diff --git a/apps/mana/apps/web/src/lib/data/ai/agents/bootstrap.ts b/apps/mana/apps/web/src/lib/data/ai/agents/bootstrap.ts
index 8d8d6ccf0..002da78cb 100644
--- a/apps/mana/apps/web/src/lib/data/ai/agents/bootstrap.ts
+++ b/apps/mana/apps/web/src/lib/data/ai/agents/bootstrap.ts
@@ -27,6 +27,7 @@ import { encryptRecord } from '../../crypto';
 import type { Mission } from '../missions/types';
 import { MISSIONS_TABLE } from '../missions/types';
 import { getActiveSpace } from '../../scope/active-space.svelte';
+import { getEffectiveSpaceId } from '../../scope/scoped-db';
 import { DEFAULT_AI_POLICY } from '../policy';
 import { getAgent } from './store';
 import type { Agent } from './types';
@@ -105,7 +106,7 @@ export async function ensureDefaultAgent(): Promise<Agent> {
 	const toWrite: Agent = { ...agent };
 	await encryptRecord(AGENTS_TABLE, toWrite);
 	try {
-		await db.table(AGENTS_TABLE).add(toWrite);
+		await db.table(AGENTS_TABLE).add({ ...toWrite, spaceId: getEffectiveSpaceId() });
 	} catch (err) {
 		// Race: another tab just wrote the same id. Re-fetch and return
 		// that tab's record.
diff --git a/apps/mana/apps/web/src/lib/data/ai/agents/kontext.ts b/apps/mana/apps/web/src/lib/data/ai/agents/kontext.ts
index 9d6eaf545..5300f95e8 100644
--- a/apps/mana/apps/web/src/lib/data/ai/agents/kontext.ts
+++ b/apps/mana/apps/web/src/lib/data/ai/agents/kontext.ts
@@ -9,6 +9,7 @@
 
 import { db } from '../../database';
 import { encryptRecord, decryptRecords } from '../../crypto';
+import { getEffectiveSpaceId } from '../../scope/scoped-db';
 
 const TABLE = 'agentKontextDocs';
 
@@ -65,6 +66,6 @@ export async function saveAgentKontext(agentId: string, content: string): Promis
 			content,
 		};
 		await encryptRecord(TABLE, doc);
-		await db.table<LocalAgentKontextDoc>(TABLE).add(doc);
+		await db.table(TABLE).add({ ...doc, spaceId: getEffectiveSpaceId() });
 	}
 }
diff --git a/apps/mana/apps/web/src/lib/data/scope/index.ts b/apps/mana/apps/web/src/lib/data/scope/index.ts
index 54ed56afb..5634722e6 100644
--- a/apps/mana/apps/web/src/lib/data/scope/index.ts
+++ b/apps/mana/apps/web/src/lib/data/scope/index.ts
@@ -29,6 +29,7 @@ export {
 	scopedGet,
 	assertModuleAllowed,
 	getInScopeSpaceIds,
+	getEffectiveSpaceId,
 	ScopeNotReadyError,
 	ModuleNotInSpaceError,
 } from './scoped-db';
diff --git a/apps/mana/apps/web/src/lib/data/scope/scoped-db.ts b/apps/mana/apps/web/src/lib/data/scope/scoped-db.ts
index 5ced28151..f9d6b0b3e 100644
--- a/apps/mana/apps/web/src/lib/data/scope/scoped-db.ts
+++ b/apps/mana/apps/web/src/lib/data/scope/scoped-db.ts
@@ -66,6 +66,25 @@ export function getInScopeSpaceIds(): string[] {
 	return [sentinel];
 }
 
+/**
+ * The spaceId every new write to a space-scoped table should carry.
+ * Returns the active Space's id when one is loaded, falling back to the
+ * personal sentinel `_personal:<userId>` for guests / pre-bootstrap
+ * windows. The sentinel value matches what `reconcileSentinels` rewrites
+ * to the real personal-space id once `loadActiveSpace` resolves, so no
+ * row gets stranded.
+ *
+ * Module stores call this and stamp `spaceId` on the record explicitly
+ * before `.add()` / `.put()`. Once Schicht A flips the creating-hook to
+ * throw on missing spaceId (see docs/plans/workbench-seeding-cleanup.md),
+ * forgetting this call is a hard error instead of silent corruption.
+ */
+export function getEffectiveSpaceId(): string {
+	const active = getActiveSpaceId();
+	if (active) return active;
+	return personalSpaceSentinel(getEffectiveUserId());
+}
+
 /**
  * Return a Collection that applies the space filter — chainable with any
  * further `.where()`, `.filter()`, `.toArray()`, `.modify()`.
diff --git a/apps/mana/apps/web/src/lib/modules/calc/stores/calculations.svelte.ts b/apps/mana/apps/web/src/lib/modules/calc/stores/calculations.svelte.ts
index 60da43def..1643030b4 100644
--- a/apps/mana/apps/web/src/lib/modules/calc/stores/calculations.svelte.ts
+++ b/apps/mana/apps/web/src/lib/modules/calc/stores/calculations.svelte.ts
@@ -4,17 +4,19 @@
 
 import { db } from '$lib/data/database';
 import { CalcEvents } from '@mana/shared-utils/analytics';
+import { getEffectiveSpaceId } from '$lib/data/scope';
 import type { LocalCalculation } from '../types';
 import type { CreateCalculationInput } from '@calc/shared';
 
 export const calculationsStore = {
 	async addCalculation(input: CreateCalculationInput) {
-		await db.table<LocalCalculation>('calculations').add({
+		await db.table('calculations').add({
 			id: crypto.randomUUID(),
 			mode: input.mode,
 			expression: input.expression,
 			result: input.result,
 			skin: input.skin,
+			spaceId: getEffectiveSpaceId(),
 			createdAt: new Date().toISOString(),
 			updatedAt: new Date().toISOString(),
 		});
diff --git a/apps/mana/apps/web/src/lib/modules/calc/stores/saved-formulas.svelte.ts b/apps/mana/apps/web/src/lib/modules/calc/stores/saved-formulas.svelte.ts
index 79bae1ed8..940e0e81d 100644
--- a/apps/mana/apps/web/src/lib/modules/calc/stores/saved-formulas.svelte.ts
+++ b/apps/mana/apps/web/src/lib/modules/calc/stores/saved-formulas.svelte.ts
@@ -4,17 +4,19 @@
 
 import { db } from '$lib/data/database';
 import { CalcEvents } from '@mana/shared-utils/analytics';
+import { getEffectiveSpaceId } from '$lib/data/scope';
 import type { LocalSavedFormula } from '../types';
 import type { CreateFormulaInput, UpdateFormulaInput } from '@calc/shared';
 
 export const savedFormulasStore = {
 	async saveFormula(input: CreateFormulaInput) {
-		await db.table<LocalSavedFormula>('savedFormulas').add({
+		await db.table('savedFormulas').add({
 			id: crypto.randomUUID(),
 			name: input.name,
 			expression: input.expression,
 			description: input.description ?? null,
 			mode: input.mode,
+			spaceId: getEffectiveSpaceId(),
 			createdAt: new Date().toISOString(),
 			updatedAt: new Date().toISOString(),
 		});
diff --git a/apps/mana/apps/web/src/lib/modules/companion/stores/chat.svelte.ts b/apps/mana/apps/web/src/lib/modules/companion/stores/chat.svelte.ts
index a1a9f9850..e499a6bfc 100644
--- a/apps/mana/apps/web/src/lib/modules/companion/stores/chat.svelte.ts
+++ b/apps/mana/apps/web/src/lib/modules/companion/stores/chat.svelte.ts
@@ -8,6 +8,7 @@
 
 import { db } from '$lib/data/database';
 import { emitDomainEvent } from '$lib/data/events';
+import { getEffectiveSpaceId } from '$lib/data/scope';
 import type { LocalConversation, LocalMessage } from '../types';
 
 const CONV_TABLE = 'companionConversations';
@@ -24,7 +25,7 @@ export const chatStore = {
 			createdAt: now,
 			updatedAt: now,
 		};
-		await db.table<LocalConversation>(CONV_TABLE).add(conv);
+		await db.table(CONV_TABLE).add({ ...conv, spaceId: getEffectiveSpaceId() });
 		emitDomainEvent('CompanionConversationStarted', 'companion', CONV_TABLE, conv.id, {
 			conversationId: conv.id,
 			title: conv.title,
@@ -66,7 +67,7 @@ export const chatStore = {
 			toolResult: extra?.toolResult,
 			createdAt: new Date().toISOString(),
 		};
-		await db.table<LocalMessage>(MSG_TABLE).add(msg);
+		await db.table(MSG_TABLE).add({ ...msg, spaceId: getEffectiveSpaceId() });
 
 		// Touch conversation updatedAt
 		await db.table<LocalConversation>(CONV_TABLE).update(conversationId, {
diff --git a/apps/mana/apps/web/src/lib/modules/events/stores/guests.svelte.ts b/apps/mana/apps/web/src/lib/modules/events/stores/guests.svelte.ts
index fce43f15d..f982dbe84 100644
--- a/apps/mana/apps/web/src/lib/modules/events/stores/guests.svelte.ts
+++ b/apps/mana/apps/web/src/lib/modules/events/stores/guests.svelte.ts
@@ -4,6 +4,7 @@
 
 import { db } from '$lib/data/database';
 import { encryptRecord } from '$lib/data/crypto';
+import { getEffectiveSpaceId } from '$lib/data/scope';
 import type { LocalEventGuest, RsvpStatus } from '../types';
 
 let error = $state<string | null>(null);
@@ -44,7 +45,7 @@ export const eventGuestsStore = {
 			// records stay local-only — they're never pushed to the
 			// public RSVP snapshot, so no decrypt-before-publish here.
 			await encryptRecord('eventGuests', newGuest);
-			await db.table<LocalEventGuest>('eventGuests').add(newGuest);
+			await db.table('eventGuests').add({ ...newGuest, spaceId: getEffectiveSpaceId() });
 			return { success: true as const, id };
 		} catch (e) {
 			error = e instanceof Error ? e.message : 'Failed to add guest';
diff --git a/apps/mana/apps/web/src/lib/modules/events/stores/items.svelte.ts b/apps/mana/apps/web/src/lib/modules/events/stores/items.svelte.ts
index 2ce6146b0..2f565f5e9 100644
--- a/apps/mana/apps/web/src/lib/modules/events/stores/items.svelte.ts
+++ b/apps/mana/apps/web/src/lib/modules/events/stores/items.svelte.ts
@@ -4,6 +4,7 @@
  */
 
 import { db } from '$lib/data/database';
+import { getEffectiveSpaceId } from '$lib/data/scope';
 import type { LocalEventItem } from '../types';
 import { eventsStore } from './events.svelte';
 
@@ -47,7 +48,7 @@ export const eventItemsStore = {
 				createdAt: new Date().toISOString(),
 				updatedAt: new Date().toISOString(),
 			};
-			await db.table<LocalEventItem>('eventItems').add(newItem);
+			await db.table('eventItems').add({ ...newItem, spaceId: getEffectiveSpaceId() });
 			void eventsStore.syncItems(input.eventId);
 			return { success: true as const, id };
 		} catch (e) {
diff --git a/apps/mana/apps/web/src/lib/modules/moodlit/stores/moods.svelte.ts b/apps/mana/apps/web/src/lib/modules/moodlit/stores/moods.svelte.ts
index 02458f5c3..d5a9d4d80 100644
--- a/apps/mana/apps/web/src/lib/modules/moodlit/stores/moods.svelte.ts
+++ b/apps/mana/apps/web/src/lib/modules/moodlit/stores/moods.svelte.ts
@@ -5,6 +5,7 @@
 import { db } from '$lib/data/database';
 import { MoodlitEvents } from '@mana/shared-utils/analytics';
 import { createBlock, updateBlock } from '$lib/data/time-blocks/service';
+import { getEffectiveSpaceId } from '$lib/data/scope';
 import type { LocalMood } from '../types';
 import type { Mood, MoodSettings } from '../types';
 
@@ -128,12 +129,13 @@ function createMoodsStore() {
 
 		// IndexedDB mutation methods
 		async createMood(data: { name: string; colors: string[]; animation: string }) {
-			await db.table<LocalMood>('moods').add({
+			await db.table('moods').add({
 				id: crypto.randomUUID(),
 				name: data.name,
 				colors: data.colors,
 				animation: data.animation,
 				isDefault: false,
+				spaceId: getEffectiveSpaceId(),
 				createdAt: new Date().toISOString(),
 				updatedAt: new Date().toISOString(),
 			});
diff --git a/apps/mana/apps/web/src/lib/modules/picture/stores/boards.svelte.ts b/apps/mana/apps/web/src/lib/modules/picture/stores/boards.svelte.ts
index 365ff25bb..80b7bc779 100644
--- a/apps/mana/apps/web/src/lib/modules/picture/stores/boards.svelte.ts
+++ b/apps/mana/apps/web/src/lib/modules/picture/stores/boards.svelte.ts
@@ -9,7 +9,7 @@
 import { db } from '$lib/data/database';
 import { encryptRecord, decryptRecord } from '$lib/data/crypto';
 import { emitDomainEvent } from '$lib/data/events';
-import { getActiveSpace } from '$lib/data/scope';
+import { getActiveSpace, getEffectiveSpaceId } from '$lib/data/scope';
 import { getEffectiveUserId } from '$lib/data/current-user';
 import {
 	defaultVisibilityFor,
@@ -56,7 +56,7 @@ export const boardsStore = {
 			// mutates `newLocal` in place — UI consumers expect plaintext.
 			const plaintextSnapshot = toBoard({ ...newLocal });
 			await encryptRecord('boards', newLocal);
-			await db.table<LocalBoard>('boards').add(newLocal);
+			await db.table('boards').add({ ...newLocal, spaceId: getEffectiveSpaceId() });
 			return { success: true, data: plaintextSnapshot };
 		} catch (e) {
 			error = e instanceof Error ? e.message : 'Failed to create board';
@@ -170,7 +170,7 @@ export const boardsStore = {
 					updatedAt: now,
 				};
 				await encryptRecord('boardItems', newItem);
-				await db.table<LocalBoardItem>('boardItems').add(newItem);
+				await db.table('boardItems').add({ ...newItem, spaceId: getEffectiveSpaceId() });
 			}
 
 			return { success: true, data: plaintextSnapshot };
diff --git a/apps/mana/apps/web/src/lib/modules/plants/mutations.ts b/apps/mana/apps/web/src/lib/modules/plants/mutations.ts
index 685c5b792..e92311f79 100644
--- a/apps/mana/apps/web/src/lib/modules/plants/mutations.ts
+++ b/apps/mana/apps/web/src/lib/modules/plants/mutations.ts
@@ -11,6 +11,7 @@ import { PlantsEvents } from '@mana/shared-utils/analytics';
 import { encryptRecord, decryptRecord } from '$lib/data/crypto';
 import { emitDomainEvent } from '$lib/data/events';
 import { createBlock } from '$lib/data/time-blocks/service';
+import { getEffectiveSpaceId } from '$lib/data/scope';
 import { uploadPlantPhoto, identifyPlant, type IdentifyResult } from './api';
 import type {
 	LocalPlant,
@@ -194,6 +195,7 @@ export const wateringMutations = {
 				nextWateringAt: nextDate.toISOString(),
 				reminderEnabled: false,
 				reminderHoursBefore: 0,
+				spaceId: getEffectiveSpaceId(),
 				createdAt: now,
 				updatedAt: now,
 			});
diff --git a/apps/mana/apps/web/src/lib/modules/questions/stores/answers.svelte.ts b/apps/mana/apps/web/src/lib/modules/questions/stores/answers.svelte.ts
index e037eb216..84a21428f 100644
--- a/apps/mana/apps/web/src/lib/modules/questions/stores/answers.svelte.ts
+++ b/apps/mana/apps/web/src/lib/modules/questions/stores/answers.svelte.ts
@@ -22,6 +22,7 @@
 import { db } from '$lib/data/database';
 import { encryptRecord, decryptRecord } from '$lib/data/crypto';
 import { emitDomainEvent } from '$lib/data/events';
+import { getEffectiveSpaceId } from '$lib/data/scope';
 import { researchApi, type ResearchEvent, type ResearchSource } from '$lib/api/research';
 import type { LocalAnswer, LocalQuestion } from '../types';
 
@@ -43,6 +44,7 @@ async function createManual(input: CreateManualAnswerInput): Promise<string> {
 		citations: [],
 		rating: null,
 		isAccepted: false,
+		spaceId: getEffectiveSpaceId(),
 		createdAt: now,
 		updatedAt: now,
 	};
@@ -108,6 +110,7 @@ async function startResearch(opts: StartResearchOptions): Promise<ResearchHandle
 		citations: [],
 		rating: null,
 		isAccepted: false,
+		spaceId: getEffectiveSpaceId(),
 		createdAt: now,
 		updatedAt: now,
 	};
diff --git a/apps/mana/apps/web/src/lib/modules/quotes/stores/custom-quotes.svelte.ts b/apps/mana/apps/web/src/lib/modules/quotes/stores/custom-quotes.svelte.ts
index cea44fd96..bceec0dbe 100644
--- a/apps/mana/apps/web/src/lib/modules/quotes/stores/custom-quotes.svelte.ts
+++ b/apps/mana/apps/web/src/lib/modules/quotes/stores/custom-quotes.svelte.ts
@@ -4,6 +4,7 @@
  */
 
 import { db } from '$lib/data/database';
+import { getEffectiveSpaceId } from '$lib/data/scope';
 import type { LocalCustomQuote } from '../types';
 
 export interface CustomQuoteInput {
@@ -18,13 +19,14 @@ export const customQuotesStore = {
 	async create(input: CustomQuoteInput): Promise<string> {
 		const now = new Date().toISOString();
 		const id = `custom-${crypto.randomUUID()}`;
-		await db.table<LocalCustomQuote>('customQuotes').add({
+		await db.table('customQuotes').add({
 			id,
 			text: input.text,
 			author: input.author,
 			category: input.category ?? null,
 			source: input.source ?? null,
 			year: input.year ?? null,
+			spaceId: getEffectiveSpaceId(),
 			createdAt: now,
 			updatedAt: now,
 		});
diff --git a/apps/mana/apps/web/src/lib/modules/quotes/stores/favorites.svelte.ts b/apps/mana/apps/web/src/lib/modules/quotes/stores/favorites.svelte.ts
index 5f9813e2c..796b55781 100644
--- a/apps/mana/apps/web/src/lib/modules/quotes/stores/favorites.svelte.ts
+++ b/apps/mana/apps/web/src/lib/modules/quotes/stores/favorites.svelte.ts
@@ -5,15 +5,17 @@
  */
 
 import { db } from '$lib/data/database';
+import { getEffectiveSpaceId } from '$lib/data/scope';
 import type { LocalFavorite } from '../types';
 import type { Favorite } from '../queries';
 
 export const favoritesStore = {
 	async add(quoteId: string) {
 		const now = new Date().toISOString();
-		await db.table<LocalFavorite>('quotesFavorites').add({
+		await db.table('quotesFavorites').add({
 			id: crypto.randomUUID(),
 			quoteId,
+			spaceId: getEffectiveSpaceId(),
 			createdAt: now,
 			updatedAt: now,
 		});
diff --git a/apps/mana/apps/web/src/lib/modules/skilltree/stores/achievements.svelte.ts b/apps/mana/apps/web/src/lib/modules/skilltree/stores/achievements.svelte.ts
index 21159e78a..94991b27c 100644
--- a/apps/mana/apps/web/src/lib/modules/skilltree/stores/achievements.svelte.ts
+++ b/apps/mana/apps/web/src/lib/modules/skilltree/stores/achievements.svelte.ts
@@ -6,6 +6,7 @@
  */
 
 import { db } from '$lib/data/database';
+import { getEffectiveSpaceId } from '$lib/data/scope';
 import type {
 	AchievementWithStatus,
 	AchievementUnlockResult,
@@ -95,13 +96,14 @@ async function seedIfEmpty() {
 	const active = stored.filter((a) => !a.deletedAt);
 	if (active.length === 0) {
 		for (const def of ACHIEVEMENT_DEFINITIONS) {
-			await db.table<LocalAchievement>('achievements').add({
+			await db.table('achievements').add({
 				id: def.id,
 				key: def.id,
 				name: def.name,
 				description: def.description,
 				icon: def.icon,
 				unlockedAt: '',
+				spaceId: getEffectiveSpaceId(),
 				createdAt: new Date().toISOString(),
 				updatedAt: new Date().toISOString(),
 			});
diff --git a/apps/mana/apps/web/src/lib/modules/skilltree/stores/skills.svelte.ts b/apps/mana/apps/web/src/lib/modules/skilltree/stores/skills.svelte.ts
index 8c633aff2..53415d45a 100644
--- a/apps/mana/apps/web/src/lib/modules/skilltree/stores/skills.svelte.ts
+++ b/apps/mana/apps/web/src/lib/modules/skilltree/stores/skills.svelte.ts
@@ -7,6 +7,7 @@
 
 import { db } from '$lib/data/database';
 import { emitDomainEvent } from '$lib/data/events';
+import { getEffectiveSpaceId } from '$lib/data/scope';
 import type { Skill } from '../types';
 import { calculateLevel, createDefaultSkill, createActivity } from '../types';
 import type { LocalSkill, LocalActivity } from '../types';
@@ -29,8 +30,9 @@ async function addSkill(data: Partial<Skill>): Promise<Skill> {
 		totalXp: skill.totalXp,
 		level: skill.level,
 	};
-	await db.table<LocalSkill>('skills').add({
+	await db.table('skills').add({
 		...localSkill,
+		spaceId: getEffectiveSpaceId(),
 		createdAt: new Date().toISOString(),
 		updatedAt: new Date().toISOString(),
 	});