diff --git a/schema/init/aime.sql b/schema/init/aime.sql
index 342185f..65c2d5e 100644
--- a/schema/init/aime.sql
+++ b/schema/init/aime.sql
@@ -1,35 +1,9 @@
-create table "aime_shop" (
-    "id" integer primary key not null,
-    "ext_id" integer not null,
-    "name" text not null,
-    "region" text not null,
-    constraint "aime_shop_uq" unique ("ext_id")
-);
-
-create table "aime_machine" (
-    "id" integer primary key not null,
-    "shop_id" integer not null
-            references "aime_shop"("id"),
-    "pcb_id" text not null,
-    "keychip_id" text not null,
-    constraint "aime_machine_pcb_id_uq" unique ("pcb_id"),
-    constraint "aime_machine_keychip_id_uq" unique ("keychip_id")
-);
-
 create table "aime_player" (
     "id" integer primary key not null,
     "ext_id" integer not null,
-    "register_time" timestamp not null,
-    constraint "aime_player_uq" unique ("ext_id")
-);
-
-create table "aime_card" (
-    "id" integer primary key not null,
-    "player_id" integer not null
-            references "aime_player"("id")
-            on delete cascade,
-    "nfc_id" text not null,
+    "luid" text not null,
     "register_time" timestamp not null,
     "access_time" timestamp not null,
-    constraint "aime_card_uq" unique ("nfc_id")
+    constraint "aime_player_ext_id_uq" unique ("ext_id"),
+    constraint "aime_player_luid_uq" unique ("luid")
 );
diff --git a/schema/migrate/M0007-aime-simplify-player.sql b/schema/migrate/M0007-aime-simplify-player.sql
new file mode 100644
index 0000000..cd927f8
--- /dev/null
+++ b/schema/migrate/M0007-aime-simplify-player.sql
@@ -0,0 +1,27 @@
+-- Can't add NOT NULL or UNIQUE constraints as we'd like to. Fortunately we
+-- haven't released anything yet so there aren't really any DBs with live
+-- data out there in the wild.
+
+-- (Can't drop and recreate the table either btw because "aime_player" is
+-- transitively referenced by _literally everything_).
+
+alter table "aime_player" add column "luid" text;
+alter table "aime_player" add column "access_time" text;
+
+update      "aime_player" as "p"
+set         "luid" = (
+                    select      "c"."nfc_id"
+                    from        "aime_card" as "c"
+                    where       "c"."player_id" = "p"."id"
+            ),
+            "access_time" = (
+                    select      "c"."access_time"
+                    from        "aime_card" as "c"
+                    where       "c"."player_id" = "p"."id"
+            );
+
+drop table "aime_card";
+
+-- These were never used. Re-create them if they become necessary.
+drop table "aime_machine";
+drop table "aime_shop";
diff --git a/src/aimedb/sql.ts b/src/aimedb/sql.ts
index c4b54a4..3ae5429 100644
--- a/src/aimedb/sql.ts
+++ b/src/aimedb/sql.ts
@@ -9,10 +9,9 @@ class CardRepositoryImpl implements CardRepository {
 
   async lookup(luid: string, now: Date): Promise<AimeId | undefined> {
     const fetchSql = sql
-      .select("c.id", "p.ext_id")
-      .from("aime_card c")
-      .join("aime_player p", { "c.player_id": "p.id" })
-      .where("c.nfc_id", luid);
+      .select("p.id", "p.ext_id")
+      .from("aime_player p")
+      .where("p.luid", luid);
 
     const row = await this._txn.fetchRow(fetchSql);
 
@@ -24,7 +23,7 @@ class CardRepositoryImpl implements CardRepository {
     const extId = row.ext_id;
 
     const touchSql = sql
-      .update("aime_card")
+      .update("aime_player")
       .set({ access_time: now })
       .where("id", id);
 
@@ -34,27 +33,18 @@ class CardRepositoryImpl implements CardRepository {
   }
 
   async register(luid: string, now: Date): Promise<AimeId> {
-    const playerId = this._txn.generateId();
-    const cardId = this._txn.generateId();
+    const id = this._txn.generateId();
     const aimeId = generateExtId() as AimeId;
 
-    const playerSql = sql.insert("aime_player", {
-      id: playerId,
+    const insertSql = sql.insert("aime_player", {
+      id: id,
       ext_id: aimeId,
-      register_time: now,
-    });
-
-    await this._txn.modify(playerSql);
-
-    const cardSql = sql.insert("aime_card", {
-      id: cardId,
-      player_id: playerId,
-      nfc_id: luid,
+      luid: luid,
       register_time: now,
       access_time: now,
     });
 
-    await this._txn.modify(cardSql);
+    await this._txn.modify(insertSql);
 
     return aimeId;
   }