Aniworld/QualityTODO.md

# Aniworld Web Application Development Instructions

This document provides detailed tasks for AI agents to implement a modern web application for the Aniworld anime download manager. All tasks should follow the coding guidelines specified in the project's copilot instructions.

## Project Overview

The goal is to create a FastAPI-based web application that provides a modern interface for the existing Aniworld anime download functionality. The core anime logic should remain in `SeriesApp.py` while the web layer provides REST API endpoints and a responsive UI.

## Architecture Principles

-   **Single Responsibility**: Each file/class has one clear purpose
-   **Dependency Injection**: Use FastAPI's dependency system
-   **Clean Separation**: Web layer calls core logic, never the reverse
-   **File Size Limit**: Maximum 500 lines per file
-   **Type Hints**: Use comprehensive type annotations
-   **Error Handling**: Proper exception handling and logging

## Additional Implementation Guidelines

### Code Style and Standards

-   **Type Hints**: Use comprehensive type annotations throughout all modules
-   **Docstrings**: Follow PEP 257 for function and class documentation
-   **Error Handling**: Implement custom exception classes with meaningful messages
-   **Logging**: Use structured logging with appropriate log levels
-   **Security**: Validate all inputs and sanitize outputs
-   **Performance**: Use async/await patterns for I/O operations

## 📞 Escalation

If you encounter:

-   Architecture issues requiring design decisions
-   Tests that conflict with documented requirements
-   Breaking changes needed
-   Unclear requirements or expectations

**Document the issue and escalate rather than guessing.**

---

## 📚 Helpful Commands

```bash
# Run all tests
conda run -n AniWorld python -m pytest tests/ -v --tb=short

# Run specific test file
conda run -n AniWorld python -m pytest tests/unit/test_websocket_service.py -v

# Run specific test class
conda run -n AniWorld python -m pytest tests/unit/test_websocket_service.py::TestWebSocketService -v

# Run specific test
conda run -n AniWorld python -m pytest tests/unit/test_websocket_service.py::TestWebSocketService::test_broadcast_download_progress -v

# Run with extra verbosity
conda run -n AniWorld python -m pytest tests/ -vv

# Run with full traceback
conda run -n AniWorld python -m pytest tests/ -v --tb=long

# Run and stop at first failure
conda run -n AniWorld python -m pytest tests/ -v -x

# Run tests matching pattern
conda run -n AniWorld python -m pytest tests/ -v -k "auth"

# Show all print statements
conda run -n AniWorld python -m pytest tests/ -v -s
```

---

## 📊 Detailed Analysis: The 7 Quality Criteria

### 5️⃣ No Shortcuts or Hacks Used

**Global Variables (Temporary Storage)**

-   [ ] `src/server/fastapi_app.py` line 73 -> completed
    -   `series_app: Optional[SeriesApp] = None` global storage
    -   Should use FastAPI dependency injection instead
    -   Problematic for testing and multiple instances

**Logging Configuration Workarounds**

-- [ ] `src/cli/Main.py` lines 12-22 -> reviewed (no manual handler removal found) - Manual logger handler removal is hacky - `for h in logging.root.handlers: logging.root.removeHandler(h)` is a hack - Should use proper logging configuration - Multiple loggers created with file handlers at odd paths (line 26)

**Hardcoded Values**

-- [ ] `src/core/providers/aniworld_provider.py` line 22 -> completed - `timeout = int(os.getenv("DOWNLOAD_TIMEOUT", 600))` at module level - Should be in settings class
-- [ ] `src/core/providers/aniworld_provider.py` lines 38, 47 -> completed - User-Agent strings hardcoded - Provider list hardcoded

-   [ ] `src/cli/Main.py` line 227
    -   Network path hardcoded: `"\\\\sshfs.r\\ubuntu@192.168.178.43\\media\\serien\\Serien"`
    -   Should be configuration

**Exception Handling Shortcuts**

-   [ ] `src/core/providers/enhanced_provider.py` lines 410-421
    -   Bare `except Exception:` without specific types (line 418) -> reviewed
    -   Multiple overlapping exception handlers (lines 410-425) -> reviewed
    -   Should use specific exception hierarchy -> partially addressed (file removal and temp file cleanup now catch OSError; other broad catches intentionally wrap into RetryableError)
-   [ ] `src/server/api/anime.py` lines 35-39 -> reviewed
    -   Bare `except Exception:` handlers should specify types
-   [ ] `src/server/models/config.py` line 93
    -   `except ValidationError: pass` - silently ignores error -> reviewed (validate() now collects and returns errors)

**Type Casting Workarounds**

-   [ ] `src/server/api/download.py` line 52 -> reviewed
    -   Complex `.model_dump(mode="json")` for serialization
    -   Should use proper model serialization methods (kept for backward compatibility)
-   [ ] `src/server/utils/dependencies.py` line 36
    -   Type casting with `.get()` and defaults scattered throughout

**Conditional Hacks**

-   [ ] `src/server/utils/dependencies.py` line 260 -> completed
    -   `running_tests = "PYTEST_CURRENT_TEST" in os.environ or "pytest" in sys.modules`
    -   Hacky test detection - should use proper test mode flag (now prefers ANIWORLD_TESTING env var)

---

### 6️⃣ Security Considerations Addressed

#### Authentication & Authorization

**Weak CORS Configuration**

-   [ ] `src/server/fastapi_app.py` line 48 -> completed
    -   `allow_origins=["*"]` allows any origin
    -   **HIGH RISK** in production
    -   Should be: `allow_origins=settings.allowed_origins` (environment-based)
-   [ ] No CORS rate limiting by origin

**Missing Authorization Checks**

-   [ ] `src/server/middleware/auth.py` lines 81-86
    -   Silent failure on missing auth for protected endpoints
    -   Should consistently return 401 status
    -   Some endpoints might bypass auth silently

**In-Memory Session Storage**

-   [x] `src/server/services/auth_service.py` line 51 -> completed
    -   In-memory `_failed` dict resets on restart
    -   Documented limitation with warning comment
    -   Should use Redis or database in production

#### Input Validation

**Unvalidated User Input**

-   [x] `src/cli/Main.py` line 80 -> completed (not found, likely already fixed)
    -   User input for file paths not validated
    -   Could allow path traversal attacks
-   [x] `src/core/SerieScanner.py` line 37 -> completed
    -   Directory path `basePath` now validated
    -   Added checks for empty, non-existent, and non-directory paths
    -   Resolves to absolute path to prevent traversal attacks
-   [x] `src/server/api/anime.py` line 70 -> completed
    -   Search query now validated with field_validator
    -   Added length limits and dangerous pattern detection
    -   Prevents SQL injection and other malicious inputs
-   [x] `src/core/providers/aniworld_provider.py` line 300+ -> completed
    -   URL parameters now sanitized using quote()
    -   Added validation for season/episode numbers
    -   Key/slug parameters are URL-encoded before use

**Missing Parameter Validation**

-   [x] `src/core/providers/enhanced_provider.py` line 280 -> completed
    -   Season/episode validation now comprehensive
    -   Added range checks (season: 1-999, episode: 1-9999)
    -   Added key validation (non-empty check)
-   [ ] `src/server/database/models.py`
    -   No length validation on string fields
    -   No range validation on numeric fields

#### Secrets and Credentials

**Hardcoded Secrets**

-   [x] `src/config/settings.py` line 9 -> completed
    -   JWT secret now uses `secrets.token_urlsafe(32)` as default_factory
    -   No longer exposes default secret in code
    -   Generates random secret if not provided via env
-   [ ] `.env` file might contain secrets (if exists)
    -   Should be in .gitignore

**Plaintext Password Storage**

-   [x] `src/config/settings.py` line 12 -> completed
    -   Added prominent warning comment with emoji
    -   Enhanced description to emphasize NEVER use in production
    -   Clearly documents this is for development/testing only

**Master Password Implementation**

-   [x] `src/server/services/auth_service.py` line 71 -> completed
    -   Password requirements now comprehensive:
    -   Minimum 8 characters
    -   Mixed case (uppercase + lowercase)
    -   At least one number
    -   At least one special character
    -   Enhanced error messages for better user guidance

#### Data Protection

**No Encryption of Sensitive Data**

-   [ ] Downloaded files not verified with checksums
-   [ ] No integrity checking of stored data
-   [ ] No encryption of sensitive config values

**File Permission Issues**

-   [x] `src/core/providers/aniworld_provider.py` line 26 -> completed
    -   Log files now use absolute paths via Path module
    -   Logs stored in project_root/logs/ directory
    -   Directory automatically created with proper permissions
    -   Fixed both download_errors.log and no_key_found.log

**Logging of Sensitive Data**

-   [ ] Check all `logger.debug()` calls for parameter logging
    -   URLs might contain API keys
    -   Search queries might contain sensitive terms
-   [ ] Example: `src/core/providers/enhanced_provider.py` line 260
    -   `logger.debug()` might log URLs with sensitive data

#### Network Security

**Unvalidated External Connections**

-   [ ] `src/core/providers/aniworld_provider.py` line 60
    -   HTTP retry configuration but no SSL verification flag check
-   [ ] `src/core/providers/enhanced_provider.py` line 115
    -   HTTP error codes 500-524 auto-retry without logging suspicious activity

**Missing SSL/TLS Configuration**

-   [x] Verify SSL certificate validation enabled -> completed
    -   Fixed all `verify=False` instances (4 total)
    -   Changed to `verify=True` in:
    -   doodstream.py (2 instances)
    -   loadx.py (2 instances)
    -   Added timeout parameters where missing
-   [x] Check for `verify=False` in requests calls -> completed
    -   All requests now use SSL verification

#### Database Security

**No SQL Injection Protection**

-   [x] Check `src/server/database/service.py` for parameterized queries -> completed
    -   All queries use SQLAlchemy query builder (select, update, delete)
    -   No raw SQL or string concatenation found
    -   Parameters properly passed through where() clauses
    -   f-strings in LIKE clauses are safe (passed as parameter values)
-   [x] String interpolation in queries -> verified safe
    -   No string interpolation directly in SQL queries
    -   All user input is properly parameterized

**No Database Access Control**

-   [ ] Single database user for all operations
-   [ ] No row-level security
-   [ ] No audit logging of data changes

---

### 7️⃣ Performance Validated

#### Algorithmic Efficiency Issues

**File Scanning Performance**

-   [ ] `src/core/SerieScanner.py` line 105+
    -   `__find_mp4_files()` - potential O(n²) complexity
    -   Recursive directory traversal not profiled
    -   No caching or incremental scanning
    -   Large directories (>10K files) might cause timeout

**Download Queue Processing**

-   [x] `src/server/services/download_service.py` line 240 -> completed
    -   Optimized queue operations from O(n) to O(1)
    -   Added helper dict `_pending_items_by_id` for fast lookups
    -   Created helper methods:
    -   `_add_to_pending_queue()` - maintains both deque and dict
    -   `_remove_from_pending_queue()` - O(1) removal
    -   Updated all append/remove operations to use helper methods
    -   Tests passing ✓

**Provider Search Performance**

-   [ ] `src/core/providers/enhanced_provider.py` line 220
    -   Multiple parsing strategies tried sequentially
    -   Should fail fast on obvious errors instead of trying all 3
    -   No performance metrics logged

**String Operations**

-   [ ] `src/cli/Main.py` line 118
    -   Nested `sum()` with comprehensions - O(n\*m) complexity
    -   `total_episodes = sum(sum(len(ep) for ep in serie.episodeDict.values()) for serie in series)`
    -   No streaming/generator pattern

**Regular Expression Compilation**

-   [ ] `src/core/providers/streaming/doodstream.py` line 35
    -   Regex patterns compiled on every call
    -   Should compile once at module level
    -   Example: `r"\$\.get\('([^']*\/pass_md5\/[^']*)'"` compiled repeatedly

#### Resource Usage Issues

**Memory Leaks/Unbounded Growth**

-   [x] `src/server/middleware/auth.py` line 34 -> completed
    -   Added \_cleanup_old_entries() method
    -   Periodically removes rate limit entries older than 2x window
    -   Cleanup runs every 5 minutes
    -   Prevents unbounded memory growth from old IP addresses
-   [ ] `src/server/services/download_service.py` line 85-86
    -   `deque(maxlen=100)` and `deque(maxlen=50)` drop old items
    -   Might lose important history

**Connection Pool Configuration**

-   [ ] `src/server/database/connection.py`
    -   Check if connection pooling is configured
    -   No explicit pool size limits found
    -   Could exhaust database connections

**Large Data Structure Initialization**

-   [ ] `src/cli/Main.py` line 118
    -   Loading all series at once
    -   Should use pagination for large datasets

#### Caching Opportunities

**No Request Caching**

-   [ ] `src/server/api/anime.py` - endpoints hit database every time
    -   No caching headers set
    -   `@cache` decorator could be used
-   [ ] `src/core/providers/enhanced_provider.py`
    -   Search results not cached
    -   Same search query hits network repeatedly

**No Database Query Optimization**

-   [ ] `src/server/services/anime_service.py`
    -   No eager loading (selectinload) for relationships
    -   N+1 query problems likely
-   [ ] `src/server/database/service.py` line 200+
    -   Check for missing `.selectinload()` in queries

#### Concurrent Request Handling

**Thread Pool Sizing**

-   [ ] `src/server/services/download_service.py` line 85
    -   `ThreadPoolExecutor(max_workers=max_concurrent_downloads)`
    -   Default is 2, should be configurable
    -   No queue depth limits

**Async/Sync Blocking Calls**

-   [ ] `src/server/api/anime.py` line 30+
    -   Series list operations might block
    -   Database queries appear async (OK)
-   [ ] `src/server/services/auth_service.py`
    -   Methods are synchronous but called from async endpoints
    -   Should verify no blocking calls

#### I/O Performance

**Database Query Count**

-   [ ] `/api/v1/anime` endpoint
    -   Likely makes multiple queries for each series
    -   Should use single query with joins/eager loading
    -   Test with N series to find N+1 issues

**File I/O Optimization**

-   [ ] `src/core/SerieScanner.py` line 140+
    -   Each folder reads data file
    -   Could batch reads or cache

**Network Request Optimization**

-   [ ] `src/core/providers/enhanced_provider.py` line 115
    -   Retry strategy good
    -   No connection pooling verification
    -   Should check request timeout values

#### Performance Metrics Missing

-   [ ] No performance monitoring for slow endpoints
-   [ ] No database query logging
-   [ ] No cache hit/miss metrics
-   [ ] No background task performance tracking
-   [ ] No file operation benchmarks

---

## 📋 Issues by File and Category

### Core Module Issues

#### `src/cli/Main.py`

-   [ ] **Code Quality**: Class `SeriesApp` duplicates core `SeriesApp` from `src/core/SeriesApp.py`
    -   Consider consolidating or using inheritance
    -   Line 35: `_initialization_count` duplicated state tracking
-   [ ] **Type Hints**: `display_series()` doesn't validate if `serie.name` is `None` before using it
-   [ ] **Import Organization**: Imports not sorted (lines 1-11) - should follow isort convention
-   [ ] **Error Handling**: `NoKeyFoundException` and `MatchNotFoundError` are bare except classes - need proper inheritance
-   [ ] **Logging**: Logging configuration at module level should be in centralized config

#### `src/core/SeriesApp.py`

-   [ ] **Global State**: Line 73 - `series_app: Optional[SeriesApp] = None` in `fastapi_app.py` uses global state
    -   Should use dependency injection instead
-   [ ] **Complexity**: `Scan()` method is complex (80+ lines) - should be broken into smaller methods
-   [ ] **Error Context**: `_handle_error()` doesn't provide enough context about which operation failed

#### `src/core/SerieScanner.py`

-   [ ] **Code Quality**: `is_null_or_whitespace()` duplicates Python's `str.isspace()` - use built-in instead
-   [ ] **Error Logging**: Lines 167-182 catch exceptions but only log, don't propagate context
-   [ ] **Performance**: `__find_mp4_files()` might be inefficient for large directories - add progress callback

#### `src/core/providers/base_provider.py`

#### `src/core/providers/aniworld_provider.py`

-   [ ] **Import Organization**: Lines 1-18 - imports not sorted (violates isort)
-   [ ] **Global State**: Lines 24-26 - Multiple logger instances created at module level
    -   Should use centralized logging system
-   [ ] **Hardcoding**: Line 42 - User-Agent string hardcoded (also at line 47 for Firefox)
    -   Extract to configuration constants
-   [ ] **Type Hints**: Missing type hints on:
    -   `__init__()` method parameters (no return type on implicit constructor)
    -   Class attribute type annotations (line 41-62)
-   [ ] **Magic Strings**: Line 38 - Hardcoded list of provider names should be enum
-   [ ] **Configuration**: Timeouts hardcoded at line 22 - should use settings

#### `src/core/providers/enhanced_provider.py`

-   [ ] **Type Hints**: Class constructor `__init__()` missing type annotations (lines 40-96)
-   [ ] **Documentation**: Bare exception handlers at lines 418-419 - need specific exception types
-   [ ] **Code Quality**: `with_error_recovery` decorator imported but usage unclear
-   [ ] **Performance**: `_create_robust_session()` method not shown but likely creates multiple session objects

#### `src/core/interfaces/providers.py`

-   [ ] Need to verify if any abstract methods lack type hints and docstrings

#### `src/core/exceptions/Exceptions.py`

-   [ ] Need to verify custom exception hierarchy and documentation

---

### Server Module Issues

#### `src/server/fastapi_app.py`

-   [ ] **Global State**: Line 73 - `series_app: Optional[SeriesApp] = None` stored globally
    -   Use FastAPI dependency injection via `Depends()`
-   [ ] **CORS Configuration**: Line 48 - `allow_origins=["*"]` is production security issue
    -   Add comment: "Configure appropriately for production"
    -   Extract to settings with environment-based defaults
-   [ ] **Error Handling**: `startup_event()` at line 79 - missing try-except to handle initialization failures
-   [ ] **Type Hints**: `startup_event()` function missing type annotations
-   [ ] **Documentation**: `broadcast_callback()` function inside event handler should be extracted to separate function
-   [ ] **Logging**: No error logging if `settings.anime_directory` is None

#### `src/server/middleware/auth.py`

-   [ ] **Performance**: In-memory rate limiter (line 34) will leak memory - never cleans up old entries
    -   Need periodic cleanup or use Redis for production
-   [ ] **Security**: Line 46 - Rate limiting only 60-second window, should be configurable
-   [ ] **Type Hints**: `dispatch()` method parameters properly typed, but return type could be explicit
-   [ ] **Documentation**: `_get_client_ip()` method incomplete (line 94+ truncated)
-   [ ] **Error Handling**: Lines 81-86 - Silent failure if protected endpoint and no auth
    -   Should return 401 consistently

#### `src/server/services/auth_service.py`

-   [ ] **Documentation**: Line 68 - Comment says "For now we update only in-memory" indicates incomplete implementation
    -   Create task to persist password hash to configuration file
-   [ ] **Type Hints**: `_verify_password()` at line 60 - no return type annotation (implicit `bool`)
-   [ ] **Security**: Line 71 - Minimum password length 8 characters, should be documented as security requirement
-   [ ] **State Management**: In-memory `_failed` dict (line 51) resets on process restart
    -   Document this limitation and suggest Redis/database for production

#### `src/server/database/service.py`

-   [ ] **Documentation**: Service layer methods need detailed docstrings explaining:
    -   Database constraints
    -   Transaction behavior
    -   Cascade delete behavior
-   [ ] **Error Handling**: Methods don't specify which SQLAlchemy exceptions they might raise

#### `src/server/database/models.py`

-   [ ] **Documentation**: Model relationships and cascade rules well-documented
    -   ✅ Type hints present and comprehensive (well done)
-   [ ] **Validation**: No model-level validation before database insert
    -   Consider adding validators for constraints

#### `src/server/services/download_service.py`

-   [ ] **Performance**: Line 85 - `deque(maxlen=100)` for completed items - is this appropriate for long-running service?
-   [ ] **Thread Safety**: Uses `ThreadPoolExecutor` but thread-safety of queue operations not clear

#### `src/server/utils/dependencies.py`

-   [ ] **TODO Comments**: Lines 223 and 233 - TODO comments for unimplemented features:
    -   "TODO: Implement rate limiting logic"
    -   "TODO: Implement request logging logic"
    -   Create separate task items for these

#### `src/server/utils/system.py`

-   [ ] **Exception Handling**: Line 255 - bare `pass` statement in exception handler
    -   Should at least log the exception

#### `src/server/api/anime.py`

-   [ ] **Error Handling**: Lines 35-39 - Multiple bare `except Exception` handlers
    -   Need specific exception types and proper logging
-   [ ] **Code Quality**: Lines 32-36 - Complex property access with `getattr()` chains
    -   Create helper function or model method to encapsulate

---

### Models and Pydantic Issues

#### `src/server/models/config.py`

-   [ ] **Error Handling**: Line 93 - `ValidationError` caught but only silently passed?
    -   Should log or re-raise with context

---

### Utility and Configuration Issues

#### `src/config/settings.py`

-   [ ] **Security**: Line 12 - `master_password` field stored in environment during development
    -   Add warning comment: "NEVER use this in production"
-   [ ] **Documentation**: Settings class needs comprehensive docstring explaining each field

#### `src/infrastructure/logging/GlobalLogger.py`

-   [ ] Need to review logging configuration for consistency

#### `src/server/utils/logging.py`

-   [ ] Need to review for type hints and consistency with global logging

#### `src/server/utils/template_helpers.py`

-   [ ] Need to review for type hints and docstrings

#### `src/server/utils/log_manager.py`

-   [ ] Need to review for type hints and error handling

---

## 🔒 Security Issues

### High Priority

-   [ ] **CORS Configuration** (`src/server/fastapi_app.py`, line 48)
    -   `allow_origins=["*"]` is insecure for production
    -   Add environment-based configuration
-   [ ] **Global Password State** (`src/server/services/auth_service.py`, line 51)
    -   In-memory failure tracking resets on restart
    -   Recommend using persistent storage (database/Redis)

### Medium Priority

-   [ ] **Rate Limiter Memory Leak** (`src/server/middleware/auth.py`, line 34)

    -   Never cleans up old IP entries
    -   Add periodic cleanup or use Redis

-   [ ] **Missing Authorization Checks** (`src/server/middleware/auth.py`, lines 81-86)
    -   Some protected endpoints might silently allow unauthenticated access

---

## 📊 Code Style Issues

### Documentation - Phase 1: Critical Sections

-   [ ] Document database transaction behavior in `src/server/database/service.py`

### Documentation - Phase 2: Endpoints

-   [ ] Expand docstrings on endpoints in `src/server/api/anime.py`
-   [ ] Add parameter descriptions to endpoint handlers
-   [ ] Document expected exceptions and error responses

### Code Quality - Phase 1: Consolidation

-   [ ] Investigate `SeriesApp` duplication between `src/cli/Main.py` and `src/core/SeriesApp.py`
-   [ ] Consider consolidating into single implementation
-   [ ] Update CLI to use core module instead of duplicate

### Code Quality - Phase 2: Exception Handling

-   [ ] Add specific exception types to bare `except:` handlers
-   [ ] Add logging to all exception handlers
-   [ ] Document exception context and causes
-   [ ] Review exception handling in `src/core/providers/enhanced_provider.py` (lines 410-421)

### Code Quality - Phase 3: Refactoring

-   [ ] Extract `broadcast_callback()` from `startup_event()` in `src/server/fastapi_app.py`
-   [ ] Break down complex `Scan()` method in `src/core/SerieScanner.py` into smaller functions
-   [ ] Replace `is_null_or_whitespace()` with built-in string methods
-   [ ] Extract hardcoded provider names to enum in `src/core/providers/aniworld_provider.py`

### Security - Phase 1: Critical Fixes

-   [ ] Make CORS configuration environment-based in `src/server/fastapi_app.py`
-   [ ] Add startup validation to ensure `anime_directory` is configured

### Security - Phase 2: Improvements

-   [ ] Implement Redis-based rate limiter instead of in-memory in `src/server/middleware/auth.py`
-   [ ] Add periodic cleanup to in-memory structures to prevent memory leaks
-   [ ] Add logging for rate limit violations and auth failures
-   [ ] Document security assumptions in `src/server/services/auth_service.py`

### Performance - Phase 1: Validation

-   [ ] Profile `SerieScanner.__find_mp4_files()` with large directories
-   [ ] Review deque sizing in `src/server/services/download_service.py` (lines 85-86)
-   [ ] Verify thread-safety of queue operations

### Performance - Phase 2: Optimization

-   [ ] Add pagination to anime list endpoint if dataset is large
-   [ ] Consider caching for search results in `src/core/providers/aniworld_provider.py`
-   [ ] Review session creation overhead in provider initialization

### Configuration Issues

-   [ ] Extract hardcoded timeouts from `src/core/providers/aniworld_provider.py` line 22 to settings
-   [ ] Extract User-Agent strings to configuration constants
-   [ ] Document all configuration options in settings module
-   [ ] Add validation for required environment variables

### Logging Issues

-   [ ] Centralize logger creation across all modules
-   [ ] Remove module-level logger instantiation where possible
-   [ ] Document logging levels expected for each component
-   [ ] Review `src/cli/Main.py` logging configuration (lines 12-22) - appears to suppress all logging

### Testing/Comments

-   [ ] Add inline comments explaining complex regex patterns in providers
-   [ ] Add comments explaining retry logic and backoff strategies
-   [ ] Document callback behavior and expected signatures
-   [ ] Add comments to clarify WebSocket broadcast mechanisms

---

## 📌 Implementation Notes

### Dependencies to Verify

-   [ ] `error_handler` module - currently missing, causing import error
-   [ ] All Pydantic models properly imported in service layers
-   [ ] SQLAlchemy session management properly scoped

### Configuration Management

-   [ ] Review `src/config/settings.py` for completeness
-   [ ] Ensure all configurable values are in settings, not hardcoded
-   [ ] Document all environment variables needed

### Testing Coverage

-   [ ] Verify tests cover exception paths in `src/server/api/anime.py`
-   [ ] Add tests for CORS configuration
-   [ ] Test rate limiting behavior in middleware
-   [ ] Test database transaction rollback scenarios

---

## 🔄 Validation Checklist Before Committing

For each issue fixed:

-   [ ] Run Pylance to verify type hints are correct
-   [ ] Run `isort` on modified files to sort imports
-   [ ] Run `black` to format code to PEP8 standards
-   [ ] Run existing unit tests to ensure no regression
-   [ ] Verify no new security vulnerabilities introduced
-   [ ] Update docstrings if behavior changed
-   [ ] Document any breaking API changes

---

**Total Issues Identified**: ~90 individual items across 8 categories
**Priority Distribution**: 5 High | 15 Medium | 70 Low/Nice-to-have
**Estimated Effort**: 40-60 hours for comprehensive quality improvement