feat(monorepo): migrate to typescript monorepo

packages/db/src/client.ts

@@ -0,0 +1,55 @@
+import { drizzle } from "drizzle-orm/node-postgres";
+import { Pool } from "pg";
+import * as schema from "@/schema";
+
+const isDevelopment = process.env.NODE_ENV === "development";
+
+const connectionConfig = {
+  max: isDevelopment ? 8 : 12,
+  idleTimeoutMillis: isDevelopment ? 5_000 : 60_000,
+  connectionTimeoutMillis: 15_000,
+  maxUses: isDevelopment ? 100 : 0,
+  allowExitOnIdle: true,
+};
+
+const pool = new Pool({
+  connectionString: process.env.DATABASE_URL ?? process.env.DATABASE_PRIMARY_URL!,
+  ...connectionConfig,
+});
+
+// Lightweight connection pool monitoring (single pool)
+export const getConnectionPoolStats = () => {
+  const stats = {
+    name: "primary",
+    total: pool.options.max ?? 0,
+    idle: pool.idleCount ?? 0,
+    active: Math.max(0, (pool.totalCount ?? 0) - (pool.idleCount ?? 0)),
+    waiting: pool.waitingCount ?? 0,
+    ended: (pool as any).ended ?? false,
+  };
+
+  const totalConnections = connectionConfig.max;
+  const utilization =
+    totalConnections > 0 ? Math.round((stats.active / totalConnections) * 100) : 0;
+
+  return {
+    timestamp: new Date().toISOString(),
+    region: process.env.FLY_REGION || "unknown",
+    instance: process.env.FLY_ALLOC_ID || "local",
+    pools: { primary: stats },
+    summary: {
+      totalConnections,
+      totalActive: stats.active,
+      totalWaiting: stats.waiting,
+      hasExhaustedPools: stats.active >= totalConnections || (stats.waiting ?? 0) > 0,
+      utilizationPercent: utilization,
+    },
+  };
+};
+
+export const db = drizzle(pool, {
+  schema,
+  casing: "snake_case",
+});
+export const connectDb = async () => db;
+export type Database = Awaited<ReturnType<typeof connectDb>>;