Update cow_protocol_arbitrum_batches.sql

Reverting the hardcoded logic back.

models/cow_protocol/arbitrum/cow_protocol_arbitrum_batches.sql

@@ -16,6 +16,36 @@
 }}
 
 WITH
+-- Find the PoC Query here: https://dune.com/queries/3840594
+solver_activation_events AS (
+    SELECT
+      solver,
+      evt_block_number,
+      evt_index,
+      TRUE AS activated
+    FROM {{ source('gnosis_protocol_v2_arbitrum', 'GPv2AllowListAuthentication_evt_SolverAdded') }}
+    UNION
+    SELECT
+      solver,
+      evt_block_number,
+      evt_index,
+      FALSE AS activated
+    FROM {{ source('gnosis_protocol_v2_arbitrum', 'GPv2AllowListAuthentication_evt_SolverRemoved') }}
+  ),
+  ranked_solver_events as (
+    select
+        rank() over (partition by solver order by evt_block_number desc, evt_index desc) as rk,
+        solver,
+        evt_block_number,
+        evt_index,
+        activated as active
+    from solver_activation_events
+),
+registered_solvers as (
+    select solver as address, active
+    from ranked_solver_events
+    where rk = 1
+),
 batch_counts as (
     select try_cast(date_trunc('day', s.evt_block_time) as date) as block_date,
            s.evt_block_time,
@@ -36,7 +66,7 @@ batch_counts as (
             {% if is_incremental() %}
             AND {{ incremental_predicate('i.evt_block_time') }}
             {% endif %}
-        join {{ source('cow_protocol_arbitrum', 'solvers') }}
+        join registered_solvers
             on solver = address
     {% if is_incremental() %}
     WHERE {{ incremental_predicate('s.evt_block_time') }}