diff --git a/package.json b/package.json
index 3c4a7af..e89f7da 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "0xalice-tgram-bot",
-  "version": "0.2.17",
+  "version": "0.2.18",
   "description": "Batched Telegram notification bot for 0xAlice",
   "type": "module",
   "main": "./dist/cjs/index.js",
diff --git a/src/__tests__/batcher.test.ts b/src/__tests__/batcher.test.ts
index 22bcdfd..11ada81 100644
--- a/src/__tests__/batcher.test.ts
+++ b/src/__tests__/batcher.test.ts
@@ -7,6 +7,7 @@ describe('MessageBatcher', () => {
   let batcher: MessageBatcher;
 
   beforeEach(() => {
+    jest.useFakeTimers();
     processedMessages = [];
     mockProcessor = {
       name: 'mock',
@@ -22,6 +23,7 @@ describe('MessageBatcher', () => {
     }
     jest.clearAllMocks();
     jest.clearAllTimers();
+    jest.useRealTimers();
   });
 
   it('should process messages with concurrent processors', async () => {
@@ -170,9 +172,9 @@ describe('MessageBatcher', () => {
     batcher.info('message 1');
     batcher.info('message 2');
 
-    // Wait for processing
-    await new Promise(process.nextTick);
-    await batcher.flush();
+    // Run timers and wait for processing
+    jest.advanceTimersByTime(1000);
+    await Promise.resolve();
 
     expect(processBatchSpy).toHaveBeenCalledWith(
       expect.arrayContaining([
@@ -184,7 +186,7 @@ describe('MessageBatcher', () => {
         }),
       ])
     );
-  }, 10000);
+  });
 
   it('should handle sync processor errors', async () => {
     const errorProcessor = {
@@ -264,7 +266,7 @@ describe('MessageBatcher', () => {
     const slowProcessor = {
       name: 'processor1',
       processBatch: jest.fn().mockImplementation(async () => {
-        await new Promise(resolve => setTimeout(resolve, 50));
+        await Promise.resolve();
       }),
     };
     const fastProcessor = {
diff --git a/src/batcher.ts b/src/batcher.ts
index f577706..67f2f60 100644
--- a/src/batcher.ts
+++ b/src/batcher.ts
@@ -5,12 +5,8 @@ import {
   type MessageProcessor,
   type MessageBatcher,
 } from './types';
-
 // Export for testing
 let globalBatcher: MessageBatcher | null = null;
-const resetGlobalBatcher = () => {
-  globalBatcher = null;
-};
 
 export function createMessageBatcher(
   processors: MessageProcessor[],
@@ -30,6 +26,9 @@ export function createMessageBatcher(
   const maxWaitMs = config.maxWaitMs ?? 60_000; // 1 minute
 
   function startProcessing(): void {
+    if (processInterval) {
+      clearInterval(processInterval);
+    }
     processInterval = setInterval(async () => {
       for (const chatId of queues.keys()) {
         await processBatch(chatId);
@@ -47,8 +46,10 @@ export function createMessageBatcher(
   }
 
   function removeAllExtraProcessors(): void {
+    for (const processor of extraProcessors) {
+      removeExtraProcessor(processor);
+    }
     extraProcessors = [];
-    // processorNames.clear();
   }
 
   function removeExtraProcessor(processor: MessageProcessor): void {
@@ -161,10 +162,8 @@ export function createMessageBatcher(
     queues.set(chatId, []);
 
     const allProcessors = [...processors, ...extraProcessors];
-    await concurrentExhaust(
-      allProcessors,
-      concurrentProcessors,
-      (processor) => exhaustProcessor(processor, batch)
+    await concurrentExhaust(allProcessors, concurrentProcessors, (processor) =>
+      exhaustProcessor(processor, batch)
     );
   }
 
@@ -218,6 +217,7 @@ export function createMessageBatcher(
     globalBatcher = null;
   }
 
+  // Initialize processing
   startProcessing();
 
   globalBatcher = {
@@ -233,6 +233,8 @@ export function createMessageBatcher(
     timers,
     addExtraProcessor,
     removeExtraProcessor,
+    removeAllExtraProcessors,
   };
+
   return globalBatcher;
 }
diff --git a/src/types.ts b/src/types.ts
index 6747ef2..114e959 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,5 +1,12 @@
 export type NotificationLevel = 'info' | 'warning' | 'error';
 
+// Predefined severity levels with option for custom strings
+export type SeverityLevel =
+  | 'low'
+  | 'medium'
+  | 'high'
+  | (string & NonNullable<unknown>);
+
 export type Message = {
   chatId: string;
   text: string;
@@ -39,6 +46,7 @@ export interface MessageBatcher {
   timers: Map<string, NodeJS.Timeout>;
   addExtraProcessor(processor: MessageProcessor): void;
   removeExtraProcessor(processor: MessageProcessor): void;
+  removeAllExtraProcessors(): void;
 }
 
 export type ProcessorOptions = {
diff --git a/src/utils/errorClassifier.ts b/src/utils/errorClassifier.ts
index 46dfe3a..3a395d5 100644
--- a/src/utils/errorClassifier.ts
+++ b/src/utils/errorClassifier.ts
@@ -1,3 +1,5 @@
+import { SeverityLevel } from "../types";
+
 // Define the named object interface
 export type ErrorPatternConfig = {
   name: string;
@@ -7,7 +9,7 @@ export type ErrorPatternConfig = {
     | Promise<boolean>
     | ((message: string) => Promise<boolean>);
   category: string;
-  severity: 'low' | 'medium' | 'high';
+  severity: SeverityLevel;
   aggregation?: {
     windowMs: number;
     countThreshold: number;
@@ -23,7 +25,7 @@ type ErrorPattern = readonly [
     | ((message: string) => Promise<boolean>)
   ),
   string, // category
-  'low' | 'medium' | 'high', // severity
+  SeverityLevel, // severity
   [number, number]? // [windowMs, countThreshold] for aggregation
 ];
 
@@ -68,7 +70,7 @@ const DEFAULT_ERROR_PATTERNS: ErrorPatternConfig[] = [
 // Store custom patterns
 let customPatterns: ErrorPattern[] = [];
 
-export function addErrorPatterns(patterns: ErrorPatternConfig[]): void {
+export function addErrorPatterns(patterns: readonly ErrorPatternConfig[]): void {
   customPatterns = customPatterns.concat(patterns.map(configToPattern));
 }
 
@@ -95,7 +97,7 @@ const errorTracker = new Map<
 type ClassifiedError = readonly [
   string, // originalMessage
   string, // category
-  'low' | 'medium' | 'high', // severity
+  SeverityLevel, // severity
   string[], // details (key-value pairs flattened)
   boolean, // isAggregated
   number?, // occurrences