fix(backend): resolve ESLint errors from #1278

- Remove duplicate MemoryCache class fragment in redis.ts and use
  unknown instead of any
- Drop unused rateLimit import in stream-rate-limiter middleware
- Remove dup cancel route registration left by merge and drop as any
- Fix broken ternary leftover in soroban-event-worker
- Pin prisma's mysql2 dep via override and sync package-lock

Generated with Codebuff 🤖
Co-Authored-By: Codebuff <noreply@codebuff.com>

Author: Blessed-Femi

backend/src/lib/redis.ts

@@ -24,8 +24,6 @@ interface CacheItem<T> {
   createdAt: number;
 }
 
-class MemoryCache {
-  private cache = new Map<string, CacheItem<unknown>>();
 interface MemoryCacheOptions {
   /**
    * Hard cap on the number of entries kept in memory. When exceeded, the
@@ -43,7 +41,7 @@ const DEFAULT_MEMORY_CACHE_MAX_ITEMS = 10_000;
  * memory usage stays bounded regardless of key churn or sweep interval.
  */
 export class MemoryCache {
-  private cache = new Map<string, CacheItem<any>>();
+  private cache = new Map<string, CacheItem<unknown>>();
   private hits = 0;
   private misses = 0;
   private readonly maxItems: number;
@@ -72,12 +70,11 @@ export class MemoryCache {
       return null;
     }
     this.hits++;
-    return item.value as T;
     // Refresh LRU recency: re-insert at the end of the Map so this entry is
     // the last candidate for eviction when the max-size cap is hit.
     this.cache.delete(key);
     this.cache.set(key, item);
-    return item.value;
+    return item.value as T;
   }
 
   set<T>(key: string, value: T, ttlSeconds: number): void {

backend/src/middleware/stream-rate-limiter.middleware.ts

@@ -1,4 +1,4 @@
-import { rateLimit, type Options } from 'express-rate-limit';
+import { type Options } from 'express-rate-limit';
 import { createRateLimiter } from './rate-limiter.middleware.js';
 import { type Request, type Response, type NextFunction } from 'express';
 import type { AuthenticatedRequest } from '../types/auth.types.js';

backend/src/routes/v1/stream.routes.ts

@@ -656,7 +656,6 @@ router.post('/:streamId/withdraw', requireAuth, withdrawHandler);
  *               $ref: '#/components/schemas/Error'
  */
 router.post('/:streamId/top-up', requireAuth, topUpStreamHandler);
-router.post('/:streamId/cancel', requireAuth, cancelStreamHandler);
 
 /**
  * @openapi
@@ -719,6 +718,6 @@ router.post('/:streamId/cancel', requireAuth, cancelStreamHandler);
  *             schema:
  *               $ref: '#/components/schemas/Error'
  */
-router.post('/:streamId/cancel', requireAuth, cancelStreamHandler as any);
+router.post('/:streamId/cancel', requireAuth, cancelStreamHandler);
 
 export default router;

backend/src/workers/soroban-event-worker.ts

@@ -396,7 +396,6 @@ export class SorobanEventWorker {
     const finalCursor = hasError
       ? lastCursor
       : ((response as { latestCursor?: string }).latestCursor || lastCursor);
-      : (response as any).latestCursor || lastCursor;
 
     await prisma.indexerState.upsert({
       where: { id: INDEXER_STATE_ID },

package-lock.json

@@ -42,6 +42,9 @@
     "sharp": "^0.35.0",
     "deepmerge-ts": "^8.0.0",
     "react": "19.2.7",
-    "react-dom": "19.2.7"
+    "react-dom": "19.2.7",
+    "prisma": {
+      "mysql2": "^3.22.0"
+    }
   }
 }