Slow sim to 1× on landing and resume last selected speed (ISS-057, v0.30.0)

lib/db/schema.ts

@@ -61,6 +61,10 @@ export const simState = sqliteTable('sim_state', {
   // Real-time (Date.now()) of the last tick — the tick-on-read engine advances
   // clockMs by (now - lastRealTickMs) × timeScale, clamped per tick.
   lastRealTickMs: integer('last_real_tick_ms').notNull(),
+  // Last MANUALLY selected speed (v0.30.0, ISS-057) — landings slow the sim to 1× without
+  // touching this; flyPlane restores it when the last grounded plane takes off. Written by
+  // POST /api/sim whenever timeScale is posted; pre-existing rows backfill to time_scale.
+  lastSelectedTimeScale: real('last_selected_time_scale').notNull().default(1),
 });
 
 export type PlaneRow = typeof planes.$inferSelect;