add timescaledb extension migration and orders_daily_by_created continuous aggregate

P22.1 of Stage 22 materialization layer infrastructure. Adds explicit
CREATE EXTENSION migration so clean environments can run `migrate` end-to-end
without ops manual setup, then creates the first continuous aggregate
orders_daily_by_created (day-bucketed, grouped by company/platform/store)
with WITH NO DATA. Five composite indexes cover the high-frequency query
patterns documented in docs/data_query.md. P22.2/P22.3 will add the
by-paid view, refresh policy and historical backfill on top.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/migrations/2026_05_07_100000_enable_timescaledb_extension.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+use Hyperf\DbConnection\Db;
+use Hyperf\Database\Migrations\Migration;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Db::statement('CREATE EXTENSION IF NOT EXISTS timescaledb');
+    }
+
+    public function down(): void
+    {
+        // 不主动 DROP EXTENSION：existing hypertables 依赖该扩展，drop 会破坏数据。
+        // 完全清空数据库时手动执行 `DROP EXTENSION timescaledb CASCADE`。
+    }
+};

backend/migrations/2026_05_07_100100_create_orders_daily_by_created.php

@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+use Hyperf\DbConnection\Db;
+use Hyperf\Database\Migrations\Migration;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        // 连续聚合视图：按订单创建日期日聚合（含未付订单）。
+        // WITH NO DATA：视图创建时不立即物化，由 P22.3 的回填命令一次性填充历史数据。
+        Db::statement(<<<'SQL'
+CREATE MATERIALIZED VIEW orders_daily_by_created
+WITH (timescaledb.continuous) AS
+SELECT
+    time_bucket('1 day', created_date) AS day,
+    company_id,
+    platform_id,
+    store_id,
+    COUNT(*) AS total_orders,
+    COUNT(*) FILTER (WHERE paid_date IS NOT NULL) AS paid_orders,
+    COUNT(*) FILTER (WHERE paid_date IS NULL) AS unpaid_orders,
+    SUM(total_amount) AS sum_total_amount,
+    SUM(total_paid) AS sum_total_paid,
+    SUM(total_received) AS sum_total_received,
+    AVG(total_amount) AS avg_total_amount,
+    AVG(total_paid) FILTER (WHERE paid_date IS NOT NULL) AS avg_paid_amount,
+    SUM(freight_fee) AS sum_freight_fee,
+    SUM(tax_fee) AS sum_tax_fee,
+    SUM(commission_fee) AS sum_commission_fee,
+    SUM(discount_fee) AS sum_discount_fee
+FROM orders
+GROUP BY day, company_id, platform_id, store_id
+WITH NO DATA;
+SQL);
+
+        // 复合索引：覆盖"最近 N 日按 X 维度"与"指定 X 全历史时间序列"两类高频查询。
+        Db::statement('CREATE INDEX IF NOT EXISTS idx_orders_daily_by_created_day_company ON orders_daily_by_created (day DESC, company_id)');
+        Db::statement('CREATE INDEX IF NOT EXISTS idx_orders_daily_by_created_day_platform ON orders_daily_by_created (day DESC, platform_id)');
+        Db::statement('CREATE INDEX IF NOT EXISTS idx_orders_daily_by_created_day_store ON orders_daily_by_created (day DESC, store_id)');
+        Db::statement('CREATE INDEX IF NOT EXISTS idx_orders_daily_by_created_company_day ON orders_daily_by_created (company_id, day DESC)');
+        Db::statement('CREATE INDEX IF NOT EXISTS idx_orders_daily_by_created_store_day ON orders_daily_by_created (store_id, day DESC)');
+    }
+
+    public function down(): void
+    {
+        // CASCADE 一并 drop 索引以及后续阶段附加的刷新策略。
+        Db::statement('DROP MATERIALIZED VIEW IF EXISTS orders_daily_by_created CASCADE');
+    }
+};