fix(offsite): 复制新归档后补打并上传 DB 包，桶内无记录的归档过最长保留期后清理

internal/pgint/offsite_test.go

@@ -0,0 +1,60 @@
+//go:build pgint
+
+package pgint
+
+import (
+	"context"
+	"slices"
+	"testing"
+	"time"
+
+	"felis.lolicon.best/internal/offsite"
+	"felis.lolicon.best/internal/reaper"
+)
+
+// TestOffsiteCatalogNewestCopyAndKeptRefs: the two reads behind the off-site
+// copy's snapshot and sweep. NewestOffsite is the latest copy of any row;
+// KeptRefs keeps a present archive past its expiry (the reaper expires it, not
+// the sweep) and a deleted one until its expires_at, and nothing after.
+func TestOffsiteCatalogNewestCopyAndKeptRefs(t *testing.T) {
+	ctx := context.Background()
+	cat := offsite.PGCatalog{DB: db}
+	sfx := suffix(t)
+	server := "offsite-" + sfx
+	t.Cleanup(func() { db.ExecContext(ctx, `DELETE FROM world_backups WHERE server_name = $1`, server) })
+	now := time.Now().UTC().Truncate(time.Microsecond)
+	// Later than any copy another test records.
+	latest := now.Add(1000 * reaper.Day)
+	insert := func(id, status string, expires time.Time, offsiteAt any) string {
+		t.Helper()
+		ref := "/archives/" + id + "-" + sfx + ".tar.gz"
+		mustExec(t, `INSERT INTO world_backups (id, server_name, backup_ref, size_bytes, reason, status, created_at, expires_at, offsite_at)
+			VALUES ($1, $2, $3, 1, 'manual', $4, $5, $6, $7)`,
+			id+"-"+sfx, server, ref, status, now.Add(-reaper.Day), expires, offsiteAt)
+		return ref
+	}
+	presentPast := insert("present-past", "present", now.Add(-time.Minute), nil)
+	deletedLive := insert("deleted-live", "deleted", now.Add(reaper.Day), now)
+	deletedGone := insert("deleted-gone", "deleted", now.Add(-time.Minute), now)
+	expiredGone := insert("expired-gone", "expired", now.Add(-time.Minute), nil)
+	insert("newest-copy", "deleted", now.Add(-time.Minute), latest)
+
+	got, err := cat.NewestOffsite(ctx)
+	if err != nil || !got.Equal(latest) {
+		t.Fatalf("NewestOffsite = %v, %v; want %v", got, err, latest)
+	}
+	refs, err := cat.KeptRefs(ctx, now)
+	if err != nil {
+		t.Fatalf("KeptRefs: %v", err)
+	}
+	for _, want := range []string{presentPast, deletedLive} {
+		if !slices.Contains(refs, want) {
+			t.Errorf("KeptRefs lacks %s", want)
+		}
+	}
+	for _, gone := range []string{deletedGone, expiredGone} {
+		if slices.Contains(refs, gone) {
+			t.Errorf("KeptRefs keeps %s, past its expiry", gone)
+		}
+	}
+}