diff --git a/core/src/validation/index.ts b/core/src/validation/index.ts
deleted file mode 100644
index b00a2f926..000000000
--- a/core/src/validation/index.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-import { LOG4JS_BASE_CATEGORY_NAME } from '../config/const'
-
-export const LOG4JS_CATEGORY_SCHEMA_ALIAS = `${LOG4JS_BASE_CATEGORY_NAME}.schema`
diff --git a/core/src/validation/user.test.ts b/core/src/validation/user.test.ts
index 4cfc76a7c..cd3bd1925 100644
--- a/core/src/validation/user.test.ts
+++ b/core/src/validation/user.test.ts
@@ -1,10 +1,10 @@
-import { LOG4JS_CATEGORY_SCHEMA_ALIAS } from '.'
 import { validateAlias } from './user'
-import { getLogger, printLogs } from '../../../config-schema/test/testSetup.bun'
+import { getLogger } from '../../../config-schema/test/testSetup.bun'
 import { describe, it, expect, beforeEach, mock, jest } from 'bun:test'
 import { aliasExists } from 'database'
+import { LOG4JS_BASE_CATEGORY_NAME } from '../config/const'
 
-const logger = getLogger(`${LOG4JS_CATEGORY_SCHEMA_ALIAS}.alias`)
+const logger = getLogger(`${LOG4JS_BASE_CATEGORY_NAME}.validation.user`)
 
 mock.module('database', () => ({
   aliasExists: jest.fn(),
diff --git a/core/src/validation/user.ts b/core/src/validation/user.ts
index b188e5d54..eebc34442 100644
--- a/core/src/validation/user.ts
+++ b/core/src/validation/user.ts
@@ -1,10 +1,10 @@
 import { ZodError } from 'zod'
 import { getLogger } from 'log4js'
-import { LOG4JS_CATEGORY_SCHEMA_ALIAS } from '.'
+import { LOG4JS_BASE_CATEGORY_NAME } from '../config/const'
 import { aliasExists } from 'database'
 import { aliasSchema } from 'shared'
 
-const logger = getLogger(`${LOG4JS_CATEGORY_SCHEMA_ALIAS}.alias`)
+const logger = getLogger(`${LOG4JS_BASE_CATEGORY_NAME}.validation.user`)
 
 export async function validateAlias(alias: string): Promise<true> {
   try {
diff --git a/shared/src/logic/decay.test.ts b/shared/src/logic/decay.test.ts
index 1db94c4fe..7678c945b 100644
--- a/shared/src/logic/decay.test.ts
+++ b/shared/src/logic/decay.test.ts
@@ -41,4 +41,13 @@ describe('utils/decay', () => {
     const now = new Date()
     expect(calculateDecay(new Decimal(100.0), now, now).balance.toString()).toBe('100')
   })
+
+  describe('calculateDecay called with invalid dates', () => {
+    it('throws an error when to is before from', () => {
+      const now = new Date()
+      const oneSecondAgo = new Date(now.getTime())
+      oneSecondAgo.setSeconds(0)
+      expect(() => calculateDecay(new Decimal(1.0), now, oneSecondAgo)).toThrowError()
+    })
+  })
 })
diff --git a/shared/src/logic/decay.ts b/shared/src/logic/decay.ts
index f75146515..35ab99803 100644
--- a/shared/src/logic/decay.ts
+++ b/shared/src/logic/decay.ts
@@ -1,11 +1,7 @@
 import { Decimal } from 'decimal.js-light'
 
-import { getLogger } from 'log4js'
-import { LOG4JS_LOGIC_CATEGORY } from '.'
 import { DECAY_START_TIME } from '../const'
 
-const logger = getLogger(`${LOG4JS_LOGIC_CATEGORY}.DecayLogic`)
-
 Decimal.set({
   precision: 25,
   rounding: Decimal.ROUND_HALF_UP,
@@ -40,7 +36,7 @@ export function calculateDecay(
   const startBlockMs = DECAY_START_TIME.getTime()
 
   if (toMs < fromMs) {
-    logger.error('calculateDecay: to < from, reverse decay calculation is invalid', from, to)
+    // TODO: refactor, use custom Error Classes which contain context variables
     throw new Error('calculateDecay: to < from, reverse decay calculation is invalid')
   }
 
diff --git a/shared/src/logic/index.ts b/shared/src/logic/index.ts
deleted file mode 100644
index fca61a4b1..000000000
--- a/shared/src/logic/index.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-import { LOG4JS_BASE_CATEGORY_NAME } from '../const'
-
-export const LOG4JS_LOGIC_CATEGORY = `${LOG4JS_BASE_CATEGORY_NAME}.logic`