diff --git a/.env.example b/.env.example
index e0f5cdd..3091903 100644
--- a/.env.example
+++ b/.env.example
@@ -1,26 +1,42 @@
-# PostgreSQL
-DB_USER=admin
-DB_PASSWORD=test
-DB_HOST=127.0.0.1
-DB_PORT=5432
-REDIS_URL=redis://localhost:6379/0
-SECRET_KEY=02247f40-a769-4c49-9178-4c038048e7ad
-DEBUG=True
-OFFERINGS_THRESHOLD_FOR_TERM_UPDATE=100
-
-# Frontend
-FRONTEND_URL=http://localhost:5173
-
-# wj platform
-SIGNUP_QUEST_API_KEY=
-SIGNUP_QUEST_URL=
-SIGNUP_QUEST_QUESTIONID=
-LOGIN_QUEST_API_KEY=
-LOGIN_QUEST_URL=
-LOGIN_QUEST_QUESTIONID=
-RESET_QUEST_API_KEY=
-RESET_QUEST_URL=
-RESET_QUEST_QUESTIONID=
-
-# Turnstile
-TURNSTILE_SECRET_KEY=
\ No newline at end of file
+# .env.example
+# Copy this file to .env and fill in the secrets for local development.
+# DO NOT COMMIT .env TO VERSION CONTROL.
+# This file overrides config.yaml
+
+# --- Core Security (REQUIRED IN PRODUCTION) ---
+# Generate a new one for production!
+SECRET_KEY=django-insecure-my-local-dev-secret-key
+
+# --- Local Overrides ---
+# Set to False in production
+# DEBUG=True
+
+# --- Infrastructure (REQUIRED) ---
+# Use a single URL for database and Redis connections.
+# Format: driver://user:password@host:port/dbname
+DATABASE__URL=postgres://admin:test@127.0.0.1:5432/coursereview
+REDIS__URL=redis://localhost:6379/0
+
+# --- External Services Secrets (REQUIRED) ---
+TURNSTILE_SECRET_KEY=dummy0
+
+# Use PARENT__CHILD format to override nested settings
+# URL and ID may be specified in config.yaml
+QUEST__SIGNUP__API_KEY=dummy1
+# QUEST__SIGNUP__URL=
+# QUEST__SIGNUP__QUESTIONID=
+
+QUEST__LOGIN__API_KEY=dummy2
+# QUEST__LOGIN__URL=
+# QUEST__LOGIN__QUESTIONID=
+
+QUEST__RESET__API_KEY=dummy3
+# QUEST__RESET__URL=
+# QUEST__RESET__QUESTIONID=
+
+# --- Other Overrides (Optional) ---
+# Example of overriding a nested value in the AUTH dictionary
+# AUTH__OTP_TIMEOUT=60
+
+# Example of overriding a list with a comma-separated string
+# ALLOWED_HOSTS=localhost,127.0.0.1,dev.my-app.com
diff --git a/.gitignore b/.gitignore
index 44337e7..24ea18b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+config.yaml
+
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[codz]
diff --git a/apps/auth/utils.py b/apps/auth/utils.py
index 0ca4a8b..e28d3b6 100644
--- a/apps/auth/utils.py
+++ b/apps/auth/utils.py
@@ -12,51 +12,41 @@
 
 from apps.web.models import Student
 
-PASSWORD_LENGTH_MIN = settings.AUTH["PASSWORD_LENGTH_MIN"]
-PASSWORD_LENGTH_MAX = settings.AUTH["PASSWORD_LENGTH_MAX"]
-OTP_TIME_OUT = settings.AUTH["OTP_TIME_OUT"]
-QUEST_BASE_URL = settings.AUTH["QUEST_BASE_URL"]
-EMAIL_DOMAIN_NAME = settings.AUTH["EMAIL_DOMAIN_NAME"]
-
-
-def get_survey_url(action: str) -> str | None:
-    """Helper function to get the survey URL based on action type"""
-    if action == "signup":
-        return settings.SIGNUP_QUEST_URL
-    if action == "login":
-        return settings.LOGIN_QUEST_URL
-    if action == "reset_password":
-        return settings.RESET_QUEST_URL
-    return None
-
-
-def get_survey_api_key(action: str) -> str | None:
-    """Helper function to get the survey API key based on action type"""
-    if action == "signup":
-        return settings.SIGNUP_QUEST_API_KEY
-    if action == "login":
-        return settings.LOGIN_QUEST_API_KEY
-    if action == "reset_password":
-        return settings.RESET_QUEST_API_KEY
-    return None
-
-
-def get_survey_questionid(action: str) -> int | None:
-    """Helper function to get the survey question ID for the verification code based on action type"""
-    question_id_str = None
-    if action == "signup":
-        question_id_str = settings.SIGNUP_QUEST_QUESTIONID
-    elif action == "login":
-        question_id_str = settings.LOGIN_QUEST_QUESTIONID
-    elif action == "reset_password":
-        question_id_str = settings.RESET_QUEST_QUESTIONID
-
-    if question_id_str:
-        try:
-            return int(question_id_str)
-        except (ValueError, TypeError):
-            return None
-    return None
+AUTH_SETTINGS = settings.AUTH
+PASSWORD_LENGTH_MIN = AUTH_SETTINGS["PASSWORD_LENGTH_MIN"]
+PASSWORD_LENGTH_MAX = AUTH_SETTINGS["PASSWORD_LENGTH_MAX"]
+OTP_TIMEOUT = AUTH_SETTINGS["OTP_TIMEOUT"]
+EMAIL_DOMAIN_NAME = AUTH_SETTINGS["EMAIL_DOMAIN_NAME"]
+
+QUEST_SETTINGS = settings.QUEST
+QUEST_BASE_URL = QUEST_SETTINGS["BASE_URL"]
+
+
+def get_survey_details(action: str) -> dict[str, any] | None:
+    """
+    A single, clean function to get all survey details for a given action.
+    Valid actions: "signup", "login", "reset".
+    """
+
+    action_details = QUEST_SETTINGS.get(action.upper())
+
+    if not action_details:
+        logging.error(f"Invalid quest action requested: {action}")
+        return None
+
+    try:
+        question_id = int(action_details.get("QUESTIONID"))
+    except (ValueError, TypeError):
+        logging.error(
+            f"Could not parse 'QUESTIONID' for action '{action}'. Check your settings."
+        )
+        return None
+
+    return {
+        "url": action_details.get("URL"),
+        "api_key": action_details.get("API_KEY"),
+        "question_id": question_id,
+    }
 
 
 async def verify_turnstile_token(
@@ -65,7 +55,7 @@ async def verify_turnstile_token(
     """Helper function to verify Turnstile token with Cloudflare's API"""
 
     try:
-        async with httpx.AsyncClient(timeout=OTP_TIME_OUT) as client:
+        async with httpx.AsyncClient(timeout=OTP_TIMEOUT) as client:
             response = await client.post(
                 "https://challenges.cloudflare.com/turnstile/v0/siteverify",
                 data={
@@ -99,12 +89,16 @@ async def get_latest_answer(
     `filtered_data` contains: id, submitted_at, user.account, and otp.
     `error_response` is a DRF Response object if an error occurs, otherwise None.
     """
-    quest_api = get_survey_api_key(action)
+
+    details = get_survey_details(action)
+    if not details:
+        return None, Response({"error": "Invalid action"}, status=400)
+    quest_api = details.get("api_key")
     if not quest_api:
         return None, Response({"error": "Invalid action"}, status=400)
 
     # Get the target question ID for the verification code
-    question_id = get_survey_questionid(action)
+    question_id = details.get("question_id")
     if not question_id:
         return None, Response(
             {"error": "Configuration error: question ID not found for action"},
@@ -129,7 +123,7 @@ async def get_latest_answer(
     full_url_path = f"{QUEST_BASE_URL}/{quest_api}/json"
 
     try:
-        async with httpx.AsyncClient(timeout=OTP_TIME_OUT) as client:
+        async with httpx.AsyncClient(timeout=OTP_TIMEOUT) as client:
             response = await client.get(
                 full_url_path,
                 params=final_query_params,
@@ -159,7 +153,8 @@ async def get_latest_answer(
         and full_data["data"].get("rows")
         and len(full_data["data"]["rows"]) > 0
     ):
-        latest_answer = full_data["data"]["rows"][0]  # Get the first (latest) row
+        # Get the first (latest) row
+        latest_answer = full_data["data"]["rows"][0]
 
         # Find the otp by matching the question ID
         otp = None
@@ -259,6 +254,7 @@ def create_user_session(
     `user` is the user object on success, otherwise None.
     `error_response` is a DRF Response object if an error occurs, otherwise None.
     """
+
     try:
         # Ensure session exists - create one if it doesn't exist
         if not request.session.session_key:
diff --git a/apps/auth/views.py b/apps/auth/views.py
index cf20b0f..19815da 100644
--- a/apps/auth/views.py
+++ b/apps/auth/views.py
@@ -29,11 +29,12 @@ def enforce_csrf(self, request):
         return
 
 
-OTP_TIME_OUT = settings.AUTH["OTP_TIME_OUT"]
-TEMP_TOKEN_TIMEOUT = settings.AUTH["TEMP_TOKEN_TIMEOUT"]
-ACTION_LIST = settings.AUTH["ACTION_LIST"]
-TOKEN_RATE_LIMIT = settings.AUTH["TOKEN_RATE_LIMIT"]
-TOKEN_RATE_LIMIT_TIME = settings.AUTH["TOKEN_RATE_LIMIT_TIME"]
+AUTH_SETTINGS = settings.AUTH
+OTP_TIMEOUT = AUTH_SETTINGS["OTP_TIMEOUT"]
+TEMP_TOKEN_TIMEOUT = AUTH_SETTINGS["TEMP_TOKEN_TIMEOUT"]
+ACTION_LIST = ["signup", "login", "reset_password"]
+TOKEN_RATE_LIMIT = AUTH_SETTINGS["TOKEN_RATE_LIMIT"]
+TOKEN_RATE_LIMIT_TIME = AUTH_SETTINGS["TOKEN_RATE_LIMIT_TIME"]
 
 
 @api_view(["POST"])
@@ -89,7 +90,9 @@ def auth_initiate_api(request):
                 existing_state = json.loads(existing_state_data)
                 r.delete(existing_state_key)
                 logging.info(
-                    f"Cleaned up existing temp_token_state for action {existing_state.get('action', 'unknown')}"
+                    f"Cleaned up existing temp_token_state for action {
+                        existing_state.get('action', 'unknown')
+                    }"
                 )
         except Exception as e:
             logging.warning(f"Error cleaning up existing temp_token: {e}")
@@ -97,7 +100,7 @@ def auth_initiate_api(request):
     # Store OTP -> temp_token mapping with initiated_at timestamp
     current_time = time.time()
     otp_data = {"temp_token": temp_token, "initiated_at": current_time}
-    r.setex(f"otp:{otp}", OTP_TIME_OUT, json.dumps(otp_data))
+    r.setex(f"otp:{otp}", OTP_TIMEOUT, json.dumps(otp_data))
 
     # Store temp_token with SHA256 hash as key, and status of pending as well as action
     temp_token_hash = hashlib.sha256(temp_token.encode()).hexdigest()
@@ -110,7 +113,10 @@ def auth_initiate_api(request):
 
     logging.info(f"Created auth intent for action {action} with OTP and temp_token")
 
-    survey_url = utils.get_survey_url(action)
+    details = utils.get_survey_details(action)
+    if not details:
+        return Response({"error": "Invalid action"}, status=400)
+    survey_url = details.get("url")
     if not survey_url:
         return Response(
             {"error": "Something went wrong when fetching the survey URL"},
@@ -236,7 +242,7 @@ def verify_callback_api(request):
         submitted_at = dateutil.parser.parse(submitted_at_str).timestamp()
 
         # Additional validation: check submission is after initiation and within window
-        if submitted_at < initiated_at or (submitted_at - initiated_at) > OTP_TIME_OUT:
+        if submitted_at < initiated_at or (submitted_at - initiated_at) > OTP_TIMEOUT:
             return Response(
                 {"error": "Submission timestamp outside validity window"},
                 status=401,
@@ -272,7 +278,11 @@ def verify_callback_api(request):
         if user is None:
             if error_response:
                 logging.error(
-                    f"Failed to create session for login: {getattr(error_response, 'data', {}).get('error', 'Unknown error')}",
+                    f"Failed to create session for login: {
+                        getattr(error_response, 'data', {}).get(
+                            'error', 'Unknown error'
+                        )
+                    }",
                 )
                 return error_response
             else:
@@ -288,7 +298,9 @@ def verify_callback_api(request):
             r.delete(state_key)
         except Exception as e:
             logging.exception(
-                f"Error during login session creation or cleanup for user {account}: {e}",
+                f"Error during login session creation or cleanup for user {account}: {
+                    e
+                }",
             )
             return Response({"error": "Failed to finalize login process"}, status=500)
 
diff --git a/config.yaml.example b/config.yaml.example
new file mode 100644
index 0000000..27105cd
--- /dev/null
+++ b/config.yaml.example
@@ -0,0 +1,57 @@
+# Please copy this file to config.yaml and fill in
+# corresponding fields.
+# For non-secret, environment-specific configuration.
+# Values here will override DEFAULTS in settings.py.
+# Environment variables will override values here.
+
+DEBUG: true
+
+# SECRET_KEY: Use env
+
+ALLOWED_HOSTS:
+  # - "backend.redacted.com"
+  - "localhost"
+  - "127.0.0.1"
+
+CORS_ALLOWED_ORIGINS:
+  # - "https://frontend.redacted.com"
+  - "http://localhost:5173"
+  - "http://127.0.0.1:5173"
+
+# SESSION:
+#   COOKIE_AGE: 2592000 # 30 days
+#   SAVE_EVERY_REQUEST: true
+#
+# AUTH:
+#   OTP_TIMEOUT: 120
+#   TEMP_TOKEN_TIMEOUT: 600
+#   TOKEN_RATE_LIMIT: 5
+#   TOKEN_RATE_LIMIT_TIME: 600
+#   PASSWORD_LENGTH_MIN: 10
+#   PASSWORD_LENGTH_MAX: 32
+#   EMAIL_DOMAIN_NAME: "sjtu.edu.cn"
+#
+# DATABASE:
+#   URL: Use env
+#
+# REDIS:
+#   URL: Use env
+#   MAX_CONNECTIONS: 100
+#
+# TURNSTILE_SECRET_KEY: Use env
+
+QUEST:
+  # BASE_URL: "https://wj.sjtu.edu.cn/api/v1/public/export"
+  SIGNUP:
+    # API_KEY: Use env
+    URL: "https://wj.sjtu.edu.cn/q/dummy0"
+    QUESTIONID: 10000000
+  LOGIN:
+    # API_KEY: Use env
+    URL: "https://wj.sjtu.edu.cn/q/dummy1"
+    QUESTIONID: 10000001
+  RESET:
+    # API_KEY: Use env
+    URL: "https://wj.sjtu.edu.cn/q/dummy2"
+    QUESTIONID: 10000002
+# AUTO_IMPORT_CRAWLED_DATA: true
diff --git a/docs/config.md b/docs/config.md
new file mode 100644
index 0000000..b0b73d3
--- /dev/null
+++ b/docs/config.md
@@ -0,0 +1,195 @@
+# Config
+
+Use YAML and environment variables for robust and secure configuration. All the customizable fields can be specified in `config.yaml` and environment variables (or `.env` file at local dev).
+
+## TL;DR
+
+1. Copy `.env.example` file to `.env`, fill in:
+   - `SECRET_KEY`
+   - `TURNSTILE_SECRET_KEY`
+   - `QUEST__SIGNUP__API_KEY`
+   - `QUEST__LOGIN__API_KEY`
+   - `QUEST__RESET__API_KEY`
+   - (If in production) `DATABASE__URL` and `REDIS__URL`
+2. Copy `config.yaml.example` to `config.yaml`, fill in:
+   - `DEBUG`: `true` if at dev, `false` if in production
+   - `URL` and `QUESTIONID` in all actions in `QUEST`
+   - (If in production) backend domains in `ALLOWED_HOSTS`, frontend domains in `CORS_ALLOWED_ORIGINS`
+3. That's it!
+
+## Priority
+
+env > `config.yaml` > default config
+
+Every field (including nested ones) can be specified anywhere (i.e. env, `config.yaml`, none/default), and config will be loaded with each field following the above priority order.
+
+### Environment Variables
+
+- Environment variables are used to set secrets and credentials.
+- Use `.env` file for local development. Directly export environment variables at production.
+- Copy this `.env.example` file to `.env` and fill in the secrets for local development.
+- `.env` should **NOT** be committed (already git ignored).
+- Use `PARENT__CHILD` format to override nested settings. `__` means parental relationship.
+- Use `,` as delimiter for lists.
+
+```env path=.env
+# .env.example
+# Copy this file to .env and fill in the secrets for local development.
+# DO NOT COMMIT .env TO VERSION CONTROL.
+# This file overrides config.yaml
+
+# --- Core Security (REQUIRED IN PRODUCTION) ---
+# Generate a new one for production!
+SECRET_KEY=django-insecure-my-local-dev-secret-key
+
+# --- Local Overrides ---
+# Set to False in production
+# DEBUG=True
+
+# --- Infrastructure (REQUIRED) ---
+# Use a single URL for database and Redis connections.
+# Format: driver://user:password@host:port/dbname
+DATABASE__URL=postgres://admin:test@127.0.0.1:5432/coursereview
+REDIS__URL=redis://localhost:6379/0
+
+# --- External Services Secrets (REQUIRED) ---
+TURNSTILE_SECRET_KEY=dummy0
+
+# Use PARENT__CHILD format to override nested settings
+# URL and ID may be specified in config.yaml
+QUEST__SIGNUP__API_KEY=dummy1
+# QUEST__SIGNUP__URL=
+# QUEST__SIGNUP__QUESTIONID=
+
+QUEST__LOGIN__API_KEY=dummy2
+# QUEST__LOGIN__URL=
+# QUEST__LOGIN__QUESTIONID=
+
+QUEST__RESET__API_KEY=dummy3
+# QUEST__RESET__URL=
+# QUEST__RESET__QUESTIONID=
+
+# --- Other Overrides (Optional) ---
+# Example of overriding a nested value in the AUTH dictionary
+# AUTH__OTP_TIMEOUT=60
+
+# Example of overriding a list with a comma-separated string
+# ALLOWED_HOSTS=localhost,127.0.0.1,dev.my-app.com
+```
+
+### YAML
+
+- `config.yaml` is used to set custom but not secret configs (e.g. frontend and backend URLs, questionnaire ID)
+- Copy this `config.yaml.example` file to `config.yaml` and fill in the required fields.
+- `config.yaml` should **NOT** be committed (already git ignored).
+
+```yaml path=config.yaml
+# Please copy this file to config.yaml and fill in
+# corresponding fields.
+# For non-secret, environment-specific configuration.
+# Values here will override DEFAULTS in settings.py.
+# Environment variables will override values here.
+
+DEBUG: true
+
+# SECRET_KEY: Use env
+
+ALLOWED_HOSTS:
+  # - "backend.redacted.com"
+  - "localhost"
+  - "127.0.0.1"
+
+CORS_ALLOWED_ORIGINS:
+  # - "https://frontend.redacted.com"
+  - "http://localhost:5173"
+  - "http://127.0.0.1:5173"
+
+# SESSION:
+#   COOKIE_AGE: 2592000 # 30 days
+#   SAVE_EVERY_REQUEST: true
+#
+# AUTH:
+#   OTP_TIMEOUT: 120
+#   TEMP_TOKEN_TIMEOUT: 600
+#   TOKEN_RATE_LIMIT: 5
+#   TOKEN_RATE_LIMIT_TIME: 600
+#   PASSWORD_LENGTH_MIN: 10
+#   PASSWORD_LENGTH_MAX: 32
+#   EMAIL_DOMAIN_NAME: "sjtu.edu.cn"
+#
+# DATABASE:
+#   URL: Use env
+#
+# REDIS:
+#   URL: Use env
+#   MAX_CONNECTIONS: 100
+#
+# TURNSTILE_SECRET_KEY: Use env
+
+QUEST:
+  # BASE_URL: "https://wj.sjtu.edu.cn/api/v1/public/export"
+  SIGNUP:
+    # API_KEY: Use env
+    URL: "https://wj.sjtu.edu.cn/q/dummy0"
+    QUESTIONID: 10000000
+  LOGIN:
+    # API_KEY: Use env
+    URL: "https://wj.sjtu.edu.cn/q/dummy1"
+    QUESTIONID: 10000001
+  RESET:
+    # API_KEY: Use env
+    URL: "https://wj.sjtu.edu.cn/q/dummy2"
+    QUESTIONID: 10000002
+# AUTO_IMPORT_CRAWLED_DATA: true
+```
+
+### Default Config
+
+- Just for example.
+- `settings.py` should **NOT** be modified by non-developers.
+- The fields whose default values are `None` are mandatory, either in env or in `config.yaml`.
+
+```python path=website/settings.py
+# --- Default Configuration ---
+DEFAULTS = {
+    "DEBUG": True,
+    "SECRET_KEY": None,
+    "ALLOWED_HOSTS": ["127.0.0.1", "localhost"],
+    "CORS_ALLOWED_ORIGINS": ["http://localhost:5173", "http://127.0.0.1:5173"],
+    "SESSION": {
+        "COOKIE_AGE": 2592000,  # 30 days
+        "SAVE_EVERY_REQUEST": True,
+    },
+    "AUTH": {
+        "OTP_TIMEOUT": 120,
+        "TEMP_TOKEN_TIMEOUT": 600,
+        "TOKEN_RATE_LIMIT": 5,
+        "TOKEN_RATE_LIMIT_TIME": 600,
+        "PASSWORD_LENGTH_MIN": 10,
+        "PASSWORD_LENGTH_MAX": 32,
+        "EMAIL_DOMAIN_NAME": "sjtu.edu.cn",
+    },
+    "DATABASE": {"URL": "sqlite:///db.sqlite3"},
+    "REDIS": {"URL": "redis://localhost:6379/0", "MAX_CONNECTIONS": 100},
+    "TURNSTILE_SECRET_KEY": None,
+    "QUEST": {
+        "BASE_URL": "https://wj.sjtu.edu.cn/api/v1/public/export",
+        "SIGNUP": {
+            "API_KEY": None,
+            "URL": None,
+            "QUESTIONID": None,
+        },
+        "LOGIN": {
+            "API_KEY": None,
+            "URL": None,
+            "QUESTIONID": None,
+        },
+        "RESET": {
+            "API_KEY": None,
+            "URL": None,
+            "QUESTIONID": None,
+        },
+    },
+    "AUTO_IMPORT_CRAWLED_DATA": True,
+}
+```
diff --git a/lib/constants.py b/lib/constants.py
index f26f03a..d8d8aef 100644
--- a/lib/constants.py
+++ b/lib/constants.py
@@ -1,4 +1,3 @@
-import os
 from datetime import datetime
 
 
@@ -21,6 +20,3 @@ def get_current_term():
 # CURRENT_TERM = os.environ["CURRENT_TERM"]  # e.g. 16S
 SUPPORT_EMAIL = "support@layuplist.com"
 REC_UPVOTE_REQ = 2
-OFFERINGS_THRESHOLD_FOR_TERM_UPDATE = int(
-    os.environ["OFFERINGS_THRESHOLD_FOR_TERM_UPDATE"]
-)
diff --git a/pyproject.toml b/pyproject.toml
index d099abc..ef49a79 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,15 +3,9 @@ name = ""
 version = "0.0.1"
 dependencies = [
     "beautifulsoup4>=4.13.3",
-    "celery>=5.4.0",
-    "crispy-bootstrap4>=2024.10",
     "dj-database-url>=2.3.0",
     "django>=5.1.6",
-    "django-celery-beat>=2.7.0",
-    "django-celery-results>=2.5.1",
-    "django-crispy-forms>=2.3",
     "django-debug-toolbar>=5.0.1",
-    "django-pipeline>=4.0.0",
     "httpx>=0.28.1",
     "psycopg2-binary>=2.9.10",
     "python-dateutil>=2.9.0",
diff --git a/uv.lock b/uv.lock
index 7e5ca33..5202b8b 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,6 +1,6 @@
 version = 1
 revision = 3
-requires-python = ">=3.12"
+requires-python = ">=3.13"
 
 [[package]]
 name = ""
@@ -9,16 +9,10 @@ source = { virtual = "." }
 dependencies = [
     { name = "beautifulsoup4" },
     { name = "bpython" },
-    { name = "celery" },
-    { name = "crispy-bootstrap4" },
     { name = "dj-database-url" },
     { name = "django" },
-    { name = "django-celery-beat" },
-    { name = "django-celery-results" },
     { name = "django-cors-headers" },
-    { name = "django-crispy-forms" },
     { name = "django-debug-toolbar" },
-    { name = "django-pipeline" },
     { name = "django-redis" },
     { name = "djangorestframework" },
     { name = "httpx" },
@@ -41,16 +35,10 @@ dev = [
 requires-dist = [
     { name = "beautifulsoup4", specifier = ">=4.13.3" },
     { name = "bpython", specifier = ">=0.25" },
-    { name = "celery", specifier = ">=5.4.0" },
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diff --git a/website/__init__.py b/website/__init__.py
index e83cb86..e69de29 100644
--- a/website/__init__.py
+++ b/website/__init__.py
@@ -1,7 +0,0 @@
-# website/__init__.py
-from __future__ import absolute_import
-
-# This will make sure the app is always imported when Django starts so that shared_task will use this app.
-from .celery import app as celery_app
-
-__all__ = ("celery_app",)
diff --git a/website/config.py b/website/config.py
new file mode 100644
index 0000000..2eab01f
--- /dev/null
+++ b/website/config.py
@@ -0,0 +1,139 @@
+import os
+import yaml
+import collections.abc
+from pathlib import Path
+from typing import Any, Callable, TypeVar
+from django.core.exceptions import ImproperlyConfigured
+from functools import reduce
+import operator
+
+# Generic TypeVar for casting function return values
+T = TypeVar("T")
+
+
+class Config:
+    """
+    A robust, nested configuration loader that deeply merges settings from three sources:
+    1. Environment Variables (using `PARENT__CHILD` for nesting)
+    2. YAML Configuration File (`config.yaml`)
+    3. Hardcoded Default Values
+
+    Raises ImproperlyConfigured if a required setting is not found in any source.
+    This class respects case-sensitivity for setting keys to align with Django conventions.
+    """
+
+    def __init__(self, config_path: Path, defaults: dict[str, Any] | None = None):
+        # 1. Load all sources of configuration.
+        default_config = defaults or {}
+        yaml_config = self._load_yaml(config_path)
+        env_config = self._load_from_env()
+
+        # 2. Build the final config by merging sources in the correct order of priority.
+        # Start with an empty dict, merge defaults, then yaml, then env.
+        self._final_config = {}
+        self._deep_merge(self._final_config, default_config)
+        self._deep_merge(self._final_config, yaml_config)
+        self._deep_merge(self._final_config, env_config)
+
+    def _deep_merge(self, base: dict, new: dict) -> None:
+        """Recursively merges `new` dict into `base` dict in place."""
+
+        for key, value in new.items():
+            base_value = base.get(key)
+            if isinstance(base_value, dict) and isinstance(
+                value, collections.abc.Mapping
+            ):
+                # If both the base and new values for a key are dicts, recurse.
+                self._deep_merge(base_value, value)
+            else:
+                # Otherwise, the new value overwrites the base value.
+                base[key] = value
+
+    def _load_yaml(self, config_path: Path) -> dict[str, Any]:
+        """Loads the YAML config file if it exists, otherwise returns an empty dict."""
+
+        if not config_path.exists():
+            return {}
+        try:
+            with open(config_path, "r", encoding="utf-8") as f:
+                return yaml.safe_load(f) or {}
+        except (yaml.YAMLError, IOError) as e:
+            raise ImproperlyConfigured(
+                f"Error reading YAML config at {config_path}: {e}"
+            )
+
+    def _load_from_env(self) -> dict[str, Any]:
+        """Parses environment variables like `AUTH__OTP_TIMEOUT` into a nested dict."""
+
+        env_config = {}
+        for key, value in os.environ.items():
+            # Skip keys that don't contain our nesting separator to avoid noise
+            if "__" not in key:
+                # Handle simple top-level keys
+                env_config[key] = value
+                continue
+
+            path = key.split("__")
+            target = env_config
+            for part in path[:-1]:  # Iterate through the path to create nested dicts
+                target = target.setdefault(part, {})
+                if not isinstance(target, dict):
+                    raise ImproperlyConfigured(
+                        f"Environment variable conflict. '{key}' implies '{
+                            part
+                        }' is a dictionary, "
+                        "but it was previously defined as a scalar value."
+                    )
+
+            target[path[-1]] = value
+
+        return env_config
+
+    def get(
+        self, key: str, *, cast: Callable[[Any], T] | None = None, required: bool = True
+    ) -> T | Any | None:
+        """
+        Retrieves a configuration value for a given key, supporting dot notation for nesting.
+
+        Example: `config.get("DATABASE.PORT", cast=int)`
+
+        Args:
+            key: The name of the setting, using '.' for nesting (e.g., "AUTH.OTP_TIMEOUT").
+            cast: An optional callable (e.g., int, bool) to cast the final value.
+            required: If True (default), raises ImproperlyConfigured if the key is not found.
+                      If False, returns None if the key is not found.
+
+        Returns:
+            The configuration value, or None if not found and not required.
+
+        Raises:
+            ImproperlyConfigured: If the key is required and not found in any source,
+                                  or if casting fails.
+        """
+
+        path = key.split(".")
+
+        try:
+            value = reduce(operator.getitem, path, self._final_config)
+        except (KeyError, TypeError):
+            if required:
+                raise ImproperlyConfigured(
+                    f"Required setting '{key}' is not defined in any source."
+                )
+            return None
+
+        if cast is not None:
+            if cast is bool and isinstance(value, str):
+                return value.lower() in ("true", "1", "yes")
+            if cast is list and isinstance(value, str):
+                return [item.strip() for item in value.split(",")]
+            try:
+                return cast(value)
+            except (ValueError, TypeError) as e:
+                raise ImproperlyConfigured(
+                    f"Failed to cast setting '{key}' with value {value!r} to {
+                        cast.__name__
+                    }. Error: {e}"
+                )
+
+        return value
diff --git a/website/development.yaml b/website/development.yaml
deleted file mode 100644
index 14cd0b8..0000000
--- a/website/development.yaml
+++ /dev/null
@@ -1,134 +0,0 @@
-# website/development.yaml
-
-INSTALLED_APPS:
-  - "django.contrib.admin"
-  - "django.contrib.auth"
-  - "django.contrib.contenttypes"
-  - "django.contrib.sessions"
-  - "django.contrib.messages"
-  - "django.contrib.staticfiles"
-  - "django.contrib.humanize"
-  - "debug_toolbar"
-  - "pipeline"
-  - "crispy_forms"
-  - "crispy_bootstrap4"
-  - "django_celery_beat"
-  - "django_celery_results"
-  - "rest_framework"
-  - "corsheaders"
-  - "apps.analytics"
-  - "apps.recommendations"
-  - "apps.spider"
-  - "apps.web"
-  - "apps.auth"
-
-MIDDLEWARE:
-  - "corsheaders.middleware.CorsMiddleware"
-  - "django.middleware.security.SecurityMiddleware"
-  - "django.contrib.sessions.middleware.SessionMiddleware"
-  - "django.middleware.common.CommonMiddleware"
-  - "django.middleware.csrf.CsrfViewMiddleware"
-  - "django.contrib.auth.middleware.AuthenticationMiddleware"
-  - "django.contrib.messages.middleware.MessageMiddleware"
-  - "django.middleware.clickjacking.XFrameOptionsMiddleware"
-  - "debug_toolbar.middleware.DebugToolbarMiddleware"
-
-ROOT_URLCONF: "website.urls"
-
-TEMPLATES:
-  - BACKEND: "django.template.backends.django.DjangoTemplates"
-    DIRS: []
-    APP_DIRS: True
-    OPTIONS:
-      context_processors:
-        - "django.template.context_processors.debug"
-        - "django.template.context_processors.request"
-        - "django.contrib.auth.context_processors.auth"
-        - "django.contrib.messages.context_processors.messages"
-
-CRISPY_TEMPLATE_PACK: "bootstrap4"
-
-WSGI_APPLICATION: "website.wsgi.application"
-
-# Password validation
-# https://docs.djangoproject.com/en/5.0/ref/settings/#auth-password-validators
-AUTH_PASSWORD_VALIDATORS:
-  - NAME: "django.contrib.auth.password_validation.UserAttributeSimilarityValidator"
-  - NAME: "django.contrib.auth.password_validation.MinimumLengthValidator"
-  - NAME: "django.contrib.auth.password_validation.CommonPasswordValidator"
-  - NAME: "django.contrib.auth.password_validation.NumericPasswordValidator"
-
-CELERY_RESULT_BACKEND: "django-db"
-CELERY_TIMEZONE: "Asia/Shanghai"
-
-AUTO_IMPORT_CRAWLED_DATA: "True"
-# Internationalization
-# https://docs.djangoproject.com/en/5.0/topics/i18n/
-LANGUAGE_CODE: "en-us"
-TIME_ZONE: "UTC"
-USE_I18N: True
-USE_TZ: True
-# Static files (CSS, JavaScript, Images)
-# https://docs.djangoproject.com/en/5.0/howto/static-files/
-STATIC_ROOT: "staticfiles"
-STATIC_URL: "/static/"
-STATICFILES_STORAGE: "pipeline.storage.ManifestStaticFilesStorage"
-STATICFILES_FINDERS:
-  - "django.contrib.staticfiles.finders.FileSystemFinder"
-  - "django.contrib.staticfiles.finders.AppDirectoriesFinder"
-  - "pipeline.finders.PipelineFinder"
-
-PIPELINE:
-  JAVASCRIPT:
-    app:
-      source_filenames:
-        - "js/plugins.js"
-        - "js/vendor/jquery.highlight-5.js"
-        - "js/web/base.jsx"
-        - "js/web/common.jsx"
-        - "js/web/landing.jsx"
-        - "js/web/current_term.jsx"
-        - "js/web/course_detail.jsx"
-        - "js/web/course_review_search.jsx"
-      output_filename: "js/app.js"
-  STYLESHEETS:
-    app:
-      source_filenames:
-        - "css/web/base.css"
-        - "css/web/current_term.css"
-        - "css/web/course_detail.css"
-        - "css/web/course_review_search.css"
-        - "css/web/landing.css"
-        - "css/web/auth.css"
-      output_filename: "css/app.css"
-      extra_context:
-        media: "screen,projection"
-
-# Default primary key field type
-# https://docs.djangoproject.com/en/5.0/ref/settings/#default-auto-field
-DEFAULT_AUTO_FIELD: "django.db.models.BigAutoField"
-
-SESSION_COOKIE_AGE: 2592000 # 30 days
-SESSION_SAVE_EVERY_REQUEST: True
-SESSION_ENGINE: "django.contrib.sessions.backends.cache"
-SESSION_CACHE_ALIAS: "default"
-
-ALLOWED_HOSTS:
-  - "localhost"
-  - "127.0.0.1"
-  - "0.0.0.0"
-
-# OAuth
-AUTH:
-  OTP_TIME_OUT: 120 # 2 min
-  TEMP_TOKEN_TIMEOUT: 600 # 10 min
-  ACTION_LIST:
-    - "signup"
-    - "login"
-    - "reset_password"
-  TOKEN_RATE_LIMIT: 5 # max 5 callback attempts per temp_token
-  TOKEN_RATE_LIMIT_TIME: 600 # 10 minutes window
-  PASSWORD_LENGTH_MIN: 10
-  PASSWORD_LENGTH_MAX: 32
-  QUEST_BASE_URL: "https://wj.sjtu.edu.cn/api/v1/public/export"
-  EMAIL_DOMAIN_NAME: "sjtu.edu.cn"
diff --git a/website/settings.py b/website/settings.py
index b0295bf..bbd2668 100644
--- a/website/settings.py
+++ b/website/settings.py
@@ -1,91 +1,171 @@
-import os
-import yaml
 from pathlib import Path
+import dj_database_url
 from dotenv import load_dotenv
-
-load_dotenv()
-
-TURNSTILE_SECRET_KEY = os.getenv("TURNSTILE_SECRET_KEY")
-# url and api for wj platform
-SIGNUP_QUEST_API_KEY = os.getenv("SIGNUP_QUEST_API_KEY")
-SIGNUP_QUEST_URL = os.getenv("SIGNUP_QUEST_URL")
-SIGNUP_QUEST_QUESTIONID = os.getenv("SIGNUP_QUEST_QUESTIONID")
-LOGIN_QUEST_API_KEY = os.getenv("LOGIN_QUEST_API_KEY")
-LOGIN_QUEST_URL = os.getenv("LOGIN_QUEST_URL")
-LOGIN_QUEST_QUESTIONID = os.getenv("LOGIN_QUEST_QUESTIONID")
-RESET_QUEST_API_KEY = os.getenv("RESET_QUEST_API_KEY")
-RESET_QUEST_URL = os.getenv("RESET_QUEST_URL")
-RESET_QUEST_QUESTIONID = os.getenv("RESET_QUEST_QUESTIONID")
-
-FRONTEND_URL = os.getenv("FRONTEND_URL", "http://localhost:5173")
-
-# Build paths inside the project like this: BASE_DIR / 'subdir'.
-BASE_DIR = os.path.dirname(os.path.abspath(__file__))
-
-
-# Load development config
-with open(Path(BASE_DIR) / "development.yaml") as f:
-    config = yaml.safe_load(f)
-
-for key, value in config.items():
-    globals()[key] = value
-
-# Quick-start development settings - unsuitable for production
-# See https://docs.djangoproject.com/en/5.0/howto/deployment/checklist/
-
-# SECURITY WARNING: keep the secret key used in production secret!
-SECRET_KEY = os.getenv("SECRET_KEY")
-
-# SECURITY WARNING: don't run with debug turned on in production!
-DEBUG = os.getenv("DEBUG") == "True"
-
-
-# Rest Framework
-
-if DEBUG:
-    CORS_ALLOW_ALL_ORIGINS = True
-else:
-    CORS_ALLOWED_ORIGINS = [
-        FRONTEND_URL,
-        "http://127.0.0.1:8080",
-        "http://localhost:8080",
-    ]
-
-
-# Database
-# https://docs.djangoproject.com/en/5.0/ref/settings/#databases
-
-DATABASES = {
-    "default": {
-        "ENGINE": "django.db.backends.postgresql",
-        "NAME": os.getenv("DB_NAME", "coursereview"),
-        "USER": os.getenv("DB_USER"),
-        "PASSWORD": os.getenv("DB_PASSWORD"),
-        "HOST": os.getenv("DB_HOST", "127.0.0.1"),
-        "PORT": os.getenv("DB_PORT", "5432"),
-    }
+from .config import Config
+
+
+BASE_DIR = Path(__file__).resolve().parent.parent
+load_dotenv(BASE_DIR / ".env")
+
+# --- Default Configuration ---
+DEFAULTS = {
+    "DEBUG": True,
+    "SECRET_KEY": None,
+    "ALLOWED_HOSTS": ["127.0.0.1", "localhost"],
+    "CORS_ALLOWED_ORIGINS": ["http://localhost:5173", "http://127.0.0.1:5173"],
+    "SESSION": {
+        "COOKIE_AGE": 2592000,  # 30 days
+        "SAVE_EVERY_REQUEST": True,
+    },
+    "AUTH": {
+        "OTP_TIMEOUT": 120,
+        "TEMP_TOKEN_TIMEOUT": 600,
+        "TOKEN_RATE_LIMIT": 5,
+        "TOKEN_RATE_LIMIT_TIME": 600,
+        "PASSWORD_LENGTH_MIN": 10,
+        "PASSWORD_LENGTH_MAX": 32,
+        "EMAIL_DOMAIN_NAME": "sjtu.edu.cn",
+    },
+    "DATABASE": {"URL": "sqlite:///db.sqlite3"},
+    "REDIS": {"URL": "redis://localhost:6379/0", "MAX_CONNECTIONS": 100},
+    "TURNSTILE_SECRET_KEY": None,
+    "QUEST": {
+        "BASE_URL": "https://wj.sjtu.edu.cn/api/v1/public/export",
+        "SIGNUP": {
+            "API_KEY": None,
+            "URL": None,
+            "QUESTIONID": None,
+        },
+        "LOGIN": {
+            "API_KEY": None,
+            "URL": None,
+            "QUESTIONID": None,
+        },
+        "RESET": {
+            "API_KEY": None,
+            "URL": None,
+            "QUESTIONID": None,
+        },
+    },
+    "AUTO_IMPORT_CRAWLED_DATA": True,
 }
 
+config = Config(config_path=BASE_DIR / "config.yaml", defaults=DEFAULTS)
 
-CELERY_BROKER_URL = os.environ["REDIS_URL"]
-
-
-# Static files (CSS, JavaScript, Images)
-# https://docs.djangoproject.com/en/5.0/howto/static-files/
-STATICFILES_DIRS = (os.path.join(BASE_DIR, "static"),)
 
-ROOT_ASSETS_DIR = os.path.join(BASE_DIR, "root_assets")
+# ==============================================================================
+#  MANAGED SETTINGS (env > config.yaml > defaults)
+# ==============================================================================
 
-SESSION_COOKIE_SECURE = not DEBUG
+# --- Core Security & Behavior ---
+SECRET_KEY = config.get("SECRET_KEY")
+DEBUG = config.get("DEBUG", cast=bool)
+ALLOWED_HOSTS = config.get("ALLOWED_HOSTS", cast=list)
+CORS_ALLOWED_ORIGINS = config.get("CORS_ALLOWED_ORIGINS", cast=list)
 
+# --- Infrastructure ---
+DATABASES = {"default": dj_database_url.parse(config.get("DATABASE.URL"))}
 CACHES = {
     "default": {
         "BACKEND": "django_redis.cache.RedisCache",
-        "LOCATION": os.getenv("REDIS_URL", "redis://127.0.0.1:6379/1"),
+        "LOCATION": config.get("REDIS.URL"),
         "OPTIONS": {
             "CLIENT_CLASS": "django_redis.client.DefaultClient",
-            "CONNECTION_POOL_KWARGS": {"max_connections": 100},
+            "CONNECTION_POOL_KWARGS": {
+                "max_connections": config.get("REDIS.MAX_CONNECTIONS", cast=int)
+            },
         },
         "KEY_PREFIX": "coursereview",
     }
 }
+
+# --- Session Management ---
+SESSION_COOKIE_AGE = config.get("SESSION.COOKIE_AGE", cast=int)
+SESSION_SAVE_EVERY_REQUEST = config.get("SESSION.SAVE_EVERY_REQUEST", cast=bool)
+SESSION_COOKIE_SECURE = not DEBUG
+
+# --- Application-Specific Settings ---
+AUTH = config.get("AUTH")
+TURNSTILE_SECRET_KEY = config.get("TURNSTILE_SECRET_KEY")
+AUTO_IMPORT_CRAWLED_DATA = config.get("AUTO_IMPORT_CRAWLED_DATA", cast=bool)
+
+QUEST = config.get("QUEST")
+
+
+# ==============================================================================
+#  DJANGO FRAMEWORK SETTINGS
+# ==============================================================================
+# These settings define the application's structure and are not meant to be
+# configured.
+
+INSTALLED_APPS = [
+    "django.contrib.admin",
+    "django.contrib.auth",
+    "django.contrib.contenttypes",
+    # django admin requires django.contrib.staticfiles to be in INSTALLED_APPS
+    "django.contrib.staticfiles",
+    "django.contrib.sessions",
+    "django.contrib.messages",
+    "django.contrib.humanize",
+    "debug_toolbar",
+    "rest_framework",
+    "corsheaders",
+    "apps.spider",
+    "apps.web",
+    "apps.auth",
+]
+
+MIDDLEWARE = [
+    "corsheaders.middleware.CorsMiddleware",
+    "django.middleware.security.SecurityMiddleware",
+    "django.contrib.sessions.middleware.SessionMiddleware",
+    "django.middleware.common.CommonMiddleware",
+    "django.middleware.csrf.CsrfViewMiddleware",
+    "django.contrib.auth.middleware.AuthenticationMiddleware",
+    "django.contrib.messages.middleware.MessageMiddleware",
+    "django.middleware.clickjacking.XFrameOptionsMiddleware",
+    "debug_toolbar.middleware.DebugToolbarMiddleware",
+]
+
+ROOT_URLCONF = "website.urls"
+WSGI_APPLICATION = "website.wsgi.application"
+TEMPLATES = [
+    {
+        "BACKEND": "django.template.backends.django.DjangoTemplates",
+        "DIRS": [],
+        "APP_DIRS": True,
+        "OPTIONS": {
+            "context_processors": [
+                "django.template.context_processors.debug",
+                "django.template.context_processors.request",
+                "django.contrib.auth.context_processors.auth",
+                "django.contrib.messages.context_processors.messages",
+            ]
+        },
+    }
+]
+
+STATIC_URL = "/dummy/"  # Required by Django staticfiles but not used in this setup
+DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
+
+LANGUAGE_CODE = "en-us"
+TIME_ZONE = "Asia/Shanghai"
+USE_I18N = True
+USE_TZ = True
+
+SESSION_ENGINE = "django.contrib.sessions.backends.cache"
+SESSION_CACHE_ALIAS = "default"
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        "NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator"
+    },
+    {"NAME": "django.contrib.auth.password_validation.MinimumLengthValidator"},
+    {"NAME": "django.contrib.auth.password_validation.CommonPasswordValidator"},
+    {"NAME": "django.contrib.auth.password_validation.NumericPasswordValidator"},
+]
+
+if DEBUG:
+    CORS_ALLOW_ALL_ORIGINS = True
+else:
+    CORS_ALLOW_ALL_ORIGINS = False
diff --git a/website/urls.py b/website/urls.py
index f533d93..9ca4cfb 100644
--- a/website/urls.py
+++ b/website/urls.py
@@ -4,8 +4,6 @@
 
 
 from apps.auth import views as auth_views
-from apps.analytics import views as aviews
-from apps.recommendations import views as rviews
 from apps.spider import views as spider_views
 from apps.web import views
 
@@ -40,15 +38,6 @@
     # administrative
     re_path(r"^admin/", admin.site.urls),
     re_path(r"^api/user/status/?", views.user_status, name="user_status"),
-    re_path(r"^analytics/$", aviews.home, name="analytics_home"),
-    re_path(
-        r"^eligible_for_recommendations/$",
-        aviews.eligible_for_recommendations,
-        name="eligible_for_recommendations",
-    ),
-    re_path(
-        r"^sentiment_labeler/$", aviews.sentiment_labeler, name="sentiment_labeler"
-    ),
     # spider
     re_path(r"^spider/data/$", spider_views.crawled_data_list, name="crawled_datas"),
     re_path(
@@ -107,6 +96,4 @@
         views.course_review_search_api,
         name="course_review_search_api",
     ),
-    # recommendations
-    re_path(r"^recommendations/?", rviews.recommendations, name="recommendations"),
 ]