diff --git a/server/internal/store/sqlite_migrate_test.go b/server/internal/store/sqlite_migrate_test.go
index 7f37920..0323a91 100644
--- a/server/internal/store/sqlite_migrate_test.go
+++ b/server/internal/store/sqlite_migrate_test.go
@@ -50,6 +50,19 @@ func TestSQLiteMigrateUpDown(t *testing.T) {
 		}
 	}
 
+	// 2b. idx_subs_user_exp survives the 000024 subscriptions table rebuild
+	// (SQLite table-rebuild migrations silently drop indexes unless recreated;
+	// this guards against that regression — see 000024_invite_rewards.{up,down}.sql).
+	var idxCount int
+	if err := db.QueryRow(
+		`SELECT COUNT(*) FROM sqlite_master WHERE type='index' AND name='idx_subs_user_exp'`,
+	).Scan(&idxCount); err != nil {
+		t.Fatalf("query idx_subs_user_exp: %v", err)
+	}
+	if idxCount != 1 {
+		t.Errorf("idx_subs_user_exp count = %d, want 1 (index lost on subscriptions rebuild?)", idxCount)
+	}
+
 	// 3. Seed: 3 plans + directory_version singleton.
 	var plans int
 	if err := db.QueryRow(`SELECT COUNT(*) FROM plans`).Scan(&plans); err != nil {
diff --git a/server/migrations/sqlite/000024_invite_rewards.down.sql b/server/migrations/sqlite/000024_invite_rewards.down.sql
index bc06792..b644e9c 100644
--- a/server/migrations/sqlite/000024_invite_rewards.down.sql
+++ b/server/migrations/sqlite/000024_invite_rewards.down.sql
@@ -13,6 +13,7 @@ INSERT INTO subscriptions_old SELECT id,user_id,plan_id,expires_at,source,create
   FROM subscriptions WHERE source IN ('trial','code','pay');
 DROP TABLE subscriptions;
 ALTER TABLE subscriptions_old RENAME TO subscriptions;
+CREATE INDEX idx_subs_user_exp ON subscriptions (user_id, expires_at);
 
 DROP TABLE reward_claims;
 DROP TABLE referrals;
diff --git a/server/migrations/sqlite/000024_invite_rewards.up.sql b/server/migrations/sqlite/000024_invite_rewards.up.sql
index 3088246..b66e5a6 100644
--- a/server/migrations/sqlite/000024_invite_rewards.up.sql
+++ b/server/migrations/sqlite/000024_invite_rewards.up.sql
@@ -47,3 +47,4 @@ INSERT INTO subscriptions_new (id,user_id,plan_id,expires_at,source,created_at)
   SELECT id,user_id,plan_id,expires_at,source,created_at FROM subscriptions;
 DROP TABLE subscriptions;
 ALTER TABLE subscriptions_new RENAME TO subscriptions;
+CREATE INDEX idx_subs_user_exp ON subscriptions (user_id, expires_at);