fix: create optimized query to get current cycle signer weight percen…

…tages (#70)

src/pg/pg-store.ts

@@ -756,11 +756,21 @@ export class PgStore extends BasePgStore {
     return dbRewardSetSigners;
   }
 
-  async getCurrentCycleNumber() {
-    const result = await this.sql<{ cycle_number: number }[]>`
-      SELECT MAX(cycle_number) AS cycle_number FROM reward_set_signers
+  async getCurrentCycleSignersWeightPercentage() {
+    return await this.sql<{ signer_key: string; weight: number }[]>`
+      WITH current_cycle AS (
+        SELECT MAX(cycle_number) AS cycle_number
+        FROM reward_set_signers
+      ),
+      total_weight AS (
+        SELECT SUM(signer_weight) AS total
+        FROM reward_set_signers
+        WHERE cycle_number = (SELECT cycle_number FROM current_cycle)
+      )
+      SELECT signer_key, ROUND((signer_weight::numeric / (SELECT total FROM total_weight)::numeric) * 100.0, 3)::float AS weight
+      FROM reward_set_signers
+      WHERE cycle_number = (SELECT cycle_number FROM current_cycle)
     `;
-    return result[0]?.cycle_number;
   }
 
   async getSignerForCycle(cycleNumber: number, signerId: string) {

src/prom-metrics.ts

@@ -74,13 +74,10 @@ export function configureSignerMetrics(db: PgStore) {
     help: 'Signer weight percentage for the current cycle',
     labelNames: ['signer'] as const,
     async collect() {
-      const dbResults = await db.sqlTransaction(async sql => {
-        const cycle = await db.getCurrentCycleNumber();
-        return await db.getSignersForCycle({ sql, cycleNumber: cycle, limit: 60, offset: 0 });
-      });
+      const dbResults = await db.getCurrentCycleSignersWeightPercentage();
       this.reset();
       for (const row of dbResults) {
-        this.set({ signer: row.signer_key }, row.weight_percentage);
+        this.set({ signer: row.signer_key }, row.weight);
       }
     },
   });