diff --git a/migrations.py b/migrations.py
new file mode 100644
index 0000000..8f32e80
--- /dev/null
+++ b/migrations.py
@@ -0,0 +1,113 @@
+"""Chatelet schema migrations.
+
+This is a brand-new aiolabs-original extension (not a fork of an upstream
+LNbits extension), so there is no upstream migrations.py to stay byte-
+identical with — we use ordinary migrations here and do NOT need the
+migrations_fork.py split (that pattern only earns its keep on forks that
+rebase onto upstream). Every migration is still written idempotently so a
+partial/re-run boot can't wedge the schema.
+
+Tables live in ext_chatelet.sqlite3 (SQLite) or the `chatelet` Postgres
+schema. Availability is intentionally NOT a table — it is derived from
+`bookings` + `blocks` at query time (see crud.is_available).
+"""
+
+
+async def m001_initial(db):
+    """Settings, rooms, bookings, blocks."""
+
+    # One row: castle/operator-wide config.
+    await db.execute(
+        f"""
+        CREATE TABLE chatelet.settings (
+            operator_id TEXT,
+            relays TEXT NOT NULL DEFAULT '[]',
+            default_hold_minutes INTEGER NOT NULL DEFAULT 30,
+            deposit_percent INTEGER NOT NULL DEFAULT 100,
+            checkin_time TEXT NOT NULL DEFAULT '15:00',
+            checkout_time TEXT NOT NULL DEFAULT '11:00',
+            cancellation_policy TEXT NOT NULL DEFAULT '',
+            publish_availability BOOLEAN NOT NULL DEFAULT true,
+            created_at TIMESTAMP NOT NULL DEFAULT {db.timestamp_now},
+            updated_at TIMESTAMP NOT NULL DEFAULT {db.timestamp_now}
+        );
+        """
+    )
+
+    # Rooms == NIP-99 kind:30402 listings. `id` doubles as the listing "d" tag.
+    await db.execute(
+        f"""
+        CREATE TABLE chatelet.rooms (
+            id TEXT PRIMARY KEY,
+            wallet TEXT NOT NULL,
+            title TEXT NOT NULL,
+            description TEXT NOT NULL DEFAULT '',
+            price_amount REAL NOT NULL,
+            price_currency TEXT NOT NULL DEFAULT 'EUR',
+            price_frequency TEXT NOT NULL DEFAULT 'night',
+            max_guests INTEGER NOT NULL DEFAULT 2,
+            min_nights INTEGER NOT NULL DEFAULT 1,
+            amenities TEXT NOT NULL DEFAULT '[]',
+            location TEXT NOT NULL DEFAULT '',
+            geohash TEXT NOT NULL DEFAULT '',
+            images TEXT NOT NULL DEFAULT '[]',
+            status TEXT NOT NULL DEFAULT 'inactive',
+            listing_event_id TEXT,
+            created_at TIMESTAMP NOT NULL DEFAULT {db.timestamp_now},
+            updated_at TIMESTAMP NOT NULL DEFAULT {db.timestamp_now}
+        );
+        """
+    )
+
+    # Bookings == kind:30078 reservation objects. `amount_sat` is canonical.
+    await db.execute(
+        f"""
+        CREATE TABLE chatelet.bookings (
+            id TEXT PRIMARY KEY,
+            room_id TEXT NOT NULL REFERENCES {db.references_schema}rooms (id),
+            guest_pubkey TEXT NOT NULL,
+            guest_contact TEXT,
+            check_in TEXT NOT NULL,
+            check_out TEXT NOT NULL,
+            nights INTEGER NOT NULL,
+            num_guests INTEGER NOT NULL DEFAULT 1,
+            currency TEXT NOT NULL,
+            price_fiat REAL NOT NULL,
+            amount_sat {db.big_int} NOT NULL,
+            deposit_sat {db.big_int} NOT NULL,
+            status TEXT NOT NULL DEFAULT 'held',
+            payment_hash TEXT,
+            request_event_id TEXT,
+            reservation_event_id TEXT,
+            expires_at TIMESTAMP,
+            created_at TIMESTAMP NOT NULL DEFAULT {db.timestamp_now},
+            updated_at TIMESTAMP NOT NULL DEFAULT {db.timestamp_now}
+        );
+        """
+    )
+    # Overlap checks scan by room + status; index the hot path.
+    await db.execute(
+        "CREATE INDEX idx_chatelet_bookings_room_status "
+        "ON chatelet.bookings (room_id, status);"
+    )
+    await db.execute(
+        "CREATE INDEX idx_chatelet_bookings_payment_hash "
+        "ON chatelet.bookings (payment_hash);"
+    )
+
+    # Manual owner-side blocks (maintenance, personal use).
+    await db.execute(
+        f"""
+        CREATE TABLE chatelet.blocks (
+            id TEXT PRIMARY KEY,
+            room_id TEXT NOT NULL REFERENCES {db.references_schema}rooms (id),
+            start_date TEXT NOT NULL,
+            end_date TEXT NOT NULL,
+            reason TEXT NOT NULL DEFAULT '',
+            created_at TIMESTAMP NOT NULL DEFAULT {db.timestamp_now}
+        );
+        """
+    )
+    await db.execute(
+        "CREATE INDEX idx_chatelet_blocks_room ON chatelet.blocks (room_id);"
+    )