feat: add ZERO_ADDRESS constant and remove unused fvalue field from Transfer type

Author: toniocodo

src/constants/addresses.ts

@@ -0,0 +1 @@
+export const ZERO_ADDRESS = '0x0000000000000000000000000000000000000000';

src/indexers/collector/EventHandlers.ts

@@ -1,5 +1,3 @@
-import { toNumber } from 'dnum';
-
 import { getTokenByAddress } from '../../utils/getToken';
 import { ERC20 } from './generated';
 
@@ -29,7 +27,6 @@ ERC20.Transfer.handler(
         from: event.params.from,
         to: event.params.to,
         value: event.params.value,
-        fvalue: toNumber([event.params.value, token.decimals]),
         timestamp: event.block.timestamp,
         txHash: event.transaction.hash,
         token_id: token.id,

src/indexers/collector/schema.graphql

@@ -10,7 +10,6 @@ type Transfer {
   from: String!
   to: String!
   value: BigInt!
-  fvalue: Float!
   token: Token!
   timestamp: Int!
   txHash: String!

src/indexers/oToken/EventHandlers.ts

@@ -1,3 +1,4 @@
+import { ZERO_ADDRESS } from '../../constants/addresses';
 import {
   generateOTokenActivityId,
   generateOTokenAddressId,
@@ -9,9 +10,6 @@ import { getTokenByAddress } from '../../utils/getToken';
 import { OToken } from './generated';
 import { calculateRebase } from './oTokenRebase';
 
-// Zero address constant
-const ZERO_ADDRESS = '0x0000000000000000000000000000000000000000';
-
 /**
  * Handle Transfer events
  * Updates OTokenAddress balances and creates history/activity records