diff --git a/__tests__/stores/solo-store-realtime.test.ts b/__tests__/stores/solo-store-realtime.test.ts
new file mode 100644
index 0000000..589b961
--- /dev/null
+++ b/__tests__/stores/solo-store-realtime.test.ts
@@ -0,0 +1,109 @@
+import { describe, it, expect, beforeEach } from 'vitest'
+import { useSoloStore } from '@/stores/solo-store'
+import type { RealtimeEvent } from '@/stores/solo-store'
+import type { SoloTask } from '@/components/solo/solo-board'
+
+const baseTask = (id: string, overrides: Partial<SoloTask> = {}): SoloTask => ({
+  id,
+  title: `Task ${id}`,
+  description: null,
+  implementation_plan: null,
+  priority: 1,
+  sort_order: 1,
+  status: 'TO_DO',
+  story_id: 'story-1',
+  story_code: 'ST-100',
+  story_title: 'Original Story',
+  task_code: 'ST-100.1',
+  ...overrides,
+})
+
+const taskEvent = (overrides: Partial<RealtimeEvent>): RealtimeEvent => ({
+  op: 'U',
+  entity: 'task',
+  id: 'task-1',
+  story_id: 'story-1',
+  product_id: 'prod-1',
+  sprint_id: 'sprint-1',
+  assignee_id: 'user-1',
+  ...overrides,
+})
+
+const storyEvent = (overrides: Partial<RealtimeEvent>): RealtimeEvent => ({
+  op: 'U',
+  entity: 'story',
+  id: 'story-1',
+  product_id: 'prod-1',
+  sprint_id: 'sprint-1',
+  assignee_id: 'user-1',
+  ...overrides,
+})
+
+describe('solo-store realtime', () => {
+  beforeEach(() => {
+    useSoloStore.setState({ tasks: {}, pendingOps: new Set() })
+  })
+
+  it('applies a task status update', () => {
+    useSoloStore.getState().initTasks([baseTask('task-1', { status: 'TO_DO' })])
+    useSoloStore.getState().handleRealtimeEvent(taskEvent({ task_status: 'IN_PROGRESS' }))
+    expect(useSoloStore.getState().tasks['task-1'].status).toBe('IN_PROGRESS')
+  })
+
+  it('skips a task update when pendingOps has the id', () => {
+    useSoloStore.getState().initTasks([baseTask('task-1', { status: 'TO_DO' })])
+    useSoloStore.getState().markPending('task-1')
+    useSoloStore.getState().handleRealtimeEvent(taskEvent({ task_status: 'DONE' }))
+    expect(useSoloStore.getState().tasks['task-1'].status).toBe('TO_DO')
+  })
+
+  it('applies the update again once pendingOps is cleared', () => {
+    useSoloStore.getState().initTasks([baseTask('task-1', { status: 'TO_DO' })])
+    useSoloStore.getState().markPending('task-1')
+    useSoloStore.getState().handleRealtimeEvent(taskEvent({ task_status: 'DONE' }))
+    expect(useSoloStore.getState().tasks['task-1'].status).toBe('TO_DO')
+    useSoloStore.getState().clearPending('task-1')
+    useSoloStore.getState().handleRealtimeEvent(taskEvent({ task_status: 'DONE' }))
+    expect(useSoloStore.getState().tasks['task-1'].status).toBe('DONE')
+  })
+
+  it('removes a task on D op', () => {
+    useSoloStore.getState().initTasks([baseTask('task-1'), baseTask('task-2')])
+    useSoloStore.getState().handleRealtimeEvent(taskEvent({ id: 'task-1', op: 'D' }))
+    expect(useSoloStore.getState().tasks['task-1']).toBeUndefined()
+    expect(useSoloStore.getState().tasks['task-2']).toBeDefined()
+  })
+
+  it('ignores task INSERT/UPDATE for tasks not in the store', () => {
+    useSoloStore.getState().initTasks([baseTask('task-1')])
+    useSoloStore.getState().handleRealtimeEvent(taskEvent({ id: 'task-other', task_status: 'DONE' }))
+    expect(Object.keys(useSoloStore.getState().tasks)).toEqual(['task-1'])
+  })
+
+  it('updates story_title/code on all child tasks via story UPDATE', () => {
+    useSoloStore.getState().initTasks([
+      baseTask('task-1', { story_id: 'story-1' }),
+      baseTask('task-2', { story_id: 'story-1' }),
+      baseTask('task-3', { story_id: 'story-other', story_title: 'Other' }),
+    ])
+    useSoloStore.getState().handleRealtimeEvent(
+      storyEvent({ story_title: 'Renamed Story', story_code: 'ST-100B' }),
+    )
+    expect(useSoloStore.getState().tasks['task-1'].story_title).toBe('Renamed Story')
+    expect(useSoloStore.getState().tasks['task-1'].story_code).toBe('ST-100B')
+    expect(useSoloStore.getState().tasks['task-2'].story_title).toBe('Renamed Story')
+    expect(useSoloStore.getState().tasks['task-3'].story_title).toBe('Other')
+  })
+
+  it('removes all tasks of a story on story DELETE', () => {
+    useSoloStore.getState().initTasks([
+      baseTask('task-1', { story_id: 'story-1' }),
+      baseTask('task-2', { story_id: 'story-1' }),
+      baseTask('task-3', { story_id: 'story-other' }),
+    ])
+    useSoloStore.getState().handleRealtimeEvent(storyEvent({ op: 'D' }))
+    expect(useSoloStore.getState().tasks['task-1']).toBeUndefined()
+    expect(useSoloStore.getState().tasks['task-2']).toBeUndefined()
+    expect(useSoloStore.getState().tasks['task-3']).toBeDefined()
+  })
+})
diff --git a/prisma/migrations/20260427000216_extend_realtime_payload/migration.sql b/prisma/migrations/20260427000216_extend_realtime_payload/migration.sql
new file mode 100644
index 0000000..eb5bb6f
--- /dev/null
+++ b/prisma/migrations/20260427000216_extend_realtime_payload/migration.sql
@@ -0,0 +1,111 @@
+-- ST-804 prereq: extend the realtime trigger payload with the new-state
+-- fields the Solo Paneel needs for in-place rendering, so the client doesn't
+-- have to refetch on every update.
+--
+-- Added fields:
+--   task   → task_status, task_sort_order, task_title
+--   story  → story_status, story_sort_order, story_title, story_code
+--
+-- Description and implementation_plan stay out of the payload — they can
+-- be large and aren't needed for kanban-board rendering. UI fetches them
+-- on demand when the detail dialog opens.
+
+CREATE OR REPLACE FUNCTION notify_task_change() RETURNS trigger AS $$
+DECLARE
+  rec record;
+  story_row record;
+  payload jsonb;
+BEGIN
+  IF TG_OP = 'DELETE' THEN
+    rec := OLD;
+  ELSE
+    rec := NEW;
+  END IF;
+
+  SELECT product_id, sprint_id, assignee_id
+    INTO story_row
+    FROM stories
+    WHERE id = rec.story_id;
+
+  IF NOT FOUND THEN
+    RETURN rec;
+  END IF;
+
+  payload := jsonb_build_object(
+    'op', CASE TG_OP
+            WHEN 'INSERT' THEN 'I'
+            WHEN 'UPDATE' THEN 'U'
+            WHEN 'DELETE' THEN 'D'
+          END,
+    'entity', 'task',
+    'id', rec.id,
+    'story_id', rec.story_id,
+    'product_id', story_row.product_id,
+    'sprint_id', story_row.sprint_id,
+    'assignee_id', story_row.assignee_id,
+    'task_status', rec.status,
+    'task_sort_order', rec.sort_order,
+    'task_title', rec.title
+  );
+
+  IF TG_OP = 'UPDATE' THEN
+    payload := payload || jsonb_build_object(
+      'changed_fields',
+      COALESCE((
+        SELECT jsonb_agg(n.key)
+        FROM jsonb_each(to_jsonb(NEW)) n
+        JOIN jsonb_each(to_jsonb(OLD)) o USING (key)
+        WHERE n.value IS DISTINCT FROM o.value
+      ), '[]'::jsonb)
+    );
+  END IF;
+
+  PERFORM pg_notify('scrum4me_changes', payload::text);
+  RETURN rec;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION notify_story_change() RETURNS trigger AS $$
+DECLARE
+  rec record;
+  payload jsonb;
+BEGIN
+  IF TG_OP = 'DELETE' THEN
+    rec := OLD;
+  ELSE
+    rec := NEW;
+  END IF;
+
+  payload := jsonb_build_object(
+    'op', CASE TG_OP
+            WHEN 'INSERT' THEN 'I'
+            WHEN 'UPDATE' THEN 'U'
+            WHEN 'DELETE' THEN 'D'
+          END,
+    'entity', 'story',
+    'id', rec.id,
+    'product_id', rec.product_id,
+    'sprint_id', rec.sprint_id,
+    'assignee_id', rec.assignee_id,
+    'story_status', rec.status,
+    'story_sort_order', rec.sort_order,
+    'story_title', rec.title,
+    'story_code', rec.code
+  );
+
+  IF TG_OP = 'UPDATE' THEN
+    payload := payload || jsonb_build_object(
+      'changed_fields',
+      COALESCE((
+        SELECT jsonb_agg(n.key)
+        FROM jsonb_each(to_jsonb(NEW)) n
+        JOIN jsonb_each(to_jsonb(OLD)) o USING (key)
+        WHERE n.value IS DISTINCT FROM o.value
+      ), '[]'::jsonb)
+    );
+  END IF;
+
+  PERFORM pg_notify('scrum4me_changes', payload::text);
+  RETURN rec;
+END;
+$$ LANGUAGE plpgsql;
diff --git a/stores/solo-store.ts b/stores/solo-store.ts
index d4ff93c..961716c 100644
--- a/stores/solo-store.ts
+++ b/stores/solo-store.ts
@@ -3,8 +3,9 @@ import type { SoloTask } from '@/components/solo/solo-board'
 
 type TaskStatus = SoloTask['status']
 
-// Payload-shape gepubliceerd door de Postgres-trigger via pg_notify (ST-801).
-// Komt het Solo Paneel binnen via de SSE-stream uit /api/realtime/solo (ST-802).
+// Payload-shape gepubliceerd door de Postgres-trigger via pg_notify (ST-801
+// + ST-804 prereq). Komt het Solo Paneel binnen via de SSE-stream uit
+// /api/realtime/solo (ST-802).
 export interface RealtimeEvent {
   op: 'I' | 'U' | 'D'
   entity: 'task' | 'story'
@@ -13,22 +14,40 @@ export interface RealtimeEvent {
   product_id: string
   sprint_id: string | null
   assignee_id: string | null
+  // Task-specifieke velden (alleen aanwezig als entity === 'task')
+  task_status?: TaskStatus
+  task_sort_order?: number
+  task_title?: string
+  // Story-specifieke velden (alleen aanwezig als entity === 'story')
+  story_status?: 'OPEN' | 'IN_SPRINT' | 'DONE'
+  story_sort_order?: number
+  story_title?: string
+  story_code?: string | null
+  // Op UPDATE: lijst van kolommen die zijn veranderd
   changed_fields?: string[]
 }
 
 interface SoloStore {
   tasks: Record<string, SoloTask>
+  /** Task-ids die op dit moment een eigen optimistic write in de lucht hebben.
+   *  Realtime echos voor deze ids worden onderdrukt zodat de eigen update niet
+   *  twee keer toegepast wordt of door een latere echo overschreven. */
+  pendingOps: Set<string>
+
   initTasks: (tasks: SoloTask[]) => void
   optimisticMove: (taskId: string, toStatus: TaskStatus) => TaskStatus | null
   rollback: (taskId: string, prevStatus: TaskStatus) => void
   updatePlan: (taskId: string, plan: string | null) => void
-  // ST-803 stub. Echte implementatie in ST-804 met pendingOps en
-  // gedifferentieerde apply{Task,Story}{Update,Create,Delete}.
+
+  markPending: (taskId: string) => void
+  clearPending: (taskId: string) => void
+
   handleRealtimeEvent: (event: RealtimeEvent) => void
 }
 
 export const useSoloStore = create<SoloStore>((set, get) => ({
   tasks: {},
+  pendingOps: new Set<string>(),
 
   initTasks: (tasks) =>
     set({ tasks: Object.fromEntries(tasks.map(t => [t.id, t])) }),
@@ -46,7 +65,107 @@ export const useSoloStore = create<SoloStore>((set, get) => ({
   updatePlan: (taskId, plan) =>
     set((s) => ({ tasks: { ...s.tasks, [taskId]: { ...s.tasks[taskId], implementation_plan: plan } } })),
 
-  handleRealtimeEvent: (_event) => {
-    // ST-803 stub — vol invullen in ST-804.
+  markPending: (taskId) =>
+    set((s) => {
+      if (s.pendingOps.has(taskId)) return s
+      const next = new Set(s.pendingOps)
+      next.add(taskId)
+      return { pendingOps: next }
+    }),
+
+  clearPending: (taskId) =>
+    set((s) => {
+      if (!s.pendingOps.has(taskId)) return s
+      const next = new Set(s.pendingOps)
+      next.delete(taskId)
+      return { pendingOps: next }
+    }),
+
+  handleRealtimeEvent: (event) => {
+    if (event.entity === 'task') {
+      const { id, op } = event
+
+      if (op === 'D') {
+        set((s) => {
+          if (!(id in s.tasks)) return s
+          const next = { ...s.tasks }
+          delete next[id]
+          return { tasks: next }
+        })
+        return
+      }
+
+      // INSERT en UPDATE: alleen bestaande taken bijwerken. Nieuwe taken
+      // zonder story-context (story_title, story_code) renderen we niet
+      // — gebruiker ziet ze pas na een refresh. Acceptabel voor v1.
+      const existing = get().tasks[id]
+      if (!existing) return
+
+      if (get().pendingOps.has(id)) {
+        // Echo van een eigen optimistic move — laat de optimistic-state staan
+        return
+      }
+
+      const updates: Partial<SoloTask> = {}
+      if (event.task_status !== undefined && event.task_status !== existing.status) {
+        updates.status = event.task_status
+      }
+      if (
+        event.task_sort_order !== undefined &&
+        event.task_sort_order !== existing.sort_order
+      ) {
+        updates.sort_order = event.task_sort_order
+      }
+      if (event.task_title !== undefined && event.task_title !== existing.title) {
+        updates.title = event.task_title
+      }
+
+      if (Object.keys(updates).length === 0) return
+      set((s) => ({ tasks: { ...s.tasks, [id]: { ...s.tasks[id], ...updates } } }))
+      return
+    }
+
+    if (event.entity === 'story') {
+      const { id, op } = event
+
+      if (op === 'D') {
+        // Story-cascade pakt tasks ook in de DB; verwijder de bijbehorende
+        // SoloTask-records uit de store.
+        set((s) => {
+          const next: Record<string, SoloTask> = {}
+          for (const [taskId, task] of Object.entries(s.tasks)) {
+            if (task.story_id !== id) next[taskId] = task
+          }
+          return { tasks: next }
+        })
+        return
+      }
+
+      const tasks = get().tasks
+      const affectedIds = Object.entries(tasks)
+        .filter(([, t]) => t.story_id === id)
+        .map(([taskId]) => taskId)
+
+      if (affectedIds.length === 0) return
+
+      const newTitle = event.story_title
+      const newCode = event.story_code ?? null
+
+      set((s) => {
+        const next = { ...s.tasks }
+        for (const taskId of affectedIds) {
+          const t = next[taskId]
+          const titleChanged = newTitle !== undefined && t.story_title !== newTitle
+          const codeChanged = newCode !== t.story_code
+          if (!titleChanged && !codeChanged) continue
+          next[taskId] = {
+            ...t,
+            ...(titleChanged && newTitle !== undefined && { story_title: newTitle }),
+            ...(codeChanged && { story_code: newCode }),
+          }
+        }
+        return { tasks: next }
+      })
+    }
   },
 }))