feat(async): create dedicated pools + runtime isolation for OCR

frontend/src/pages/SourcesPage.tsx

@@ -61,7 +61,7 @@ import {
   Folder as FolderIcon,
   Assessment as AssessmentIcon,
   Extension as ExtensionIcon,
-  Server as ServerIcon,
+  Storage as ServerIcon,
 } from '@mui/icons-material';
 import { useNavigate } from 'react-router-dom';
 import api from '../services/api';

src/db.rs

@@ -24,6 +24,18 @@ impl Database {
             .await?;
         Ok(Self { pool })
     }
+
+    pub async fn new_with_pool_config(database_url: &str, max_connections: u32, min_connections: u32) -> Result<Self> {
+        let pool = PgPoolOptions::new()
+            .max_connections(max_connections)
+            .acquire_timeout(Duration::from_secs(10))
+            .idle_timeout(Duration::from_secs(600))
+            .max_lifetime(Duration::from_secs(1800))
+            .min_connections(min_connections)
+            .connect(database_url)
+            .await?;
+        Ok(Self { pool })
+    }
     
     pub fn get_pool(&self) -> &PgPool {
         &self.pool

src/main.rs

@@ -20,7 +20,9 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     tracing_subscriber::fmt::init();
     
     let config = Config::from_env()?;
-    let db = Database::new(&config.database_url).await?;
+    // Create separate database pools for different workloads
+    let web_db = Database::new_with_pool_config(&config.database_url, 20, 2).await?;  // Web UI pool
+    let background_db = Database::new_with_pool_config(&config.database_url, 30, 3).await?;  // Background operations pool
     
     // Don't run the old migration system - let SQLx handle everything
     // db.migrate().await?;
@@ -110,14 +112,14 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         }
     }
     
-    // Seed admin user
-    seed::seed_admin_user(&db).await?;
+    // Seed admin user  
+    seed::seed_admin_user(&background_db).await?;
     
     // Seed system user for watcher
-    seed::seed_system_user(&db).await?;
+    seed::seed_system_user(&background_db).await?;
     
-    // Reset any running WebDAV syncs from previous server instance
-    match db.reset_running_webdav_syncs().await {
+    // Reset any running WebDAV syncs from previous server instance using background DB
+    match background_db.reset_running_webdav_syncs().await {
         Ok(count) => {
             if count > 0 {
                 info!("Reset {} orphaned WebDAV sync states from server restart", count);
@@ -128,15 +130,24 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         }
     }
     
-    let state = AppState { 
-        db, 
+    // Create web-facing state with dedicated web DB pool
+    let web_state = AppState { 
+        db: web_db, 
         config: config.clone(),
         webdav_scheduler: None, // Will be set after creating scheduler
     };
-    let state = Arc::new(state);
+    let web_state = Arc::new(web_state);
+    
+    // Create background state with dedicated background DB pool  
+    let background_state = AppState {
+        db: background_db,
+        config: config.clone(),
+        webdav_scheduler: None,
+    };
+    let background_state = Arc::new(background_state);
     
     let watcher_config = config.clone();
-    let watcher_db = state.db.clone();
+    let watcher_db = background_state.db.clone();
     tokio::spawn(async move {
         if let Err(e) = readur::watcher::start_folder_watcher(watcher_config, watcher_db).await {
             error!("Folder watcher error: {}", e);
@@ -156,12 +167,19 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         .thread_name("readur-background")
         .enable_all()
         .build()?;
+        
+    // Create dedicated runtime for database-heavy operations
+    let db_runtime = tokio::runtime::Builder::new_multi_thread()
+        .worker_threads(2)  // Dedicated threads for intensive DB operations
+        .thread_name("readur-db")
+        .enable_all()
+        .build()?;
     
-    // Start OCR queue worker on dedicated OCR runtime
+    // Start OCR queue worker on dedicated OCR runtime using background DB pool
     let concurrent_jobs = 4; // TODO: Get from config/settings  
     let queue_service = Arc::new(readur::ocr_queue::OcrQueueService::new(
-        state.db.clone(), 
-        state.db.get_pool().clone(), 
+        background_state.db.clone(), 
+        background_state.db.get_pool().clone(), 
         concurrent_jobs
     ));
     
@@ -191,16 +209,16 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         }
     });
     
-    // Create WebDAV scheduler and update AppState
-    let webdav_scheduler = Arc::new(readur::webdav_scheduler::WebDAVScheduler::new(state.clone()));
+    // Create WebDAV scheduler with background state
+    let webdav_scheduler = Arc::new(readur::webdav_scheduler::WebDAVScheduler::new(background_state.clone()));
     
-    // Update the state to include the scheduler
-    let updated_state = AppState {
-        db: state.db.clone(),
-        config: state.config.clone(),
+    // Update the web state to include the scheduler reference
+    let updated_web_state = AppState {
+        db: web_state.db.clone(),
+        config: web_state.config.clone(),
         webdav_scheduler: Some(webdav_scheduler.clone()),
     };
-    let state = Arc::new(updated_state);
+    let web_state = Arc::new(updated_web_state);
     
     // Start WebDAV background sync scheduler on background runtime
     let scheduler_for_background = webdav_scheduler.clone();
@@ -229,7 +247,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         .merge(readur::swagger::create_swagger_router())
         .fallback_service(ServeDir::new("frontend/dist").fallback(ServeFile::new("frontend/dist/index.html")))
         .layer(CorsLayer::permissive())
-        .with_state(state.clone());
+        .with_state(web_state.clone());
     
     let listener = tokio::net::TcpListener::bind(&config.server_address).await?;
     info!("Server starting on {}", config.server_address);