Remove relay staking handlers after pallet removal (spec 1_020_006)

Staking pallet (index 9), FastUnstake (15), and VoterBagsList (100)
were removed from the relay chain. The relay indexer now only tracks
transfers and signed extrinsics. Added safety try-catch to staking
queries in case handlers are accidentally re-enabled.

src/mappings/NewEra.ts

@@ -30,7 +30,19 @@ export async function handleRelayBlock(block: SubstrateBlock): Promise<void> {
 
   logger.info("Initializing active relay stakers from live chain state...");
 
-  const activeEraOpt = (await api.query.staking.activeEra()) as Option<any>;
+  // Safety: staking pallet was removed from relay chain in spec 1_020_006
+  if (!api.query.staking || !api.query.staking.activeEra) {
+    logger.info("Staking pallet not available on relay chain - skipping relay staker init");
+    return;
+  }
+
+  let activeEraOpt: Option<any>;
+  try {
+    activeEraOpt = (await api.query.staking.activeEra()) as Option<any>;
+  } catch (e) {
+    logger.warn(`Failed to query staking.activeEra on relay: ${e}`);
+    return;
+  }
   if (activeEraOpt.isNone) {
     logger.info("No active era found on relay chain");
     return;
@@ -121,9 +133,21 @@ export async function handleStakersElected(
 }
 
 export async function handleNewEra(event: SubstrateEvent): Promise<void> {
-  const currentEra = ((await api.query.staking.currentEra()) as Option<any>)
-    .unwrap()
-    .toNumber();
+  // Safety: staking pallet was removed from relay chain in spec 1_020_006
+  if (!api.query.staking || !api.query.staking.currentEra) {
+    logger.warn("Staking pallet not available - skipping handleNewEra");
+    return;
+  }
+
+  let currentEra: number;
+  try {
+    currentEra = ((await api.query.staking.currentEra()) as Option<any>)
+      .unwrap()
+      .toNumber();
+  } catch (e) {
+    logger.warn(`Failed to query staking.currentEra: ${e}`);
+    return;
+  }
 
   let validatorExposures: Array<{
     address: string;

src/mappings/PoolStakers.ts

@@ -170,6 +170,20 @@ function calculateYearlyInflation(stakedPortion: number): number {
 }
 
 async function computeAndSaveAPY(): Promise<void> {
+  // Safety: check staking pallet availability before querying
+  if (!api.query.staking || !api.query.staking.activeEra) {
+    logger.warn("Staking pallet not available on this chain - skipping APY computation");
+    return;
+  }
+
+  try {
+    await _computeAndSaveAPYInner();
+  } catch (e) {
+    logger.warn(`APY computation failed: ${e}`);
+  }
+}
+
+async function _computeAndSaveAPYInner(): Promise<void> {
   // Use AH's own totalIssuance. AH staking pallet mints inflation from AH supply.
   const TOTAL_SUPPLY = (
     (await api.query.balances.totalIssuance()) as any