use mint field of portal deposit tx

indexer/migrations/20230523_create_schema.sql

@@ -95,7 +95,11 @@ CREATE TABLE IF NOT EXISTS l1_transaction_deposits (
     -- transaction data
     from_address VARCHAR NOT NULL,
     to_address   VARCHAR NOT NULL,
+
+    -- This refers to the amount MINTED on L2 (msg.value of the L1 transaction). Important distinction from
+    -- the `value` field of the deposit transaction which simply is the value transferred to specified recipient.
     amount       UINT256 NOT NULL,
+
     gas_limit    UINT256 NOT NULL,
     data         VARCHAR NOT NULL,
     timestamp    INTEGER NOT NULL CHECK (timestamp > 0)

indexer/processors/contracts/optimism_portal.go

@@ -71,7 +71,7 @@ func OptimismPortalTransactionDepositEvents(contractAddress common.Address, db *
 			Tx: database.Transaction{
 				FromAddress: txDeposit.From,
 				ToAddress:   txDeposit.To,
-				Amount:      depositTx.Value,
+				Amount:      depositTx.Mint,
 				Data:        depositTx.Data,
 				Timestamp:   transactionDepositEvents[i].Timestamp,
 			},