Referencing transaction from Snapshot

Author: benesjan

schema.graphql

@@ -123,9 +123,7 @@ type LiquidityPositionSnapshot @entity {
   reserveUSD: BigDecimal! # snapshot of pair reserves in USD
   liquidityTokenTotalSupply: BigDecimal! # snapshot of pool token supply
   liquidityTokenBalance: BigDecimal! # snapshot of users pool token balance
-  tx: Bytes! # txn hash
-  gasUsed: BigInt!
-  gasPrice: BigInt!
+  transaction: Transaction!
 }
 
 type Transaction @entity {

src/mappings/helpers.ts

@@ -189,9 +189,7 @@ export function createLiquiditySnapshot(position: LiquidityPosition, event: Ethe
   snapshot.liquidityTokenTotalSupply = pair.totalSupply
   snapshot.liquidityTokenBalance = position.liquidityTokenBalance
   snapshot.liquidityPosition = position.id
-  snapshot.tx = event.transaction.hash
-  snapshot.gasUsed = event.transaction.gasUsed
-  snapshot.gasPrice = event.transaction.gasPrice
+  snapshot.transaction = event.transaction.hash.toHexString()
   snapshot.save()
   position.save()
 }