Store a target's settings as columns (closes #543)

A target's settings move from the per-type JSON string in
targets.config to columns: url, headers, timeout_seconds,
forward_query, archive_expiry and archive_rotation. A column a type
does not use stays empty. headers holds the header map as JSON text
through GORM's JSON serializer, and archive_expiry holds a
time.Duration, 0 meaning never. The forms check each setting once,
with the same refusals and messages, and the edit form is filled from
the columns, so the per-type config structs, their parsers and the
"could not be read" branches are gone. A delivery task carries the
six settings in place of the JSON string; tests check that each copy
into a task, and back out of one, keeps all six.

Model: opus-5-5

internal/archive/archive.go

@@ -143,26 +143,15 @@ func archiveNamePart(name string) string {
 }
 
 // Write writes the full event of a delivery to a database target as
-// a row into the target's archive database, honouring the optional
-// per-target expiry and rotation parsed from the target config JSON.
-// With rotation, the event goes to the file for the period of its
-// receive time.
+// a row into the target's archive database, honouring the target's
+// ArchiveExpiry and ArchiveRotation. With rotation, the event goes to
+// the file for the period of its receive time.
 func (ws *Writers) Write(d *database.Delivery) error {
 	webhookID := d.Event.WebhookID
 	if webhookID == "" {
 		return errArchiveMissingWebhookID
 	}
 
-	expiry, err := ParseExpiry(d.Target.Config)
-	if err != nil {
-		return err
-	}
-
-	rotation, err := ParseRotation(d.Target.Config)
-	if err != nil {
-		return err
-	}
-
 	// An event whose stored row was gone before its delivery ran has
 	// no receive time (see delivery's Engine.hydrateEvent), and goes
 	// to the file for now.
@@ -187,7 +176,10 @@ func (ws *Writers) Write(d *database.Delivery) error {
 		ContentType:  d.Event.ContentType,
 	}
 
-	return w.write(row, expiry, archivePeriod(rotation, receivedAt))
+	return w.write(
+		row, d.Target.ArchiveExpiry,
+		archivePeriod(d.Target.ArchiveRotation, receivedAt),
+	)
 }
 
 // Rename implements Archives. It renames every one of a database

internal/archive/archive_test.go

@@ -123,9 +123,10 @@ func databaseTargetDelivery(
 		TargetID: tgt.ID,
 		Event:    event,
 		Target: database.Target{
-			Name:   tgt.Name,
-			Type:   database.TargetTypeDatabase,
-			Config: tgt.Config,
+			Name:            tgt.Name,
+			Type:            database.TargetTypeDatabase,
+			ArchiveExpiry:   tgt.ArchiveExpiry,
+			ArchiveRotation: tgt.ArchiveRotation,
 		},
 	}
 }
@@ -355,13 +356,16 @@ func TestParseArchiveExpiry(t *testing.T) {
 		want    time.Duration
 		wantErr bool
 	}{
-		{"empty config", "", 0, false},
-		{"explicit never", `{"expiry":"never"}`, 0, false},
-		{"empty expiry", `{"expiry":""}`, 0, false},
-		{"duration", `{"expiry":"1h"}`, time.Hour, false},
-		{"unparseable", `{"expiry":"nonsense"}`, 0, true},
-		{"zero duration", `{"expiry":"0s"}`, 0, true},
-		{"negative duration", `{"expiry":"-5h"}`, 0, true},
+		{"empty", "", 0, false},
+		{"explicit never", "never", 0, false},
+		{"hour", "1h", time.Hour, false},
+		{"thirty days", "720h", 720 * time.Hour, false},
+		{"minutes", "30m", 30 * time.Minute, false},
+		{"unparseable", "nonsense", 0, true},
+		{"days are not a Go unit", "7d", 0, true},
+		{"zero duration", "0s", 0, true},
+		{"bare zero", "0", 0, true},
+		{"negative duration", "-5h", 0, true},
 	}
 
 	for _, tc := range cases {
@@ -381,26 +385,6 @@ func TestParseArchiveExpiry(t *testing.T) {
 	}
 }
 
-func TestValidateArchiveExpiry(t *testing.T) {
-	t.Parallel()
-
-	valid := []string{"", "never", "1h", "720h", "30m"}
-	for _, in := range valid {
-		require.NoError(t,
-			archive.ValidateExpiry(in),
-			"expiry %q should be accepted", in,
-		)
-	}
-
-	invalid := []string{"nonsense", "7d", "-5h", "0s", "0"}
-	for _, in := range invalid {
-		require.Error(t,
-			archive.ValidateExpiry(in),
-			"expiry %q should be rejected", in,
-		)
-	}
-}
-
 // TestArchiveFileName pins the archive file name and the rules
 // that make a webhook or target name safe to put in it.
 func TestArchiveFileName(t *testing.T) {
@@ -473,8 +457,8 @@ func TestWrite_EachTargetHasItsOwnArchive(t *testing.T) {
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	first := env.seedDatabaseTarget(t, "")
-	second := env.addDatabaseTarget(t, first.WebhookID, "")
+	first := env.seedDatabaseTarget(t, 0, "")
+	second := env.addDatabaseTarget(t, first.WebhookID, 0, "")
 
 	event := newEvent(`{"n":1}`)
 
@@ -503,7 +487,7 @@ func TestRename_MovesTheFile(t *testing.T) {
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	tgt := env.seedDatabaseTarget(t, "")
+	tgt := env.seedDatabaseTarget(t, 0, "")
 	oldPath := env.archivePath(tgt)
 
 	first := newEvent(`{"n":1}`)
@@ -545,7 +529,7 @@ func TestRename_NeverReplacesAFile(t *testing.T) {
 			t.Parallel()
 
 			env := setupArchiveTest(t)
-			tgt := env.seedDatabaseTarget(t, "")
+			tgt := env.seedDatabaseTarget(t, 0, "")
 			oldPath := env.archivePath(tgt)
 
 			first := newEvent(`{"n":1}`)
@@ -593,7 +577,7 @@ func TestRename_BeforeTheNameIsSaved(t *testing.T) {
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	tgt := env.seedDatabaseTarget(t, "")
+	tgt := env.seedDatabaseTarget(t, 0, "")
 
 	require.NoError(
 		t, env.writers.Rename(tgt.ID, "Orders", "Archive"),
@@ -721,7 +705,7 @@ func TestRenameLock_HeldByOneEditAtATime(t *testing.T) {
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	tgt := env.seedDatabaseTarget(t, "")
+	tgt := env.seedDatabaseTarget(t, 0, "")
 	event := newEvent(`{"n":1}`)
 
 	env.writers.RenameLock().Lock()

internal/archive/evict_test.go

@@ -37,9 +37,9 @@ func TestEvictWebhook_ClosesAndRemovesWriter(t *testing.T) {
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	first := env.seedDatabaseTarget(t, "")
-	second := env.addDatabaseTarget(t, first.WebhookID, "")
-	other := env.seedDatabaseTarget(t, "")
+	first := env.seedDatabaseTarget(t, 0, "")
+	second := env.addDatabaseTarget(t, first.WebhookID, 0, "")
+	other := env.seedDatabaseTarget(t, 0, "")
 
 	for _, tgt := range []*database.Target{first, second, other} {
 		deliverTo(t, env, tgt)
@@ -80,8 +80,8 @@ func TestEvictTarget_LeavesOtherTargets(t *testing.T) {
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	doomed := env.seedDatabaseTarget(t, "")
-	kept := env.addDatabaseTarget(t, doomed.WebhookID, "")
+	doomed := env.seedDatabaseTarget(t, 0, "")
+	kept := env.addDatabaseTarget(t, doomed.WebhookID, 0, "")
 
 	deliverTo(t, env, doomed)
 	deliverTo(t, env, kept)
@@ -310,7 +310,7 @@ func TestEvictWebhook_RacingWriteDoesNotReopenHandle(
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	tgt := env.seedDatabaseTarget(t, "")
+	tgt := env.seedDatabaseTarget(t, 0, "")
 
 	// Prime the registry so the test can hold the very writer the
 	// eviction is about to detach.
@@ -355,7 +355,7 @@ func TestEvictWebhook_LaterDeliveryRecreatesWriter(t *testing.T) {
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	tgt := env.seedDatabaseTarget(t, "")
+	tgt := env.seedDatabaseTarget(t, 0, "")
 
 	deliverTo(t, env, tgt)
 	require.True(t, env.writers.ExportHasArchiveWriter(tgt.ID))
@@ -380,7 +380,7 @@ func TestEvictAll_WriteAfterIsRefused(t *testing.T) {
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	tgt := env.seedDatabaseTarget(t, "")
+	tgt := env.seedDatabaseTarget(t, 0, "")
 
 	deliverTo(t, env, tgt)
 

internal/archive/rotation.go

@@ -1,7 +1,6 @@
 package archive
 
 import (
-	"encoding/json"
 	"errors"
 	"fmt"
 	"os"
@@ -54,35 +53,10 @@ func ValidateRotation(rotation string) error {
 	}
 }
 
-// ParseRotation reads the rotation from a database target's
-// config JSON. An empty config or an empty rotation is none.
-func ParseRotation(configJSON string) (string, error) {
-	if configJSON == "" {
-		return archiveRotationNone, nil
-	}
-
-	var cfg DatabaseTargetConfig
-
-	err := json.Unmarshal([]byte(configJSON), &cfg)
-	if err != nil {
-		return "", fmt.Errorf("parsing database target config: %w", err)
-	}
-
-	err = ValidateRotation(cfg.Rotation)
-	if err != nil {
-		return "", err
-	}
-
-	if cfg.Rotation == "" {
-		return archiveRotationNone, nil
-	}
-
-	return cfg.Rotation, nil
-}
-
 // archivePeriod returns the period, in UTC, that a rotation puts an
 // event received at receivedAt in: "2026-10" for monthly,
-// "2026-10-01" for daily, "2026-10-01-19" for hourly, and "" for none.
+// "2026-10-01" for daily, "2026-10-01-19" for hourly, and "" for none
+// or an empty rotation.
 func archivePeriod(rotation string, receivedAt time.Time) string {
 	switch rotation {
 	case archiveRotationMonthly:
@@ -115,16 +89,11 @@ func PathAt(
 	webhook *database.Webhook,
 	target *database.Target,
 	receivedAt time.Time,
-) (string, error) {
-	rotation, err := ParseRotation(target.Config)
-	if err != nil {
-		return "", err
-	}
-
+) string {
 	return archivePeriodPath(
 		Path(dbMgr, webhook, target),
-		archivePeriod(rotation, receivedAt),
-	), nil
+		archivePeriod(target.ArchiveRotation, receivedAt),
+	)
 }
 
 // archiveFiles lists the database target's archive files that exist,

internal/archive/rotation_test.go

@@ -14,16 +14,12 @@ import (
 	"sneak.berlin/go/webhooker/internal/database/databasetest"
 )
 
-// The archive rotations, and the configs of a daily target and of one
-// whose rotation is not one of the four.
+// The archive rotations.
 const (
 	rotationNone    = "none"
 	rotationMonthly = "monthly"
 	rotationDaily   = "daily"
 	rotationHourly  = "hourly"
-
-	dailyConfig  = `{"rotation":"daily"}`
-	weeklyConfig = `{"rotation":"weekly"}`
 )
 
 // The periods the tests archive into most: two days, and an hour of
@@ -108,7 +104,7 @@ func TestWrite_RotatesAtEachPeriodBoundary(t *testing.T) {
 			t.Parallel()
 
 			env := setupArchiveTest(t)
-			tgt := env.seedDatabaseTarget(t, `{"rotation":"`+tc.rotation+`"}`)
+			tgt := env.seedDatabaseTarget(t, 0, tc.rotation)
 			path := env.archivePath(tgt)
 
 			first := env.deliverReceivedAt(t, tgt, tc.before)
@@ -127,7 +123,7 @@ func TestWrite_RotatesAtEachPeriodBoundary(t *testing.T) {
 		t.Parallel()
 
 		env := setupArchiveTest(t)
-		tgt := env.seedDatabaseTarget(t, `{"rotation":"`+rotationNone+`"}`)
+		tgt := env.seedDatabaseTarget(t, 0, rotationNone)
 
 		first := env.deliverReceivedAt(t, tgt, cases[0].before)
 		second := env.deliverReceivedAt(t, tgt, cases[0].after)
@@ -144,7 +140,7 @@ func TestWrite_EventWithoutReceiveTime(t *testing.T) {
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	tgt := env.seedDatabaseTarget(t, `{"rotation":"`+rotationMonthly+`"}`)
+	tgt := env.seedDatabaseTarget(t, 0, rotationMonthly)
 	path := env.archivePath(tgt)
 
 	before := time.Now().UTC().Format("2006-01")
@@ -169,13 +165,13 @@ func TestWrite_RotationChangeKeepsOldFiles(t *testing.T) {
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	tgt := env.seedDatabaseTarget(t, "")
+	tgt := env.seedDatabaseTarget(t, 0, rotationNone)
 	path := env.archivePath(tgt)
 	at := time.Date(2026, 3, 4, 12, 0, 0, 0, time.UTC)
 
 	first := env.deliverReceivedAt(t, tgt, at)
 
-	tgt.Config = dailyConfig
+	tgt.ArchiveRotation = rotationDaily
 	second := env.deliverReceivedAt(t, tgt, at)
 
 	assert.Equal(t, []string{first}, archivedEventIDs(t, path))
@@ -193,9 +189,7 @@ func TestArchiveSweep_PrunesEveryFile(t *testing.T) {
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	tgt := env.seedDatabaseTarget(
-		t, `{"expiry":"1h","rotation":"`+rotationDaily+`"}`,
-	)
+	tgt := env.seedDatabaseTarget(t, time.Hour, rotationDaily)
 	path := env.archivePath(tgt)
 	emptied := periodPath(path, dayPeriod)
 	kept := periodPath(path, nextDayPeriod)
@@ -225,13 +219,13 @@ func TestRename_MovesEveryFile(t *testing.T) {
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	tgt := env.seedDatabaseTarget(t, "")
+	tgt := env.seedDatabaseTarget(t, 0, rotationNone)
 	oldPath := env.archivePath(tgt)
 	day := time.Date(2026, 3, 4, 12, 0, 0, 0, time.UTC)
 
 	unrotated := env.deliverReceivedAt(t, tgt, day)
 
-	tgt.Config = dailyConfig
+	tgt.ArchiveRotation = rotationDaily
 	first := env.deliverReceivedAt(t, tgt, day)
 	second := env.deliverReceivedAt(t, tgt, day.Add(24*time.Hour))
 
@@ -267,7 +261,7 @@ func TestRename_NeverReplacesARotatedFile(t *testing.T) {
 	t.Parallel()
 
 	env := setupArchiveTest(t)
-	tgt := env.seedDatabaseTarget(t, dailyConfig)
+	tgt := env.seedDatabaseTarget(t, 0, rotationDaily)
 	oldPath := env.archivePath(tgt)
 	day := time.Date(2026, 3, 4, 12, 0, 0, 0, time.UTC)
 
@@ -341,34 +335,27 @@ func TestArchivePathAt(t *testing.T) {
 	at := time.Date(2026, 10, 1, 19, 30, 0, 0, time.UTC)
 
 	cases := map[string]string{
-		"":                                       "",
-		`{"rotation":"` + rotationNone + `"}`:    "",
-		`{"rotation":"` + rotationMonthly + `"}`: "-2026-10",
-		dailyConfig:                              "-2026-10-01",
-		`{"rotation":"` + rotationHourly + `"}`:  "-2026-10-01-19",
+		"":              "",
+		rotationNone:    "",
+		rotationMonthly: "-2026-10",
+		rotationDaily:   "-2026-10-01",
+		rotationHourly:  "-2026-10-01-19",
 	}
 
-	for config, period := range cases {
+	for rotation, period := range cases {
 		target := &database.Target{
-			BaseModel: database.BaseModel{ID: "tgt-id"},
-			Name:      "Archive",
-			Config:    config,
+			BaseModel:       database.BaseModel{ID: "tgt-id"},
+			Name:            "Archive",
+			ArchiveRotation: rotation,
 		}
 
-		got, err := archive.PathAt(dbMgr, webhook, target, at)
-		require.NoError(t, err, config)
 		assert.Equal(t,
 			filepath.Join(
 				dataDir, "archive-orders-archive-tgt-id"+period+".db",
 			),
-			got, config,
+			archive.PathAt(dbMgr, webhook, target, at), rotation,
 		)
 	}
-
-	_, err := archive.PathAt(dbMgr, webhook, &database.Target{
-		Config: weeklyConfig,
-	}, at)
-	require.Error(t, err)
 }
 
 // TestValidateArchiveRotation accepts the four rotations, and empty,

internal/archive/sweeper.go

@@ -199,22 +199,11 @@ func (s *Sweeper) sweep(ctx context.Context) {
 	}
 }
 
-// sweepTarget prunes the archive of a single database target.
-// A missing, empty, or "never" expiry parses as a zero duration
-// and is skipped entirely, so those archives are never pruned.
+// sweepTarget prunes the archive of a single database target. A
+// target with an ArchiveExpiry of 0 keeps its archive forever and is
+// skipped entirely, so that archive is never pruned.
 func (s *Sweeper) sweepTarget(target *database.Target) {
-	expiry, err := ParseExpiry(target.Config)
-	if err != nil {
-		s.log.Error(
-			"archive sweep: invalid database target config",
-			"webhook_id", target.WebhookID,
-			"target_id", target.ID,
-			"error", err,
-		)
-
-		return
-	}
-
+	expiry := target.ArchiveExpiry
 	if expiry <= 0 {
 		return
 	}
@@ -223,7 +212,7 @@ func (s *Sweeper) sweepTarget(target *database.Target) {
 		return
 	}
 
-	err = s.writers.sweepArchive(target.ID, expiry)
+	err := s.writers.sweepArchive(target.ID, expiry)
 	if err == nil {
 		return
 	}

internal/archive/sweeper_test.go

@@ -106,10 +106,10 @@ func (env *archiveEnv) archivePath(tgt *database.Target) string {
 	)
 }
 
-// seedDatabaseTarget creates a webhook with one database target
-// carrying the given target config JSON, and returns the target.
+// seedDatabaseTarget creates a webhook with one database target with
+// the given archive expiry and rotation, and returns the target.
 func (env *archiveEnv) seedDatabaseTarget(
-	t *testing.T, configJSON string,
+	t *testing.T, expiry time.Duration, rotation string,
 ) *database.Target {
 	t.Helper()
 
@@ -124,23 +124,27 @@ func (env *archiveEnv) seedDatabaseTarget(
 			Create(wh).Error,
 	)
 
-	return env.addDatabaseTarget(t, wh.ID, configJSON)
+	return env.addDatabaseTarget(t, wh.ID, expiry, rotation)
 }
 
 // addDatabaseTarget creates one more database target on an
 // existing webhook and returns it.
 func (env *archiveEnv) addDatabaseTarget(
-	t *testing.T, webhookID, configJSON string,
+	t *testing.T,
+	webhookID string,
+	expiry time.Duration,
+	rotation string,
 ) *database.Target {
 	t.Helper()
 
 	tgt := &database.Target{
-		WebhookID:   webhookID,
-		Name:        "Archive",
-		Type:        database.TargetTypeDatabase,
-		Active:      true,
-		Config:      configJSON,
-		MaxAttempts: 1,
+		WebhookID:       webhookID,
+		Name:            "Archive",
+		Type:            database.TargetTypeDatabase,
+		Active:          true,
+		ArchiveExpiry:   expiry,
+		ArchiveRotation: rotation,
+		MaxAttempts:     1,
 	}
 	require.NoError(
 		t,
@@ -323,7 +327,7 @@ func TestArchiveSweeper_LoopOutlivesStartHookContext(
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	tgt := env.seedDatabaseTarget(t, time.Hour, "")
 
 	now := time.Now()
 	path := env.seedArchiveRows(
@@ -377,7 +381,7 @@ func TestArchiveSweep_DoesNotResurrectEvictedWriter(
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	tgt := env.seedDatabaseTarget(t, time.Hour, "")
 	env.seedArchiveRows(
 		t, tgt, time.Now().Add(-48*time.Hour),
 	)
@@ -411,7 +415,7 @@ func TestArchiveSweep_LeavesNoRegistryEntry(t *testing.T) {
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	tgt := env.seedDatabaseTarget(t, time.Hour, "")
 	path := env.seedArchiveRows(
 		t, tgt,
 		time.Now().Add(-48*time.Hour),
@@ -444,7 +448,7 @@ func TestArchiveSweep_KeepsWriterAdoptedByDelivery(
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	tgt := env.seedDatabaseTarget(t, time.Hour, "")
 	env.seedArchiveRows(
 		t, tgt, time.Now().Add(-48*time.Hour),
 	)
@@ -498,7 +502,7 @@ func TestArchiveSweep_KeepsWriterAdoptedDuringSweep(
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	tgt := env.seedDatabaseTarget(t, time.Hour, "")
 	env.seedArchiveRows(
 		t, tgt, time.Now().Add(-48*time.Hour),
 	)
@@ -551,8 +555,8 @@ func TestArchiveSweep_KeepsWriterAdoptedDuringSweep(
 
 // TestArchiveSweep_ContinuesAfterPerTargetFailure proves a
 // failure for one target does not abort the sweep for the
-// others: an unparseable expiry and an unreadable archive both
-// have to be logged and stepped over.
+// others: an unreadable archive has to be logged and stepped
+// over.
 func TestArchiveSweep_ContinuesAfterPerTargetFailure(
 	t *testing.T,
 ) {
@@ -560,21 +564,16 @@ func TestArchiveSweep_ContinuesAfterPerTargetFailure(
 
 	env := setupArchiveTest(t)
 
-	// Seeded first so the sweep reaches them before the healthy
+	// Seeded first so the sweep reaches it before the healthy
 	// target: targets come back in insertion order.
-	badConfig := env.seedDatabaseTarget(t, `{"expiry":"!!!"}`)
-	env.seedArchiveRows(
-		t, badConfig, time.Now().Add(-48*time.Hour),
-	)
-
-	corrupt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	corrupt := env.seedDatabaseTarget(t, time.Hour, "")
 	require.NoError(t, os.WriteFile(
 		env.archivePath(corrupt),
 		[]byte("this is not a sqlite database"),
 		0o600,
 	))
 
-	healthy := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	healthy := env.seedDatabaseTarget(t, time.Hour, "")
 	healthyPath := env.seedArchiveRows(
 		t, healthy,
 		time.Now().Add(-48*time.Hour),
@@ -631,7 +630,7 @@ func TestArchiveSweep_PrunesIdleArchive(t *testing.T) {
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	tgt := env.seedDatabaseTarget(t, time.Hour, "")
 
 	now := time.Now()
 	path := env.seedArchiveRows(
@@ -670,7 +669,7 @@ func TestArchiveSweep_LeavesArchiveClosed(t *testing.T) {
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	tgt := env.seedDatabaseTarget(t, time.Hour, "")
 	path := env.seedArchiveRows(
 		t, tgt, time.Now().Add(-48*time.Hour),
 	)
@@ -710,7 +709,7 @@ func TestArchiveSweep_ClosesHandleOfRegisteredWriter(
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	tgt := env.seedDatabaseTarget(t, time.Hour, "")
 	env.seedArchiveRows(
 		t, tgt, time.Now().Add(-48*time.Hour),
 	)
@@ -795,36 +794,29 @@ func TestArchiveSweep_CancelledSweepLogsNoError(t *testing.T) {
 }
 
 // TestArchiveSweep_NeverExpiryUntouched proves the sweep is a
-// no-op for the default retention policy, so archives with no
-// expiry (or the literal "never") behave exactly as before.
+// no-op for the default retention policy, so an archive with an
+// expiry of 0, which keeps it forever, is left alone.
 func TestArchiveSweep_NeverExpiryUntouched(t *testing.T) {
 	t.Parallel()
 
-	for _, configJSON := range []string{
-		`{"expiry":"never"}`,
-		`{"expiry":""}`,
-		"",
-	} {
-		env := setupArchiveTest(t)
+	env := setupArchiveTest(t)
 
-		tgt := env.seedDatabaseTarget(t, configJSON)
-		path := env.seedArchiveRows(
-			t, tgt,
-			time.Now().Add(-10000*time.Hour),
-		)
+	tgt := env.seedDatabaseTarget(t, 0, "")
+	path := env.seedArchiveRows(
+		t, tgt,
+		time.Now().Add(-10000*time.Hour),
+	)
 
-		env.sweeper.ExportSweep(context.Background())
+	env.sweeper.ExportSweep(context.Background())
 
-		assert.Equal(
-			t, []string{sweepRowOld}, archivedEventIDs(t, path),
-			"config %q must keep rows forever", configJSON,
-		)
-		assert.False(
-			t, env.writers.ExportHasArchiveWriter(tgt.ID),
-			"config %q must leave no registry entry behind",
-			configJSON,
-		)
-	}
+	assert.Equal(
+		t, []string{sweepRowOld}, archivedEventIDs(t, path),
+		"an expiry of 0 must keep rows forever",
+	)
+	assert.False(
+		t, env.writers.ExportHasArchiveWriter(tgt.ID),
+		"an expiry of 0 must leave no registry entry behind",
+	)
 }
 
 // TestArchiveSweep_NeverExpirySkipsBeforeOpening pins the
@@ -845,7 +837,7 @@ func TestArchiveSweep_NeverExpirySkipsBeforeOpening(
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"never"}`)
+	tgt := env.seedDatabaseTarget(t, 0, "")
 	path := env.archivePath(tgt)
 
 	seedUnmigratedArchive(t, path)
@@ -897,7 +889,7 @@ func TestArchiveSweep_DoesNotCreateArchiveFile(t *testing.T) {
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	tgt := env.seedDatabaseTarget(t, time.Hour, "")
 	path := env.archivePath(tgt)
 
 	require.NoFileExists(t, path)
@@ -928,7 +920,7 @@ func TestArchiveSweep_DoesNotCreateAfterWriterExists(
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	tgt := env.seedDatabaseTarget(t, time.Hour, "")
 
 	path, err := env.writers.ExportEnsureArchiveWriter(tgt.ID)
 	require.NoError(t, err)
@@ -947,7 +939,7 @@ func TestArchiveSweep_SkipsDeletedWebhookTargets(t *testing.T) {
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	tgt := env.seedDatabaseTarget(t, time.Hour, "")
 	path := env.seedArchiveRows(
 		t, tgt, time.Now().Add(-48*time.Hour),
 	)
@@ -975,7 +967,7 @@ func TestArchiveSweep_ConcurrentWrites(t *testing.T) {
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	tgt := env.seedDatabaseTarget(t, time.Hour, "")
 
 	deliveries := make(
 		[]*database.Delivery, 0, sweepConcurrentWrites,
@@ -1020,7 +1012,7 @@ func TestArchiveSweeper_StopsCleanly(t *testing.T) {
 
 	env := setupArchiveTest(t)
 
-	tgt := env.seedDatabaseTarget(t, `{"expiry":"1h"}`)
+	tgt := env.seedDatabaseTarget(t, time.Hour, "")
 	env.seedArchiveRows(
 		t, tgt, time.Now().Add(-48*time.Hour),
 	)

internal/archive/writer.go

@@ -1,7 +1,6 @@
 package archive
 
 import (
-	"encoding/json"
 	"errors"
 	"fmt"
 	"io/fs"
@@ -18,8 +17,9 @@ import (
 	"sneak.berlin/go/webhooker/internal/gormlog"
 )
 
-// ExpiryNever is the expiry sentinel (and default) that
-// disables pruning so archived rows are kept forever.
+// ExpiryNever is the archive expiry, as the target forms take it,
+// that disables pruning so archived rows are kept forever. It is
+// stored as an ArchiveExpiry of 0.
 const ExpiryNever = "never"
 
 // archiveReopenDebounce bounds how often an archive file is
@@ -79,19 +79,6 @@ var (
 	)
 )
 
-// DatabaseTargetConfig is the optional per-target JSON config
-// for a database (archive) target.
-type DatabaseTargetConfig struct {
-	// Expiry is a Go duration (e.g. "720h") after which
-	// archived rows are pruned, or "never" (the default) to
-	// keep them forever.
-	Expiry string `json:"expiry"`
-
-	// Rotation is none (the default), monthly, daily or hourly: see
-	// archivePeriod.
-	Rotation string `json:"rotation"`
-}
-
 // archivedEvent is one fully captured webhook event stored in a
 // database target's archive for long-term retention. It is a
 // self-contained copy — independent of the per-webhook event
@@ -112,63 +99,20 @@ type archivedEvent struct {
 	ArchivedAt time.Time `gorm:"index"`
 }
 
-// ParseExpiry reads the optional expiry from a database
-// target's config JSON. An empty config, an empty expiry, or
-// the literal "never" all mean keep forever, returned as a zero
-// duration. Any other value must parse as a positive Go
-// duration; a set-but-invalid value (unparseable, zero, or
-// negative) is an error rather than a silent default, matching
-// ValidateExpiry at target creation.
-func ParseExpiry(
-	configJSON string,
-) (time.Duration, error) {
-	if configJSON == "" {
-		return 0, nil
-	}
-
-	var cfg DatabaseTargetConfig
-
-	err := json.Unmarshal([]byte(configJSON), &cfg)
-	if err != nil {
-		return 0, fmt.Errorf(
-			"parsing database target config: %w", err,
-		)
-	}
-
-	if cfg.Expiry == "" || cfg.Expiry == ExpiryNever {
-		return 0, nil
-	}
-
-	dur, err := time.ParseDuration(cfg.Expiry)
-	if err != nil {
-		return 0, fmt.Errorf(
-			"parsing archive expiry %q: %w", cfg.Expiry, err,
-		)
-	}
-
-	if dur <= 0 {
-		return 0, fmt.Errorf(
-			"%w: %q", errArchiveExpiryNotPositive, cfg.Expiry,
-		)
-	}
-
-	return dur, nil
-}
-
-// ValidateExpiry checks a user-supplied archive expiry
-// for a database target at configuration time. Valid values are
-// empty, "never" (both meaning keep forever), or a positive Go
-// duration such as "720h". Anything else is an error, so a bad
-// expiry is rejected when the target is created rather than
-// failing every subsequent delivery.
-func ValidateExpiry(expiry string) error {
+// ParseExpiry reads a user-supplied archive expiry for a database
+// target, as the target forms submit it, into the ArchiveExpiry the
+// target stores. Empty and "never" both mean keep forever, which is
+// 0; anything else must be a positive Go duration such as "720h". Any
+// other value is an error, so a bad expiry is refused at the form
+// rather than stored.
+func ParseExpiry(expiry string) (time.Duration, error) {
 	if expiry == "" || expiry == ExpiryNever {
-		return nil
+		return 0, nil
 	}
 
 	dur, err := time.ParseDuration(expiry)
 	if err != nil {
-		return fmt.Errorf(
+		return 0, fmt.Errorf(
 			"expiry must be %q or a Go duration "+
 				"such as \"720h\": %w",
 			ExpiryNever, err,
@@ -176,12 +120,12 @@ func ValidateExpiry(expiry string) error {
 	}
 
 	if dur <= 0 {
-		return fmt.Errorf(
+		return 0, fmt.Errorf(
 			"%w: %q", errArchiveExpiryNotPositive, expiry,
 		)
 	}
 
-	return nil
+	return dur, nil
 }
 
 // archiveWriter owns one database target's archive SQLite files.