diff --git a/lib/db/client.ts b/lib/db/client.ts
index 6c5bb10..70ff305 100644
--- a/lib/db/client.ts
+++ b/lib/db/client.ts
@@ -43,6 +43,24 @@ CREATE TABLE IF NOT EXISTS jump_routes (
   PRIMARY KEY (from_system, to_system)
 );
 
+CREATE TABLE IF NOT EXISTS planets (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  system_id INTEGER NOT NULL REFERENCES solar_systems(id),
+  parent_id INTEGER, -- NULL for a planet, set to the parent planet's id for a moon
+  name TEXT NOT NULL,
+  type TEXT NOT NULL,
+  hazard INTEGER NOT NULL DEFAULT 0,
+  explored INTEGER NOT NULL DEFAULT 0
+);
+
+CREATE TABLE IF NOT EXISTS inventory_items (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  save_id INTEGER NOT NULL REFERENCES saves(id),
+  kind TEXT NOT NULL, -- 'resource' | 'part'
+  name TEXT NOT NULL,
+  qty INTEGER NOT NULL DEFAULT 1
+);
+
 CREATE TABLE IF NOT EXISTS events (
   id INTEGER PRIMARY KEY AUTOINCREMENT,
   save_id INTEGER NOT NULL REFERENCES saves(id),
diff --git a/lib/db/schema.ts b/lib/db/schema.ts
index 201e40c..ef42d28 100644
--- a/lib/db/schema.ts
+++ b/lib/db/schema.ts
@@ -35,6 +35,29 @@ export const jumpRoutes = sqliteTable(
   (t) => [primaryKey({ columns: [t.fromSystem, t.toSystem] })],
 )
 
+// Bodies of a solar system: planets (parent_id NULL) and moons (parent_id = their planet's
+// id). Generated when the system is generated, so every system has 2–5 planets, some with
+// 1–3 moons. Insertion order is display order — a moon always follows its parent row.
+export const planets = sqliteTable('planets', {
+  id: integer('id').primaryKey({ autoIncrement: true }),
+  systemId: integer('system_id').notNull().references(() => solarSystems.id),
+  parentId: integer('parent_id'), // NULL for a planet, set for a moon
+  name: text('name').notNull(),
+  type: text('type').notNull(),
+  hazard: integer('hazard', { mode: 'boolean' }).notNull().default(false),
+  explored: integer('explored', { mode: 'boolean' }).notNull().default(false),
+})
+
+// Dumb-simple cargo hold on the save: what exploration has found so far. SHIP SYSTEMS (#8)
+// will spend parts from here later; nothing consumes it yet.
+export const inventoryItems = sqliteTable('inventory_items', {
+  id: integer('id').primaryKey({ autoIncrement: true }),
+  saveId: integer('save_id').notNull().references(() => saves.id),
+  kind: text('kind').notNull(), // 'resource' | 'part'
+  name: text('name').notNull(),
+  qty: integer('qty').notNull().default(1),
+})
+
 // Append-only game log. Writers so far: new-game + jump events; later issues add more
 // writers and a read endpoint.
 export const events = sqliteTable('events', {