add correlation id to logging (#398)

This PR adds Correlation IDs to logs and request responses.

```
2026-02-04 12:40:32,793 - [afd825081d874d6e835b5c59a6ddb371] DEBUG - media_manager.movies - get_importable_movies(): Found 5 importable movies.
2026-02-04 12:40:32,794 - [afd825081d874d6e835b5c59a6ddb371] INFO - uvicorn.access - send(): 172.19.0.1:64094 - "GET /api/v1/movies/importable HTTP/1.1" 200
2026-02-04 12:40:47,322 - [41d30b7003fd45288c6a4bb1cfba5e7a] INFO - uvicorn.access - send(): 127.0.0.1:52964 - "GET /api/v1/health HTTP/1.1" 200
2026-02-04 12:41:17,408 - [157027ea5dde472a9e620f53739ccd53] INFO - uvicorn.access - send(): 127.0.0.1:39850 - "GET /api/v1/health HTTP/1.1" 200
```

media_manager/logging.py

@@ -21,13 +21,20 @@ LOG_FILE = Path(os.getenv("LOG_FILE", "/app/config/media_manager.log"))
 LOGGING_CONFIG = {
     "version": 1,
     "disable_existing_loggers": False,
+    "filters": {
+        "correlation_id": {
+            "()": "asgi_correlation_id.CorrelationIdFilter",
+            "uuid_length": 32,
+            "default_value": "-",
+        },
+    },
     "formatters": {
         "default": {
-            "format": "%(asctime)s - %(levelname)s - %(name)s - %(funcName)s(): %(message)s"
+            "format": "%(asctime)s - [%(correlation_id)s] %(levelname)s - %(name)s - %(funcName)s(): %(message)s"
         },
         "json": {
             "()": ISOJsonFormatter,
-            "format": "%(asctime)s %(levelname)s %(name)s %(message)s",
+            "format": "%(asctime)s %(correlation_id)s %(levelname)s %(name)s %(message)s",
             "rename_fields": {
                 "levelname": "level",
                 "asctime": "timestamp",
@@ -39,11 +46,13 @@ LOGGING_CONFIG = {
         "console": {
             "class": "logging.StreamHandler",
             "formatter": "default",
+            "filters": ["correlation_id"],
             "stream": sys.stdout,
         },
         "file": {
             "class": "logging.handlers.RotatingFileHandler",
             "formatter": "json",
+            "filters": ["correlation_id"],
             "filename": str(LOG_FILE),
             "maxBytes": 10485760,
             "backupCount": 5,

media_manager/main.py

@@ -2,6 +2,7 @@ import logging
 import os
 
 import uvicorn
+from asgi_correlation_id import CorrelationIdMiddleware
 from fastapi import APIRouter, FastAPI, Request, Response
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.staticfiles import StaticFiles
@@ -71,6 +72,7 @@ app.add_middleware(
     allow_credentials=True,
     allow_methods=["GET", "PUT", "POST", "DELETE", "PATCH", "HEAD", "OPTIONS"],
 )
+app.add_middleware(CorrelationIdMiddleware, header_name="X-Correlation-ID")
 api_app = APIRouter(prefix="/api/v1")
 
 

pyproject.toml

@@ -34,6 +34,7 @@ dependencies = [
     "transmission-rpc>=7.0.11",
     "libtorrent>=2.0.11",
     "pathvalidate>=3.3.1",
+    "asgi-correlation-id>=4.3.4",
 ]
 
 [dependency-groups]

uv.lock

@@ -105,6 +105,19 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/42/b9/f8d6fa329ab25128b7e98fd83a3cb34d9db5b059a9847eddb840a0af45dd/argon2_cffi_bindings-25.1.0-cp39-abi3-win_arm64.whl", hash = "sha256:b0fdbcf513833809c882823f98dc2f931cf659d9a1429616ac3adebb49f5db94", size = 27149, upload-time = "2025-07-30T10:01:59.329Z" },
 ]
 
+[[package]]
+name = "asgi-correlation-id"
+version = "4.3.4"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "packaging" },
+    { name = "starlette" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/f4/ff/a6538245ac1eaa7733ec6740774e9d5add019e2c63caa29e758c16c0afdd/asgi_correlation_id-4.3.4.tar.gz", hash = "sha256:ea6bc310380373cb9f731dc2e8b2b6fb978a76afe33f7a2384f697b8d6cd811d", size = 20075, upload-time = "2024-10-17T11:44:30.324Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/d9/ab/6936e2663c47a926e0659437b9333ad87d1ff49b1375d239026e0a268eba/asgi_correlation_id-4.3.4-py3-none-any.whl", hash = "sha256:36ce69b06c7d96b4acb89c7556a4c4f01a972463d3d49c675026cbbd08e9a0a2", size = 15262, upload-time = "2024-10-17T11:44:28.739Z" },
+]
+
 [[package]]
 name = "attrs"
 version = "25.4.0"
@@ -854,6 +867,7 @@ source = { virtual = "." }
 dependencies = [
     { name = "alembic" },
     { name = "apscheduler" },
+    { name = "asgi-correlation-id" },
     { name = "bencoder" },
     { name = "cachetools" },
     { name = "fastapi", extra = ["standard"] },
@@ -894,6 +908,7 @@ dev = [
 requires-dist = [
     { name = "alembic", specifier = ">=1.16.1" },
     { name = "apscheduler", specifier = ">=3.11.0" },
+    { name = "asgi-correlation-id", specifier = ">=4.3.4" },
     { name = "bencoder", specifier = ">=0.2.0" },
     { name = "cachetools", specifier = ">=6.0.0" },
     { name = "fastapi", extras = ["standard"], specifier = ">=0.115.12" },