feat: add system configuration platform

modules/core/server/db.ts

@@ -0,0 +1,37 @@
+import "server-only";
+
+import { sql } from "drizzle-orm";
+import { drizzle, type PostgresJsDatabase } from "drizzle-orm/postgres-js";
+import postgres from "postgres";
+
+import * as schema from "@/modules/core/server/schema";
+
+export type AppDatabase = PostgresJsDatabase<typeof schema>;
+
+let cachedDatabase: AppDatabase | null = null;
+let cachedClient: postgres.Sql | null = null;
+
+export function getDatabase(): AppDatabase {
+  const databaseUrl = process.env.DATABASE_URL;
+  if (!databaseUrl) {
+    throw new Error("DATABASE_URL is required for database-backed system configuration");
+  }
+
+  if (!cachedDatabase) {
+    cachedClient = postgres(databaseUrl, { max: 1 });
+    cachedDatabase = drizzle(cachedClient, { schema });
+  }
+
+  return cachedDatabase;
+}
+
+export async function checkDatabaseConnection(): Promise<{ ok: boolean; reason: string }> {
+  try {
+    const database = getDatabase();
+    await database.execute(sql`select 1`);
+    return { ok: true, reason: "数据库连接正常" };
+  } catch (error) {
+    const reason = error instanceof Error ? error.message : "数据库连接失败";
+    return { ok: false, reason };
+  }
+}