chore: add transaction fees for attestation requests

internal/migrations/024-attestation-actions.sql

@@ -48,6 +48,24 @@ $max_fee INT8
     if $action_id = 0 {
         ERROR('Action not allowed for attestation: ' || $action_name);
     }
+
+    -- ===== FEE COLLECTION =====
+    -- Collect 40 TRUF flat fee for attestation request
+    $attestation_fee := '40000000000000000000'::NUMERIC(78, 0); -- 40 TRUF with 18 decimals
+    $caller_balance := ethereum_bridge.balance(@caller);
+
+    IF $caller_balance < $attestation_fee {
+        ERROR('Insufficient balance for attestation. Required: 40 TRUF');
+    }
+
+    -- Verify leader address is available
+    IF @leader_sender IS NULL {
+        ERROR('Leader address not available for fee transfer');
+    }
+
+    $leader_addr TEXT := encode(@leader_sender, 'hex')::TEXT;
+    ethereum_bridge.transfer($leader_addr, $attestation_fee);
+    -- ===== END FEE COLLECTION =====
 
     -- Get current block height
     $created_height := @height;

tests/streams/attestation/attestation_request_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/trufnetwork/kwil-db/common"
+	"github.com/trufnetwork/kwil-db/core/crypto/auth"
 	"github.com/trufnetwork/kwil-db/core/types"
 	kwilTesting "github.com/trufnetwork/kwil-db/testing"
 	attestation "github.com/trufnetwork/node/extensions/tn_attestation"
@@ -144,11 +145,13 @@ func runAttestationUnauthorizedBlocked(t *testing.T, ctx context.Context, platfo
 		TxContext: &common.TxContext{
 			Ctx: ctx,
 			BlockContext: &common.BlockContext{
-				Height: 1,
+				Height:   1,
+				Proposer: helper.leaderPub, // Required for @leader_sender
 			},
-			Signer: unauthorizedAddr.Bytes(),
-			Caller: unauthorizedAddr.Address(),
-			TxID:   platform.Txid(),
+			Signer:        unauthorizedAddr.Bytes(),
+			Caller:        unauthorizedAddr.Address(),
+			TxID:          platform.Txid(),
+			Authenticator: auth.EthPersonalSignAuth, // Required for balance operations
 		},
 	}