step 10.11: done

src/db/migrations/007_hp_regen.sql

@@ -0,0 +1,7 @@
+-- Migration 007: Natural HP regeneration
+-- Adds hp_updated_at column for lazy HP regen computation.
+
+ALTER TABLE characters ADD COLUMN hp_updated_at INTEGER NOT NULL DEFAULT 0;
+
+-- Backfill existing rows: use energy_updated_at as the initial HP timestamp
+UPDATE characters SET hp_updated_at = energy_updated_at WHERE hp_updated_at = 0;