feat(backend): set application_name on database connections

Tag pooled connections with application_name="tanabata-backend" via the
parsed pgxpool config, so the backend's sessions are identifiable in
pg_stat_activity and server logs. An application_name supplied in the
DSN (or PGAPPNAME) still takes precedence.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/internal/db/postgres/postgres.go

@@ -11,12 +11,30 @@ import (
 	"tanabata/backend/internal/db"
 )
 
+// appName tags every connection as application_name, so the backend's sessions
+// are identifiable in pg_stat_activity and server logs (and distinguishable from
+// e.g. goose migrations or a psql shell).
+const appName = "tanabata-backend"
+
 // NewPool creates and validates a *pgxpool.Pool from the given connection URL.
 // The pool is ready to use; the caller is responsible for closing it.
 func NewPool(ctx context.Context, url string) (*pgxpool.Pool, error) {
-	pool, err := pgxpool.New(ctx, url)
+	cfg, err := pgxpool.ParseConfig(url)
 	if err != nil {
-		return nil, fmt.Errorf("pgxpool.New: %w", err)
+		return nil, fmt.Errorf("pgxpool.ParseConfig: %w", err)
+	}
+	// Set application_name unless the operator already specified one in the DSN
+	// (or via PGAPPNAME), so an explicit override still wins.
+	if cfg.ConnConfig.RuntimeParams == nil {
+		cfg.ConnConfig.RuntimeParams = map[string]string{}
+	}
+	if cfg.ConnConfig.RuntimeParams["application_name"] == "" {
+		cfg.ConnConfig.RuntimeParams["application_name"] = appName
+	}
+
+	pool, err := pgxpool.NewWithConfig(ctx, cfg)
+	if err != nil {
+		return nil, fmt.Errorf("pgxpool.NewWithConfig: %w", err)
 	}
 	if err := pool.Ping(ctx); err != nil {
 		pool.Close()

frontend/src/lib/api/client.ts

@@ -128,8 +128,13 @@ async function request<T>(path: string, init?: RequestInit): Promise<T> {
 
 	invalidateSectionCache(path, (init?.method ?? 'GET').toUpperCase());
 
+	// A success doesn't guarantee a JSON body: 204 never has one, and some 200/201
+	// responses (e.g. POST /pools/:id/files) complete with an empty body. Parsing
+	// those as JSON throws, so read the text first and only parse when present —
+	// otherwise an empty 201 would surface as a spurious "failed" error.
 	if (res.status === 204) return undefined as T;
-	return res.json();
+	const text = await res.text();
+	return (text ? JSON.parse(text) : undefined) as T;
 }
 
 /** Upload with XHR so we can track progress via onProgress(0–100). */

frontend/static/manifest.webmanifest

@@ -35,21 +35,28 @@
       "type": "image/png"
     },
     {
-      "src": "/images/android-icon-192x192.png",
+      "src": "/images/pwa-192x192.png",
       "sizes": "192x192",
       "type": "image/png",
       "purpose": "any"
     },
     {
-      "src": "/images/apple-icon-180x180.png",
+      "src": "/images/pwa-512x512.png",
-      "sizes": "180x180",
+      "sizes": "512x512",
-      "type": "image/png"
+      "type": "image/png",
+      "purpose": "any"
     },
     {
-      "src": "/images/ms-icon-310x310.png",
+      "src": "/images/pwa-maskable-192x192.png",
-      "sizes": "310x310",
+      "sizes": "192x192",
       "type": "image/png",
-      "purpose": "any maskable"
+      "purpose": "maskable"
+    },
+    {
+      "src": "/images/pwa-maskable-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
     }
   ]
 }