fix(postgres): query master for latest block to avoid replication lag (#3305)

Author: UnbornAztecKing

indexer/packages/postgres/src/constants.ts

@@ -125,6 +125,9 @@ export const DEFAULT_POSTGRES_OPTIONS : Options = config.USE_READ_REPLICA
   ? {
     readReplica: true,
   } : {};
+export const USE_MASTER_POSTGRES_OPTIONS : Options = {
+  readReplica: false,
+};
 
 // The maximum number of parent subaccounts per address.
 export const MAX_PARENT_SUBACCOUNTS: number = 128;

indexer/packages/postgres/src/stores/block-table.ts

@@ -1,7 +1,7 @@
 import { logger } from '@dydxprotocol-indexer/base';
 import { QueryBuilder } from 'objection';
 
-import { DEFAULT_POSTGRES_OPTIONS } from '../constants';
+import { DEFAULT_POSTGRES_OPTIONS, USE_MASTER_POSTGRES_OPTIONS } from '../constants';
 import { setupBaseQuery, verifyAllRequiredFields } from '../helpers/stores-helpers';
 import Transaction from '../helpers/transaction';
 import BlockModel from '../models/block-model';
@@ -110,7 +110,7 @@ export async function findByBlockHeight(
 }
 
 export async function getLatest(
-  options: Options = DEFAULT_POSTGRES_OPTIONS,
+  options: Options = USE_MASTER_POSTGRES_OPTIONS,
 ): Promise<BlockFromDatabase> {
   const baseQuery: QueryBuilder<BlockModel> = setupBaseQuery<BlockModel>(
     BlockModel,