diff --git a/frontend/src/hooks.server.ts b/frontend/src/hooks.server.ts
index 18c3d63..45ff7ff 100644
--- a/frontend/src/hooks.server.ts
+++ b/frontend/src/hooks.server.ts
@@ -89,9 +89,15 @@ export const handle: Handle = async ({ event, resolve }) => {
 					setActiveChild(event.cookies, activeId);
 					return resolve(event);
 				}
-			} catch {
+				console.error(
+					`[diag] hooks child wrong-role activeId=${activeId} role=${record.role} path=${event.url.pathname}`
+				);
+			} catch (e) {
 				// Expired/revoked/malformed — leave the cookie; the picker switch
 				// re-mints it server-side. Fall through to the single session.
+				console.error(
+					`[diag] hooks child authRefresh-fail activeId=${activeId} path=${event.url.pathname} err=${e instanceof Error ? e.message : e}`
+				);
 			}
 		}
 	}
@@ -109,8 +115,11 @@ export const handle: Handle = async ({ event, resolve }) => {
 			if (freshToken !== token) {
 				setSessionCookie(event.cookies, freshToken);
 			}
-		} catch {
+		} catch (e) {
 			// Expired, malformed, or revoked — drop it and treat as logged out.
+			console.error(
+				`[diag] hooks single authRefresh-fail path=${event.url.pathname} err=${e instanceof Error ? e.message : e}`
+			);
 			clearSessionCookie(event.cookies);
 		}
 	}
diff --git a/frontend/src/lib/server/services/completions.ts b/frontend/src/lib/server/services/completions.ts
index 41c38cc..cf2e2f9 100644
--- a/frontend/src/lib/server/services/completions.ts
+++ b/frontend/src/lib/server/services/completions.ts
@@ -67,10 +67,16 @@ export async function toggle(pb: any, famId: string, memberId: string, body: { a
 	let chore: any;
 	try {
 		chore = await pbAdmin.getOne('assigned_chores', assignedChoreId);
-	} catch {
+	} catch (e) {
+		console.error(
+			`[diag] toggle CHORE_GONE(getOne-fail) member=${memberId} fam=${famId} chore=${assignedChoreId} date=${date} err=${e instanceof Error ? e.message : e}`
+		);
 		throw new Error('CHORE_GONE: this chore was changed — refresh to get the latest list');
 	}
 	if (!chore || chore.famId !== famId) {
+		console.error(
+			`[diag] toggle CHORE_GONE(fam-mismatch) member=${memberId} sessionFam=${famId} chore=${assignedChoreId} choreFam=${chore?.famId} choreMember=${chore?.memberId} date=${date}`
+		);
 		throw new Error('CHORE_GONE: this chore was changed — refresh to get the latest list');
 	}
 	const isTodo = chore?.isTodo;
diff --git a/frontend/src/routes/api/completions/toggle/+server.ts b/frontend/src/routes/api/completions/toggle/+server.ts
index 0b1fe7e..e8ff735 100644
--- a/frontend/src/routes/api/completions/toggle/+server.ts
+++ b/frontend/src/routes/api/completions/toggle/+server.ts
@@ -5,13 +5,23 @@ import { createServices } from '$lib/server/services';
 
 export async function POST(event: RequestEvent) {
 	const u = event.locals.user;
-	if (!u || !event.locals.pbToken) throw error(401, 'Unauthorized');
+	if (!u || !event.locals.pbToken) {
+		console.error(`[diag] toggle 401 role=${u?.role} hasToken=${!!event.locals.pbToken}`);
+		throw error(401, 'Unauthorized');
+	}
 	const pb = createPbClient(event.locals.pbToken);
 	const body = await event.request.json().catch(() => ({}));
 	try {
 		const s = createServices(pb, { id: u.id, role: u.role });
-		return json(await s.completions.toggle(u.famId, body));
+		const out = await s.completions.toggle(u.famId, body);
+		console.log(
+			`[diag] toggle ok member=${u.id} chore=${body.assignedChoreId} date=${body.date} completed=${(out as any)?.completed}`
+		);
+		return json(out);
 	} catch (e) {
+		console.error(
+			`[diag] toggle 400 member=${u.id} role=${u.role} fam=${u.famId} chore=${body.assignedChoreId} date=${body.date} err=${e instanceof Error ? e.message : e}`
+		);
 		return json({ error: e instanceof Error ? e.message : 'toggle failed' }, { status: 400 });
 	}
 }
\ No newline at end of file
diff --git a/frontend/src/routes/api/debug/chore/+server.ts b/frontend/src/routes/api/debug/chore/+server.ts
new file mode 100644
index 0000000..a46c80d
--- /dev/null
+++ b/frontend/src/routes/api/debug/chore/+server.ts
@@ -0,0 +1,52 @@
+import { json, error } from '@sveltejs/kit';
+import type { RequestEvent } from '@sveltejs/kit';
+import { createPbClient, pbAdmin } from '$lib/server/pocketbase';
+
+// TEMP diagnostic for the recurring prod CHORE_GONE. Compares what the client
+// claims against server truth from both angles (superuser getOne — the toggle
+// path — and the user's own list read — the kanban path). Authenticated,
+// own-fam only, no tokens ever logged or returned.
+export async function GET(event: RequestEvent) {
+	const u = event.locals.user;
+	if (!u || !event.locals.pbToken) throw error(401, 'Unauthorized');
+	const assignedChoreId = event.url.searchParams.get('assignedChoreId') || '';
+
+	let suChore: any = null;
+	let suError = '';
+	if (assignedChoreId) {
+		try {
+			suChore = await pbAdmin.getOne('assigned_chores', assignedChoreId);
+		} catch (e) {
+			suError = e instanceof Error ? e.message : String(e);
+		}
+	}
+
+	let userSeesIt: boolean | null = null;
+	let userListError = '';
+	try {
+		const pb = createPbClient(event.locals.pbToken);
+		const list = await pb
+			.collection('assigned_chores')
+			.getFullList({ filter: `famId = '${u.famId}'` });
+		if (assignedChoreId) userSeesIt = list.some((a: any) => a.id === assignedChoreId);
+	} catch (e) {
+		userListError = e instanceof Error ? e.message : String(e);
+	}
+
+	const out = {
+		session: { id: u.id, role: u.role, famId: u.famId },
+		asked: assignedChoreId,
+		superuser: suChore
+			? {
+					found: true,
+					famId: suChore.famId,
+					memberId: suChore.memberId,
+					isTodo: !!suChore.isTodo,
+					famMatch: suChore.famId === u.famId
+				}
+			: { found: false, error: suError },
+		userList: { seesIt: userSeesIt, error: userListError }
+	};
+	console.log(`[diag] debug-chore ${JSON.stringify(out)}`);
+	return json(out);
+}
diff --git a/frontend/src/routes/api/todos/+server.ts b/frontend/src/routes/api/todos/+server.ts
index 6a34e1b..9aac115 100644
--- a/frontend/src/routes/api/todos/+server.ts
+++ b/frontend/src/routes/api/todos/+server.ts
@@ -10,7 +10,10 @@ import { weekStart, addDaysStr, todayInTz, resolveTz } from '@shared/timezone';
 // frequency, this-week start/completeBy (so it expires and purges naturally).
 export async function POST(event: RequestEvent) {
 	const u = event.locals.user;
-	if (!u) throw error(401, 'Unauthorized');
+	if (!u) {
+		console.error('[diag] todos 401 (no session)');
+		throw error(401, 'Unauthorized');
+	}
 	const body = await event.request.json().catch(() => ({}));
 	const name = typeof body.name === 'string' ? body.name.trim().slice(0, 80) : '';
 	if (!name) throw error(400, 'Give your todo a name');
@@ -43,8 +46,12 @@ export async function POST(event: RequestEvent) {
 			startDate: today,
 			completeBy
 		});
+		console.log(`[diag] todo ok member=${u.id} fam=${u.famId} todo=${record.id} name=${name}`);
 		return json({ record });
 	} catch (e) {
+		console.error(
+			`[diag] todo 400 member=${u.id} role=${u.role} fam=${u.famId} name=${name} err=${e instanceof Error ? e.message : e}`
+		);
 		throw error(400, e instanceof Error ? e.message : 'Could not add todo');
 	}
 }