Evict archive writers on deletion and sweep idle archives (closes #89)

The per-webhook archiveWriter registry in the database delivery target
was never evicted, so a deleted webhook's writer -- and any archive
file handle open within its debounce window -- lingered for the process
lifetime. Separately, expiry pruning ran only when an archive was
(re)opened, and reopens only happen on writes, so an archive belonging
to a webhook that stopped receiving events kept its expired rows
forever.

Eviction: a new one-method delivery.WebhookEvictor interface (kept
separate from Notifier: archiving lifecycle is not notification) is
implemented by the Engine and injected into the handlers. Deleting a
webhook, or deleting its last database target, drops the writer from
the registry and closes its handle under the writer's own mutex, so
eviction can never race an in-flight write. An evicted writer refuses
further writes rather than reopening a file nothing holds. The archive
file is deliberately left on disk: it is long-term storage an operator
may want to keep or move away, and destroying it as a side effect of
deleting a webhook would be unrecoverable.

Idle sweep: a new ArchiveSweeper, modelled on the event RetentionReaper
(fx lifecycle hooks, cancellable context, WaitGroup, ticker loop),
prunes archives whose database target declares a positive expiry. It
reuses the existing RETENTION_SWEEP_INTERVAL rather than adding a
config key. It never creates an archive -- a missing file is skipped,
and the reopen uses SQLite mode=rw so the file cannot be conjured even
if it disappears mid-sweep -- routes the prune through the per-webhook
writer so its mutex orders the sweep against concurrent writes, and
leaves the archive closed so the move-the-file-away workflow keeps
working. A failure for one webhook is logged and the sweep continues.
Archives with no expiry or the expiry "never" are untouched.

README.md

@@ -544,12 +544,6 @@ afterwards so the move-the-file-away workflow keeps working. Archives
 with no expiry, or the expiry `never`, are not touched by the sweep at
 all.
 
-Note that a webhook has one archive file but may carry more than one
-`database` target, each with its own `expiry`. The shortest expiry
-configured on any of them therefore governs the whole archive, and the
-sweep applies it whether or not the webhook is still receiving events.
-Configure a single `database` target per webhook unless you intend that.
-
 Deleting a webhook releases its archive: the delivery engine's cached
 archive writer is dropped and its file handle closed, so nothing lingers
 after the webhook is gone. The archive **file itself is deliberately

TODO.md

@@ -10,11 +10,9 @@
 
 # Status
 
-pre-1.0. No git tags exist. main (4f5ecb1) is a working webhook proxy
+pre-1.0. No git tags exist. main (afe88c6) is a working webhook proxy
 with auth, CSRF/SSRF protections, login rate limiting, Slack target,
-event retention (#63), the database archiving target (#43), the admin
-password change flow (#65), policy compliance (#6), and pinned lint
-tooling (#55). Note: TODO.md was
+policy compliance (#6), and pinned lint tooling (#55). Note: TODO.md was
 deliberately deleted from this repo in f9a9569 (2026-03-01, #6); its
 content was folded into the README TODO section, which this draft
 reconstructs as of 2026-07-06.

internal/delivery/archive_sweeper.go

@@ -2,7 +2,6 @@ package delivery
 
 import (
 	"context"
-	"errors"
 	"log/slog"
 	"sync"
 	"time"
@@ -61,22 +60,9 @@ func NewArchiveSweeper(
 		interval: params.Config.RetentionSweepInterval,
 	}
 
-	s.registerHooks(lc)
-
-	return s
-}
-
-// registerHooks wires the sweeper's start and stop into the fx
-// lifecycle. Both hook contexts are deliberately ignored: see
-// start for why the background loop must not inherit the start
-// hook's context, and stop for why shutdown blocks on the loop
-// rather than on the stop hook's deadline.
-func (s *ArchiveSweeper) registerHooks(lc fx.Lifecycle) {
 	lc.Append(fx.Hook{
-		//nolint:contextcheck // Not passing the hook context is
-		// the point: see start.
-		OnStart: func(_ context.Context) error {
-			s.start()
+		OnStart: func(ctx context.Context) error {
+			s.start(ctx)
 
 			return nil
 		},
@@ -86,21 +72,12 @@ func (s *ArchiveSweeper) registerHooks(lc fx.Lifecycle) {
 			return nil
 		},
 	})
+
+	return s
 }
 
-// start launches the background sweep loop.
-//
-// The loop's context is derived from context.Background(), NOT
-// from the fx OnStart hook context. The hook context carries
-// fx's start timeout (15s by default), so a loop derived from it
-// is cancelled 15 seconds after the application starts — long
-// before the first tick under the default one-hour sweep
-// interval, leaving a sweeper that never sweeps. A long-lived
-// goroutine must outlive the startup phase, so its lifetime is
-// bounded by OnStop instead: stop cancels this context and waits
-// on the WaitGroup.
-func (s *ArchiveSweeper) start() {
-	ctx, cancel := context.WithCancel(context.Background())
+func (s *ArchiveSweeper) start(ctx context.Context) {
+	ctx, cancel := context.WithCancel(ctx)
 	s.cancel = cancel
 
 	s.wg.Add(1)
@@ -201,29 +178,12 @@ func (s *ArchiveSweeper) sweepTarget(target *database.Target) {
 	}
 
 	err = s.eng.dbTarget.sweepWebhook(target.WebhookID, expiry)
-	if err == nil {
-		return
-	}
-
-	// A writer evicted underneath the sweep means the operator
-	// deleted the webhook (or its last database target) while the
-	// sweep was walking the target list. That is an ordinary
-	// interleaving, not a failure, so it must not produce an
-	// error line.
-	if errors.Is(err, errArchiveWriterEvicted) {
-		s.log.Debug(
-			"archive sweep: writer evicted mid-sweep",
+	if err != nil {
+		s.log.Error(
+			"archive sweep: failed to prune archive",
 			"webhook_id", target.WebhookID,
 			"target_id", target.ID,
+			"error", err,
 		)
-
-		return
 	}
-
-	s.log.Error(
-		"archive sweep: failed to prune archive",
-		"webhook_id", target.WebhookID,
-		"target_id", target.ID,
-		"error", err,
-	)
 }

internal/delivery/archive_sweeper_test.go

@@ -5,7 +5,6 @@ import (
 	"database/sql"
 	"fmt"
 	"net/http"
-	"os"
 	"path/filepath"
 	"sync"
 	"testing"
@@ -14,7 +13,6 @@ import (
 	"github.com/google/uuid"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"go.uber.org/fx"
 	"gorm.io/driver/sqlite"
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
@@ -194,292 +192,6 @@ func archivedEventIDs(
 	return ids
 }
 
-// countArchivedRows counts the rows in an archive file without
-// asserting anything, so it is safe to poll from an
-// assert.Eventually condition (which runs off the test
-// goroutine, where testify assertions must not be used).
-func countArchivedRows(path string) (int64, error) {
-	sqlDB, err := sql.Open(
-		"sqlite", fmt.Sprintf("file:%s?mode=ro", path),
-	)
-	if err != nil {
-		return 0, err
-	}
-
-	defer func() { _ = sqlDB.Close() }()
-
-	gdb, err := gorm.Open(
-		sqlite.Dialector{Conn: sqlDB}, &gorm.Config{},
-	)
-	if err != nil {
-		return 0, err
-	}
-
-	var count int64
-
-	err = gdb.Model(&delivery.ExportArchivedEvent{}).
-		Count(&count).Error
-	if err != nil {
-		return 0, err
-	}
-
-	return count, nil
-}
-
-// captureLifecycle is a minimal fx.Lifecycle that records the
-// hooks a component registers, so a test can invoke the real
-// OnStart/OnStop functions with a context of its choosing.
-type captureLifecycle struct {
-	hooks []fx.Hook
-}
-
-func (l *captureLifecycle) Append(h fx.Hook) {
-	l.hooks = append(l.hooks, h)
-}
-
-// TestArchiveSweeper_LoopOutlivesStartHookContext is the
-// regression test for a sweeper that never swept. fx calls
-// OnStart with a context carrying the application's start
-// timeout (15 seconds by default), so a background loop whose
-// context is derived from it is cancelled 15 seconds into the
-// process — three quarters of an hour before the first tick
-// under the default one-hour sweep interval.
-//
-// The hook context here is already cancelled, which is the same
-// defect taken to its limit: a loop that inherits it never runs
-// a single tick, while a correctly rooted loop keeps sweeping
-// for as long as the process lives. Handing the hook a plain
-// context.Background() would assert nothing at all.
-func TestArchiveSweeper_LoopOutlivesStartHookContext(
-	t *testing.T,
-) {
-	t.Parallel()
-
-	env := setupSweeperTest(t)
-
-	webhookID := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
-
-	now := time.Now()
-	path := env.seedArchiveRows(
-		t, webhookID,
-		now.Add(-48*time.Hour),
-		now.Add(-time.Minute),
-	)
-
-	env.sweeper.ExportSetInterval(10 * time.Millisecond)
-
-	// Drive the genuine fx hooks the application registers,
-	// rather than a test-only entry point.
-	lc := &captureLifecycle{}
-	env.sweeper.ExportRegisterHooks(lc)
-	require.Len(t, lc.hooks, 1)
-
-	hookCtx, cancel := context.WithCancel(context.Background())
-	cancel()
-
-	require.NoError(t, lc.hooks[0].OnStart(hookCtx))
-
-	t.Cleanup(func() {
-		_ = lc.hooks[0].OnStop(context.Background())
-	})
-
-	assert.Eventually(
-		t,
-		func() bool {
-			count, err := countArchivedRows(path)
-
-			return err == nil && count == 1
-		},
-		5*time.Second,
-		10*time.Millisecond,
-		"the sweep loop must keep running after the start "+
-			"hook's context is done; it pruned nothing, so it "+
-			"inherited the hook context and died",
-	)
-}
-
-// TestArchiveSweep_DoesNotResurrectEvictedWriter covers the
-// interleaving where a sweep tick has already listed a webhook's
-// target when the webhook is deleted and its writer evicted. The
-// sweep must not put a writer back into the registry: nothing
-// would ever evict it again, which is precisely the leak this
-// change exists to close.
-func TestArchiveSweep_DoesNotResurrectEvictedWriter(
-	t *testing.T,
-) {
-	t.Parallel()
-
-	env := setupSweeperTest(t)
-
-	webhookID := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
-	env.seedArchiveRows(
-		t, webhookID, time.Now().Add(-48*time.Hour),
-	)
-
-	// Prime the registry the way a delivery would, then evict as
-	// the deletion path does. The target row is deliberately left
-	// in place: this is the tick that listed the webhook before
-	// the deletion committed.
-	_, err := env.eng.ExportEnsureArchiveWriter(webhookID)
-	require.NoError(t, err)
-
-	env.eng.EvictWebhook(webhookID)
-	require.False(t, env.eng.ExportHasArchiveWriter(webhookID))
-
-	env.sweeper.ExportSweep(context.Background())
-
-	assert.False(
-		t, env.eng.ExportHasArchiveWriter(webhookID),
-		"a sweep must never re-register a writer for a webhook "+
-			"whose registry entry has already been released",
-	)
-}
-
-// TestArchiveSweep_LeavesNoRegistryEntry states the same
-// invariant in its general form: sweeping an archive whose
-// webhook has no cached writer must not leave one behind, so the
-// registry keeps holding only writers a delivery created and an
-// eviction can reach.
-func TestArchiveSweep_LeavesNoRegistryEntry(t *testing.T) {
-	t.Parallel()
-
-	env := setupSweeperTest(t)
-
-	webhookID := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
-	path := env.seedArchiveRows(
-		t, webhookID,
-		time.Now().Add(-48*time.Hour),
-		time.Now().Add(-time.Minute),
-	)
-
-	require.False(t, env.eng.ExportHasArchiveWriter(webhookID))
-
-	env.sweeper.ExportSweep(context.Background())
-
-	assert.Equal(
-		t, []string{sweepRowNew}, archivedEventIDs(t, path),
-		"the sweep must still prune an idle archive",
-	)
-	assert.False(
-		t, env.eng.ExportHasArchiveWriter(webhookID),
-		"the sweep must release the registry entry it created",
-	)
-}
-
-// TestArchiveSweep_KeepsWriterAdoptedByDelivery is the other
-// half of that invariant: an entry the sweep created but a
-// delivery then claimed belongs to the registry and must survive
-// the sweep, or the delivery would be left holding a detached
-// writer with an open handle that no eviction can reach.
-func TestArchiveSweep_KeepsWriterAdoptedByDelivery(
-	t *testing.T,
-) {
-	t.Parallel()
-
-	env := setupSweeperTest(t)
-
-	webhookID := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
-	env.seedArchiveRows(
-		t, webhookID, time.Now().Add(-48*time.Hour),
-	)
-
-	webhookDB := testWebhookDB(t)
-	event := seedEvent(t, webhookDB, `{"n":1}`)
-	event.WebhookID = webhookID
-	d := seedDatabaseTargetDelivery(
-		t, webhookDB, event, `{"expiry":"1h"}`,
-	)
-
-	env.sweeper.ExportSweep(context.Background())
-	require.False(t, env.eng.ExportHasArchiveWriter(webhookID))
-
-	env.eng.ExportDeliverDatabase(webhookDB, d)
-
-	assert.True(
-		t, env.eng.ExportHasArchiveWriter(webhookID),
-		"a delivery's writer must stay registered",
-	)
-
-	env.sweeper.ExportSweep(context.Background())
-
-	assert.True(
-		t, env.eng.ExportHasArchiveWriter(webhookID),
-		"a sweep must not drop a writer a delivery owns",
-	)
-}
-
-// TestArchiveSweep_ContinuesAfterPerWebhookFailure proves a
-// failure for one webhook does not abort the sweep for the
-// others: an unparseable expiry and an unreadable archive both
-// have to be logged and stepped over.
-func TestArchiveSweep_ContinuesAfterPerWebhookFailure(
-	t *testing.T,
-) {
-	t.Parallel()
-
-	env := setupSweeperTest(t)
-
-	// Seeded first so the sweep reaches them before the healthy
-	// webhook: targets come back in insertion order.
-	badConfigID := env.seedDatabaseTarget(t, `{"expiry":"!!!"}`)
-	env.seedArchiveRows(
-		t, badConfigID, time.Now().Add(-48*time.Hour),
-	)
-
-	corruptID := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
-	require.NoError(t, os.WriteFile(
-		env.archivePath(corruptID),
-		[]byte("this is not a sqlite database"),
-		0o600,
-	))
-
-	healthyID := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
-	healthyPath := env.seedArchiveRows(
-		t, healthyID,
-		time.Now().Add(-48*time.Hour),
-		time.Now().Add(-time.Minute),
-	)
-
-	env.sweeper.ExportSweep(context.Background())
-
-	assert.Equal(
-		t, []string{sweepRowNew},
-		archivedEventIDs(t, healthyPath),
-		"a failure for an earlier webhook must not stop the "+
-			"sweep from pruning the ones after it",
-	)
-}
-
-// TestArchiveSweep_OpenExistingDoesNotCreateFile pins the second
-// of the two no-create guards. The first is the stat in
-// sweepWebhook; this one is the SQLite open mode, which is what
-// protects the window between that stat and the open. Flipping
-// the sweep's mode to create-if-missing makes this fail.
-func TestArchiveSweep_OpenExistingDoesNotCreateFile(
-	t *testing.T,
-) {
-	t.Parallel()
-
-	dir := t.TempDir()
-	path := filepath.Join(dir, "archive-absent.db")
-
-	w := delivery.NewExportArchiveWriter(
-		path, archiveTestLogger(), 0,
-	)
-
-	err := w.OpenExisting(time.Hour)
-
-	require.Error(
-		t, err,
-		"opening a missing archive without create permission "+
-			"must fail rather than conjure the file",
-	)
-
-	for _, suffix := range archiveFileSuffixes() {
-		assert.NoFileExists(t, path+suffix)
-	}
-}
-
 // TestArchiveSweep_PrunesIdleArchive is the core regression
 // test for this issue: an archive that receives no further
 // writes must still lose its expired rows. Before the sweeper
@@ -578,7 +290,7 @@ func TestArchiveSweep_DoesNotCreateArchiveFile(t *testing.T) {
 
 	env.sweeper.ExportSweep(context.Background())
 
-	for _, suffix := range archiveFileSuffixes() {
+	for _, suffix := range []string{"", "-wal", "-shm"} {
 		assert.NoFileExists(
 			t, path+suffix,
 			"the sweep must not create an archive file",
@@ -705,7 +417,7 @@ func TestArchiveSweeper_StopsCleanly(t *testing.T) {
 	)
 
 	env.sweeper.ExportSetInterval(time.Millisecond)
-	env.sweeper.ExportStart()
+	env.sweeper.ExportStart(context.Background())
 
 	// stop blocks on the loop's WaitGroup, so returning at all
 	// proves the loop observed the cancellation and exited.

internal/delivery/export_test.go

@@ -7,17 +7,10 @@ import (
 	"net/http"
 	"time"
 
-	"go.uber.org/fx"
 	"gorm.io/gorm"
 	"sneak.berlin/go/webhooker/internal/database"
 )
 
-// ErrExportArchiveWriterEvicted exposes the sentinel returned by
-// an evicted archive writer. It carries the Err prefix rather
-// than this file's usual Export one because it is a sentinel
-// error.
-var ErrExportArchiveWriterEvicted = errArchiveWriterEvicted
-
 // Exported constants for test access.
 const (
 	ExportDeliveryChannelSize     = deliveryChannelSize
@@ -335,59 +328,6 @@ func (e *ExportArchiveWriter) DB() *gorm.DB {
 	return e.w.db
 }
 
-// Path returns the archive file the writer owns.
-func (e *ExportArchiveWriter) Path() string {
-	return e.w.path
-}
-
-// OpenExisting opens the archive without permitting creation,
-// the way the idle sweep does.
-func (e *ExportArchiveWriter) OpenExisting(
-	expiry time.Duration,
-) error {
-	return e.w.openMode(archiveModeExisting, expiry)
-}
-
-// SweepExpired runs an idle sweep of the archive.
-func (e *ExportArchiveWriter) SweepExpired(
-	expiry time.Duration,
-) error {
-	return e.w.sweepExpired(expiry)
-}
-
-// Evict marks the writer evicted and closes its handle, exactly
-// as leaving the registry does.
-func (e *ExportArchiveWriter) Evict() {
-	e.w.evict()
-}
-
-// HandleOpen reports whether the writer currently holds an open
-// archive handle.
-func (e *ExportArchiveWriter) HandleOpen() bool {
-	e.w.mu.Lock()
-	defer e.w.mu.Unlock()
-
-	return e.w.db != nil
-}
-
-// ExportArchiveWriterFor returns the archive writer the registry
-// currently caches for a webhook, or nil when none is cached. It
-// never creates one, so a test can hold a reference to the very
-// writer an eviction is about to detach.
-func (e *Engine) ExportArchiveWriterFor(
-	webhookID string,
-) *ExportArchiveWriter {
-	e.dbTarget.mu.Lock()
-	defer e.dbTarget.mu.Unlock()
-
-	w, ok := e.dbTarget.writers[webhookID]
-	if !ok {
-		return nil
-	}
-
-	return &ExportArchiveWriter{w: w}
-}
-
 // ExportHasArchiveWriter reports whether the database target
 // currently caches an archive writer for a webhook.
 func (e *Engine) ExportHasArchiveWriter(
@@ -458,16 +398,8 @@ func (s *ArchiveSweeper) ExportSweep(ctx context.Context) {
 }
 
 // ExportStart starts the sweeper's background loop for tests.
-func (s *ArchiveSweeper) ExportStart() {
-	s.start()
-}
-
-// ExportRegisterHooks registers the sweeper's real fx lifecycle
-// hooks on a lifecycle supplied by a test, so a test can drive
-// the exact OnStart/OnStop functions the application runs and
-// hand OnStart the kind of context fx actually supplies.
-func (s *ArchiveSweeper) ExportRegisterHooks(lc fx.Lifecycle) {
-	s.registerHooks(lc)
+func (s *ArchiveSweeper) ExportStart(ctx context.Context) {
+	s.start(ctx)
 }
 
 // ExportStop stops the sweeper's background loop for tests.

internal/delivery/target_database.go

@@ -130,78 +130,9 @@ func (t *databaseTarget) writerFor(
 		t.writers[webhookID] = w
 	}
 
-	// A delivery claims the entry: even if the idle sweep created
-	// it moments ago, it now belongs to the registry proper and
-	// the sweep must leave it in place when it finishes.
-	w.sweepOwned = false
-
 	return w, nil
 }
 
-// sweepWriterFor returns the archive writer the idle sweep should
-// prune a webhook through, together with whether the sweep itself
-// created the registry entry.
-//
-// The sweep must route its prune through the registered writer so
-// the writer's mutex orders it against concurrent writes, but it
-// must never leave a registry entry behind: a sweep that ran
-// concurrently with the webhook's deletion would otherwise
-// re-create an entry that nothing will ever evict again, which is
-// exactly the leak eviction exists to prevent. An entry the sweep
-// creates is therefore marked sweep-owned and handed back to
-// releaseSweepWriter when the sweep is done.
-func (t *databaseTarget) sweepWriterFor(
-	webhookID string,
-) (*archiveWriter, bool, error) {
-	path, err := t.archivePath(webhookID)
-	if err != nil {
-		return nil, false, err
-	}
-
-	t.mu.Lock()
-	defer t.mu.Unlock()
-
-	if t.writers == nil {
-		t.writers = make(map[string]*archiveWriter)
-	}
-
-	w, ok := t.writers[webhookID]
-	if ok {
-		return w, false, nil
-	}
-
-	w = newArchiveWriter(path, t.eng.log)
-	w.sweepOwned = true
-	t.writers[webhookID] = w
-
-	return w, true, nil
-}
-
-// releaseSweepWriter drops a registry entry that the idle sweep
-// created, so a sweep leaves the registry exactly as it found it.
-//
-// The entry is removed only if it is still the very writer the
-// sweep installed and no delivery has claimed it in the meantime
-// (writerFor clears sweepOwned when it hands a writer to the
-// write path). Both conditions are evaluated under the registry
-// lock, so an eviction that raced the sweep — which removes the
-// entry outright — simply finds nothing left to do here, and a
-// delivery that adopted the writer keeps a registered, evictable
-// one.
-func (t *databaseTarget) releaseSweepWriter(
-	webhookID string, w *archiveWriter,
-) {
-	t.mu.Lock()
-	defer t.mu.Unlock()
-
-	cur, ok := t.writers[webhookID]
-	if !ok || cur != w || !cur.sweepOwned {
-		return
-	}
-
-	delete(t.writers, webhookID)
-}
-
 // archivePath returns the archive file path for a webhook: it
 // lives beside the per-webhook event database in the data
 // directory. It does not touch the filesystem.
@@ -262,11 +193,6 @@ func (t *databaseTarget) evict(webhookID string) {
 // do) when the archive file does not exist, so a sweep never
 // creates an archive for a webhook that has a database target
 // but has never received an event.
-//
-// It also never leaves a registry entry behind: an entry it had
-// to create to reach the writer's mutex is released again once
-// the prune is done, so a sweep racing a webhook deletion cannot
-// resurrect the writer the eviction just dropped.
 func (t *databaseTarget) sweepWebhook(
 	webhookID string, expiry time.Duration,
 ) error {
@@ -282,14 +208,10 @@ func (t *databaseTarget) sweepWebhook(
 		return nil
 	}
 
-	w, created, err := t.sweepWriterFor(webhookID)
+	w, err := t.writerFor(webhookID)
 	if err != nil {
 		return err
 	}
 
-	if created {
-		defer t.releaseSweepWriter(webhookID, w)
-	}
-
 	return w.sweepExpired(expiry)
 }

internal/delivery/target_database_archive.go

@@ -190,19 +190,6 @@ type archiveWriter struct {
 	// never open the file again: nothing holds it any more, so a
 	// reopen would leak the handle for the process lifetime.
 	evicted bool
-
-	// sweepOwned marks a registry entry that the idle sweep
-	// created because no writer was cached for the webhook. The
-	// sweep removes such an entry again when it is done, so a
-	// sweep can never leave — or resurrect — a registry entry
-	// for a webhook that has been deleted. A delivery that adopts
-	// the writer clears the flag, handing the entry to the
-	// registry proper.
-	//
-	// Unlike every other field here it is guarded by
-	// databaseTarget.mu, not by this writer's mu: it describes the
-	// registry entry rather than the file.
-	sweepOwned bool
 }
 
 // newArchiveWriter builds an archiveWriter for a file path with

internal/delivery/target_database_evict_test.go

@@ -1,12 +1,9 @@
 package delivery_test
 
 import (
-	"errors"
 	"fmt"
 	"net/http"
-	"os"
 	"path/filepath"
-	"sync"
 	"testing"
 	"time"
 
@@ -99,241 +96,11 @@ func TestEvictWebhook_UnknownWebhookIsNoOp(t *testing.T) {
 	)
 }
 
-// evictTestRow builds an archive row for the eviction tests.
-func evictTestRow(eventID string) delivery.ExportArchivedEvent {
-	return delivery.ExportArchivedEvent{
-		EventID:   eventID,
-		WebhookID: "wh-evict",
-		Method:    http.MethodPost,
-		Body:      `{"seeded":true}`,
-	}
-}
-
-// TestEvictedWriter_WriteDoesNotReopenFile is the direct test of
-// the evicted guard on the write path. A writer that has left
-// the registry is held by nobody, so a handle it opened could
-// never be closed again: it must refuse the write outright
-// rather than recreate the archive behind the registry's back.
-//
-// The archive file is removed before the eviction, so an
-// unguarded write is unmistakable — it recreates the file.
-func TestEvictedWriter_WriteDoesNotReopenFile(t *testing.T) {
-	t.Parallel()
-
-	path := filepath.Join(t.TempDir(), "archive-evicted.db")
-
-	w := delivery.NewExportArchiveWriter(
-		path, archiveTestLogger(), 0,
-	)
-
-	require.NoError(t, w.Write(evictTestRow("ev-1"), 0))
-	require.FileExists(t, path)
-
-	// The operator moves the archive away for offline retention,
-	// which the write path would ordinarily undo on the next
-	// write by recreating the file.
-	require.NoError(t, os.Remove(path))
-
-	w.Evict()
-
-	err := w.Write(evictTestRow("ev-2"), 0)
-
-	require.ErrorIs(
-		t, err, delivery.ErrExportArchiveWriterEvicted,
-		"an evicted writer must refuse writes",
-	)
-	assert.NoFileExists(
-		t, path,
-		"an evicted writer must not reopen (or recreate) the "+
-			"archive file",
-	)
-	assert.False(
-		t, w.HandleOpen(),
-		"an evicted writer must hold no handle",
-	)
-}
-
-// TestEvictedWriter_SweepDoesNotReopenFile is the same test for
-// the sweep path: an idle sweep that reaches a writer already
-// evicted underneath it must return the sentinel rather than
-// reopen a file nothing owns.
-func TestEvictedWriter_SweepDoesNotReopenFile(t *testing.T) {
-	t.Parallel()
-
-	path := filepath.Join(t.TempDir(), "archive-evicted.db")
-
-	w := delivery.NewExportArchiveWriter(
-		path, archiveTestLogger(), 0,
-	)
-
-	require.NoError(t, w.Write(evictTestRow("ev-1"), 0))
-	require.FileExists(t, path)
-
-	w.Evict()
-
-	err := w.SweepExpired(time.Hour)
-
-	require.ErrorIs(
-		t, err, delivery.ErrExportArchiveWriterEvicted,
-		"an evicted writer must refuse an idle sweep",
-	)
-	assert.False(
-		t, w.HandleOpen(),
-		"a refused sweep must not leave a handle open",
-	)
-}
-
-// racingWrites drives a pack of goroutines writing to one
-// archive writer until each is refused, so an eviction on the
-// test goroutine has to take the writer's mutex away from writes
-// that are already contending for it.
-type racingWrites struct {
-	wg         sync.WaitGroup
-	mu         sync.Mutex
-	sawEvicted bool
-	otherErr   error
-	started    chan struct{}
-}
-
-// racingWriteGoroutines is how many goroutines contend for the
-// writer's mutex while the eviction lands.
-const racingWriteGoroutines = 4
-
-// startRacingWrites launches the writing goroutines. Each writes
-// in a loop and stops at its first error, recording whether that
-// error was the eviction sentinel. The deadline is a backstop
-// against a hang, not a timing assumption: the first write after
-// the eviction is refused.
-func startRacingWrites(
-	w *delivery.ExportArchiveWriter,
-) *racingWrites {
-	r := &racingWrites{
-		started: make(chan struct{}, racingWriteGoroutines),
-	}
-
-	deadline := time.Now().Add(10 * time.Second)
-
-	r.wg.Add(racingWriteGoroutines)
-
-	for i := range racingWriteGoroutines {
-		go func() {
-			defer r.wg.Done()
-
-			first := true
-
-			for time.Now().Before(deadline) {
-				err := w.Write(
-					evictTestRow(fmt.Sprintf("ev-%d", i)), 0,
-				)
-
-				if first {
-					r.started <- struct{}{}
-
-					first = false
-				}
-
-				if err == nil {
-					continue
-				}
-
-				r.record(err)
-
-				return
-			}
-		}()
-	}
-
-	return r
-}
-
-// record classifies the error that stopped one goroutine.
-func (r *racingWrites) record(err error) {
-	r.mu.Lock()
-	defer r.mu.Unlock()
-
-	if errors.Is(err, delivery.ErrExportArchiveWriterEvicted) {
-		r.sawEvicted = true
-
-		return
-	}
-
-	r.otherErr = err
-}
-
-// awaitFirstWrite blocks until at least one write has run, so
-// the eviction that follows is a genuine race.
-func (r *racingWrites) awaitFirstWrite() {
-	<-r.started
-}
-
-// wait joins the goroutines and reports whether any write was
-// refused with the eviction sentinel, plus any unexpected error.
-func (r *racingWrites) wait() (bool, error) {
-	r.wg.Wait()
-
-	r.mu.Lock()
-	defer r.mu.Unlock()
-
-	return r.sawEvicted, r.otherErr
-}
-
-// TestEvictWebhook_RacingWriteDoesNotReopenHandle exercises the
-// interleaving the evicted flag exists for: writes already
-// contending for the writer's mutex when the eviction takes it.
-// The write that wins the mutex after the eviction must abandon
-// its work rather than reopen the archive, leaving the writer
-// permanently handle-free. Run under -race.
-func TestEvictWebhook_RacingWriteDoesNotReopenHandle(
-	t *testing.T,
-) {
-	t.Parallel()
-
-	eng, _ := evictTestEngine(t)
-
-	webhookDB := testWebhookDB(t)
-	event := seedEvent(t, webhookDB, `{"archived":true}`)
-	d := seedDatabaseTargetDelivery(t, webhookDB, event, "")
-
-	// Prime the registry so the test can hold the very writer the
-	// eviction is about to detach.
-	eng.ExportDeliverDatabase(webhookDB, d)
-
-	w := eng.ExportArchiveWriterFor(event.WebhookID)
-	require.NotNil(t, w)
-	require.True(t, w.HandleOpen())
-
-	race := startRacingWrites(w)
-
-	// Evict only once writes are genuinely in flight, so the
-	// eviction has to contend for the writer's mutex.
-	race.awaitFirstWrite()
-
-	eng.EvictWebhook(event.WebhookID)
-
-	sawEvicted, otherErr := race.wait()
-
-	require.NoError(t, otherErr)
-	assert.True(
-		t, sawEvicted,
-		"a write after eviction must be refused",
-	)
-	assert.False(
-		t, w.HandleOpen(),
-		"no write may reopen the archive once the writer has "+
-			"been evicted",
-	)
-	assert.False(
-		t, eng.ExportHasArchiveWriter(event.WebhookID),
-		"the registry entry must stay gone",
-	)
-}
-
-// TestEvictWebhook_LaterDeliveryRecreatesWriter proves eviction
-// does not break archiving for a webhook that is still alive: a
-// subsequent delivery gets a brand new writer from the registry.
-// It says nothing about the evicted writer itself — that is what
-// TestEvictedWriter_WriteDoesNotReopenFile covers.
-func TestEvictWebhook_LaterDeliveryRecreatesWriter(t *testing.T) {
+// TestEvictWebhook_EvictedWriterDoesNotReopen proves an evicted
+// writer refuses further writes instead of silently reopening
+// the archive file: nothing holds it any more, so a reopened
+// handle would leak.
+func TestEvictWebhook_EvictedWriterDoesNotReopen(t *testing.T) {
 	t.Parallel()
 
 	eng, _ := evictTestEngine(t)

internal/delivery/target_database_test.go

@@ -50,13 +50,6 @@ func openArchiveDBForRead(
 	return gdb
 }
 
-// archiveFileSuffixes returns the archive file itself and the
-// SQLite sidecars that accompany an open database. A test that
-// asserts no archive was created has to check all of them.
-func archiveFileSuffixes() []string {
-	return []string{"", "-wal", "-shm"}
-}
-
 // removeArchiveFiles simulates an operator moving the archive
 // away by deleting the SQLite file and its sidecar files.
 func removeArchiveFiles(t *testing.T, path string) {

internal/handlers/source_delete_test.go

@@ -257,59 +257,9 @@ func TestHandleTargetDelete_EvictsWhenLastDatabaseTargetGone(
 	)
 }
 
-// TestHandleTargetDelete_KeepsWriterWhenDatabaseTargetRemains
-// proves that deleting one of several database targets leaves
-// the still-needed archive writer alone: the surviving target
-// keeps archiving to the same file, so the writer must stay.
-func TestHandleTargetDelete_KeepsWriterWhenDatabaseTargetRemains(
-	t *testing.T,
-) {
-	t.Parallel()
-
-	var (
-		h    *handlers.Handlers
-		sess *session.Session
-		db   *database.Database
-		ev   *recordingEvictor
-	)
-
-	app := newTestApp(t, &h, &sess, &db, &ev)
-	app.RequireStart()
-
-	t.Cleanup(app.RequireStop)
-
-	wh := seedWebhook(t, db)
-	doomed := seedTarget(
-		t, db, wh.ID, database.TargetTypeDatabase,
-	)
-	seedTarget(t, db, wh.ID, database.TargetTypeDatabase)
-
-	cookies := authenticatedCookies(
-		t, sess, deleteTestUserID, deleteTestUsername,
-	)
-
-	req := postRequest(
-		"/source/"+wh.ID+"/targets/"+doomed.ID+"/delete",
-		cookies,
-		map[string]string{
-			paramSourceID: wh.ID,
-			paramTargetID: doomed.ID,
-		},
-	)
-	w := httptest.NewRecorder()
-
-	h.HandleTargetDelete().ServeHTTP(w, req)
-
-	require.Equal(t, http.StatusSeeOther, w.Code)
-	assert.Empty(
-		t, ev.Evicted(),
-		"a second database target still needs the writer",
-	)
-}
-
 // TestHandleTargetDelete_KeepsWriterWhileDatabaseTargetRemains
-// proves that deleting an unrelated target type leaves a
-// still-needed archive writer alone.
+// proves that deleting an unrelated target, or one of several
+// database targets, leaves a still-needed archive writer alone.
 func TestHandleTargetDelete_KeepsWriterWhileDatabaseTargetRemains(
 	t *testing.T,
 ) {