fixing db error and upgrading technical documentation

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+# 23 - DAV Integration
+
+WebDAV, CalDAV, and CardDAV extend the platform to support clients and devices that speak these standard protocols. The implementation follows the existing hexagonal architecture -- each protocol gets its own adapter, service, and domain layer.
+
+## Table of Contents
+
+1. [Introduction](#introduction)
+2. [Implementation Architecture](#implementation-architecture)
+3. [WebDAV](#webdav)
+4. [CalDAV](#caldav)
+5. [CardDAV](#carddav)
+6. [Security Considerations](#security-considerations)
+7. [Testing and Compatibility](#testing-and-compatibility)
+
+## Introduction
+
+### WebDAV (Web Distributed Authoring and Versioning)
+An HTTP extension that lets clients create, modify, move, and delete files and directories on a remote server.
+
+### CalDAV (Calendaring Extensions to WebDAV)
+A WebDAV-based protocol for accessing and managing calendar data (events and tasks).
+
+### CardDAV (vCard Extensions to WebDAV)
+Extends WebDAV to allow access and management of contact data in vCard format.
+
+## Implementation Architecture
+
+DAV protocols plug into the existing hexagonal architecture:
+
+```
+┌────────────────────────────────────────────────────────────────────┐
+│                          INTERFACES                                │
+│                                                                    │
+│  ┌───────────────┐  ┌───────────────┐  ┌───────────────────────┐  │
+│  │               │  │               │  │                       │  │
+│  │  REST API     │  │  WebDAV API   │  │  CalDAV/CardDAV API   │  │
+│  │               │  │               │  │                       │  │
+│  └───────┬───────┘  └───────┬───────┘  └───────────┬───────────┘  │
+│          │                  │                      │              │
+└──────────┼──────────────────┼──────────────────────┼──────────────┘
+           │                  │                      │
+           ▼                  ▼                      ▼
+┌──────────────────────────────────────────────────────────────────┐
+│                          APPLICATION                             │
+│                                                                  │
+│  ┌───────────┐  ┌────────────┐  ┌───────────┐  ┌──────────────┐ │
+│  │           │  │            │  │           │  │              │ │
+│  │FileService│  │FolderService│  │CalendarSvc│  │ContactService│ │
+│  │           │  │            │  │           │  │              │ │
+│  └─────┬─────┘  └──────┬─────┘  └─────┬─────┘  └──────┬───────┘ │
+│        │               │              │               │         │
+└────────┼───────────────┼──────────────┼───────────────┼─────────┘
+         │               │              │               │
+         ▼               ▼              ▼               ▼
+┌────────────────────────────────────────────────────────────────┐
+│                          DOMAIN                                │
+│                                                                │
+│  ┌─────────┐  ┌──────────┐  ┌────────────┐  ┌───────────────┐ │
+│  │         │  │          │  │            │  │               │ │
+│  │  File   │  │  Folder  │  │  Calendar  │  │    Contact    │ │
+│  │         │  │          │  │            │  │               │ │
+│  └─────────┘  └──────────┘  └────────────┘  └───────────────┘ │
+│                                                                │
+└────────────────────────────────────────────────────────────────┘
+```
+
+### Main Components
+
+1. **DAV Adapters** -- convert between DAV specs and internal models
+2. **Application Services** -- extended to include DAV-specific functionality
+3. **Domain Models** -- new entities for **Calendar** and **Contact**
+4. **Repositories** -- storage implementations for calendars and contacts
+
+## WebDAV
+
+### Required Endpoints
+
+| HTTP Method | Endpoint | Description |
+|-------------|----------|-------------|
+| OPTIONS | /webdav/{path} | Reports supported WebDAV capabilities |
+| PROPFIND | /webdav/{path} | Retrieves resource properties |
+| PROPPATCH | /webdav/{path} | Modifies resource properties |
+| MKCOL | /webdav/{path} | Creates collections (directories) |
+| GET | /webdav/{path} | Retrieves resource content |
+| HEAD | /webdav/{path} | Retrieves resource metadata |
+| PUT | /webdav/{path} | Creates or updates resources |
+| DELETE | /webdav/{path} | Deletes resources |
+| COPY | /webdav/{path} | Copies resources |
+| MOVE | /webdav/{path} | Moves resources |
+| LOCK | /webdav/{path} | Locks resources |
+| UNLOCK | /webdav/{path} | Unlocks resources |
+
+### Implementation
+
+1. **WebDAV Handler**:
+
+```rust
+// src/interfaces/api/handlers/webdav_handler.rs
+use std::sync::Arc;
+use axum::{
+    Router,
+    routing::get,
+    extract::{Path, State, Request, Extension},
+    http::StatusCode,
+    response::Response,
+};
+use http::{Method, header};
+
+use crate::common::di::AppState;
+use crate::interfaces::middleware::auth::CurrentUser;
+use crate::application::ports::file_ports::{FileRetrievalUseCase, FileUploadUseCase};
+use crate::application::ports::folder_ports::FolderUseCase;
+use crate::common::errors::AppError;
+
+pub fn webdav_routes() -> Router<Arc<AppState>> {
+    Router::new()
+        .route("/webdav/*path", get(handle_get))
+        .route_with_tsr("/webdav/*path", axum::routing::on(
+            Method::OPTIONS, handle_options,
+            Method::PROPFIND, handle_propfind,
+            Method::PROPPATCH, handle_proppatch,
+            Method::MKCOL, handle_mkcol,
+            Method::PUT, handle_put,
+            Method::DELETE, handle_delete,
+            Method::COPY, handle_copy,
+            Method::MOVE, handle_move,
+            Method::LOCK, handle_lock,
+            Method::UNLOCK, handle_unlock,
+        ))
+}
+
+// Implement functions for each WebDAV method...
+```
+
+2. **WebDAV Adapter**:
+
+```rust
+// src/application/adapters/webdav_adapter.rs
+use xml::reader::{EventReader, XmlEvent};
+use xml::writer::{EventWriter, EmitterConfig, XmlEvent as WriteEvent};
+use std::io::{Read, Write};
+use crate::application::dtos::file_dto::FileDto;
+use crate::application::dtos::folder_dto::FolderDto;
+
+/// Converts between internal objects and WebDAV representations
+pub struct WebDavAdapter;
+
+impl WebDavAdapter {
+    /// Parses a PROPFIND XML property into a request object
+    pub fn parse_propfind<R: Read>(reader: R) -> Result<PropFindRequest, Error> {
+        // Implementation...
+    }
+
+    /// Generates PROPFIND XML response from files and folders
+    pub fn generate_propfind_response<W: Write>(
+        writer: W,
+        files: &[FileDto],
+        folders: &[FolderDto],
+        base_url: &str,
+    ) -> Result<(), Error> {
+        // Implementation...
+    }
+
+    // Other methods for different WebDAV operations...
+}
+```
+
+## CalDAV
+
+### Required Endpoints
+
+| HTTP Method | Endpoint | Description |
+|-------------|----------|-------------|
+| PROPFIND | /caldav/{calendar} | Retrieves calendar properties |
+| REPORT | /caldav/{calendar} | Queries calendar events |
+| MKCALENDAR | /caldav/{calendar} | Creates a new calendar |
+| PUT | /caldav/{calendar}/{event}.ics | Creates or updates an event |
+| GET | /caldav/{calendar}/{event}.ics | Retrieves an event |
+| DELETE | /caldav/{calendar}/{event}.ics | Deletes an event |
+
+### Implementation
+
+1. **Domain Entities**:
+
+```rust
+// src/domain/entities/calendar.rs
+use uuid::Uuid;
+use chrono::{DateTime, Utc};
+
+#[derive(Debug, Clone)]
+pub struct Calendar {
+    id: Uuid,
+    name: String,
+    owner_id: String,
+    description: Option<String>,
+    color: Option<String>,
+    created_at: DateTime<Utc>,
+    updated_at: DateTime<Utc>,
+}
+
+// src/domain/entities/calendar_event.rs
+use uuid::Uuid;
+use chrono::{DateTime, Utc};
+
+#[derive(Debug, Clone)]
+pub struct CalendarEvent {
+    id: Uuid,
+    calendar_id: Uuid,
+    summary: String,
+    description: Option<String>,
+    location: Option<String>,
+    start_time: DateTime<Utc>,
+    end_time: DateTime<Utc>,
+    all_day: bool,
+    rrule: Option<String>,  // Recurrence rule
+    ical_data: String,      // Full iCalendar data
+    created_at: DateTime<Utc>,
+    updated_at: DateTime<Utc>,
+}
+```
+
+2. **Repositories**:
+
+```rust
+// src/domain/repositories/calendar_repository.rs
+use async_trait::async_trait;
+use uuid::Uuid;
+use crate::domain::entities::calendar::Calendar;
+use crate::common::errors::Result;
+
+#[async_trait]
+pub trait CalendarRepository: Send + Sync {
+    async fn create_calendar(&self, calendar: Calendar) -> Result<Calendar>;
+    async fn get_calendar_by_id(&self, id: &Uuid) -> Result<Calendar>;
+    async fn get_calendars_by_owner(&self, owner_id: &str) -> Result<Vec<Calendar>>;
+    async fn update_calendar(&self, calendar: Calendar) -> Result<Calendar>;
+    async fn delete_calendar(&self, id: &Uuid) -> Result<()>;
+}
+
+// src/domain/repositories/calendar_event_repository.rs
+use async_trait::async_trait;
+use uuid::Uuid;
+use chrono::{DateTime, Utc};
+use crate::domain::entities::calendar_event::CalendarEvent;
+use crate::common::errors::Result;
+
+#[async_trait]
+pub trait CalendarEventRepository: Send + Sync {
+    async fn create_event(&self, event: CalendarEvent) -> Result<CalendarEvent>;
+    async fn get_event_by_id(&self, id: &Uuid) -> Result<CalendarEvent>;
+    async fn get_events_by_calendar(&self, calendar_id: &Uuid) -> Result<Vec<CalendarEvent>>;
+    async fn get_events_in_timerange(
+        &self,
+        calendar_id: &Uuid,
+        start: &DateTime<Utc>,
+        end: &DateTime<Utc>
+    ) -> Result<Vec<CalendarEvent>>;
+    async fn update_event(&self, event: CalendarEvent) -> Result<CalendarEvent>;
+    async fn delete_event(&self, id: &Uuid) -> Result<()>;
+}
+```
+
+3. **CalDAV Service**:
+
+```rust
+// src/application/services/calendar_service.rs
+use std::sync::Arc;
+use crate::application::ports::calendar_ports::CalendarStoragePort;
+use crate::application::dtos::calendar_dto::*;
+
+pub struct CalendarService {
+    storage: Arc<dyn CalendarStoragePort>,
+}
+
+impl CalendarService {
+    pub fn new(storage: Arc<dyn CalendarStoragePort>) -> Self {
+        Self { storage }
+    }
+
+    // Implements CalendarUseCase for calendar and event operations...
+}
+```
+
+4. **CalDAV Handler**:
+
+```rust
+// src/interfaces/api/handlers/caldav_handler.rs
+use std::sync::Arc;
+use axum::{
+    Router,
+    routing::{get, put, delete},
+    extract::{Path, State, Request, Extension},
+    http::StatusCode,
+    response::Response,
+};
+use http::{Method, header};
+
+use crate::common::di::AppState;
+use crate::interfaces::middleware::auth::CurrentUser;
+use crate::application::services::caldav_service::CalDavService;
+use crate::common::errors::AppError;
+
+pub fn caldav_routes() -> Router<Arc<AppState>> {
+    Router::new()
+        .route("/caldav/", get(get_calendars))
+        .route("/caldav/:calendar", get(get_calendar))
+        .route_with_tsr("/caldav/:calendar", axum::routing::on(
+            Method::PROPFIND, handle_calendar_propfind,
+            Method::REPORT, handle_calendar_report,
+            Method::MKCALENDAR, handle_mkcalendar,
+        ))
+        .route("/caldav/:calendar/:event", get(get_event))
+        .route("/caldav/:calendar/:event", put(put_event))
+        .route("/caldav/:calendar/:event", delete(delete_event))
+}
+
+// Implement functions for each CalDAV method...
+```
+
+## CardDAV
+
+### Required Endpoints
+
+| HTTP Method | Endpoint | Description |
+|-------------|----------|-------------|
+| PROPFIND | /carddav/addressbooks/{addressbook} | Retrieves address book properties |
+| REPORT | /carddav/addressbooks/{addressbook} | Queries contacts |
+| MKCOL | /carddav/addressbooks/{addressbook} | Creates a new address book |
+| PUT | /carddav/addressbooks/{addressbook}/{contact}.vcf | Creates or updates a contact |
+| GET | /carddav/addressbooks/{addressbook}/{contact}.vcf | Retrieves a contact |
+| DELETE | /carddav/addressbooks/{addressbook}/{contact}.vcf | Deletes a contact |
+
+### Implementation
+
+1. **Domain Entities**:
+
+```rust
+// Note: AddressBook and Contact are both defined in src/domain/entities/contact.rs
+
+#[derive(Debug, Clone)]
+pub struct AddressBook {
+    id: Uuid,
+    name: String,
+    owner_id: String,
+    description: Option<String>,
+    color: Option<String>,
+    is_public: bool,
+    created_at: DateTime<Utc>,
+    updated_at: DateTime<Utc>,
+}
+
+#[derive(Debug, Clone)]
+pub struct Contact {
+    id: Uuid,
+    address_book_id: Uuid,
+    uid: String,
+    full_name: Option<String>,
+    first_name: Option<String>,
+    last_name: Option<String>,
+    nickname: Option<String>,
+    email: Vec<Email>,        // Struct with email, type, is_primary
+    phone: Vec<Phone>,        // Struct with number, type, is_primary
+    address: Vec<Address>,    // Struct with street, city, state, postal_code, country, type, is_primary
+    organization: Option<String>,
+    title: Option<String>,
+    notes: Option<String>,
+    photo_url: Option<String>,
+    birthday: Option<NaiveDate>,
+    anniversary: Option<NaiveDate>,
+    vcard: String,            // Full vCard data
+    etag: String,
+    created_at: DateTime<Utc>,
+    updated_at: DateTime<Utc>,
+}
+```
+
+2. **Repositories**:
+
+```rust
+// src/domain/repositories/address_book_repository.rs
+use async_trait::async_trait;
+use uuid::Uuid;
+use crate::domain::entities::address_book::AddressBook;
+use crate::common::errors::Result;
+
+#[async_trait]
+pub trait AddressBookRepository: Send + Sync {
+    async fn create_address_book(&self, address_book: AddressBook) -> Result<AddressBook>;
+    async fn get_address_book_by_id(&self, id: &Uuid) -> Result<AddressBook>;
+    async fn get_address_books_by_owner(&self, owner_id: &str) -> Result<Vec<AddressBook>>;
+    async fn update_address_book(&self, address_book: AddressBook) -> Result<AddressBook>;
+    async fn delete_address_book(&self, id: &Uuid) -> Result<()>;
+}
+
+// src/domain/repositories/contact_repository.rs
+use async_trait::async_trait;
+use uuid::Uuid;
+use crate::domain::entities::contact::Contact;
+use crate::common::errors::Result;
+
+#[async_trait]
+pub trait ContactRepository: Send + Sync {
+    async fn create_contact(&self, contact: Contact) -> Result<Contact>;
+    async fn get_contact_by_id(&self, id: &Uuid) -> Result<Contact>;
+    async fn get_contacts_by_address_book(&self, address_book_id: &Uuid) -> Result<Vec<Contact>>;
+    async fn search_contacts(&self, address_book_id: &Uuid, query: &str) -> Result<Vec<Contact>>;
+    async fn update_contact(&self, contact: Contact) -> Result<Contact>;
+    async fn delete_contact(&self, id: &Uuid) -> Result<()>;
+}
+```
+
+3. **CardDAV Service**:
+
+```rust
+// src/application/services/contact_service.rs
+use std::sync::Arc;
+use crate::application::dtos::contact_dto::*;
+use crate::application::dtos::address_book_dto::*;
+
+pub struct ContactService {
+    // Implements AddressBookUseCase and ContactUseCase
+    // Uses ContactStorageAdapter as infrastructure
+}
+
+impl ContactService {
+    // Implements methods for CardDAV operations...
+}
+```
+
+4. **CardDAV Handler**:
+
+```rust
+// src/interfaces/api/handlers/carddav_handler.rs
+use std::sync::Arc;
+use axum::{
+    Router,
+    routing::{get, put, delete},
+    extract::{Path, State, Request, Extension},
+    http::StatusCode,
+    response::Response,
+};
+use http::{Method, header};
+
+use crate::common::di::AppState;
+use crate::interfaces::middleware::auth::CurrentUser;
+use crate::application::services::carddav_service::CardDavService;
+use crate::common::errors::AppError;
+
+pub fn carddav_routes() -> Router<Arc<AppState>> {
+    Router::new()
+        .route("/carddav/addressbooks/", get(get_address_books))
+        .route("/carddav/addressbooks/:addressbook", get(get_address_book))
+        .route_with_tsr("/carddav/addressbooks/:addressbook", axum::routing::on(
+            Method::PROPFIND, handle_addressbook_propfind,
+            Method::REPORT, handle_addressbook_report,
+            Method::MKCOL, handle_mkaddressbook,
+        ))
+        .route("/carddav/addressbooks/:addressbook/:contact", get(get_contact))
+        .route("/carddav/addressbooks/:addressbook/:contact", put(put_contact))
+        .route("/carddav/addressbooks/:addressbook/:contact", delete(delete_contact))
+}
+
+// Implement functions for each CardDAV method...
+```
+
+## Database Schema
+
+```sql
+-- CalDAV schema
+CREATE SCHEMA IF NOT EXISTS caldav;
+
+CREATE TABLE IF NOT EXISTS caldav.calendars (
+    id UUID PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    owner_id VARCHAR(36) NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
+    description TEXT,
+    color VARCHAR(50),
+    is_public BOOLEAN NOT NULL DEFAULT FALSE,
+    ctag VARCHAR(255),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS caldav.calendar_events (
+    id UUID PRIMARY KEY,
+    calendar_id UUID NOT NULL REFERENCES caldav.calendars(id) ON DELETE CASCADE,
+    summary VARCHAR(255) NOT NULL,
+    description TEXT,
+    location TEXT,
+    start_time TIMESTAMPTZ NOT NULL,
+    end_time TIMESTAMPTZ NOT NULL,
+    all_day BOOLEAN NOT NULL DEFAULT FALSE,
+    rrule TEXT,
+    ical_uid VARCHAR(255) NOT NULL,
+    ical_data TEXT NOT NULL,
+    etag VARCHAR(255),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS caldav.calendar_shares (
+    id SERIAL PRIMARY KEY,
+    calendar_id UUID NOT NULL REFERENCES caldav.calendars(id) ON DELETE CASCADE,
+    user_id VARCHAR(36) NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
+    access_level VARCHAR(20) NOT NULL DEFAULT 'read',
+    UNIQUE(calendar_id, user_id)
+);
+
+CREATE TABLE IF NOT EXISTS caldav.calendar_properties (
+    id SERIAL PRIMARY KEY,
+    calendar_id UUID NOT NULL REFERENCES caldav.calendars(id) ON DELETE CASCADE,
+    property_name VARCHAR(255) NOT NULL,
+    property_value TEXT,
+    UNIQUE(calendar_id, property_name)
+);
+
+-- CardDAV schema
+CREATE SCHEMA IF NOT EXISTS carddav;
+
+CREATE TABLE IF NOT EXISTS carddav.address_books (
+    id UUID PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    owner_id VARCHAR(36) NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
+    description TEXT,
+    color VARCHAR(50),
+    is_public BOOLEAN NOT NULL DEFAULT FALSE,
+    ctag VARCHAR(255),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE(owner_id, name)
+);
+
+CREATE TABLE IF NOT EXISTS carddav.contacts (
+    id UUID PRIMARY KEY,
+    address_book_id UUID NOT NULL REFERENCES carddav.address_books(id) ON DELETE CASCADE,
+    uid VARCHAR(255) NOT NULL,
+    full_name VARCHAR(255),
+    first_name VARCHAR(255),
+    last_name VARCHAR(255),
+    nickname VARCHAR(255),
+    organization VARCHAR(255),
+    title VARCHAR(255),
+    notes TEXT,
+    photo_url TEXT,
+    birthday DATE,
+    anniversary DATE,
+    email JSONB,
+    phone JSONB,
+    address JSONB,
+    vcard TEXT NOT NULL,
+    etag VARCHAR(255) NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE(address_book_id, uid)
+);
+
+CREATE TABLE IF NOT EXISTS carddav.address_book_shares (
+    id SERIAL PRIMARY KEY,
+    address_book_id UUID NOT NULL REFERENCES carddav.address_books(id) ON DELETE CASCADE,
+    user_id VARCHAR(36) NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
+    can_write BOOLEAN NOT NULL DEFAULT FALSE,
+    UNIQUE(address_book_id, user_id)
+);
+
+CREATE TABLE IF NOT EXISTS carddav.contact_groups (
+    id UUID PRIMARY KEY,
+    address_book_id UUID NOT NULL REFERENCES carddav.address_books(id) ON DELETE CASCADE,
+    name VARCHAR(255) NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS carddav.group_memberships (
+    id SERIAL PRIMARY KEY,
+    group_id UUID NOT NULL REFERENCES carddav.contact_groups(id) ON DELETE CASCADE,
+    contact_id UUID NOT NULL REFERENCES carddav.contacts(id) ON DELETE CASCADE,
+    UNIQUE(group_id, contact_id)
+);
+
+-- Indexes for efficient lookup
+CREATE INDEX IF NOT EXISTS idx_calendars_owner ON caldav.calendars(owner_id);
+CREATE INDEX IF NOT EXISTS idx_calendar_events_calendar ON caldav.calendar_events(calendar_id);
+CREATE INDEX IF NOT EXISTS idx_address_books_owner ON carddav.address_books(owner_id);
+CREATE INDEX IF NOT EXISTS idx_contacts_address_book ON carddav.contacts(address_book_id);
+CREATE INDEX IF NOT EXISTS idx_contacts_full_name ON carddav.contacts(full_name);
+```
+
+## Security Considerations
+
+1. **Authentication**
+   - Uses existing authentication
+   - Supports HTTP Basic Authentication for DAV clients
+   - Digest authentication can be added if needed
+
+2. **Authorization**
+   - Verify user permissions before granting resource access
+   - Owner-based and shared-permission access control
+   - Users can only access their own calendars and address books
+
+3. **Attack Prevention**
+   - Validate and sanitize all XML input
+   - Limit maximum payload size
+   - Rate limiting on DAV endpoints
+
+## Testing and Compatibility
+
+### Clients to Test
+
+1. **WebDAV**
+   - Windows Explorer
+   - macOS Finder
+   - Cyberduck
+   - FileZilla (with WebDAV extension)
+
+2. **CalDAV**
+   - Apple Calendar
+   - Mozilla Thunderbird (Lightning)
+   - Microsoft Outlook (with CalDAV add-in)
+   - Google Calendar (via sync)
+
+3. **CardDAV**
+   - Apple Contacts
+   - Mozilla Thunderbird
+   - Microsoft Outlook (with CardDAV add-in)
+   - Google Contacts (via sync)
+
+### Compliance Testing
+
+- Use the **CalDAVTester** suite to verify standards conformance
+- Validate RFC compliance for each protocol
+- Stress tests to evaluate performance under load
+
+### Debugging
+
+- Detailed logging for DAV operations
+- Diagnostic tools for debugging complex DAV requests
+- Clear error messages for troubleshooting