Update README.MD

.github/workflows/main.yml

@@ -57,10 +57,6 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@stable
       
-      - uses: mbrobbel/rustfmt-check@master
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          
       - name: Install rust targets
         run: rustup target add ${{ matrix.build_target }}
         
@@ -71,11 +67,11 @@ jobs:
           args: cargo build --target ${{ matrix.build_target }} --release
           
       - name: Build MacOS
-        if: matrix.os != 'macos-latest'
+        if: matrix.os == 'macos-latest'
         run: cargo build --target ${{ matrix.build_target }} --release
           
       - name: Build Windows
-        if: matrix.os != 'ubuntu-latest'
+        if: matrix.os == 'windows-latest'
         run: cargo build --target ${{ matrix.build_target }} --release
           
       - name: Upload artifact

.gitignore

@@ -1 +1,3 @@
 /target
+*.swp
+*.swo

Cargo.lock

@@ -836,6 +836,17 @@ dependencies = [
  "digest",
 ]
 
+[[package]]
+name = "hostname"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c731c3e10504cc8ed35cfe2f1db4c9274c3d35fa486e3b31df46f068ef3e867"
+dependencies = [
+ "libc",
+ "match_cfg",
+ "winapi",
+]
+
 [[package]]
 name = "http"
 version = "0.2.12"
@@ -1053,13 +1064,14 @@ dependencies = [
 
 [[package]]
 name = "khm"
-version = "0.2.2"
+version = "0.4.1"
 dependencies = [
  "actix-web",
  "base64 0.21.7",
  "chrono",
  "clap",
  "env_logger",
+ "hostname",
  "log",
  "regex",
  "reqwest",
@@ -1120,6 +1132,12 @@ version = "0.4.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
 
+[[package]]
+name = "match_cfg"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffbee8634e0d45d258acb448e7eaab3fce7a0a467395d4d9f228e3c1f01fb2e4"
+
 [[package]]
 name = "md-5"
 version = "0.10.6"
@@ -2223,6 +2241,28 @@ dependencies = [
  "web-sys",
 ]
 
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "windows-core"
 version = "0.52.0"

Cargo.toml

@@ -1,8 +1,8 @@
 [package]
 name = "khm"
-version = "0.3.0"
+version = "0.4.2"
 edition = "2021"
-authors = ["AB <ab@hexor.cy>", "ChatGPT-4o"]
+authors = ["AB <ab@hexor.cy>"]
 
 [dependencies]
 actix-web = "4"
@@ -17,3 +17,4 @@ tokio-postgres = { version = "0.7", features = ["with-chrono-0_4"] }
 clap = { version = "4", features = ["derive"] }
 chrono = "0.4.38"
 reqwest = { version = "0.12", features = ["json"] }
+hostname = "0.3"

README.MD

@@ -38,6 +38,7 @@ Options:
 - `--db-name <DB_NAME>` Server mode: Name of the PostgreSQL database [default: khm]
 - `--db-user <DB_USER>` Server mode: Username for the PostgreSQL database
 - `--db-password <DB_PASSWORD>` Server mode: Password for the PostgreSQL database
+- `--basic-auth <BASIC_AUTH>` Client mode: Basic Auth credentials [default: ""]
 - `--host <HOST>` Client mode: Full host address of the server to connect to. Like `https://khm.example.com/<FLOW_NAME>`
 - `--known-hosts <KNOWN_HOSTS>` Client mode: Path to the known_hosts file [default: ~/.ssh/known_hosts]
 

src/client.rs

@@ -50,6 +50,14 @@ fn write_known_hosts(file_path: &str, keys: &[SshKey]) -> io::Result<()> {
     Ok(())
 }
 
+// Get local hostname for request headers
+fn get_hostname() -> String {
+    match hostname::get() {
+        Ok(name) => name.to_string_lossy().to_string(),
+        Err(_) => "unknown-host".to_string(),
+    }
+}
+
 async fn send_keys_to_server(
     host: &str,
     keys: Vec<SshKey>,
@@ -61,6 +69,17 @@ async fn send_keys_to_server(
 
     let mut headers = HeaderMap::new();
 
+    // Add hostname header
+    let hostname = get_hostname();
+    headers.insert(
+        "X-Client-Hostname",
+        HeaderValue::from_str(&hostname).unwrap_or_else(|_| {
+            error!("Failed to create hostname header value");
+            HeaderValue::from_static("unknown-host")
+        }),
+    );
+    info!("Adding hostname header: {}", hostname);
+
     if !auth_string.is_empty() {
         let parts: Vec<&str> = auth_string.splitn(2, ':').collect();
         if parts.len() == 2 {
@@ -105,6 +124,17 @@ async fn get_keys_from_server(
 
     let mut headers = HeaderMap::new();
 
+    // Add hostname header
+    let hostname = get_hostname();
+    headers.insert(
+        "X-Client-Hostname",
+        HeaderValue::from_str(&hostname).unwrap_or_else(|_| {
+            error!("Failed to create hostname header value");
+            HeaderValue::from_static("unknown-host")
+        }),
+    );
+    info!("Adding hostname header: {}", hostname);
+
     if !auth_string.is_empty() {
         let parts: Vec<&str> = auth_string.splitn(2, ':').collect();
         if parts.len() == 2 {

src/db.rs

@@ -0,0 +1,295 @@
+use crate::server::SshKey;
+use log::info;
+use std::collections::HashMap;
+use std::collections::HashSet;
+use tokio_postgres::Client;
+
+// Structure for storing key processing statistics
+pub struct KeyInsertStats {
+    pub total: usize,                   // Total number of received keys
+    pub inserted: usize,                // Number of new keys
+    pub unchanged: usize,               // Number of unchanged keys
+    pub key_id_map: Vec<(SshKey, i32)>, // Mapping of keys to their IDs in the database
+}
+
+pub async fn initialize_db_schema(client: &Client) -> Result<(), tokio_postgres::Error> {
+    info!("Checking and initializing database schema if needed");
+
+    // Check if tables exist by querying information_schema
+    let tables_exist = client
+        .query(
+            "SELECT EXISTS (
+                SELECT FROM information_schema.tables 
+                WHERE table_schema = 'public' 
+                AND table_name = 'keys'
+            ) AND EXISTS (
+                SELECT FROM information_schema.tables 
+                WHERE table_schema = 'public' 
+                AND table_name = 'flows'
+            )",
+            &[],
+        )
+        .await?
+        .get(0)
+        .map(|row| row.get::<_, bool>(0))
+        .unwrap_or(false);
+
+    if !tables_exist {
+        info!("Database schema doesn't exist. Creating tables...");
+
+        // Create the keys table
+        client
+            .execute(
+                "CREATE TABLE IF NOT EXISTS public.keys (
+                    key_id SERIAL PRIMARY KEY,
+                    host VARCHAR(255) NOT NULL,
+                    key TEXT NOT NULL,
+                    updated TIMESTAMP WITH TIME ZONE NOT NULL,
+                    CONSTRAINT unique_host_key UNIQUE (host, key)
+                )",
+                &[],
+            )
+            .await?;
+
+        // Create the flows table
+        client
+            .execute(
+                "CREATE TABLE IF NOT EXISTS public.flows (
+                    flow_id SERIAL PRIMARY KEY,
+                    name VARCHAR(255) NOT NULL,
+                    key_id INTEGER NOT NULL,
+                    CONSTRAINT fk_key
+                        FOREIGN KEY(key_id)
+                        REFERENCES public.keys(key_id)
+                        ON DELETE CASCADE,
+                    CONSTRAINT unique_flow_key UNIQUE (name, key_id)
+                )",
+                &[],
+            )
+            .await?;
+
+        // Create an index for faster lookups
+        client
+            .execute(
+                "CREATE INDEX IF NOT EXISTS idx_flows_name ON public.flows(name)",
+                &[],
+            )
+            .await?;
+
+        info!("Database schema created successfully");
+    } else {
+        info!("Database schema already exists");
+    }
+
+    Ok(())
+}
+
+pub async fn batch_insert_keys(
+    client: &Client,
+    keys: &[SshKey],
+) -> Result<KeyInsertStats, tokio_postgres::Error> {
+    if keys.is_empty() {
+        return Ok(KeyInsertStats {
+            total: 0,
+            inserted: 0,
+            unchanged: 0,
+            key_id_map: Vec::new(),
+        });
+    }
+
+    // Prepare arrays for batch insertion
+    let mut host_values: Vec<&str> = Vec::with_capacity(keys.len());
+    let mut key_values: Vec<&str> = Vec::with_capacity(keys.len());
+
+    for key in keys {
+        host_values.push(&key.server);
+        key_values.push(&key.public_key);
+    }
+
+    // First, check which keys already exist in the database
+    let mut existing_keys = HashMap::new();
+    let mut key_query = String::from("SELECT host, key, key_id FROM public.keys WHERE ");
+
+    for i in 0..keys.len() {
+        if i > 0 {
+            key_query.push_str(" OR ");
+        }
+        key_query.push_str(&format!("(host = ${} AND key = ${})", i * 2 + 1, i * 2 + 2));
+    }
+
+    let mut params: Vec<&(dyn tokio_postgres::types::ToSql + Sync)> =
+        Vec::with_capacity(keys.len() * 2);
+    for i in 0..keys.len() {
+        params.push(&host_values[i]);
+        params.push(&key_values[i]);
+    }
+
+    let rows = client.query(&key_query, &params[..]).await?;
+
+    for row in rows {
+        let host: String = row.get(0);
+        let key: String = row.get(1);
+        let key_id: i32 = row.get(2);
+        existing_keys.insert((host, key), key_id);
+    }
+
+    // Determine which keys need to be inserted and which already exist
+    let mut keys_to_insert = Vec::new();
+    let mut unchanged_keys = Vec::new();
+
+    for key in keys {
+        let key_tuple = (key.server.clone(), key.public_key.clone());
+        if existing_keys.contains_key(&key_tuple) {
+            unchanged_keys.push((key.clone(), *existing_keys.get(&key_tuple).unwrap()));
+        } else {
+            keys_to_insert.push(key.clone());
+        }
+    }
+
+    let mut inserted_keys = Vec::new();
+
+    // If there are keys to insert, perform the insertion
+    if !keys_to_insert.is_empty() {
+        let mut insert_sql = String::from("INSERT INTO public.keys (host, key, updated) VALUES ");
+
+        let mut insert_params: Vec<&(dyn tokio_postgres::types::ToSql + Sync)> = Vec::new();
+        let mut param_count = 1;
+
+        for (i, key) in keys_to_insert.iter().enumerate() {
+            if i > 0 {
+                insert_sql.push_str(", ");
+            }
+            insert_sql.push_str(&format!("(${}, ${}, NOW())", param_count, param_count + 1));
+            insert_params.push(&key.server);
+            insert_params.push(&key.public_key);
+            param_count += 2;
+        }
+
+        insert_sql.push_str(" RETURNING key_id, host, key");
+
+        let inserted_rows = client.query(&insert_sql, &insert_params[..]).await?;
+
+        for row in inserted_rows {
+            let host: String = row.get(1);
+            let key_text: String = row.get(2);
+            let key_id: i32 = row.get(0);
+
+            if let Some(orig_key) = keys_to_insert
+                .iter()
+                .find(|k| k.server == host && k.public_key == key_text)
+            {
+                inserted_keys.push((orig_key.clone(), key_id));
+            }
+        }
+    }
+
+    // Save the number of elements before combining
+    let inserted_count = inserted_keys.len();
+    let unchanged_count = unchanged_keys.len();
+
+    // Combine results and generate statistics
+    let mut key_id_map = Vec::with_capacity(unchanged_count + inserted_count);
+    key_id_map.extend(unchanged_keys);
+    key_id_map.extend(inserted_keys);
+
+    let stats = KeyInsertStats {
+        total: keys.len(),
+        inserted: inserted_count,
+        unchanged: unchanged_count,
+        key_id_map,
+    };
+
+    info!(
+        "Keys stats: received={}, new={}, unchanged={}",
+        stats.total, stats.inserted, stats.unchanged
+    );
+
+    Ok(stats)
+}
+
+pub async fn batch_insert_flow_keys(
+    client: &Client,
+    flow_name: &str,
+    key_ids: &[i32],
+) -> Result<usize, tokio_postgres::Error> {
+    if key_ids.is_empty() {
+        info!("No keys to associate with flow '{}'", flow_name);
+        return Ok(0);
+    }
+
+    // First, check which associations already exist
+    let mut existing_query =
+        String::from("SELECT key_id FROM public.flows WHERE name = $1 AND key_id IN (");
+
+    for i in 0..key_ids.len() {
+        if i > 0 {
+            existing_query.push_str(", ");
+        }
+        existing_query.push_str(&format!("${}", i + 2));
+    }
+    existing_query.push_str(")");
+
+    let mut params: Vec<&(dyn tokio_postgres::types::ToSql + Sync)> =
+        Vec::with_capacity(key_ids.len() + 1);
+    params.push(&flow_name);
+    for key_id in key_ids {
+        params.push(key_id);
+    }
+
+    let rows = client.query(&existing_query, &params[..]).await?;
+
+    let mut existing_associations = HashSet::new();
+    for row in rows {
+        let key_id: i32 = row.get(0);
+        existing_associations.insert(key_id);
+    }
+
+    // Filter only keys that are not yet associated with the flow
+    let new_key_ids: Vec<&i32> = key_ids
+        .iter()
+        .filter(|&id| !existing_associations.contains(id))
+        .collect();
+
+    if new_key_ids.is_empty() {
+        info!(
+            "All {} keys are already associated with flow '{}'",
+            key_ids.len(),
+            flow_name
+        );
+        return Ok(0);
+    }
+
+    // Build SQL query with multiple values only for new associations
+    let mut sql = String::from("INSERT INTO public.flows (name, key_id) VALUES ");
+
+    for i in 0..new_key_ids.len() {
+        if i > 0 {
+            sql.push_str(", ");
+        }
+        sql.push_str(&format!("($1, ${})", i + 2));
+    }
+
+    sql.push_str(" ON CONFLICT (name, key_id) DO NOTHING");
+
+    // Prepare parameters for the query
+    let mut insert_params: Vec<&(dyn tokio_postgres::types::ToSql + Sync)> =
+        Vec::with_capacity(new_key_ids.len() + 1);
+    insert_params.push(&flow_name);
+    for key_id in &new_key_ids {
+        insert_params.push(*key_id);
+    }
+
+    // Execute query
+    let affected = client.execute(&sql, &insert_params[..]).await?;
+
+    let affected_usize = affected as usize;
+
+    info!(
+        "Added {} new key-flow associations for flow '{}' (skipped {} existing)",
+        affected_usize,
+        flow_name,
+        existing_associations.len()
+    );
+
+    Ok(affected_usize)
+}

src/main.rs

@@ -1,4 +1,5 @@
 mod client;
+mod db;
 mod server;
 
 use clap::Parser;

src/server.rs

@@ -1,4 +1,4 @@
-use actix_web::{web, App, HttpResponse, HttpServer, Responder};
+use actix_web::{web, App, HttpRequest, HttpResponse, HttpServer, Responder};
 use log::{error, info};
 use regex::Regex;
 use serde::{Deserialize, Serialize};
@@ -6,6 +6,8 @@ use std::collections::HashMap;
 use std::sync::{Arc, Mutex};
 use tokio_postgres::{Client, NoTls};
 
+use crate::db;
+
 #[derive(Serialize, Deserialize, Clone, Debug)]
 pub struct SshKey {
     pub server: String,
@@ -33,51 +35,6 @@ pub fn is_valid_ssh_key(key: &str) -> bool {
         || ed25519_re.is_match(key)
 }
 
-pub async fn insert_key_if_not_exists(
-    client: &Client,
-    key: &SshKey,
-) -> Result<i32, tokio_postgres::Error> {
-    let row = client
-        .query_opt(
-            "SELECT key_id FROM public.keys WHERE host = $1 AND key = $2",
-            &[&key.server, &key.public_key],
-        )
-        .await?;
-
-    if let Some(row) = row {
-        client
-            .execute(
-                "UPDATE public.keys SET updated = NOW() WHERE key_id = $1",
-                &[&row.get::<_, i32>(0)],
-            )
-            .await?;
-        info!("Updated existing key for server: {}", key.server);
-        Ok(row.get(0))
-    } else {
-        let row = client.query_one(
-            "INSERT INTO public.keys (host, key, updated) VALUES ($1, $2, NOW()) RETURNING key_id",
-            &[&key.server, &key.public_key]
-        ).await?;
-        info!("Inserted new key for server: {}", key.server);
-        Ok(row.get(0))
-    }
-}
-
-pub async fn insert_flow_key(
-    client: &Client,
-    flow_name: &str,
-    key_id: i32,
-) -> Result<(), tokio_postgres::Error> {
-    client
-        .execute(
-            "INSERT INTO public.flows (name, key_id) VALUES ($1, $2) ON CONFLICT DO NOTHING",
-            &[&flow_name, &key_id],
-        )
-        .await?;
-    info!("Inserted key_id {} into flow: {}", key_id, flow_name);
-    Ok(())
-}
-
 pub async fn get_keys_from_db(client: &Client) -> Result<Vec<Flow>, tokio_postgres::Error> {
     let rows = client.query(
         "SELECT k.host, k.key, f.name FROM public.keys k INNER JOIN public.flows f ON k.key_id = f.key_id",
@@ -113,24 +70,53 @@ pub async fn get_keys_from_db(client: &Client) -> Result<Vec<Flow>, tokio_postgr
     Ok(flows_map.into_values().collect())
 }
 
+// Extract client hostname from request headers
+fn get_client_hostname(req: &HttpRequest) -> String {
+    if let Some(hostname) = req.headers().get("X-Client-Hostname") {
+        if let Ok(hostname_str) = hostname.to_str() {
+            return hostname_str.to_string();
+        }
+    }
+    "unknown-client".to_string()
+}
+
 pub async fn get_keys(
     flows: web::Data<Flows>,
     flow_id: web::Path<String>,
     allowed_flows: web::Data<Vec<String>>,
+    req: HttpRequest,
 ) -> impl Responder {
+    let client_hostname = get_client_hostname(&req);
     let flow_id_str = flow_id.into_inner();
+
+    info!(
+        "Received keys request from client '{}' for flow '{}'",
+        client_hostname, flow_id_str
+    );
+
     if !allowed_flows.contains(&flow_id_str) {
-        error!("Flow ID not allowed: {}", flow_id_str);
+        error!(
+            "Flow ID not allowed for client '{}': {}",
+            client_hostname, flow_id_str
+        );
         return HttpResponse::Forbidden().body("Flow ID not allowed");
     }
 
     let flows = flows.lock().unwrap();
     if let Some(flow) = flows.iter().find(|flow| flow.name == flow_id_str) {
         let servers: Vec<&SshKey> = flow.servers.iter().collect();
-        info!("Returning {} keys for flow: {}", servers.len(), flow_id_str);
+        info!(
+            "Returning {} keys for flow '{}' to client '{}'",
+            servers.len(),
+            flow_id_str,
+            client_hostname
+        );
         HttpResponse::Ok().json(servers)
     } else {
-        error!("Flow ID not found: {}", flow_id_str);
+        error!(
+            "Flow ID not found for client '{}': {}",
+            client_hostname, flow_id_str
+        );
         HttpResponse::NotFound().body("Flow ID not found")
     }
 }
@@ -141,42 +127,99 @@ pub async fn add_keys(
     new_keys: web::Json<Vec<SshKey>>,
     db_client: web::Data<Arc<Client>>,
     allowed_flows: web::Data<Vec<String>>,
+    req: HttpRequest,
 ) -> impl Responder {
+    let client_hostname = get_client_hostname(&req);
     let flow_id_str = flow_id.into_inner();
+
+    info!(
+        "Received {} keys from client '{}' for flow '{}'",
+        new_keys.len(),
+        client_hostname,
+        flow_id_str
+    );
+
     if !allowed_flows.contains(&flow_id_str) {
-        error!("Flow ID not allowed: {}", flow_id_str);
+        error!(
+            "Flow ID not allowed for client '{}': {}",
+            client_hostname, flow_id_str
+        );
         return HttpResponse::Forbidden().body("Flow ID not allowed");
     }
 
+    // Check SSH key format
+    let mut valid_keys = Vec::new();
     for new_key in new_keys.iter() {
         if !is_valid_ssh_key(&new_key.public_key) {
-            error!("Invalid SSH key format for server: {}", new_key.server);
+            error!(
+                "Invalid SSH key format from client '{}' for server: {}",
+                client_hostname, new_key.server
+            );
             return HttpResponse::BadRequest().body(format!(
                 "Invalid SSH key format for server: {}",
                 new_key.server
             ));
         }
+        valid_keys.push(new_key.clone());
+    }
 
-        match insert_key_if_not_exists(&db_client, new_key).await {
-            Ok(key_id) => {
-                if let Err(e) = insert_flow_key(&db_client, &flow_id_str, key_id).await {
-                    error!("Failed to insert flow key into database: {}", e);
-                    return HttpResponse::InternalServerError()
-                        .body("Failed to insert flow key into database");
-                }
-            }
+    info!(
+        "Processing batch of {} keys from client '{}' for flow: {}",
+        valid_keys.len(),
+        client_hostname,
+        flow_id_str
+    );
+
+    // Batch insert keys with statistics
+    let key_stats = match crate::db::batch_insert_keys(&db_client, &valid_keys).await {
+        Ok(stats) => stats,
         Err(e) => {
-                error!("Failed to insert key into database: {}", e);
+            error!(
+                "Failed to batch insert keys from client '{}' into database: {}",
+                client_hostname, e
+            );
             return HttpResponse::InternalServerError()
-                    .body("Failed to insert key into database");
-            }
+                .body("Failed to batch insert keys into database");
         }
+    };
+
+    // Always try to associate all keys with the flow, regardless of whether they're new or existing
+    if !key_stats.key_id_map.is_empty() {
+        // Extract all key IDs from statistics, both new and existing
+        let key_ids: Vec<i32> = key_stats.key_id_map.iter().map(|(_, id)| *id).collect();
+
+        // Batch insert key-flow associations
+        if let Err(e) = crate::db::batch_insert_flow_keys(&db_client, &flow_id_str, &key_ids).await
+        {
+            error!(
+                "Failed to batch insert flow keys from client '{}' into database: {}",
+                client_hostname, e
+            );
+            return HttpResponse::InternalServerError()
+                .body("Failed to batch insert flow keys into database");
         }
 
+        info!(
+            "Added flow associations for {} keys from client '{}' in flow '{}'",
+            key_ids.len(),
+            client_hostname,
+            flow_id_str
+        );
+    } else {
+        info!(
+            "No keys to associate from client '{}' with flow '{}'",
+            client_hostname, flow_id_str
+        );
+    }
+
+    // Get updated data
     let updated_flows = match get_keys_from_db(&db_client).await {
         Ok(flows) => flows,
         Err(e) => {
-            error!("Failed to get updated flows from database: {}", e);
+            error!(
+                "Failed to get updated flows from database after client '{}' request: {}",
+                client_hostname, e
+            );
             return HttpResponse::InternalServerError()
                 .body("Failed to refresh flows from database");
         }
@@ -188,10 +231,28 @@ pub async fn add_keys(
     let updated_flow = flows_guard.iter().find(|flow| flow.name == flow_id_str);
     if let Some(flow) = updated_flow {
         let servers: Vec<&SshKey> = flow.servers.iter().collect();
-        info!("Updated flow: {} with {} keys", flow_id_str, servers.len());
-        HttpResponse::Ok().json(servers)
+        info!(
+            "Keys summary for client '{}', flow '{}': total received={}, new={}, unchanged={}, total in flow={}",
+            client_hostname,
+            flow_id_str,
+            key_stats.total,
+            key_stats.inserted,
+            key_stats.unchanged,
+            servers.len()
+        );
+
+        // Add statistics to HTTP response headers
+        let mut response = HttpResponse::Ok();
+        response.append_header(("X-Keys-Total", key_stats.total.to_string()));
+        response.append_header(("X-Keys-New", key_stats.inserted.to_string()));
+        response.append_header(("X-Keys-Unchanged", key_stats.unchanged.to_string()));
+
+        response.json(servers)
     } else {
-        error!("Flow ID not found after update: {}", flow_id_str);
+        error!(
+            "Flow ID not found after update from client '{}': {}",
+            client_hostname, flow_id_str
+        );
         HttpResponse::NotFound().body("Flow ID not found")
     }
 }
@@ -207,7 +268,17 @@ pub async fn run_server(args: crate::Args) -> std::io::Result<()> {
         args.db_host, db_user, db_password, args.db_name
     );
 
-    let (db_client, connection) = tokio_postgres::connect(&db_conn_str, NoTls).await.unwrap();
+    info!("Connecting to database at {}", args.db_host);
+    let (db_client, connection) = match tokio_postgres::connect(&db_conn_str, NoTls).await {
+        Ok((client, conn)) => (client, conn),
+        Err(e) => {
+            error!("Failed to connect to the database: {}", e);
+            return Err(std::io::Error::new(
+                std::io::ErrorKind::ConnectionRefused,
+                format!("Database connection error: {}", e),
+            ));
+        }
+    };
     let db_client = Arc::new(db_client);
 
     // Spawn a new thread to run the database connection
@@ -217,6 +288,15 @@ pub async fn run_server(args: crate::Args) -> std::io::Result<()> {
         }
     });
 
+    // Initialize database schema if needed
+    if let Err(e) = db::initialize_db_schema(&db_client).await {
+        error!("Failed to initialize database schema: {}", e);
+        return Err(std::io::Error::new(
+            std::io::ErrorKind::Other,
+            format!("Database schema initialization error: {}", e),
+        ));
+    }
+
     let mut initial_flows = match get_keys_from_db(&db_client).await {
         Ok(flows) => flows,
         Err(e) => {