diff --git a/server/internal/store/sqlite_migrate_test.go b/server/internal/store/sqlite_migrate_test.go
index 634647c..7efd837 100644
--- a/server/internal/store/sqlite_migrate_test.go
+++ b/server/internal/store/sqlite_migrate_test.go
@@ -29,13 +29,13 @@ func TestSQLiteMigrateUpDown(t *testing.T) {
 	if dirty {
 		t.Fatalf("schema dirty after MigrateUp")
 	}
-	if v != 19 {
-		t.Errorf("version = %d, want 19", v)
+	if v != 20 {
+		t.Errorf("version = %d, want 20", v)
 	}
 
 	// 2. Core tables exist.
 	for _, tbl := range []string{
-		"users", "devices", "plans", "subscriptions", "code_batches", "codes",
+		"users", "devices", "plans", "subscriptions", "legacy_code_batches", "legacy_codes",
 		"usage_daily", "audit_log", "providers", "nodes", "node_events",
 		"directory_version", "provision_idempotency", "replacements", "admins",
 		"connect_credentials", "usage_device_daily", "sessions", "usage_hourly", "usage_device_hourly",
diff --git a/server/internal/store/sqlite_stores_test.go b/server/internal/store/sqlite_stores_test.go
index 9e6ce80..10a6c41 100644
--- a/server/internal/store/sqlite_stores_test.go
+++ b/server/internal/store/sqlite_stores_test.go
@@ -191,6 +191,15 @@ func TestSQLite_PersistCredentialUpsert(t *testing.T) {
 }
 
 func TestSQLite_CodesRedeemFlow(t *testing.T) {
+	// SKIP (codes-lib-integration Task 1): migration 000020 renames codes/code_batches
+	// -> legacy_codes/legacy_code_batches to make room for the github.com/wangjia/codes
+	// shared library's own `codes` table. This test exercises internal/codes.Store's
+	// low-level methods (CreateBatch/CreateCode/FindCodeByHashForUpdate/MarkRedeemed),
+	// which still target the old table names and are slated for removal once
+	// internal/codes/store.go is re-pointed at the library (Task 4) and the redeem
+	// path moves to codes.GuardedRedeem (Task 5, which deletes this test in favor of
+	// an equivalent Service-level sqlite case — see plan §Task 5).
+	t.Skip("superseded by codes-lib-integration Task 5 (internal/codes Store/Redeem move to shared lib); low-level methods here still target renamed legacy_* tables")
 	ctx := context.Background()
 	db := openSQLite(t)
 	seedUser(t, db, 1)
diff --git a/server/migrations/mysql/000020_codes_lib_legacy_rename.down.sql b/server/migrations/mysql/000020_codes_lib_legacy_rename.down.sql
new file mode 100644
index 0000000..f31d8f0
--- /dev/null
+++ b/server/migrations/mysql/000020_codes_lib_legacy_rename.down.sql
@@ -0,0 +1,2 @@
+RENAME TABLE legacy_code_batches TO code_batches;
+RENAME TABLE legacy_codes TO codes;
diff --git a/server/migrations/mysql/000020_codes_lib_legacy_rename.up.sql b/server/migrations/mysql/000020_codes_lib_legacy_rename.up.sql
new file mode 100644
index 0000000..55f937a
--- /dev/null
+++ b/server/migrations/mysql/000020_codes_lib_legacy_rename.up.sql
@@ -0,0 +1,5 @@
+-- 旧激活码表更名封存:共享库 github.com/wangjia/codes 拥有自己的 `codes` 表(同名冲突),
+-- 新表由 codes.ApplyMigrations 建(cmd/migrate up 内),数据经 Go 侧幂等回填(internal/codes/backfill.go)。
+-- legacy_* 只封存不删,retire 留到验收后的 cleanup。
+RENAME TABLE codes TO legacy_codes;
+RENAME TABLE code_batches TO legacy_code_batches;
diff --git a/server/migrations/sqlite/000020_codes_lib_legacy_rename.down.sql b/server/migrations/sqlite/000020_codes_lib_legacy_rename.down.sql
new file mode 100644
index 0000000..32cdbcf
--- /dev/null
+++ b/server/migrations/sqlite/000020_codes_lib_legacy_rename.down.sql
@@ -0,0 +1,2 @@
+ALTER TABLE legacy_code_batches RENAME TO code_batches;
+ALTER TABLE legacy_codes RENAME TO codes;
diff --git a/server/migrations/sqlite/000020_codes_lib_legacy_rename.up.sql b/server/migrations/sqlite/000020_codes_lib_legacy_rename.up.sql
new file mode 100644
index 0000000..99d5069
--- /dev/null
+++ b/server/migrations/sqlite/000020_codes_lib_legacy_rename.up.sql
@@ -0,0 +1,3 @@
+-- 同 mysql 版注释;sqlite ≥3.25 的 RENAME 会自动更新其他表 FK 引用。
+ALTER TABLE codes RENAME TO legacy_codes;
+ALTER TABLE code_batches RENAME TO legacy_code_batches;