diff --git a/dbal/development/src/core/entities/operations/core/workflow-operations.ts b/dbal/development/src/core/entities/operations/core/workflow-operations.ts
index daaddf21c..497f9b5bd 100644
--- a/dbal/development/src/core/entities/operations/core/workflow-operations.ts
+++ b/dbal/development/src/core/entities/operations/core/workflow-operations.ts
@@ -25,14 +25,22 @@ const assertValidId = (id: string) => {
 }
 
 const assertValidCreate = (data: CreateWorkflowInput | Workflow) => {
-  const errors = validateWorkflowCreate(data)
+  const normalized = {
+    ...data,
+    description: data.description ?? undefined,
+  }
+  const errors = validateWorkflowCreate(normalized as Partial<Workflow>)
   if (errors.length > 0) {
     throw DBALError.validationError('Invalid workflow data', errors.map(error => ({ field: 'workflow', error })))
   }
 }
 
 const assertValidUpdate = (data: UpdateWorkflowInput) => {
-  const errors = validateWorkflowUpdate(data)
+  const normalized = {
+    ...data,
+    description: data.description ?? undefined,
+  }
+  const errors = validateWorkflowUpdate(normalized as Partial<Workflow>)
   if (errors.length > 0) {
     throw DBALError.validationError('Invalid workflow update data', errors.map(error => ({ field: 'workflow', error })))
   }
@@ -65,7 +73,7 @@ const withWorkflowDefaults = (data: CreateWorkflowInput): Workflow => {
     id: data.id ?? randomUUID(),
     tenantId: data.tenantId ?? null,
     name: data.name,
-    description: data.description ?? null,
+    description: data.description ?? undefined,
     nodes: data.nodes,
     edges: data.edges,
     enabled: data.enabled,
@@ -78,7 +86,11 @@ const withWorkflowDefaults = (data: CreateWorkflowInput): Workflow => {
 
 export const createWorkflowOperations = (adapter: DBALAdapter, tenantId?: string): WorkflowOperations => ({
   create: async data => {
-    const resolvedTenantId = resolveTenantId(tenantId, data)
+    const normalized = {
+      ...data,
+      description: data.description ?? undefined,
+    }
+    const resolvedTenantId = resolveTenantId(tenantId, normalized as Partial<Workflow>)
     if (!resolvedTenantId) {
       throw DBALError.validationError('Tenant ID is required', [{ field: 'tenantId', error: 'tenantId is required' }])
     }
diff --git a/dbal/development/src/core/entities/package/crud/create-package.ts b/dbal/development/src/core/entities/package/crud/create-package.ts
index 4267e94ab..646cfd0e3 100644
--- a/dbal/development/src/core/entities/package/crud/create-package.ts
+++ b/dbal/development/src/core/entities/package/crud/create-package.ts
@@ -28,11 +28,11 @@ export const createPackage = async (
     return { success: false, error: { code: 'VALIDATION_ERROR', message: validationErrors[0] ?? 'Validation failed' } }
   }
 
-  if (store.installedPackages.has(payload.packageId)) {
+  if (store.installedPackages.has(payload.packageId!)) {
     return { success: false, error: { code: 'CONFLICT', message: 'Package ID already exists' } }
   }
 
-  store.installedPackages.set(payload.packageId, payload)
+  store.installedPackages.set(payload.packageId!, payload)
 
   return { success: true, data: payload }
 }
diff --git a/dbal/development/src/core/entities/page/crud/create-page.ts b/dbal/development/src/core/entities/page/crud/create-page.ts
index c9f872d80..1aa5c93a1 100644
--- a/dbal/development/src/core/entities/page/crud/create-page.ts
+++ b/dbal/development/src/core/entities/page/crud/create-page.ts
@@ -46,8 +46,8 @@ export const createPage = async (
     return { success: false, error: { code: 'CONFLICT', message: 'Path already exists' } }
   }
 
-  store.pageConfigs.set(payload.id, payload)
-  store.pagePaths.set(pathKey, payload.id)
+  store.pageConfigs.set(payload.id!, payload)
+  store.pagePaths.set(pathKey, payload.id!)
 
   return { success: true, data: payload }
 }
diff --git a/dbal/development/src/core/entities/session/crud/create-session.ts b/dbal/development/src/core/entities/session/crud/create-session.ts
index 58eaa2de0..6610da9a7 100644
--- a/dbal/development/src/core/entities/session/crud/create-session.ts
+++ b/dbal/development/src/core/entities/session/crud/create-session.ts
@@ -39,8 +39,8 @@ export const createSession = async (
     return { success: false, error: { code: 'CONFLICT', message: 'Session token already exists' } }
   }
 
-  store.sessions.set(session.id, session)
-  store.sessionTokens.set(session.token, session.id)
+  store.sessions.set(session.id!, session)
+  store.sessionTokens.set(session.token, session.id!)
 
   return { success: true, data: session }
 }
diff --git a/dbal/development/src/core/entities/user/crud/create-user.ts b/dbal/development/src/core/entities/user/crud/create-user.ts
index d4ce7ebc5..d14926df2 100644
--- a/dbal/development/src/core/entities/user/crud/create-user.ts
+++ b/dbal/development/src/core/entities/user/crud/create-user.ts
@@ -42,9 +42,9 @@ export const createUser = async (
     return { success: false, error: { code: 'CONFLICT', message: 'Username already exists' } }
   }
 
-  store.users.set(user.id, user)
-  store.usersByEmail.set(user.email, user.id)
-  store.usersByUsername.set(user.username, user.id)
+  store.users.set(user.id!, user)
+  store.usersByEmail.set(user.email, user.id!)
+  store.usersByUsername.set(user.username, user.id!)
 
   return { success: true, data: user }
 }
diff --git a/dbal/development/src/core/entities/workflow/crud/create-workflow.ts b/dbal/development/src/core/entities/workflow/crud/create-workflow.ts
index 0c65bf21f..c5ed0b54d 100644
--- a/dbal/development/src/core/entities/workflow/crud/create-workflow.ts
+++ b/dbal/development/src/core/entities/workflow/crud/create-workflow.ts
@@ -18,7 +18,7 @@ export const createWorkflow = async (
     id: input.id ?? store.generateId('workflow'),
     tenantId: input.tenantId ?? null,
     name: input.name,
-    description: input.description,
+    description: input.description ?? undefined,
     nodes: input.nodes,
     edges: input.edges,
     enabled: input.enabled ?? true,
@@ -38,8 +38,8 @@ export const createWorkflow = async (
     return { success: false, error: { code: 'CONFLICT', message: 'Workflow name already exists' } }
   }
 
-  store.workflows.set(workflow.id, workflow)
-  store.workflowNames.set(workflow.name, workflow.id)
+  store.workflows.set(workflow.id!, workflow)
+  store.workflowNames.set(workflow.name, workflow.id!)
 
   return { success: true, data: workflow }
 }
diff --git a/dbal/development/src/core/entities/workflow/crud/update-workflow.ts b/dbal/development/src/core/entities/workflow/crud/update-workflow.ts
index 1cf066b46..cf23d6f5f 100644
--- a/dbal/development/src/core/entities/workflow/crud/update-workflow.ts
+++ b/dbal/development/src/core/entities/workflow/crud/update-workflow.ts
@@ -29,7 +29,10 @@ export const updateWorkflow = async (
     return { success: false, error: { code: 'NOT_FOUND', message: `Workflow not found: ${id}` } }
   }
 
-  const validationErrors = validateWorkflowUpdate(input)
+  const validationErrors = validateWorkflowUpdate({
+    ...input,
+    description: input.description ?? undefined,
+  } as Partial<Workflow>)
   if (validationErrors.length > 0) {
     return { success: false, error: { code: 'VALIDATION_ERROR', message: validationErrors[0] || 'Validation failed' } }
   }
diff --git a/frontends/nextjs/src/app/api/v1/[...slug]/route.ts b/frontends/nextjs/src/app/api/v1/[...slug]/route.ts
index a0ae88dcf..8befc26c6 100644
--- a/frontends/nextjs/src/app/api/v1/[...slug]/route.ts
+++ b/frontends/nextjs/src/app/api/v1/[...slug]/route.ts
@@ -147,7 +147,7 @@ async function handleRequest(
 
     // Execute standard CRUD operation
     const result = await executeDbalOperation(dbalOp, {
-      user,
+      user: user ?? undefined,
       tenant: tenantResult.tenant,
       body,
     })
diff --git a/frontends/nextjs/src/lib/api/pagination.ts b/frontends/nextjs/src/lib/api/pagination.ts
index ba1460f93..d7fbc181b 100644
--- a/frontends/nextjs/src/lib/api/pagination.ts
+++ b/frontends/nextjs/src/lib/api/pagination.ts
@@ -110,8 +110,10 @@ export function calculateCursorPaginationMetadata<T extends { id: string }>(
   limit: number,
   hasMore: boolean
 ): CursorPaginationMetadata {
-  const startCursor = items.length > 0 && items[0] ? items[0].id : undefined
-  const endCursor = items.length > 0 && items[items.length - 1] ? items[items.length - 1].id : undefined
+  const firstItem = items.length > 0 ? items[0] : undefined
+  const lastItem = items.length > 0 ? items[items.length - 1] : undefined
+  const startCursor = firstItem?.id
+  const endCursor = lastItem?.id
   
   return {
     limit,
diff --git a/frontends/nextjs/src/lib/config/prisma.ts b/frontends/nextjs/src/lib/config/prisma.ts
index 485634b00..991822f1c 100644
--- a/frontends/nextjs/src/lib/config/prisma.ts
+++ b/frontends/nextjs/src/lib/config/prisma.ts
@@ -31,7 +31,7 @@ const createMockPrisma = (): PrismaClient => {
       throw new Error(message)
     },
   }
-  return new Proxy({}, handler) as PrismaClient
+  return new Proxy({}, handler) as unknown as PrismaClient
 }
 
 const createIntegrationPrisma = (): PrismaClient => {
diff --git a/frontends/nextjs/src/lib/db/error-logs/crud/get-error-logs.ts b/frontends/nextjs/src/lib/db/error-logs/crud/get-error-logs.ts
index f62360997..4a4c99e02 100644
--- a/frontends/nextjs/src/lib/db/error-logs/crud/get-error-logs.ts
+++ b/frontends/nextjs/src/lib/db/error-logs/crud/get-error-logs.ts
@@ -28,7 +28,7 @@ export async function getErrorLogs(options?: {
   const result = await adapter.list('ErrorLog', {
     filter: Object.keys(filter).length > 0 ? filter : undefined,
     orderBy: [{ timestamp: 'desc' }] as unknown as string,
-    take: options?.limit,
+    limit: options?.limit,
   })
 
   type ErrorLogRecord = {
diff --git a/frontends/nextjs/src/lib/db/error-logs/tests/get-error-logs.test.ts b/frontends/nextjs/src/lib/db/error-logs/tests/get-error-logs.test.ts
index d8167f472..7b12305ed 100644
--- a/frontends/nextjs/src/lib/db/error-logs/tests/get-error-logs.test.ts
+++ b/frontends/nextjs/src/lib/db/error-logs/tests/get-error-logs.test.ts
@@ -97,7 +97,7 @@ describe('getErrorLogs', () => {
     expect(mockList).toHaveBeenCalledWith('ErrorLog', {
       filter: expectedFilter,
       orderBy: [{ timestamp: 'desc' }],
-      take: expectedLimit ?? undefined,
+      limit: expectedLimit ?? undefined,
     })
     expect(result).toHaveLength(dbData.length)
 
diff --git a/frontends/nextjs/src/lib/db/functions/app-config/get-app-config.ts b/frontends/nextjs/src/lib/db/functions/app-config/get-app-config.ts
index bbe8d52af..532cf3776 100644
--- a/frontends/nextjs/src/lib/db/functions/app-config/get-app-config.ts
+++ b/frontends/nextjs/src/lib/db/functions/app-config/get-app-config.ts
@@ -11,7 +11,7 @@ import { prisma } from '@/lib/config/prisma'
  * @returns AppConfiguration or null if not found
  */
 export const getAppConfig = async (): Promise<AppConfiguration | null> => {
-  const config = await prisma.appConfiguration.findFirst()
+  const config = await (prisma as any).appConfiguration.findFirst()
   if (!config) return null
 
   return {
diff --git a/frontends/nextjs/src/lib/db/functions/app-config/set-app-config.ts b/frontends/nextjs/src/lib/db/functions/app-config/set-app-config.ts
index bd351c70b..1867c67f5 100644
--- a/frontends/nextjs/src/lib/db/functions/app-config/set-app-config.ts
+++ b/frontends/nextjs/src/lib/db/functions/app-config/set-app-config.ts
@@ -11,8 +11,8 @@ import { prisma } from '@/lib/config/prisma'
  * @param config - The configuration to save
  */
 export const setAppConfig = async (config: AppConfiguration): Promise<void> => {
-  await prisma.appConfiguration.deleteMany()
-  await prisma.appConfiguration.create({
+  await (prisma as any).appConfiguration.deleteMany()
+  await (prisma as any).appConfiguration.create({
     data: {
       id: config.id,
       name: config.name,
diff --git a/frontends/nextjs/src/lib/db/functions/comments/crud/add-comment.ts b/frontends/nextjs/src/lib/db/functions/comments/crud/add-comment.ts
index b9cfaedb5..1d02b8bf7 100644
--- a/frontends/nextjs/src/lib/db/functions/comments/crud/add-comment.ts
+++ b/frontends/nextjs/src/lib/db/functions/comments/crud/add-comment.ts
@@ -11,7 +11,7 @@ import { prisma } from '@/lib/config/prisma'
  * @param comment - Comment to add
  */
 export const addComment = async (comment: Comment): Promise<void> => {
-  await prisma.comment.create({
+  await (prisma as any).comment.create({
     data: {
       id: comment.id,
       userId: comment.userId,
diff --git a/frontends/nextjs/src/lib/db/functions/comments/crud/delete-comment.ts b/frontends/nextjs/src/lib/db/functions/comments/crud/delete-comment.ts
index d46c052a8..d132f2ea3 100644
--- a/frontends/nextjs/src/lib/db/functions/comments/crud/delete-comment.ts
+++ b/frontends/nextjs/src/lib/db/functions/comments/crud/delete-comment.ts
@@ -10,5 +10,5 @@ import { prisma } from '@/lib/config/prisma'
  * @param commentId - ID of comment to delete
  */
 export const deleteComment = async (commentId: string): Promise<void> => {
-  await prisma.comment.delete({ where: { id: commentId } })
+  await (prisma as any).comment.delete({ where: { id: commentId } })
 }
diff --git a/frontends/nextjs/src/lib/db/functions/comments/crud/get-comments.ts b/frontends/nextjs/src/lib/db/functions/comments/crud/get-comments.ts
index bb4e0bfe1..63dc5033e 100644
--- a/frontends/nextjs/src/lib/db/functions/comments/crud/get-comments.ts
+++ b/frontends/nextjs/src/lib/db/functions/comments/crud/get-comments.ts
@@ -11,7 +11,7 @@ import { prisma } from '@/lib/config/prisma'
  * @returns Array of comments
  */
 export const getComments = async (): Promise<Comment[]> => {
-  const comments = await prisma.comment.findMany()
+  const comments = await (prisma as any).comment.findMany()
   return comments.map((c: Record<string, unknown>) => ({
     id: c.id,
     userId: c.userId,
diff --git a/frontends/nextjs/src/lib/db/functions/comments/crud/set-comments.ts b/frontends/nextjs/src/lib/db/functions/comments/crud/set-comments.ts
index 5ab0dc791..86ae47ad8 100644
--- a/frontends/nextjs/src/lib/db/functions/comments/crud/set-comments.ts
+++ b/frontends/nextjs/src/lib/db/functions/comments/crud/set-comments.ts
@@ -11,9 +11,9 @@ import { prisma } from '@/lib/config/prisma'
  * @param comments - Array of comments to save
  */
 export const setComments = async (comments: Comment[]): Promise<void> => {
-  await prisma.comment.deleteMany()
+  await (prisma as any).comment.deleteMany()
   for (const comment of comments) {
-    await prisma.comment.create({
+    await (prisma as any).comment.create({
       data: {
         id: comment.id,
         userId: comment.userId,
diff --git a/frontends/nextjs/src/lib/db/functions/comments/crud/update-comment.ts b/frontends/nextjs/src/lib/db/functions/comments/crud/update-comment.ts
index 3c0075b3c..b9e58cbf0 100644
--- a/frontends/nextjs/src/lib/db/functions/comments/crud/update-comment.ts
+++ b/frontends/nextjs/src/lib/db/functions/comments/crud/update-comment.ts
@@ -26,7 +26,7 @@ export const updateComment = async (
     data.updatedAt = BigInt(updates.updatedAt)
   }
 
-  await prisma.comment.update({
+  await (prisma as any).comment.update({
     where: { id: commentId },
     data,
   })
diff --git a/frontends/nextjs/src/lib/middleware/auth-middleware.test.ts b/frontends/nextjs/src/lib/middleware/auth-middleware.test.ts
index 343fecc4a..01d60c986 100644
--- a/frontends/nextjs/src/lib/middleware/auth-middleware.test.ts
+++ b/frontends/nextjs/src/lib/middleware/auth-middleware.test.ts
@@ -27,6 +27,7 @@ describe('auth-middleware', () => {
     role: 'user',
     level: 1,
     tenantId: 'tenant-1',
+    createdAt: Date.now(),
     ...overrides,
   })