initial boilerplate

internal/inflation/worker.go

@@ -0,0 +1,44 @@
+// Package inflation contains the background worker that refreshes
+// the price_snapshots table used by the dashboard charts.
+package inflation
+
+import (
+	"context"
+	"log"
+	"time"
+
+	"github.com/yourname/deflated/internal/db"
+)
+
+// StartRefreshWorker runs in a goroutine and refreshes price snapshots
+// every interval. Call this from main() after connecting to the database.
+//
+// Example:
+//
+//	go inflation.StartRefreshWorker(ctx, queries, 1*time.Hour)
+func StartRefreshWorker(ctx context.Context, q *db.Queries, interval time.Duration) {
+	// Run once immediately on startup so the charts aren't empty
+	runRefresh(ctx, q)
+
+	ticker := time.NewTicker(interval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ticker.C:
+			runRefresh(ctx, q)
+		case <-ctx.Done():
+			log.Println("inflation refresh worker stopped")
+			return
+		}
+	}
+}
+
+func runRefresh(ctx context.Context, q *db.Queries) {
+	start := time.Now()
+	if err := q.RefreshPriceSnapshots(ctx); err != nil {
+		log.Printf("error refreshing price snapshots: %v", err)
+		return
+	}
+	log.Printf("price snapshots refreshed in %s", time.Since(start).Round(time.Millisecond))
+}