fix: cap postgres connection pools

src/components/backend-core/src/index.ts

@@ -41,6 +41,7 @@ interface RuntimeConfig {
   baiduNetdiskInternalUrl: string;
   microservices: MicroserviceConfig[];
   logFile: string;
+  databasePoolMax: number;
 }
 
 interface MicroserviceConfig {
@@ -204,9 +205,10 @@ const serviceStartedAt = new Date();
 const config = readConfig();
 const logger = createLogger("backend-core", config.logFile);
 const sql = postgres(config.databaseUrl, {
-  max: 8,
+  max: config.databasePoolMax,
   idle_timeout: 20,
   connect_timeout: 10,
+  connection: { application_name: "unidesk-backend-core" },
 });
 
 let dbReady = false;
@@ -363,6 +365,7 @@ function readConfig(): RuntimeConfig {
     baiduNetdiskInternalUrl: process.env.BAIDU_NETDISK_INTERNAL_URL || "http://baidu-netdisk:4244",
     microservices: readMicroservicesEnv(),
     logFile: requiredEnv("LOG_FILE"),
+    databasePoolMax: Math.max(1, Math.min(16, readOptionalNumberEnv("DATABASE_POOL_MAX", 4))),
   };
 }