pinakes-server: bound session concurrency; handle JoinError; make analytics

retention configurable

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Iaa35af821862eeadba0a4f384b2aec2c6a6a6964

crates/pinakes-server/src/state.rs

@@ -12,11 +12,15 @@ use pinakes_core::{
   sync::ChunkedUploadManager,
   transcode::TranscodeService,
 };
-use tokio::sync::RwLock;
+use tokio::sync::{RwLock, Semaphore};
 
 // Note: Sessions are now stored in the database via StorageBackend
 // See storage::SessionData and related methods
 
+/// Max concurrent background session operations (touch/delete).
+/// Prevents unbounded task spawning under high request load.
+pub const MAX_SESSION_BACKGROUND_TASKS: usize = 64;
+
 #[derive(Clone)]
 pub struct AppState {
   pub storage:                DynStorageBackend,
@@ -30,4 +34,5 @@ pub struct AppState {
   pub transcode_service:      Option<Arc<TranscodeService>>,
   pub managed_storage:        Option<Arc<ManagedStorageService>>,
   pub chunked_upload_manager: Option<Arc<ChunkedUploadManager>>,
+  pub session_semaphore:      Arc<Semaphore>,
 }