feat: observability — Winston logging, pagination admin, N+1 playlists

backend/src/utils/logger.ts

@@ -0,0 +1,25 @@
+import winston from "winston";
+
+const { combine, timestamp, json, colorize, printf } = winston.format;
+
+const devFormat = combine(
+  colorize(),
+  timestamp({ format: "HH:mm:ss" }),
+  printf(({ level, message, timestamp: ts, ...meta }) => {
+    const metaStr = Object.keys(meta).length ? ` ${JSON.stringify(meta)}` : "";
+    return `${ts} [${level}] ${message}${metaStr}`;
+  })
+);
+
+const prodFormat = combine(
+  timestamp(),
+  json()
+);
+
+const logger = winston.createLogger({
+  level: process.env.LOG_LEVEL ?? "info",
+  format: process.env.NODE_ENV === "production" ? prodFormat : devFormat,
+  transports: [new winston.transports.Console()],
+});
+
+export default logger;