diff --git a/app/api/profile/avatar/route.ts b/app/api/profile/avatar/route.ts
index 16e485f..3bc4907 100644
--- a/app/api/profile/avatar/route.ts
+++ b/app/api/profile/avatar/route.ts
@@ -27,11 +27,11 @@ export async function POST(request: Request) {
   }
 
   if (!ALLOWED_TYPES.has(file.type)) {
-    return Response.json({ error: 'Alleen JPEG, PNG en WebP zijn toegestaan' }, { status: 400 })
+    return Response.json({ error: 'Alleen JPEG, PNG en WebP zijn toegestaan' }, { status: 422 })
   }
 
   if (file.size > MAX_BYTES) {
-    return Response.json({ error: 'Bestand is groter dan 12 MB' }, { status: 400 })
+    return Response.json({ error: 'Bestand is groter dan 12 MB' }, { status: 422 })
   }
 
   const input = Buffer.from(await file.arrayBuffer())
diff --git a/app/api/stories/[id]/log/route.ts b/app/api/stories/[id]/log/route.ts
index 8e1daa3..a069213 100644
--- a/app/api/stories/[id]/log/route.ts
+++ b/app/api/stories/[id]/log/route.ts
@@ -1,23 +1,29 @@
 import { authenticateApiRequest } from '@/lib/api-auth'
 import { prisma } from '@/lib/prisma'
 import { productAccessFilter } from '@/lib/product-access'
+import { Prisma } from '@prisma/client'
 import { z } from 'zod'
 
+const metadataField = z.record(z.string(), z.unknown()).optional()
+
 const logSchema = z.discriminatedUnion('type', [
   z.object({
     type: z.literal('IMPLEMENTATION_PLAN'),
     content: z.string().min(1),
+    metadata: metadataField,
   }),
   z.object({
     type: z.literal('TEST_RESULT'),
     content: z.string().min(1),
     status: z.enum(['PASSED', 'FAILED']),
+    metadata: metadataField,
   }),
   z.object({
     type: z.literal('COMMIT'),
     content: z.string().min(1),
     commit_hash: z.string().min(1),
     commit_message: z.string().min(1),
+    metadata: metadataField,
   }),
 ])
 
@@ -45,7 +51,7 @@ export async function POST(
   const body = await request.json().catch(() => null)
   const parsed = logSchema.safeParse(body)
   if (!parsed.success) {
-    return Response.json({ error: parsed.error.flatten() }, { status: 400 })
+    return Response.json({ error: parsed.error.flatten() }, { status: 422 })
   }
 
   const log = await prisma.storyLog.create({
@@ -56,6 +62,9 @@ export async function POST(
       status: 'status' in parsed.data ? parsed.data.status : null,
       commit_hash: 'commit_hash' in parsed.data ? parsed.data.commit_hash : null,
       commit_message: 'commit_message' in parsed.data ? parsed.data.commit_message : null,
+      metadata: parsed.data.metadata
+        ? (parsed.data.metadata as Prisma.InputJsonValue)
+        : Prisma.JsonNull,
     },
   })
 
diff --git a/app/api/stories/[id]/tasks/reorder/route.ts b/app/api/stories/[id]/tasks/reorder/route.ts
index 4c38995..a05528f 100644
--- a/app/api/stories/[id]/tasks/reorder/route.ts
+++ b/app/api/stories/[id]/tasks/reorder/route.ts
@@ -24,7 +24,7 @@ export async function PATCH(
   const body = await request.json().catch(() => null)
   const parsed = bodySchema.safeParse(body)
   if (!parsed.success) {
-    return Response.json({ error: parsed.error.flatten() }, { status: 400 })
+    return Response.json({ error: parsed.error.flatten() }, { status: 422 })
   }
 
   const story = await prisma.story.findFirst({
@@ -38,7 +38,7 @@ export async function PATCH(
   const storyTaskIds = new Set(story.tasks.map(t => t.id))
   const invalidId = parsed.data.task_ids.find(id => !storyTaskIds.has(id))
   if (invalidId) {
-    return Response.json({ error: `Ongeldig task_id: ${invalidId}` }, { status: 400 })
+    return Response.json({ error: `Ongeldig task_id: ${invalidId}` }, { status: 422 })
   }
 
   await prisma.$transaction(
diff --git a/app/api/todos/route.ts b/app/api/todos/route.ts
index 90fe453..1e9db21 100644
--- a/app/api/todos/route.ts
+++ b/app/api/todos/route.ts
@@ -20,7 +20,7 @@ export async function POST(request: Request) {
   const body = await request.json().catch(() => null)
   const parsed = bodySchema.safeParse(body)
   if (!parsed.success) {
-    return Response.json({ error: parsed.error.flatten() }, { status: 400 })
+    return Response.json({ error: parsed.error.flatten() }, { status: 422 })
   }
 
   const product = await prisma.product.findFirst({