Setup DoS protection on graphql node

package.json

@@ -6,7 +6,7 @@
   "author": "",
   "license": "ISC",
   "scripts": {
-    "api:start": "squid-graphql-server --subscriptions",
+    "api:start": "squid-graphql-server --subscriptions --max-root-fields 50 --max-response-size 5000",
     "api:stop": "./scripts/deploy/api.sh stop",
     "archive:start": "./scripts/deploy/archive.sh local up",
     "archive:stop": "./scripts/deploy/archive.sh local down",

schema.graphql

@@ -2,11 +2,11 @@
 A type that has ss58 address format of the account. As soon as the chain
 encounters any new address, they get registered here as user/pool/market account.
 """
-type Account @entity {
+type Account @entity @cardinality(value: 500) {
   "Account address"
   accountId: String!
   "List of balances connected to the account"
-  balances: [AccountBalance]! @derivedFrom(field: "account")
+  balances: [AccountBalance]! @derivedFrom(field: "account") @cardinality(value: 100)
   "Unique identifier of the object"
   id: ID!
   "Zeitgeist's identifier for market. Valid only for market account."
@@ -16,9 +16,9 @@ type Account @entity {
 """
 Balance of a particular asset denoted by assetId present in the account
 """
-type AccountBalance @entity {
+type AccountBalance @entity @cardinality(value: 500) {
   "Connected account"
-  account: Account!
+  account: Account! @cardinality(value: 1)
   "Zeitgeist's identifier for asset"
   assetId: String!
   "Balance of the asset"
@@ -31,7 +31,7 @@ type AccountBalance @entity {
 Balance history of a particular asset in an account. Records all transactions
 associated with the account.
 """
-type HistoricalAccountBalance @entity {
+type HistoricalAccountBalance @entity @cardinality(value: 500) {
   "Account address"
   accountId: String! @index
   "Zeitgeist's identifier for asset"
@@ -54,13 +54,13 @@ type HistoricalAccountBalance @entity {
 A type that has detail of the outcome asset. It is initialised as soon as the
 market is created and price is assigned when pool is deployed for the market.
 """
-type Asset @entity {
+type Asset @entity @cardinality(value: 500) {
   "Unique identifier of the object"
   id: ID!
   "Zeitgeist's identifier for asset"
   assetId: String!
   "Connected pool"
-  pool: Pool!
+  pool: Pool! @cardinality(value: 1)
   "Spot price of the asset in the pool"
   price: Float!
   "Balance of the asset present in the pool account"
@@ -70,7 +70,7 @@ type Asset @entity {
 """
 A type that records the price history of an outcome asset.
 """
-type HistoricalAsset @entity {
+type HistoricalAsset @entity @cardinality(value: 500) {
   "Unique identifier of the object"
   id: ID!
   "Account which executed the trade"
@@ -98,7 +98,7 @@ type HistoricalAsset @entity {
 """
 A type that records the trade history of an account.
 """
-type HistoricalSwap @entity {
+type HistoricalSwap @entity @cardinality(value: 500) {
   "Unique identifier of the object"
   id: ID!
   "Account which executed the trade"
@@ -122,7 +122,7 @@ type HistoricalSwap @entity {
 """
 Prediction market details
 """
-type Market @entity {
+type Market @entity @cardinality(value: 500) {
   "Address responsible for authorizing disputes. Null if Adv Comm is the authority"
   authorizedAddress: String
   "The base asset in the market swap pool (usually a currency)"
@@ -164,7 +164,7 @@ type Market @entity {
   "Time period expressed in block numbers or timestamps"
   period: MarketPeriod!
   "Market's liquidity pool details"
-  pool: Pool
+  pool: Pool @cardinality(value: 1)
   "Reasoning for market rejection"
   rejectReason: String
   "Reported outcome of the market. Null if the market is not reported yet"
@@ -189,7 +189,7 @@ type Market @entity {
 Market history of a particular market. Records all transactions
 associated with the market.
 """
-type HistoricalMarket @entity {
+type HistoricalMarket @entity @cardinality(value: 500) {
   "Height of the block"
   blockNumber: Int!
   "The account that reported or disputed"
@@ -213,11 +213,11 @@ type HistoricalMarket @entity {
 """
 Liquidity pool details
 """
-type Pool @entity {
+type Pool @entity @cardinality(value: 500) {
   "Account for the pool"
-  account: Account!
+  account: Account! @cardinality(value: 1)
   "List of assets connected to the pool"
-  assets: [Asset]! @derivedFrom(field: "pool")
+  assets: [Asset]! @derivedFrom(field: "pool") @cardinality(value: 20)
   "The base asset in the market swap pool (usually a currency)"
   baseAsset: String!
   "Amount of market's base asset present in the pool"
@@ -248,7 +248,7 @@ type Pool @entity {
 Liquidity history of a particular pool. Records all transactions
 associated with the pool.
 """
-type HistoricalPool @entity {
+type HistoricalPool @entity @cardinality(value: 500) {
   "New amount of market's base asset present in the pool"
   baseAssetQty: BigInt
   "Height of the block"