fix(report): continue to use epochStartHeight for report naming conve…

…ntion to avoid collisions. This is to be consistent with previous naming conventions for report filenames, but it is important to note the epochStartHeight is provided by the contract for the epoch and not computed by the observer

src/store/fs-report-store.ts

@@ -18,12 +18,10 @@
 import fs from 'node:fs';
 import * as winston from 'winston';
 
-import {
-  ObserverReport,
-  ReportInfo,
-  ReportSink,
-  ReportStore,
-} from '../types.js';
+
+
+import { ObserverReport, ReportInfo, ReportSink, ReportStore } from '../types.js';
+
 
 export class FsReportStore implements ReportSink, ReportStore {
   // Dependencies
@@ -44,9 +42,10 @@ export class FsReportStore implements ReportSink, ReportStore {
     const log = this.log.child({
       epochStartTimestamp: report.epochStartTimestamp,
       epochIndex: report.epochIndex,
+      epochStartHeight: report.epochStartHeight,
     });
 
-    const savedReport = await this.getReport(report.epochIndex);
+    const savedReport = await this.getReport(report.epochStartHeight);
     if (savedReport !== null) {
       log.info('Using previously saved report');
       report = savedReport;
@@ -56,13 +55,13 @@ export class FsReportStore implements ReportSink, ReportStore {
       };
     }
 
-    const reportFile = `${this.baseDir}/${report.epochIndex}.json`;
+    const reportFile = `${this.baseDir}/${report.epochStartHeight}.json`;
     log.info('Saving report...', {
       reportFile,
     });
     if (!fs.existsSync(reportFile)) {
       await fs.promises.writeFile(
-        `./data/reports/${report.epochIndex}.json`,
+        `./data/reports/${report.epochStartHeight}.json`,
         JSON.stringify(report),
       );
     }
@@ -73,8 +72,8 @@ export class FsReportStore implements ReportSink, ReportStore {
     return reportInfo;
   }
 
-  async getReport(epochIndex: number): Promise<ObserverReport | null> {
-    const reportFile = `./data/reports/${epochIndex}.json`;
+  async getReport(epochStartHeight: number): Promise<ObserverReport | null> {
+    const reportFile = `./data/reports/${epochStartHeight}.json`;
     if (!fs.existsSync(reportFile)) {
       return null;
     }