diff --git a/api/src/db/schema.ts b/api/src/db/schema.ts
index 5907d41..922d49f 100644
--- a/api/src/db/schema.ts
+++ b/api/src/db/schema.ts
@@ -6,24 +6,24 @@ export const attraction = sqliteTable('attraction', {
     id: integer().primaryKey({ autoIncrement: true }),
     name: text().notNull(),
     apiCode: text('api_code').notNull().unique(),
-    themeparkId: integer('themepark_id').notNull().references(() => themepark.id, {onDelete: 'cascade'})
+    themeparkId: integer('themepark_id').notNull().references(() => themepark.id)
 }, (t) => [
     unique().on(t.apiCode, t.themeparkId)
 ])
 
 export const attractionNotification = sqliteTable('attraction_notification', {
     id: integer().primaryKey({ autoIncrement: true}),
-    userId: integer('user_id').notNull().references(() => user.id, {onDelete: 'cascade'}),
-    attractionId: integer('attraction_id').notNull().references(() => attraction.id, {onDelete: 'cascade'}),
-    notificationMethodId: integer('notification_method_id').notNull().references(() => notificationMethod.id, {onDelete: 'cascade'})
+    userId: integer('user_id').notNull().references(() => user.id),
+    attractionId: integer('attraction_id').notNull().references(() => attraction.id),
+    notificationMethodId: integer('notification_method_id').notNull().references(() => notificationMethod.id)
 }, (t) => [
     unique().on(t.userId, t.attractionId, t.notificationMethodId)
 ])
 
 export const logbook = sqliteTable('logbook', {
     id: integer().primaryKey({ autoIncrement: true }),
-    userId: integer('user_id').notNull().references(() => user.id, {onDelete: 'cascade'}),
-    attractionId: integer('attraction_id').notNull().references(() => attraction.id, {onDelete: 'cascade'}),
+    userId: integer('user_id').notNull().references(() => user.id),
+    attractionId: integer('attraction_id').notNull().references(() => attraction.id),
     timestamp: integer().notNull(), // unix timecode
     expectedWaittime: integer(),
     realWaittime: integer()
@@ -35,8 +35,8 @@ export const notificationMethod = sqliteTable('notification_method', {
     id: integer().primaryKey({ autoIncrement: true }),
     webhookUrl: text('webhook_url').notNull(),
     shownName: text().notNull(),
-    userId: integer('user_id').notNull().references(() => user.id, {onDelete: 'cascade'}),
-    notificationProviderId: integer('notification_provider_id').notNull().references(() => notificationProvider.id, {onDelete: 'cascade'}),
+    userId: integer('user_id').notNull().references(() => user.id),
+    notificationProviderId: integer('notification_provider_id').notNull().references(() => notificationProvider.id),
 }, (t) => [
     unique().on(t.webhookUrl, t.userId, t.notificationProviderId)
 ])
diff --git a/api/src/errors/http-error.ts b/api/src/errors/http-error.ts
index 17d20be..ed9eea3 100644
--- a/api/src/errors/http-error.ts
+++ b/api/src/errors/http-error.ts
@@ -28,7 +28,7 @@ export class InvalidParameter extends HTTPException{
         super(400, { message:
             paramName
             ? `Provided parameter '${paramName}' is invalid.`
-            : 'Provided invalid request parameter(s) or some required parameter is missing.'
+            : 'Provided invalid parameter.'
         })
     }
 }
diff --git a/api/src/index.ts b/api/src/index.ts
index 5d5a858..b284adf 100644
--- a/api/src/index.ts
+++ b/api/src/index.ts
@@ -6,7 +6,6 @@ import attraction from './routes/attraction'
 import notification from './routes/notification-method'
 import logbook from './routes/logbook'
 import themepark from './routes/themepark'
-import user from './routes/user'
 import cronRouter from './jobs/cron'
 
 // create app
@@ -38,7 +37,6 @@ app.route('/attraction', attraction)
 app.route('/notification-method', notification)
 app.route('/logbook', logbook)
 app.route('/themepark', themepark)
-app.route('/user', user)
 export default {
     fetch: app.fetch,
     scheduled: cronRouter,
diff --git a/api/src/lib/cache.ts b/api/src/lib/cache.ts
index b631337..33124ce 100644
--- a/api/src/lib/cache.ts
+++ b/api/src/lib/cache.ts
@@ -1,17 +1,9 @@
 import { cache } from 'hono/cache'
 
 /**
- * Cache unit to use for multiple endpoints as needed (TTL: 86400s)
+ * Cache unit to use for multiple endpoints as needed
  */
 export const responseCache = cache({
     cacheName: 'themepark-assistant',
     cacheControl: 'max-age=86400'
-});
-
-/**
- * Cache for dynamic data (TTL: 30s)
- */
-export const dynamicCache = cache({
-    cacheName: 'themepark-assistant-dynamic',
-    cacheControl: 'max-age=30s'
 });
\ No newline at end of file
diff --git a/api/src/lib/http-z-validator.ts b/api/src/lib/http-z-validator.ts
index ee9a787..3308ffe 100644
--- a/api/src/lib/http-z-validator.ts
+++ b/api/src/lib/http-z-validator.ts
@@ -8,23 +8,8 @@ import { InvalidParameter } from '../errors'
  * @param schema Zod Validation scheme (docs: https://zod.dev/api)
  * @returns zValidator for running the validation
  */
-export function httpZValidator<T extends z.ZodTypeAny>(type: 'query' | 'json' | 'param' = 'query', schema: T){
+export default function httpZValidator<T extends z.ZodTypeAny>(type: 'query' | 'json' | 'param' = 'query', schema: T){
     return zValidator(type, schema, (result, c) => {
         if(!result.success) throw new InvalidParameter();
     })
-}
-
-// Predefined validators
-/**
- * Validates if id is a number (using zod)
- */
-export const idValidator = httpZValidator('param', z.strictObject({
-  id: z.coerce.number()
-}));
-
-/**
- * Validates if notificationMethodId is number (using zod)
- */
-export const notificationMethodIdValidator = httpZValidator('query', z.strictObject({
-  notificationMethodId: z.coerce.number()
-}));
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/api/src/routes/attraction.ts b/api/src/routes/attraction.ts
index 8e95071..a9f2a02 100644
--- a/api/src/routes/attraction.ts
+++ b/api/src/routes/attraction.ts
@@ -1,4 +1,4 @@
-import { Hono } from 'hono'
+import { Hono, Context } from 'hono'
 import { getDbContext } from '../db/client'
 import { attractionNotification } from '../db/schema'
 import { and, eq } from 'drizzle-orm'
@@ -6,14 +6,19 @@ import { DatabaseError, InvalidParameter, MissingParameter } from '../errors'
 import { getUser } from '../lib/user-auth'
 import { Message } from '../types/response'
 import { getNotificationMethodOwner } from '../lib/check-notification-method-owner'
-import { httpZValidator, idValidator, notificationMethodIdValidator } from '../lib/http-z-validator'
-import * as z from 'zod'
 
 const app = new Hono()
 
-
-
-
+/**
+ * Checks if request has notificationMethodId parameter
+ * @param c Request context
+ * @returns if available notificationMethodId, else undefined
+ */
+function getNotificationMethodId(c: Context): number | undefined{
+    const str = c.req.query('notificationMethodId');
+    if(!str) return undefined;
+    return parseInt(str);
+}
 
 /**
  * Checks if drizzle db error has a message cause
@@ -32,12 +37,13 @@ function hasMessageCause(e: unknown): e is Error & { cause: { message: string }}
 /**
  * Subscribe to waittime notifications from a specified attraction
  */
-app.post('/:id/subscribe', idValidator, notificationMethodIdValidator, async (c) => {
-    const attractionId = c.req.valid('param').id;
+app.post('/:id/subscribe', async (c) => {
+    const attractionId = parseInt(c.req.param('id'));
     const db = getDbContext(c)
     const user = await getUser(c);
 
-    const notificationMethodId = c.req.valid('query').notificationMethodId;
+    const notificationMethodId = getNotificationMethodId(c);
+    if(!notificationMethodId) throw new MissingParameter('notificationMethodId');
 
     const method = await getNotificationMethodOwner(db, notificationMethodId, user.id);
 
@@ -67,12 +73,12 @@ app.post('/:id/subscribe', idValidator, notificationMethodIdValidator, async (c)
 /**
  * Unsubscribe to waittime notifications from a specified attraction
  */
-app.post('/:id/unsubscribe', idValidator, notificationMethodIdValidator, async (c) => {
-    const attractionId = c.req.valid('param').id;
+app.post('/:id/unsubscribe', async (c) => {
+    const attractionId = parseInt(c.req.param('id'));
     const db = getDbContext(c)
     const user = await getUser(c);
 
-    const notificationMethodId = c.req.valid('query').notificationMethodId;
+    const notificationMethodId = getNotificationMethodId(c);
     const methodOwner = notificationMethodId ? await getNotificationMethodOwner(db, notificationMethodId, user.id): false;
 
     const queryConditions = [
diff --git a/api/src/routes/logbook.ts b/api/src/routes/logbook.ts
index 6edf27c..fa36f1e 100644
--- a/api/src/routes/logbook.ts
+++ b/api/src/routes/logbook.ts
@@ -1,150 +1,13 @@
 import { Hono } from 'hono'
-import { DatabaseError } from '../errors'
-import { getDbContext } from '../db/client'
-import { logbook } from '../db/schema'
-import { and, eq } from 'drizzle-orm'
-import { getUser } from '../lib/user-auth'
-import { Message } from '../types/response'
-import { httpZValidator } from '../lib/http-z-validator'
-import * as z from 'zod'
 
 const app = new Hono()
 
-/**
- * Lists all logbook entries of the logged in user
- */
-app.get('/list', async (c) => {
-  const db = getDbContext(c);
-  const user = await getUser(c);
-
-  try{
-    const logbookEntries = await db.select({
-      entryId: logbook.id,
-      attractionId: logbook.attractionId,
-      timestamp: logbook.timestamp,
-      expectedWaittime: logbook.expectedWaittime,
-      realWaittime: logbook.realWaittime
-    }).from(logbook)
-    .where(eq(logbook.userId, user.id));
-
-    return c.json(logbookEntries);
-  }
-  catch{
-    throw new DatabaseError();
-  }
-})
-
-/**
- * Adds new entry to the logbook of the current user
- */
-app.post('/add-entry', httpZValidator('query', z.strictObject({
-  attractionId: z.coerce.number(),
-  timestamp: z.coerce.number().min(0).positive(),
-  expectedWaittime: z.coerce.number().optional(),
-  realWaittime: z.coerce.number().optional()
-})),
-async (c) => {
-  const db = getDbContext(c);
-  const user = await getUser(c);
-
-  const params = c.req.valid('query');
-
-  try{
-    const res = await db.insert(logbook).values({
-      userId: user.id,
-      attractionId: params.attractionId,
-      timestamp: params.timestamp,
-      expectedWaittime: params.expectedWaittime,
-      realWaittime: params.realWaittime
-    }).onConflictDoNothing().returning();
-
-    const newEntry = res[0];
-
-    const message = res.length > 0
-    ? 'Added new entry to logbook.'
-    : 'Entry already exists. No changes made.';
-
-    return c.json(new Message(message, {
-      entryId: newEntry.id,
-      attractionId: newEntry.attractionId,
-      timestamp: newEntry.timestamp,
-      expectedWaittime: newEntry.expectedWaittime,
-      realWaittime: newEntry.realWaittime
-    }));
-  }
-  catch{
-    throw new DatabaseError();
-  }
-})
-
-/**
- * Updates waittime information of specified entry (by entryId)
- */
-app.put('update-entry', httpZValidator('query', z.strictObject({
-  entryId: z.coerce.number(),
-  expectedWaittime: z.coerce.number().optional(),
-  realWaittime: z.coerce.number().optional()
-}).refine((data) => data.expectedWaittime || data.realWaittime)),
-async (c) => {
-  const db = getDbContext(c);
-  const user = await getUser(c);
-  const params = c.req.valid('query');
-
-  try{
-    const res = await db.update(logbook).set({
-      expectedWaittime: params.expectedWaittime,
-      realWaittime: params.realWaittime
-    }).where(and(
-      eq(logbook.userId, user.id),
-      eq(logbook.id, params.entryId)
-    )).returning();
-
-    const modifiedEntry = res[0];
-
-    return c.json(res.length > 0
-      ? new Message('Updated logbook entry.', {
-      entryId: modifiedEntry.id,
-      attractionId: modifiedEntry.attractionId,
-      timestamp: modifiedEntry.timestamp,
-      expectedWaittime: modifiedEntry.expectedWaittime,
-      realWaittime: modifiedEntry.realWaittime
-    })
-    : new Message('Requested entry does not exist. No changes made.')
-    );
-  }
-  catch{
-    throw new DatabaseError();
-  }
-})
-
-/**
- * Removes specified logbook entry by entryId
- */
-app.delete('remove-entry', httpZValidator('query', z.strictObject({
-  entryId: z.coerce.number()
-})),
-async (c) => {
-  const db = getDbContext(c);
-  const user = await getUser(c);
-  const params = c.req.valid('query');
-
-  try{
-    const res = await db.delete(logbook).where(
-      and(
-        eq(logbook.userId, user.id),
-        eq(logbook.id, params.entryId)
-      )
-    ).returning();
-
-    const message = res.length > 0
-    ? `Logbook entry with id ${params.entryId} was removed.`
-    : `No logbook entry with id ${params.entryId} found. No changes made.`;
-
-    return c.json(new Message(message));
-  }
-  catch{
-    throw new DatabaseError();
-  }
+app.get('/list', (c) => {
+  return c.json(
+    {
+      message: 'List all logbook entries'
+    }
+  )
 })
 
 export default app
\ No newline at end of file
diff --git a/api/src/routes/notification-method.ts b/api/src/routes/notification-method.ts
index a735af3..7dde507 100644
--- a/api/src/routes/notification-method.ts
+++ b/api/src/routes/notification-method.ts
@@ -5,9 +5,6 @@ import { eq, and } from 'drizzle-orm'
 import { getUser } from '../lib/user-auth'
 import { DatabaseError, InvalidParameter, MissingParameter } from '../errors'
 import { Message } from '../types/response'
-import { responseCache, dynamicCache } from '../lib/cache'
-import { httpZValidator, idValidator } from '../lib/http-z-validator'
-import * as z from 'zod'
 
 const app = new Hono()
 
@@ -54,7 +51,7 @@ app.get('/list', async (c) => {
 })
 
 /** Lists all available notification providers */
-app.get('/list-providers', responseCache, async (c) => {
+app.get('/list-providers', async (c) => {
   const db = getDbContext(c);
 
   try{
@@ -71,24 +68,21 @@ app.get('/list-providers', responseCache, async (c) => {
 })
 
 /** Creates a new notification method from url, name & provider */
-app.post('/add-method', httpZValidator('query', z.strictObject({
-  url: z.string(),
-  name: z.string(),
-  provider: z.string()
-})),
-async (c) => {
+app.post('/add-method', async (c) => {
   const db = getDbContext(c);
   const user = await getUser(c);
 
-  const params = c.req.valid('query');
+  const { url, name, provider } = c.req.query();
 
-  const providerId = await getProviderId(db, params.provider);
+  if(!url || !name || !provider) throw new MissingParameter();
+
+  const providerId = await getProviderId(db, provider);
   if(!providerId) throw new InvalidParameter('provider');
 
   try{
     const newMethod = await db.insert(notificationMethod).values({
-      webhookUrl: params.url,
-      shownName: params.name,
+      webhookUrl: url,
+      shownName: name,
       userId: user.id,
       notificationProviderId: providerId
     }).returning().onConflictDoNothing().get();
@@ -109,10 +103,12 @@ async (c) => {
 })
 
 /** Removes a existing notification method by id (has to be owned by the current user) */
-app.delete('/remove-method/:id', idValidator, async (c) => {
+app.delete('/remove-method/:id', async (c) => {
   const db = getDbContext(c);
   const user = await getUser(c);
-  const methodId = c.req.valid('param').id;
+  const methodId = parseInt(c.req.param('id'));
+
+  if(!methodId) throw new InvalidParameter('id');
 
   try{
     const res = await db.delete(notificationMethod).where(
diff --git a/api/src/routes/themepark.ts b/api/src/routes/themepark.ts
index ae2e7df..7bd89b9 100644
--- a/api/src/routes/themepark.ts
+++ b/api/src/routes/themepark.ts
@@ -4,7 +4,6 @@ import { themepark, attraction } from '../db/schema'
 import { responseCache } from '../lib/cache'
 import { eq } from 'drizzle-orm'
 import { DatabaseError } from '../errors'
-import { idValidator } from '../lib/http-z-validator'
 
 const app = new Hono()
 
@@ -31,8 +30,8 @@ app.get('/list', responseCache, async (c) => {
 /**
  * Lists all attractions from a themepark with their id & name
  */
-app.get('/list/:id/attraction', responseCache, idValidator, async (c) => {
-    const parkId = c.req.valid('param').id;
+app.get('/list/:id/attraction', responseCache, async (c) => {
+    const parkId = parseInt(c.req.param('id'));
     const db = getDbContext(c)
 
     try{
diff --git a/api/src/routes/user.ts b/api/src/routes/user.ts
deleted file mode 100644
index a6975a5..0000000
--- a/api/src/routes/user.ts
+++ /dev/null
@@ -1,44 +0,0 @@
-import { Hono } from 'hono'
-import { DatabaseError } from '../errors'
-import { getDbContext } from '../db/client'
-import { getUser } from '../lib/user-auth'
-import { user } from '../db/schema'
-import { eq } from 'drizzle-orm'
-import { Message } from '../types/response'
-import { httpZValidator } from '../lib/http-z-validator'
-import * as z from 'zod'
-
-const app = new Hono()
-
-/**
- * Deletes user account with all associated data (requires parameter 'confirm' to be true)
- * Be careful when using (once your data is delete it cannot be restored)
- */
-app.delete('delete-account', httpZValidator('query', z.strictObject({
-  confirm: z.literal('true') // to prevent unwanted account deletion when hitting the endpoint unintentionally
-})),
-async (c) => {
-  const db = getDbContext(c);
-  const currentUser = await getUser(c);
-  const params = c.req.valid('query');
-
-  try{
-    const res = await db.delete(user).where(
-        eq(user.id, currentUser.id)
-    ).returning();
-
-    const deletedUser = res[0];
-
-    const message = res.length > 0
-    ? `User account ${deletedUser.mail} with all associated data deleted.`
-    : 'User account does not exist. No changes made.';
-
-    return c.json(new Message(message));
-  }
-  catch(e){
-    console.error(e);
-    throw new DatabaseError();
-  }
-})
-
-export default app
\ No newline at end of file