diff --git a/backend/migrations/tenant/20260411000001_create_knowledge_layer_tables.js b/backend/migrations/tenant/20260411000001_create_knowledge_layer_tables.js
index a1bbfd8..1c70097 100644
--- a/backend/migrations/tenant/20260411000001_create_knowledge_layer_tables.js
+++ b/backend/migrations/tenant/20260411000001_create_knowledge_layer_tables.js
@@ -52,11 +52,11 @@ exports.up = async function (knex) {
 
   await knex.schema.createTable('semantic_links', (table) => {
     table.uuid('id').primary().defaultTo(knex.raw('(UUID())'));
-    table.string('source_entity_type').notNullable();
+    table.string('source_entity_type', 100).notNullable();
     table.uuid('source_entity_id').notNullable();
-    table.string('target_entity_type').notNullable();
+    table.string('target_entity_type', 100).notNullable();
     table.uuid('target_entity_id').notNullable();
-    table.string('link_type').notNullable().defaultTo('related_to');
+    table.string('link_type', 100).notNullable().defaultTo('related_to');
     table.string('status').notNullable().defaultTo('suggested');
     table.string('origin').notNullable().defaultTo('semantic');
     table.decimal('confidence', 5, 4).notNullable().defaultTo(0);
diff --git a/frontend/components/knowledge/RecordCommentsPanel.vue b/frontend/components/knowledge/RecordCommentsPanel.vue
new file mode 100644
index 0000000..479edb3
--- /dev/null
+++ b/frontend/components/knowledge/RecordCommentsPanel.vue
@@ -0,0 +1,181 @@
+<script setup lang="ts">
+import { ref, watch, computed } from 'vue'
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
+import { Button } from '@/components/ui/button'
+import { Textarea } from '@/components/ui/textarea'
+import { Separator } from '@/components/ui/separator'
+import { useApi } from '@/composables/useApi'
+import { useAuth } from '@/composables/useAuth'
+
+type CommentRecord = {
+  id: string
+  content: string
+  author_user_id: string
+  created_at: string
+  updated_at: string
+}
+
+interface Props {
+  objectApiName: string
+  recordId: string
+}
+
+const props = defineProps<Props>()
+const { api } = useApi()
+const { user } = useAuth()
+
+const comments = ref<CommentRecord[]>([])
+const loading = ref(false)
+const error = ref<string | null>(null)
+const newComment = ref('')
+const saving = ref(false)
+const editingId = ref<string | null>(null)
+const editContent = ref('')
+
+const isOwner = (comment: CommentRecord) => comment.author_user_id === user.value?.id
+
+const formatDate = (value?: string) => {
+  if (!value) return ''
+  const date = new Date(value)
+  if (Number.isNaN(date.getTime())) return value
+  return date.toLocaleString()
+}
+
+const canSubmit = computed(() => newComment.value.trim().length > 0 && !saving.value)
+const canSaveEdit = computed(() => editContent.value.trim().length > 0 && !saving.value)
+
+const fetchComments = async () => {
+  if (!props.objectApiName || !props.recordId) return
+  loading.value = true
+  error.value = null
+  try {
+    const data = await api.get(`/knowledge/comments/${props.objectApiName}/${props.recordId}`)
+    comments.value = Array.isArray(data) ? data : []
+  } catch (e: any) {
+    error.value = e.message || 'Failed to load comments'
+  } finally {
+    loading.value = false
+  }
+}
+
+const addComment = async () => {
+  if (!canSubmit.value) return
+  saving.value = true
+  try {
+    await api.post('/knowledge/comments', {
+      parentObjectApiName: props.objectApiName,
+      parentRecordId: props.recordId,
+      content: newComment.value.trim(),
+    })
+    newComment.value = ''
+    await fetchComments()
+  } catch (e: any) {
+    error.value = e.message || 'Failed to add comment'
+  } finally {
+    saving.value = false
+  }
+}
+
+const startEdit = (comment: CommentRecord) => {
+  editingId.value = comment.id
+  editContent.value = comment.content
+}
+
+const cancelEdit = () => {
+  editingId.value = null
+  editContent.value = ''
+}
+
+const saveEdit = async () => {
+  if (!editingId.value || !canSaveEdit.value) return
+  saving.value = true
+  try {
+    await api.patch(`/knowledge/comments/${editingId.value}`, {
+      content: editContent.value.trim(),
+    })
+    editingId.value = null
+    editContent.value = ''
+    await fetchComments()
+  } catch (e: any) {
+    error.value = e.message || 'Failed to update comment'
+  } finally {
+    saving.value = false
+  }
+}
+
+const deleteComment = async (comment: CommentRecord) => {
+  if (!confirm('Delete this comment?')) return
+  saving.value = true
+  try {
+    await api.delete(`/knowledge/comments/${comment.id}`)
+    await fetchComments()
+  } catch (e: any) {
+    error.value = e.message || 'Failed to delete comment'
+  } finally {
+    saving.value = false
+  }
+}
+
+watch(
+  () => [props.objectApiName, props.recordId],
+  () => {
+    fetchComments()
+  },
+  { immediate: true },
+)
+</script>
+
+<template>
+  <Card>
+    <CardHeader>
+      <CardTitle>Comments</CardTitle>
+    </CardHeader>
+    <CardContent class="space-y-4">
+      <div class="space-y-3">
+        <Textarea
+          v-model="newComment"
+          placeholder="Add a comment..."
+          :disabled="saving"
+          class="min-h-[96px]"
+        />
+        <div class="flex items-center justify-between">
+          <p class="text-sm text-muted-foreground" v-if="error">{{ error }}</p>
+          <Button size="sm" :disabled="!canSubmit" @click="addComment">
+            Add Comment
+          </Button>
+        </div>
+      </div>
+
+      <Separator />
+
+      <div v-if="loading" class="text-sm text-muted-foreground">Loading comments...</div>
+      <div v-else-if="comments.length === 0" class="text-sm text-muted-foreground">
+        No comments yet.
+      </div>
+      <div v-else class="space-y-4">
+        <div v-for="comment in comments" :key="comment.id" class="rounded-lg border p-4 space-y-2">
+          <div class="flex items-center justify-between">
+            <div class="text-xs text-muted-foreground">
+              <span>Author: {{ comment.author_user_id }}</span>
+              <span class="mx-2">•</span>
+              <span>{{ formatDate(comment.created_at) }}</span>
+            </div>
+            <div class="flex items-center gap-2" v-if="isOwner(comment)">
+              <Button variant="ghost" size="sm" @click="startEdit(comment)">Edit</Button>
+              <Button variant="ghost" size="sm" @click="deleteComment(comment)">Delete</Button>
+            </div>
+          </div>
+
+          <div v-if="editingId === comment.id" class="space-y-2">
+            <Textarea v-model="editContent" :disabled="saving" class="min-h-[80px]" />
+            <div class="flex items-center gap-2">
+              <Button size="sm" :disabled="!canSaveEdit" @click="saveEdit">Save</Button>
+              <Button variant="ghost" size="sm" @click="cancelEdit">Cancel</Button>
+            </div>
+          </div>
+          <p v-else class="text-sm whitespace-pre-line">{{ comment.content }}</p>
+        </div>
+      </div>
+    </CardContent>
+  </Card>
+</template>
diff --git a/frontend/components/knowledge/SemanticLinksPanel.vue b/frontend/components/knowledge/SemanticLinksPanel.vue
new file mode 100644
index 0000000..6277516
--- /dev/null
+++ b/frontend/components/knowledge/SemanticLinksPanel.vue
@@ -0,0 +1,220 @@
+<script setup lang="ts">
+import { ref, watch, computed } from 'vue'
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
+import { Button } from '@/components/ui/button'
+import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs'
+import { Separator } from '@/components/ui/separator'
+import { useApi } from '@/composables/useApi'
+
+type SemanticLink = {
+  id: string
+  source_entity_type: string
+  source_entity_id: string
+  target_entity_type: string
+  target_entity_id: string
+  link_type: string
+  status: string
+  origin: string
+  confidence?: number
+  reason?: string
+  evidence?: any
+  updated_at?: string
+}
+
+interface Props {
+  objectApiName: string
+  recordId: string
+}
+
+const props = defineProps<Props>()
+const { api } = useApi()
+
+const links = ref<SemanticLink[]>([])
+const loading = ref(false)
+const error = ref<string | null>(null)
+const activeTab = ref<'all' | 'suggested' | 'approved' | 'rejected' | 'dismissed'>('suggested')
+
+const formatDate = (value?: string) => {
+  if (!value) return ''
+  const date = new Date(value)
+  if (Number.isNaN(date.getTime())) return value
+  return date.toLocaleString()
+}
+
+const formatConfidence = (value?: number) => {
+  if (value === undefined || value === null) return '—'
+  return `${Math.round(value * 100)}%`
+}
+
+const getOtherSide = (link: SemanticLink) => {
+  const isSource =
+    link.source_entity_type === props.objectApiName &&
+    link.source_entity_id === props.recordId
+  return {
+    entityType: isSource ? link.target_entity_type : link.source_entity_type,
+    entityId: isSource ? link.target_entity_id : link.source_entity_id,
+  }
+}
+
+const parseEvidence = (raw: any) => {
+  if (!raw) return null
+  if (typeof raw === 'object') return raw
+  try {
+    return JSON.parse(raw)
+  } catch {
+    return null
+  }
+}
+
+const fetchLinks = async () => {
+  if (!props.objectApiName || !props.recordId) return
+  loading.value = true
+  error.value = null
+  try {
+    const params =
+      activeTab.value === 'all'
+        ? undefined
+        : { status: activeTab.value }
+    const data = await api.get(`/knowledge/semantic/links/${props.objectApiName}/${props.recordId}`, {
+      params,
+    })
+    links.value = Array.isArray(data) ? data : []
+  } catch (e: any) {
+    error.value = e.message || 'Failed to load semantic links'
+  } finally {
+    loading.value = false
+  }
+}
+
+const reviewLink = async (id: string, status: 'approved' | 'rejected' | 'dismissed') => {
+  try {
+    await api.patch(`/knowledge/semantic/links/${id}/review`, { status })
+    await fetchLinks()
+  } catch (e: any) {
+    error.value = e.message || 'Failed to update link'
+  }
+}
+
+const canApprove = (status: string) => status !== 'approved'
+const canReject = (status: string) => status !== 'rejected'
+const canDismiss = (status: string) => status !== 'dismissed'
+
+watch(
+  () => [props.objectApiName, props.recordId, activeTab.value],
+  () => {
+    fetchLinks()
+  },
+  { immediate: true },
+)
+</script>
+
+<template>
+  <Card>
+    <CardHeader class="flex flex-row items-center justify-between">
+      <CardTitle>Semantic Links</CardTitle>
+      <Button variant="ghost" size="sm" @click="fetchLinks">Refresh</Button>
+    </CardHeader>
+    <CardContent class="space-y-4">
+      <Tabs v-model="activeTab" class="space-y-4">
+        <TabsList>
+          <TabsTrigger value="suggested">Suggested</TabsTrigger>
+          <TabsTrigger value="approved">Approved</TabsTrigger>
+          <TabsTrigger value="rejected">Rejected</TabsTrigger>
+          <TabsTrigger value="dismissed">Dismissed</TabsTrigger>
+          <TabsTrigger value="all">All</TabsTrigger>
+        </TabsList>
+
+        <TabsContent :value="activeTab" class="space-y-4">
+          <div v-if="loading" class="text-sm text-muted-foreground">
+            Loading links...
+          </div>
+          <div v-else-if="error" class="text-sm text-destructive">
+            {{ error }}
+          </div>
+          <div v-else-if="links.length === 0" class="text-sm text-muted-foreground">
+            No links found.
+          </div>
+          <div v-else class="space-y-4">
+            <div
+              v-for="link in links"
+              :key="link.id"
+              class="rounded-lg border p-4 space-y-3"
+            >
+              <div class="flex flex-wrap items-center justify-between gap-2">
+                <div class="text-sm font-medium">
+                  {{ getOtherSide(link).entityType }} · {{ getOtherSide(link).entityId }}
+                </div>
+                <div class="text-xs text-muted-foreground">
+                  {{ link.link_type }} • {{ link.origin }} • {{ formatConfidence(link.confidence) }}
+                </div>
+              </div>
+
+              <div class="text-xs text-muted-foreground">
+                Status: <span class="font-medium text-foreground">{{ link.status }}</span>
+                <span v-if="link.updated_at" class="ml-2">Updated: {{ formatDate(link.updated_at) }}</span>
+              </div>
+
+              <p v-if="link.reason" class="text-sm">{{ link.reason }}</p>
+
+              <div v-if="parseEvidence(link.evidence)" class="text-xs text-muted-foreground space-y-2">
+                <Separator />
+                <div>
+                  <div class="font-medium text-foreground">Evidence</div>
+                  <div v-if="parseEvidence(link.evidence)?.sourceSignals?.length">
+                    <div class="mt-1">Source signals:</div>
+                    <ul class="list-disc pl-4">
+                      <li
+                        v-for="(signal, idx) in parseEvidence(link.evidence).sourceSignals"
+                        :key="idx"
+                      >
+                        {{ signal.sourceKind }}: {{ signal.text }}
+                      </li>
+                    </ul>
+                  </div>
+                  <div v-if="parseEvidence(link.evidence)?.matchedChunks?.length" class="mt-2">
+                    <div>Matched:</div>
+                    <ul class="list-disc pl-4">
+                      <li
+                        v-for="(match, idx) in parseEvidence(link.evidence).matchedChunks"
+                        :key="idx"
+                      >
+                        {{ match.sourceKind }}: {{ match.text }}
+                      </li>
+                    </ul>
+                  </div>
+                </div>
+              </div>
+
+              <div class="flex items-center gap-2">
+                <Button
+                  size="sm"
+                  variant="outline"
+                  @click="reviewLink(link.id, 'approved')"
+                  :disabled="!canApprove(link.status)"
+                >
+                  Approve
+                </Button>
+                <Button
+                  size="sm"
+                  variant="outline"
+                  @click="reviewLink(link.id, 'rejected')"
+                  :disabled="!canReject(link.status)"
+                >
+                  Reject
+                </Button>
+                <Button
+                  size="sm"
+                  variant="outline"
+                  @click="reviewLink(link.id, 'dismissed')"
+                  :disabled="!canDismiss(link.status)"
+                >
+                  Dismiss
+                </Button>
+              </div>
+            </div>
+          </div>
+        </TabsContent>
+      </Tabs>
+    </CardContent>
+  </Card>
+</template>
diff --git a/frontend/components/views/DetailView.vue b/frontend/components/views/DetailView.vue
index ef17100..def029a 100644
--- a/frontend/components/views/DetailView.vue
+++ b/frontend/components/views/DetailView.vue
@@ -5,6 +5,8 @@ import { Button } from '@/components/ui/button'
 import { Separator } from '@/components/ui/separator'
 import FieldRenderer from '@/components/fields/FieldRenderer.vue'
 import RelatedList from '@/components/RelatedList.vue'
+import RecordCommentsPanel from '@/components/knowledge/RecordCommentsPanel.vue'
+import SemanticLinksPanel from '@/components/knowledge/SemanticLinksPanel.vue'
 import { DetailViewConfig, ViewMode, FieldSection, FieldConfig, RelatedListConfig } from '@/types/field-types'
 import { Edit, Trash2, ArrowLeft } from 'lucide-vue-next'
 import {
@@ -167,6 +169,18 @@ const getFieldsBySection = (section: FieldSection) => {
         @create="(objectApiName, parentId) => emit('createRelated', objectApiName, parentId)"
       />
     </div>
+
+    <!-- Knowledge Panels -->
+    <div v-if="data?.id && config?.objectApiName" class="space-y-6">
+      <RecordCommentsPanel
+        :object-api-name="config.objectApiName"
+        :record-id="data.id"
+      />
+      <SemanticLinksPanel
+        :object-api-name="config.objectApiName"
+        :record-id="data.id"
+      />
+    </div>
   </div>
 </template>
 
diff --git a/frontend/components/views/DetailViewEnhanced.vue b/frontend/components/views/DetailViewEnhanced.vue
index 7b2f874..1ac046c 100644
--- a/frontend/components/views/DetailViewEnhanced.vue
+++ b/frontend/components/views/DetailViewEnhanced.vue
@@ -7,6 +7,8 @@ import FieldRenderer from '@/components/fields/FieldRenderer.vue'
 import PageLayoutRenderer from '@/components/PageLayoutRenderer.vue'
 import RelatedList from '@/components/RelatedList.vue'
 import RecordSharing from '@/components/RecordSharing.vue'
+import RecordCommentsPanel from '@/components/knowledge/RecordCommentsPanel.vue'
+import SemanticLinksPanel from '@/components/knowledge/SemanticLinksPanel.vue'
 import { DetailViewConfig, ViewMode, FieldSection, FieldConfig, RelatedListConfig } from '@/types/field-types'
 import { Edit, Trash2, ArrowLeft } from 'lucide-vue-next'
 import {
@@ -170,6 +172,9 @@ const visibleRelatedLists = computed<RelatedListConfig[]>(() => {
         <TabsTrigger v-if="showSharing && data.id" value="sharing">
           Sharing
         </TabsTrigger>
+        <TabsTrigger v-if="data.id && config.objectApiName" value="knowledge">
+          Knowledge
+        </TabsTrigger>
       </TabsList>
 
       <!-- Details Tab -->
@@ -277,6 +282,20 @@ const visibleRelatedLists = computed<RelatedListConfig[]>(() => {
           </CardContent>
         </Card>
       </TabsContent>
+
+      <!-- Knowledge Tab -->
+      <TabsContent value="knowledge" class="space-y-6">
+        <RecordCommentsPanel
+          v-if="data.id && config.objectApiName"
+          :object-api-name="config.objectApiName"
+          :record-id="data.id"
+        />
+        <SemanticLinksPanel
+          v-if="data.id && config.objectApiName"
+          :object-api-name="config.objectApiName"
+          :record-id="data.id"
+        />
+      </TabsContent>
     </Tabs>
   </div>
 </template>