DOCSP-55530: Add logging

[cbullinger]

Add Consistent Request Logging Across All Backends

Summary

Implements consistent HTTP request logging across Express, Java Spring, and Python FastAPI backends. All three backends now have colorized console output, configurable log levels, and appropriate log severity based on HTTP status codes.

Changes

Java Spring Backend

• New file: RequestLoggingFilter.java - HTTP request logging filter that logs method, URL, status code, and response time
• Updated: application.properties - Enhanced logging configuration with configurable LOG_LEVEL, colorized console output, and optional file logging

Python FastAPI Backend

• New file: src/utils/logger.py - Centralized logging utility with colorized output and configurable levels
• New file: src/middleware/__init__.py - Middleware package initialization
• New file: src/middleware/request_logging.py - Request logging middleware
• Updated: main.py - Integrated logger and request logging middleware, replaced print() with logger calls
• Updated: .env.example - Added LOG_LEVEL and LOG_FILE configuration options

Express Backend

• New file: src/utils/logger.ts - Centralized logging utility using Winston
• New file: src/middleware/requestLogger.ts - Request logging middleware
• Updated: database.ts - Integrated logger and request logging middleware
• Updated: errorHandler.ts - Integrated logger and request logging middleware
• Updated: .env.example - Added LOG_LEVEL configuration option

Next.js Client (No Changes)

Frontend logging is handled by the browser console; no server-side logging needed.

Consistency Across Backends

Feature	Express	Java Spring	Python FastAPI
Request logging	Winston	Filter (SLF4J/Logback (built-in))	Middleware
Colorized output	x	x	x
Configurable level	LOG_LEVEL	LOG_LEVEL	LOG_LEVEL
File logging	logs/	LOG_FILE	LOG_FILE
Status-based severity	x	x	x

Log Format (All Backends)

HH:MM:SS LEVEL : METHOD /path STATUS - TIMEms

Example output:

17:22:22 INFO  : GET /api/movies 200 - 45ms
17:22:22 WARN  : GET /api/movies/invalid 400 - 2ms
17:22:22 ERROR : POST /api/movies 500 - 120ms

Testing

• All Python unit tests pass ✅
• All Java unit tests pass ✅
• All Express unit tests pass ✅

[tmcneil-mdb]

lgtm!

I was able to get it working for all three backends.

Nit: The Express backend does seem to produce extra logs if a search index is present. I think its logging an error if a index already exists?