diff --git a/src/compression_engine/gzip.rs b/src/compression_engine/gzip.rs
index d4ff16b..aeb60db 100644
--- a/src/compression_engine/gzip.rs
+++ b/src/compression_engine/gzip.rs
@@ -1,8 +1,18 @@
+```rust
 /// GZip compression engine module.
 ///
 /// This module provides the implementation for GZip compression and decompression
 /// using the `flate2` crate. It includes the main `CompressionEngineGZip` struct
 /// and supporting types for handling GZip streams.
+///
+/// # Usage
+///
+/// ```rust
+/// use keep::compression_engine::get_compression_engine;
+/// let engine = get_compression_engine(keep::compression_engine::CompressionType::GZip)
+///     .expect("GZip engine creation failed");
+/// let reader = engine.open("/path/to/file.gz".into()).expect("Open failed");
+/// ```
 use anyhow::Result;
 use log::*;
 use std::fs::File;
@@ -16,11 +26,20 @@ use flate2::write::GzEncoder;
 
 use crate::compression_engine::CompressionEngine;
 
+```rust
 /// GZip compression engine implementation.
 ///
 /// This struct provides the functionality to compress and decompress data using
 /// the GZip algorithm. It implements the `CompressionEngine` trait for integration
 /// with the compression service.
+///
+/// # Examples
+///
+/// ```rust
+/// let engine = keep::compression_engine::get_compression_engine(keep::compression_engine::CompressionType::GZip)
+///     .expect("Failed to get GZip engine");
+/// assert!(engine.is_supported());
+/// ```
 #[derive(Debug, Eq, PartialEq, Clone, Default)]
 pub struct CompressionEngineGZip {}
 
@@ -30,6 +49,12 @@ impl CompressionEngineGZip {
     /// # Returns
     ///
     /// A new `CompressionEngineGZip` instance.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// let engine = CompressionEngineGZip::new();
+    /// ```
     pub fn new() -> CompressionEngineGZip {
         CompressionEngineGZip {}
     }
@@ -44,6 +69,13 @@ impl CompressionEngine for CompressionEngineGZip {
     /// # Returns
     ///
     /// Always returns `true` since GZip is built-in.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// let engine = CompressionEngineGZip::new();
+    /// assert!(engine.is_supported());
+    /// ```
     fn is_supported(&self) -> bool {
         true
     }
@@ -60,6 +92,16 @@ impl CompressionEngine for CompressionEngineGZip {
     /// # Returns
     ///
     /// * `Result<Box<dyn Read>>` - A boxed reader that decompresses the GZip file on read.
+    ///
+    /// # Errors
+    ///
+    /// * `anyhow::Error` - If the file cannot be opened or decoded.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// let reader = engine.open("/path/to/file.gz".into()).expect("Open failed");
+    /// ```
     fn open(&self, file_path: PathBuf) -> Result<Box<dyn Read>> {
         debug!("COMPRESSION: Opening {:?} using {:?}", file_path, *self);
 
@@ -80,6 +122,16 @@ impl CompressionEngine for CompressionEngineGZip {
     /// # Returns
     ///
     /// * `Result<Box<dyn Write>>` - A boxed writer that compresses data using GZip on write.
+    ///
+    /// # Errors
+    ///
+    /// * `anyhow::Error` - If the file cannot be created or encoder fails.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// let writer = engine.create("/path/to/file.gz".into()).expect("Create failed");
+    /// ```
     fn create(&self, file_path: PathBuf) -> Result<Box<dyn Write>> {
         debug!("COMPRESSION: Writting to {:?} using {:?}", file_path, *self);
 
@@ -90,10 +142,20 @@ impl CompressionEngine for CompressionEngineGZip {
     }
 }
 
+```rust
 /// Auto-finishing GZip encoder that automatically calls finish on drop.
 ///
 /// This wrapper ensures that the GZip stream is properly closed even if the
 /// writer is dropped unexpectedly, preventing incomplete compression files.
+///
+/// # Examples
+///
+/// ```rust
+/// let file = File::create("test.gz").unwrap();
+/// let encoder = GzEncoder::new(file, Compression::default());
+/// let auto_encoder = AutoFinishGzEncoder::new(encoder);
+/// // Encoder will finish on drop
+/// ```
 pub struct AutoFinishGzEncoder<W: Write> {
     encoder: Option<GzEncoder<W>>,
 }
@@ -108,6 +170,14 @@ impl<W: Write> AutoFinishGzEncoder<W> {
     /// # Returns
     ///
     /// A new `AutoFinishGzEncoder` instance.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// let file = File::create("test.gz").unwrap();
+    /// let encoder = GzEncoder::new(file, Compression::default());
+    /// let auto_encoder = AutoFinishGzEncoder::new(encoder);
+    /// ```
     fn new(gz_encoder: GzEncoder<W>) -> AutoFinishGzEncoder<W> {
         AutoFinishGzEncoder {
             encoder: Some(gz_encoder),
@@ -120,6 +190,10 @@ impl<W: Write> Drop for AutoFinishGzEncoder<W> {
     ///
     /// This method ensures the GZip stream is properly closed by calling `finish()`
     /// on the underlying encoder.
+    ///
+    /// # Errors
+    ///
+    /// Errors during finish are logged but ignored.
     fn drop(&mut self) {
         if let Some(encoder) = self.encoder.take() {
             debug!("COMPRESSION: Finishing");
@@ -138,6 +212,10 @@ impl<W: Write> Write for AutoFinishGzEncoder<W> {
     /// # Returns
     ///
     /// * `io::Result<usize>` - The number of bytes written or an I/O error.
+    ///
+    /// # Errors
+    ///
+    /// Propagates errors from the underlying encoder.
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         self.encoder.as_mut().unwrap().write(buf)
     }
@@ -147,6 +225,10 @@ impl<W: Write> Write for AutoFinishGzEncoder<W> {
     /// # Returns
     ///
     /// * `io::Result<()>` - Success or an I/O error.
+    ///
+    /// # Errors
+    ///
+    /// Propagates errors from the underlying encoder.
     fn flush(&mut self) -> io::Result<()> {
         self.encoder.as_mut().unwrap().flush()
     }
diff --git a/src/modes/server/common.rs b/src/modes/server/common.rs
index 7c46b7d..ac89b81 100644
--- a/src/modes/server/common.rs
+++ b/src/modes/server/common.rs
@@ -3,6 +3,14 @@
 /// This module provides shared structures, functions, and middleware used across
 /// different parts of the server implementation, including configuration, state
 /// management, API responses, authentication, and logging.
+///
+/// # Usage
+///
+/// ```rust
+/// use keep::modes::server::common::{ServerConfig, AppState};
+/// let config = ServerConfig { address: "127.0.0.1".to_string(), ..Default::default() };
+/// let state = AppState { /* ... */ };
+/// ```
 use anyhow::Result;
 use axum::{
     extract::{Request, ConnectInfo},
@@ -26,6 +34,17 @@ use crate::services::item_service::ItemService;
 ///
 /// This struct holds the configuration parameters for the HTTP server, including
 /// binding address, port, and authentication settings.
+///
+/// # Examples
+///
+/// ```
+/// let config = ServerConfig {
+///     address: "127.0.0.1".to_string(),
+///     port: Some(8080),
+///     password: None,
+///     password_hash: None,
+/// };
+/// ```
 #[derive(Debug, Clone)]
 pub struct ServerConfig {
     /// Server bind address.
@@ -50,11 +69,6 @@ pub struct ServerConfig {
     pub password_hash: Option<String>,
 }
 
-/// Application state shared across all routes.
-///
-/// This struct encapsulates the shared state that is accessible to all request handlers,
-/// including database connections, file paths, services, and configuration.
-#[derive(Clone)]
 /// Application state shared across all routes.
 ///
 /// This struct encapsulates the shared state that is accessible to all request handlers,
@@ -62,7 +76,10 @@ pub struct ServerConfig {
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
+/// use keep::modes::server::common::AppState;
+/// use std::sync::Arc;
+/// use tokio::sync::Mutex;
 /// let state = AppState {
 ///     db: Arc::new(Mutex::new(conn)),
 ///     data_dir: PathBuf::from("/data"),
@@ -71,6 +88,7 @@ pub struct ServerConfig {
 ///     settings: Arc::new(settings),
 /// };
 /// ```
+#[derive(Clone)]
 pub struct AppState {
     /// Database connection wrapped in Arc<Mutex>.
     ///
@@ -95,11 +113,6 @@ pub struct AppState {
     pub settings: Arc<crate::config::Settings>,
 }
 
-/// Standard API response wrapper containing success status, data payload, and error information.
-///
-/// This generic type is used for all API responses to provide a consistent structure across
-/// different endpoints.
-#[derive(Debug, Serialize, Deserialize, ToSchema)]
 /// Standard API response wrapper containing success status, data payload, and error information.
 ///
 /// This generic type is used for all API responses to provide a consistent structure across
@@ -111,13 +124,15 @@ pub struct AppState {
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
+/// use keep::modes::server::common::ApiResponse;
 /// let response: ApiResponse<Vec<ItemInfo>> = ApiResponse {
 ///     success: true,
 ///     data: Some(items),
 ///     error: None,
 /// };
 /// ```
+#[derive(Debug, Serialize, Deserialize, ToSchema)]
 #[schema(description = "Standard API response wrapper containing success status, data payload, and error information")]
 pub struct ApiResponse<T> {
     /// Success indicator.
@@ -134,23 +149,21 @@ pub struct ApiResponse<T> {
     pub error: Option<String>,
 }
 
-/// Response type for list of item information.
-///
-/// Specialized response for endpoints that return multiple items.
-#[derive(Serialize, Deserialize, ToSchema)]
 /// Response type for list of item information.
 ///
 /// Specialized response for endpoints that return multiple items.
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
+/// use keep::modes::server::common::ItemInfoListResponse;
 /// let response = ItemInfoListResponse {
 ///     success: true,
 ///     data: Some(vec![item_info]),
 ///     error: None,
 /// };
 /// ```
+#[derive(Serialize, Deserialize, ToSchema)]
 pub struct ItemInfoListResponse {
     /// Success indicator.
     ///
@@ -166,23 +179,21 @@ pub struct ItemInfoListResponse {
     pub error: Option<String>,
 }
 
-/// Response type for single item information.
-///
-/// Specialized response for endpoints that return a single item's details.
-#[derive(Serialize, Deserialize, ToSchema)]
 /// Response type for single item information.
 ///
 /// Specialized response for endpoints that return a single item's details.
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
+/// use keep::modes::server::common::ItemInfoResponse;
 /// let response = ItemInfoResponse {
 ///     success: true,
 ///     data: Some(item_info),
 ///     error: None,
 /// };
 /// ```
+#[derive(Serialize, Deserialize, ToSchema)]
 pub struct ItemInfoResponse {
     /// Success indicator.
     ///
@@ -198,23 +209,21 @@ pub struct ItemInfoResponse {
     pub error: Option<String>,
 }
 
-/// Response type for item content information.
-///
-/// Specialized response for endpoints that return item content and related metadata.
-#[derive(Serialize, Deserialize, ToSchema)]
 /// Response type for item content information.
 ///
 /// Specialized response for endpoints that return item content and related metadata.
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
+/// use keep::modes::server::common::ItemContentInfoResponse;
 /// let response = ItemContentInfoResponse {
 ///     success: true,
 ///     data: Some(content_info),
 ///     error: None,
 /// };
 /// ```
+#[derive(Serialize, Deserialize, ToSchema)]
 pub struct ItemContentInfoResponse {
     /// Success indicator.
     ///
@@ -230,23 +239,21 @@ pub struct ItemContentInfoResponse {
     pub error: Option<String>,
 }
 
-/// Response type for metadata.
-///
-/// Specialized response for metadata-only endpoints.
-#[derive(Serialize, Deserialize, ToSchema)]
 /// Response type for metadata.
 ///
 /// Specialized response for metadata-only endpoints.
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
+/// use keep::modes::server::common::MetadataResponse;
 /// let response = MetadataResponse {
 ///     success: true,
 ///     data: Some(meta_map),
 ///     error: None,
 /// };
 /// ```
+#[derive(Serialize, Deserialize, ToSchema)]
 pub struct MetadataResponse {
     /// Success indicator.
     ///
@@ -262,23 +269,21 @@ pub struct MetadataResponse {
     pub error: Option<String>,
 }
 
-/// Response type for status information.
-///
-/// Specialized response for system status endpoints.
-#[derive(Serialize, Deserialize, ToSchema)]
 /// Response type for status information.
 ///
 /// Specialized response for system status endpoints.
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
+/// use keep::modes::server::common::StatusInfoResponse;
 /// let response = StatusInfoResponse {
 ///     success: true,
 ///     data: Some(status_info),
 ///     error: None,
 /// };
 /// ```
+#[derive(Serialize, Deserialize, ToSchema)]
 pub struct StatusInfoResponse {
     /// Success indicator.
     ///
@@ -294,11 +299,6 @@ pub struct StatusInfoResponse {
     pub error: Option<String>,
 }
 
-/// Complete information about a stored item including metadata and tags.
-///
-/// This structure represents the full details of an item, combining basic item
-/// properties with associated tags and metadata.
-#[derive(Serialize, Deserialize, ToSchema)]
 /// Complete information about a stored item including metadata and tags.
 ///
 /// This structure represents the full details of an item, combining basic item
@@ -306,7 +306,9 @@ pub struct StatusInfoResponse {
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
+/// use keep::modes::server::common::ItemInfo;
+/// use std::collections::HashMap;
 /// let item_info = ItemInfo {
 ///     id: 42,
 ///     ts: "2023-12-01T15:30:45Z".to_string(),
@@ -316,6 +318,7 @@ pub struct StatusInfoResponse {
 ///     metadata: HashMap::from([("mime_type".to_string(), "text/plain".to_string())]),
 /// };
 /// ```
+#[derive(Serialize, Deserialize, ToSchema)]
 #[schema(description = "Complete information about a stored item including metadata and tags")]
 pub struct ItemInfo {
     /// Item ID.
@@ -350,17 +353,6 @@ pub struct ItemInfo {
     pub metadata: HashMap<String, String>,
 }
 
-/// Item information including content and metadata, with binary detection.
-///
-/// This structure provides item details along with its content, handling binary
-/// content detection and safe string representation.
-///
-/// # Fields
-///
-/// * `metadata` - Flattened metadata HashMap.
-/// * `content` - Optional string content (text only).
-/// * `binary` - True if binary content.
-#[derive(Serialize, Deserialize, ToSchema)]
 /// Item information including content and metadata, with binary detection.
 ///
 /// This structure provides item details along with its content, handling binary
@@ -368,13 +360,16 @@ pub struct ItemInfo {
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
+/// use keep::modes::server::common::ItemContentInfo;
+/// use std::collections::HashMap;
 /// let content_info = ItemContentInfo {
 ///     metadata: HashMap::from([("mime_type".to_string(), "text/plain".to_string())]),
 ///     content: Some("Hello, world!".to_string()),
 ///     binary: false,
 /// };
 /// ```
+#[derive(Serialize, Deserialize, ToSchema)]
 #[schema(description = "Item information including content and metadata, with binary detection")]
 pub struct ItemContentInfo {
     /// Metadata hashmap.
@@ -395,23 +390,17 @@ pub struct ItemContentInfo {
     pub binary: bool,
 }
 
-/// Query parameters for tags.
-///
-/// Structure for handling tag-based query parameters in API requests.
-///
-/// # Fields
-///
-/// * `tags` - Optional comma-separated tags for filtering.
-#[derive(Debug, Deserialize)]
 /// Query parameters for tags.
 ///
 /// Structure for handling tag-based query parameters in API requests.
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
+/// use keep::modes::server::common::TagsQuery;
 /// let query = TagsQuery { tags: Some("tag1,tag2".to_string()) };
 /// ```
+#[derive(Debug, Deserialize)]
 pub struct TagsQuery {
     /// Optional comma-separated tags.
     ///
@@ -419,24 +408,14 @@ pub struct TagsQuery {
     pub tags: Option<String>,
 }
 
-/// Query parameters for listing items.
-///
-/// Structure for pagination and sorting parameters in item listing endpoints.
-///
-/// # Fields
-///
-/// * `tags` - Optional tags for filtering.
-/// * `order` - Optional sort: "newest" or "oldest".
-/// * `start` - Optional start index.
-/// * `count` - Optional item limit.
-#[derive(Debug, Deserialize)]
 /// Query parameters for listing items.
 ///
 /// Structure for pagination and sorting parameters in item listing endpoints.
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
+/// use keep::modes::server::common::ListItemsQuery;
 /// let query = ListItemsQuery {
 ///     tags: Some("important".to_string()),
 ///     order: Some("newest".to_string()),
@@ -444,6 +423,7 @@ pub struct TagsQuery {
 ///     count: Some(10),
 /// };
 /// ```
+#[derive(Debug, Deserialize)]
 pub struct ListItemsQuery {
     /// Optional comma-separated tags for filtering.
     ///
@@ -463,25 +443,14 @@ pub struct ListItemsQuery {
     pub count: Option<u32>,
 }
 
-/// Query parameters for item retrieval.
-///
-/// Structure for content retrieval parameters, including binary handling and streaming options.
-///
-/// # Fields
-///
-/// * `allow_binary` - Allow binary (default true).
-/// * `offset` - Byte offset (default 0).
-/// * `length` - Byte length (default 0 = all).
-/// * `stream` - Enable streaming (default false).
-/// * `as_meta` - Return as JSON metadata (default false).
-#[derive(Debug, Deserialize, utoipa::ToSchema)]
 /// Query parameters for item retrieval.
 ///
 /// Structure for content retrieval parameters, including binary handling and streaming options.
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
+/// use keep::modes::server::common::ItemQuery;
 /// let query = ItemQuery {
 ///     allow_binary: true,
 ///     offset: 0,
@@ -490,6 +459,7 @@ pub struct ListItemsQuery {
 ///     as_meta: false,
 /// };
 /// ```
+#[derive(Debug, Deserialize, utoipa::ToSchema)]
 pub struct ItemQuery {
     /// Allow binary content (default: true).
     ///
@@ -518,26 +488,14 @@ pub struct ItemQuery {
     pub as_meta: bool,
 }
 
-/// Query parameters for item content retrieval.
-///
-/// Extended query parameters for content-specific operations, including tag filtering.
-///
-/// # Fields
-///
-/// * `tags` - Optional tags for filtering.
-/// * `allow_binary` - Allow binary (default true).
-/// * `offset` - Byte offset (default 0).
-/// * `length` - Byte length (default 0 = all).
-/// * `stream` - Enable streaming (default false).
-/// * `as_meta` - Return as JSON metadata (default false).
-#[derive(Debug, Deserialize, utoipa::ToSchema)]
 /// Query parameters for item content retrieval.
 ///
 /// Extended query parameters for content-specific operations, including tag filtering.
 ///
 /// # Examples
 ///
-/// ```
+/// ```rust
+/// use keep::modes::server::common::ItemContentQuery;
 /// let query = ItemContentQuery {
 ///     tags: Some("important".to_string()),
 ///     allow_binary: true,
@@ -547,6 +505,7 @@ pub struct ItemQuery {
 ///     as_meta: false,
 /// };
 /// ```
+#[derive(Debug, Deserialize, utoipa::ToSchema)]
 pub struct ItemContentQuery {
     /// Optional comma-separated tags for filtering.
     ///