diff --git a/frontend/src/lib/server/migrate.ts b/frontend/src/lib/server/migrate.ts
index ab7af7f..bd62f7d 100644
--- a/frontend/src/lib/server/migrate.ts
+++ b/frontend/src/lib/server/migrate.ts
@@ -1166,11 +1166,12 @@ async function seedDemoCompletions(): Promise<void> {
 	const startDate = addDays(todayDate, -20);
 
 	// Track per-member-per-week totals for weekly_history
-	type WeekKey = string; // "YYYY-MM-DD" (Monday)
+	type WeekKey = string; // "YYYY-MM-DD" (week start: day after payday)
 	const weekTotals: Record<
 		string,
 		Record<string, { points: number; money: number; count: number }>
 	> = {};
+	const demoPayday = fam.payday ?? 1;
 
 	for (const member of members) {
 		const profile = COMPLETION_PROFILES[member.name] || COMPLETION_PROFILES['Jalipo'];
@@ -1180,10 +1181,14 @@ async function seedDemoCompletions(): Promise<void> {
 			const ds = dateStr(day);
 			const dow = day.getUTCDay(); // 0=Sun
 
-			// Compute week start (Monday) for weekly_history tracking
-			const weekMonday = new Date(day);
-			weekMonday.setUTCDate(weekMonday.getUTCDate() - ((weekMonday.getUTCDay() + 6) % 7));
-			const ws = dateStr(weekMonday);
+			// Compute week start (payday-anchored: weeks close on payday, so
+			// the bucket opens the day after — same rule as weekStart()).
+			const dowNum = day.getUTCDay(); // 0=Sun
+			const sincePayday = (((dowNum - demoPayday) % 7) + 7) % 7;
+			const back = sincePayday === 0 ? 6 : sincePayday - 1;
+			const wsDay = new Date(day);
+			wsDay.setUTCDate(wsDay.getUTCDate() - back);
+			const ws = dateStr(wsDay);
 
 			if (!weekTotals[member.id]) weekTotals[member.id] = {};
 			if (!weekTotals[member.id][ws]) weekTotals[member.id][ws] = { points: 0, money: 0, count: 0 };
@@ -1196,8 +1201,9 @@ async function seedDemoCompletions(): Promise<void> {
 			);
 
 			for (const chore of memberChores) {
-				// Weekly chores: only complete on Monday (dow=1)
-				if (chore.frequency === 'weekly' && dow !== 1) continue;
+				// Weekly chores: only complete on the week's first day
+				// (day after payday).
+				if (chore.frequency === 'weekly' && dow !== (demoPayday + 1) % 7) continue;
 
 				const prob = dayProfile[chore.customName] || dayProfile.default;
 				const rng = demoRng(