkoch

deprecated-dune-v1-abstractions/ethereum/balancer/view_vebal_balances.sql

@@ -97,9 +97,13 @@ SELECT
     b.provider,
     bpt_balance,
     lock_period,
-    COALESCE((bpt_balance *
-    (lock_period / (365*86400)) *
-    ((unlocked_at - (FLOOR(EXTRACT(EPOCH FROM b.day))+86400)) / lock_period)), 0) AS vebal
+    GREATEST(
+        COALESCE((bpt_balance *
+        (lock_period / (365*86400)) *
+        ((unlocked_at - (FLOOR(EXTRACT(EPOCH FROM b.day))+86400)) / lock_period)), 0) ,
+        
+        0
+    ) AS vebal
 FROM running_balances b
 LEFT JOIN locks_info l
 ON l.provider = b.provider