adapt graphql request to Hasura engine

res/indexer-queries.graphql

 query IdentityNameByIndex($index: Int!) {
-  identities(where: { index_eq: $index }) {
+  identity(where: { index: { _eq: $index } }) {
     name
   }
 }
 
 query NamesByIndexes($indexes: [Int!]!) {
-  identities(where: {index_in: $indexes}) {
+  identity(where: { index: { _in: $indexes } }) {
     index
     name
   }
 }
 
 query IdentityInfo($index: Int!) {
-  identities(where: { index_eq: $index }) {
+  identity(where: { index: { _eq: $index } }) {
     name
-    certIssued(orderBy: expireOn_DESC, where: { isActive_eq: true }) {
+    certIssued(
+      orderBy: { expireOn: DESC }
+      where: { isActive: { _eq: true } }
+    ) {
       receiver {
         name
       }
     }
-    certReceived(orderBy: expireOn_DESC, where: { isActive_eq: true }) {
+    certReceived(
+      orderBy: { expireOn: DESC }
+      where: { isActive: { _eq: true } }
+    ) {
       issuer {
         name
       }
@@ -27,12 +33,12 @@ query IdentityInfo($index: Int!) {
     linkedAccount {
       id
     }
-    smithCertIssued(orderBy: createdOn_DESC) {
+    smithCertIssued(orderBy: { createdOn: DESC }) {
       receiver {
         name
       }
     }
-    smithCertReceived(orderBy: createdOn_DESC) {
+    smithCertReceived(orderBy: { createdOn: DESC }) {
       issuer {
         name
       }
@@ -41,13 +47,13 @@ query IdentityInfo($index: Int!) {
 }
 
 query IdentityNameByPubkey($pubkey: String!) {
-  identities(where: { account: { id_eq: $pubkey } }) {
+  identity(where: { account: { id: { _eq: $pubkey } } }) {
     name
   }
 }
 
 query WasIdentityNameByPubkey($pubkey: String!) {
-  accountById(id: $pubkey) {
+  accountByPk(id: $pubkey) {
     wasIdentity {
       identity {
         name
@@ -57,21 +63,21 @@ query WasIdentityNameByPubkey($pubkey: String!) {
 }
 
 query LatestBlock {
-  blocks(limit: 1, orderBy: height_DESC) {
+  block(limit: 1, orderBy: { height: DESC }) {
     height
     hash
   }
 }
 
 query BlockByNumber($number: Int!) {
-  blocks(where: { height_eq: $number }) {
+  block(where: { height: { _eq: $number } }) {
     height
     hash
   }
 }
 
 query GenesisHash {
-  blocks(where: { height_eq: 0 }) {
+  block(where: { height: { _eq: 0 } }) {
     hash
   }
 }