Name each embedded static file so a missing Alpine.js fails the build (closes #166)

static/static.go embedded the css and js directories, which match
whatever is present, so a build that skipped make assets produced a
binary whose pages had no Alpine.js. It now names the four files the
pages load, so a missing one is a compile error naming it.
css/input.css, the Tailwind source that no page loads, is no longer
embedded or served.

Both lint stages now extract Alpine.js before linting, since the
static package no longer compiles without it.

Model: opus-5-5

README.md

@@ -2033,6 +2033,29 @@ Because each `database` target has its own archive file, a target's
 webhook with different expiries keep two archives, each pruned on its
 own schedule.
 
+Each `database` target on the webhook page has a **Download** button,
+which returns its archive as one gzipped JSON file,
+`archive-{webhook_name}-{target_name}-{YYYYMMDDTHHMMSSZ}.json.gz`, the
+names made safe as above and the time in UTC. The file holds one
+object: `webhook` and `target`, each an `id` and a `name`;
+`exported_at`; and `archived_events`, one object per archived row with
+every column, keyed by column name. A body that is not valid UTF-8 is
+written in base64, with `"body_encoding": "base64"` beside it. An
+archive that does not exist yet, or was moved away, downloads with an
+empty `archived_events`; the download never creates the file.
+
+The download streams: each row is read and written out compressed
+before the next is read, so neither the archive nor the JSON is held in
+memory. It reads on a connection of its own, inside one read-only
+transaction, so the file holds the archive as it stood when the
+download started, and archive writes go on meanwhile, since under WAL a
+reader never blocks a writer. While it runs, the `-wal` cannot be
+checkpointed past what it reads, so a long download lets the `-wal`
+grow. It finds the file by the stored names under the lock that webhook
+edits, target edits and target creation hold, and lets go once the file
+is open: a rename during the download moves the file without affecting
+it.
+
 Deleting a webhook releases its archives: the delivery engine's cached
 archive writers are dropped and their file handles closed, so nothing
 lingers after the webhook is gone. The archive **files themselves are
@@ -2611,11 +2634,10 @@ on all three arms of `Trace`, including the routine one an operator
 reaches at `DEBUG`, which is the only level at which a successful
 `INSERT` is written at all. One GORM path does not consult the filter —
 `(*gorm.DB).Scan`, which records the statement through GORM's own trace
-recorder. No production code path calls it; its one caller is
-`internal/database/database_test.go:91`, whose `SELECT 1` binds
-nothing, and `internal/gormlog/scan_guard_test.go` fails if a non-test
-file calls it. `Pluck`, `Row` and `Raw` all run through the normal
-callback processor and are filtered.
+recorder. No production code path calls it; only tests do, and what a
+test binds is fixture data. `internal/gormlog/scan_guard_test.go` fails
+if a non-test file calls it. `Pluck`, `Row` and `Raw` all run through
+the normal callback processor and are filtered.
 See `#### What DEBUG=true exposes` under Configuration.
 
 What that ceiling does **not** cover, stated here so the figure is not
@@ -2900,6 +2922,7 @@ returns to the page that was asked for.
 | `POST` | `/hook/{id}/targets`     | Add target to webhook |
 | `GET`  | `/hook/{id}/targets/{targetID}/edit` | Edit target form. The one page that renders a target's destination URL and header values in full, rather than masked |
 | `POST` | `/hook/{id}/targets/{targetID}/edit` | Edit target submission |
+| `GET`  | `/hook/{id}/targets/{targetID}/download` | Download a `database` target's archive as one gzipped JSON file. See [Database Architecture](#database-architecture) |
 | `POST` | `/hook/{id}/targets/{targetID}/delete` | Delete a target |
 | `POST` | `/hook/{id}/targets/{targetID}/toggle` | Enable or disable a target |
 
@@ -2981,6 +3004,7 @@ webhooker/
 │   │   ├── target_slack.go    # Slack/Mattermost incoming-webhook target
 │   │   ├── target_database.go # Database archive target
 │   │   ├── target_database_archive.go  # Archive file lifecycle and pruning
+│   │   ├── target_database_export.go   # Archive download as gzipped JSON
 │   │   ├── target_log.go      # Log target (stdout)
 │   │   ├── target_config_view.go  # Masked target config for templates
 │   │   ├── archive_sweeper.go # Periodic pruning of idle archives
@@ -3247,9 +3271,9 @@ each hook. The order, read off the fx stop-hook log:
 
 1. `ArchiveSweeper`
 2. `RetentionReaper`
-3. `server` — the HTTP drain, bounded separately by
-   `server.ShutdownTimeout` (**3 seconds**), then a Sentry flush if
-   `SENTRY_DSN` is set
+3. `server` — the HTTP drain, bounded by `server.ShutdownTimeout`
+   (**3 seconds**) and by what the hooks before it left, then a Sentry
+   flush if `SENTRY_DSN` is set
 4. `delivery.Engine` — waits for its workers, then closes the archive
    databases
 5. `healthcheck`
@@ -3269,23 +3293,30 @@ exhaust the sequence budget at the instant it finished, and every
 later hook — the delivery engine, the healthcheck, the webhook DB
 manager and the database close — would be skipped in exactly the
 case where the drain mattered. 3 seconds leaves 2 seconds
-(`server.TailHookReserve`) for the tail, which is far more than the
-microseconds it needs.
+(`server.TailHookReserve`) for the tail. The reserve is that
+remainder, not a figure sized to the tail, which takes about a
+millisecond.
 
 That reserve belongs to the tail hooks, not to the server hook, and
-the Sentry flush is what could take it: it runs after the drain
-**inside the same hook**, and `sentry.Flush` takes a bare duration
-and honours no context, so an unreachable Sentry endpoint would add
-its own timeout on top of a full-length drain and consume the whole
-sequence budget by itself. It is therefore clamped to whatever is
-left on the stop context minus the reserve, and skipped when that
-leaves too little to be worth attempting — so a full-length drain
-means Sentry events are dropped rather than the database close being
-skipped.
+the server hook could take it in two ways. The hooks before it may
+already have spent part of the budget, so a full 3-second drain
+would come out of the reserve; the drain is therefore also bounded
+by whatever is left on the stop context minus the reserve. And the
+Sentry flush runs after the drain **inside the same hook**, and
+`sentry.Flush` takes a bare duration and honours no context, so an
+unreachable Sentry endpoint would add its own timeout on top of a
+full-length drain and consume the whole sequence budget by itself.
+It is clamped the same way, and skipped when that leaves too little
+to be worth attempting — so a full-length drain means Sentry events
+are dropped rather than the database close being skipped.
 
-This does not make the database close unconditional: a wedged
-`ArchiveSweeper` or `RetentionReaper` still runs first and can
-consume the whole budget on its own.
+This does not make the database close unconditional. A slow
+`ArchiveSweeper` or `RetentionReaper` is enough to cut the shutdown
+short, not only one that consumes the whole budget: what they spend
+comes out of the drain first, so after 2 seconds of theirs a request
+still in flight gets 1 second to finish, and after 3 it gets none.
+Past 3 seconds they spend the reserve itself, and one that takes the
+whole budget skips every hook after it, the database close included.
 
 The value is chosen to sit inside the container stop grace period.
 Docker's default `docker stop` grace is 10 seconds and the Dockerfile
@@ -3350,8 +3381,9 @@ version is fixed independently of the compiler's:
 
 1. **Lint stage** (`golangci/golangci-lint:v2.12.2`, Debian-based) —
    installs `make`, downloads dependencies, copies the source, and runs
-   `make fmt-check`, then `golangci-lint config verify` and
-   `golangci-lint run`, both with `--network=none`.
+   `make fmt-check`, then `script/assets` to extract Alpine.js from
+   `3p/`, then `golangci-lint config verify` and `golangci-lint run`,
+   both with `--network=none`.
 2. **Builder stage** (`golang:1.26.1-bookworm`) — depends on the lint
    stage passing (it copies a file from it), runs `make test` and
    `make build` (both extract Alpine.js from `3p/` first), and finally

cmd/webhooker/main.go

@@ -38,17 +38,19 @@ import (
 // hook that used the whole budget would exhaust it at that instant,
 // and fx would skip every hook after the server — the delivery
 // engine, the healthcheck, the webhook DB manager and the database
-// close. That hook is the 3s HTTP drain plus the Sentry flush that
-// follows it in the same hook, so the flush is clamped to the stop
+// close. That hook is the HTTP drain plus the Sentry flush that
+// follows it in the same hook, and each is clamped to the stop
 // context's remaining time less server.TailHookReserve rather than
-// running for its own fixed 2s; the reserve is what the tail hooks
-// live on, and they are microsecond-scale in normal operation.
+// running for its own fixed 3s and 2s; the reserve is what the tail
+// hooks live on, and they are microsecond-scale in normal operation.
 // TestStopTimeout_LeavesHeadroomForTailHooks pins the arithmetic
-// across every drain length.
+// across every drain length and every amount of budget the hooks
+// before the server may already have spent.
 //
 // This does not make the database close unconditional: the
-// ArchiveSweeper and RetentionReaper hooks run before the server
-// and can still consume the whole budget on their own.
+// ArchiveSweeper and RetentionReaper hooks run before the server.
+// What they spend comes out of the drain first, but past 3s it comes
+// out of the reserve, and they can consume the whole budget.
 const stopTimeout = 5 * time.Second
 
 // exitUsage is the status for a command line this binary cannot make

cmd/webhooker/main_test.go

@@ -252,22 +252,40 @@ const tailHeadroom = 2 * time.Second
 // can produce, since a shorter drain leaves the flush more room and
 // the worst case is not necessarily at either extreme.
 //
-// Shrinking either budget, or unbounding the flush again, must fail
-// here rather than silently recreating a hook that swallows the
-// whole sequence.
+// Nor does the hook start on a full budget: the ArchiveSweeper and
+// RetentionReaper hooks run before it, and whatever they spent is
+// gone. The outer sweep walks every amount they can spend. Once they
+// have eaten into the headroom themselves, the hook must spend
+// nothing of what is left. A drain that starts on the full budget
+// must still get all of ShutdownTimeout, so a smaller stopTimeout
+// cannot silently shorten every drain.
+//
+// Shrinking either budget, or unbounding the drain or the flush
+// again, must fail here rather than silently recreating a hook that
+// swallows the whole sequence.
 func TestStopTimeout_LeavesHeadroomForTailHooks(t *testing.T) {
 	t.Parallel()
 
 	require.Less(t, server.ShutdownTimeout, stopTimeout)
+	require.Equal(
+		t, server.ShutdownTimeout, server.DrainBudget(stopTimeout),
+		"a drain that starts on the full stop budget is cut short",
+	)
 
 	const step = 10 * time.Millisecond
 
-	for drain := time.Duration(0); drain <= server.ShutdownTimeout; drain += step {
-		hook := drain + server.SentryFlushBudget(stopTimeout-drain)
+	for spent := time.Duration(0); spent <= stopTimeout; spent += step {
+		remaining := stopTimeout - spent
+		longest := max(server.DrainBudget(remaining), 0)
 
-		require.LessOrEqual(
-			t, hook+tailHeadroom, stopTimeout,
-			"a %s drain leaves the tail hooks short", drain,
-		)
+		for drain := time.Duration(0); drain <= longest; drain += step {
+			hook := drain + server.SentryFlushBudget(remaining-drain)
+
+			require.GreaterOrEqual(
+				t, remaining-hook, min(remaining, tailHeadroom),
+				"a %s drain after %s of earlier hooks leaves "+
+					"the tail hooks short", drain, spent,
+			)
+		}
 	}
 }

internal/delivery/archive_sweeper_test.go

@@ -22,6 +22,7 @@ import (
 	_ "modernc.org/sqlite" // Pure Go SQLite driver.
 	"sneak.berlin/go/webhooker/internal/database"
 	"sneak.berlin/go/webhooker/internal/delivery"
+	"sneak.berlin/go/webhooker/internal/gormlog"
 )
 
 const (
@@ -70,7 +71,8 @@ func setupArchiveTest(t *testing.T) *archiveEnv {
 	t.Cleanup(func() { _ = sqlDB.Close() })
 
 	gdb, err := gorm.Open(
-		sqlite.Dialector{Conn: sqlDB}, &gorm.Config{},
+		sqlite.Dialector{Conn: sqlDB},
+		&gorm.Config{Logger: gormlog.New(slog.New(slog.DiscardHandler))},
 	)
 	require.NoError(t, err)
 
@@ -168,7 +170,8 @@ func (env *archiveEnv) seedArchiveRows(
 	require.NoError(t, err)
 
 	gdb, err := gorm.Open(
-		sqlite.Dialector{Conn: sqlDB}, &gorm.Config{},
+		sqlite.Dialector{Conn: sqlDB},
+		&gorm.Config{Logger: gormlog.New(slog.New(slog.DiscardHandler))},
 	)
 	require.NoError(t, err)
 
@@ -227,7 +230,8 @@ func countArchivedRows(path string) (int64, error) {
 	defer func() { _ = sqlDB.Close() }()
 
 	gdb, err := gorm.Open(
-		sqlite.Dialector{Conn: sqlDB}, &gorm.Config{},
+		sqlite.Dialector{Conn: sqlDB},
+		&gorm.Config{Logger: gormlog.New(slog.New(slog.DiscardHandler))},
 	)
 	if err != nil {
 		return 0, err

internal/delivery/engine_integration_test.go

@@ -23,6 +23,7 @@ import (
 	_ "modernc.org/sqlite"
 	"sneak.berlin/go/webhooker/internal/database"
 	"sneak.berlin/go/webhooker/internal/delivery"
+	"sneak.berlin/go/webhooker/internal/gormlog"
 )
 
 // iSetup holds common integration test dependencies.
@@ -80,7 +81,8 @@ func iMainDB(t *testing.T) *gorm.DB {
 	t.Cleanup(func() { _ = sqlDB.Close() })
 
 	db, err := gorm.Open(
-		sqlite.Dialector{Conn: sqlDB}, &gorm.Config{},
+		sqlite.Dialector{Conn: sqlDB},
+		&gorm.Config{Logger: gormlog.New(slog.New(slog.DiscardHandler))},
 	)
 	require.NoError(t, err)
 

internal/delivery/engine_test.go

@@ -26,6 +26,7 @@ import (
 	_ "modernc.org/sqlite"
 	"sneak.berlin/go/webhooker/internal/database"
 	"sneak.berlin/go/webhooker/internal/delivery"
+	"sneak.berlin/go/webhooker/internal/gormlog"
 	"sneak.berlin/go/webhooker/internal/metrics"
 )
 
@@ -50,7 +51,8 @@ func testWebhookDB(t *testing.T) *gorm.DB {
 	t.Cleanup(func() { _ = sqlDB.Close() })
 
 	db, err := gorm.Open(
-		sqlite.Dialector{Conn: sqlDB}, &gorm.Config{},
+		sqlite.Dialector{Conn: sqlDB},
+		&gorm.Config{Logger: gormlog.New(slog.New(slog.DiscardHandler))},
 	)
 	require.NoError(t, err)
 

internal/delivery/target_database.go

@@ -3,7 +3,6 @@ package delivery
 import (
 	"context"
 	"fmt"
-	"path/filepath"
 	"strings"
 	"sync"
 	"time"
@@ -277,10 +276,9 @@ func (t *databaseTarget) releaseSweepWriter(
 }
 
 // newWriter builds the writer for a database target's archive. The
-// file lives beside the webhook's event database in the data
-// directory and is named for the webhook and the target as the main
-// database has them now; from then on only rename changes the name
-// the writer uses. It does not touch the archive file.
+// file is the one ArchivePath gives for the webhook and the target as
+// the main database names them now; from then on only rename changes
+// the name the writer uses. It does not touch the archive file.
 func (t *databaseTarget) newWriter(
 	targetID string,
 ) (*archiveWriter, error) {
@@ -299,12 +297,10 @@ func (t *databaseTarget) newWriter(
 		)
 	}
 
-	dir := filepath.Dir(t.eng.dbManager.DBPath(target.WebhookID))
-	name := ArchiveFileName(
-		target.Webhook.Name, target.Name, target.ID,
+	w := newArchiveWriter(
+		ArchivePath(t.eng.dbManager, &target.Webhook, &target),
+		t.eng.log,
 	)
-
-	w := newArchiveWriter(filepath.Join(dir, name), t.eng.log)
 	w.webhookID = target.WebhookID
 
 	return w, nil

internal/delivery/target_database_export.go

@@ -0,0 +1,275 @@
+package delivery
+
+import (
+	"compress/gzip"
+	"context"
+	"database/sql"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log/slog"
+	"path/filepath"
+	"time"
+	"unicode/utf8"
+
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+	"sneak.berlin/go/webhooker/internal/database"
+	"sneak.berlin/go/webhooker/internal/gormlog"
+)
+
+// archiveTableQuery counts the archive's table: 0 when the archive
+// writer has created the file but not yet the table in it.
+const archiveTableQuery = "SELECT count(*) FROM sqlite_master " +
+	"WHERE type = 'table' AND name = 'archived_events'"
+
+// ArchivePath returns where a database target's archive file is: in
+// the data directory, beside the webhook's event database, under the
+// name ArchiveFileName gives it.
+func ArchivePath(
+	dbMgr *database.WebhookDBManager,
+	webhook *database.Webhook,
+	target *database.Target,
+) string {
+	return filepath.Join(
+		filepath.Dir(dbMgr.DBPath(webhook.ID)),
+		ArchiveFileName(webhook.Name, target.Name, target.ID),
+	)
+}
+
+// ArchiveExportFileName returns the name a database target's archive
+// downloads under:
+// archive-WEBHOOKNAME-TARGETNAME-YYYYMMDDTHHMMSSZ.json.gz, the names
+// made safe as in ArchiveFileName and the time in UTC.
+func ArchiveExportFileName(
+	webhookName, targetName string, at time.Time,
+) string {
+	return "archive-" + archiveNamePart(webhookName) + "-" +
+		archiveNamePart(targetName) + "-" +
+		at.UTC().Format("20060102T150405Z") + ".json.gz"
+}
+
+// ArchiveExport is a database target's archive opened for download.
+// It reads the file on its own connection, inside one read-only
+// transaction, so it writes out the archive as it stood when
+// OpenArchiveExport returned.
+//
+// Archives are in WAL mode, where a reader works from a snapshot and
+// never blocks a writer: archive writes go on while an export is open,
+// and the export does not see them. SQLite cannot checkpoint the -wal
+// past an open snapshot, so the -wal grows until the export is closed.
+type ArchiveExport struct {
+	db *sql.DB
+	tx *gorm.DB
+
+	// empty is true when there is nothing to read: no file, or a file
+	// without the archive's table yet.
+	empty bool
+}
+
+// exportedName is how an export names its webhook and its target.
+type exportedName struct {
+	ID   string `json:"id"`
+	Name string `json:"name"`
+}
+
+// OpenArchiveExport opens the archive file at path for export and
+// takes the snapshot the export reads. It never creates the file: with
+// no file at path, the export has no rows.
+//
+// Once it has returned, the file is open, so a rename or a move of it
+// does not affect the export, which reads the same file under its new
+// name.
+//
+// The transaction lasts as long as ctx does, so ctx must last for the
+// whole export.
+func OpenArchiveExport(
+	ctx context.Context, path string, log *slog.Logger,
+) (*ArchiveExport, error) {
+	if !fileExists(path) {
+		return &ArchiveExport{empty: true}, nil
+	}
+
+	db, err := database.OpenSQLite(path, archiveModeExisting)
+	if err != nil {
+		return nil, fmt.Errorf("opening archive %s: %w", path, err)
+	}
+
+	gdb, err := gorm.Open(
+		sqlite.Dialector{Conn: db}, &gorm.Config{
+			// Never leave this at GORM's default. See
+			// internal/gormlog.
+			Logger: gormlog.New(log),
+		},
+	)
+	if err != nil {
+		_ = db.Close()
+
+		return nil, fmt.Errorf("opening archive %s: %w", path, err)
+	}
+
+	// ReadOnly makes the driver begin a deferred transaction in place
+	// of the BEGIN IMMEDIATE the connection string asks for, so the
+	// export never takes the archive's write lock.
+	tx := gdb.WithContext(ctx).Begin(&sql.TxOptions{ReadOnly: true})
+	if tx.Error != nil {
+		_ = db.Close()
+
+		return nil, fmt.Errorf("reading archive %s: %w", path, tx.Error)
+	}
+
+	// The transaction's first read is what takes the snapshot.
+	var tables int
+
+	err = tx.Raw(archiveTableQuery).Row().Scan(&tables)
+	if err != nil {
+		_ = tx.Rollback()
+		_ = db.Close()
+
+		return nil, fmt.Errorf("reading archive %s: %w", path, err)
+	}
+
+	return &ArchiveExport{db: db, tx: tx, empty: tables == 0}, nil
+}
+
+// WriteGzipJSON writes the export to w as one gzipped JSON object:
+// webhook and target, each an id and a name; exported_at; and
+// archived_events, one object per archived row, keyed by column name.
+// A body that is not valid UTF-8 cannot be a JSON string, so it is
+// written in base64, with "body_encoding": "base64" beside it.
+//
+// Each row is written out before the next is read, so neither the
+// archive nor its JSON is ever held in memory whole. After an error
+// the gzip stream is left unfinished, so what was written does not
+// decompress as a whole file.
+func (x *ArchiveExport) WriteGzipJSON(
+	ctx context.Context,
+	w io.Writer,
+	webhook *database.Webhook,
+	target *database.Target,
+	exportedAt time.Time,
+) error {
+	head, err := json.Marshal(map[string]any{
+		"webhook":     exportedName{ID: webhook.ID, Name: webhook.Name},
+		"target":      exportedName{ID: target.ID, Name: target.Name},
+		"exported_at": exportedAt.UTC(),
+	})
+	if err != nil {
+		return fmt.Errorf("encoding archive export: %w", err)
+	}
+
+	zw := gzip.NewWriter(w)
+
+	err = x.writeJSON(ctx, zw, head)
+	if err != nil {
+		return fmt.Errorf("writing archive export: %w", err)
+	}
+
+	return zw.Close()
+}
+
+// Close ends the export's transaction and closes its connection.
+func (x *ArchiveExport) Close() error {
+	if x.db == nil {
+		return nil
+	}
+
+	_ = x.tx.Rollback()
+
+	return x.db.Close()
+}
+
+// writeJSON writes head with archived_events added as its last key,
+// the rows going into it one at a time.
+func (x *ArchiveExport) writeJSON(
+	ctx context.Context, w io.Writer, head []byte,
+) error {
+	// head goes out without its closing brace, so that
+	// archived_events can follow it.
+	_, err := w.Write(head[:len(head)-1])
+	if err != nil {
+		return err
+	}
+
+	_, err = io.WriteString(w, `,"archived_events":[`)
+	if err != nil {
+		return err
+	}
+
+	err = x.writeRows(ctx, w)
+	if err != nil {
+		return err
+	}
+
+	_, err = io.WriteString(w, "\n]}\n")
+
+	return err
+}
+
+// writeRows writes each archived row to w, oldest first, one per line,
+// separated by commas.
+func (x *ArchiveExport) writeRows(ctx context.Context, w io.Writer) error {
+	if x.empty {
+		return nil
+	}
+
+	rows, err := x.tx.WithContext(ctx).
+		Model(&archivedEvent{}).Order("id").Rows()
+	if err != nil {
+		return err
+	}
+
+	defer func() { _ = rows.Close() }()
+
+	for sep := "\n"; rows.Next(); sep = ",\n" {
+		var ev archivedEvent
+
+		err = x.tx.ScanRows(rows, &ev)
+		if err != nil {
+			return err
+		}
+
+		_, err = io.WriteString(w, sep)
+		if err != nil {
+			return err
+		}
+
+		err = writeRow(w, &ev)
+		if err != nil {
+			return err
+		}
+	}
+
+	return rows.Err()
+}
+
+// writeRow writes an archived row to w as a JSON object keyed by
+// column name, its body in base64 when it is not valid UTF-8.
+func writeRow(w io.Writer, ev *archivedEvent) error {
+	row := map[string]any{
+		"id":            ev.ID,
+		"event_id":      ev.EventID,
+		"webhook_id":    ev.WebhookID,
+		"entrypoint_id": ev.EntrypointID,
+		"method":        ev.Method,
+		"headers":       ev.Headers,
+		"body":          ev.Body,
+		"content_type":  ev.ContentType,
+		"archived_at":   ev.ArchivedAt.UTC(),
+	}
+
+	if !utf8.ValidString(ev.Body) {
+		row["body"] = base64.StdEncoding.EncodeToString([]byte(ev.Body))
+		row["body_encoding"] = "base64"
+	}
+
+	line, err := json.Marshal(row)
+	if err != nil {
+		return err
+	}
+
+	_, err = w.Write(line)
+
+	return err
+}

internal/delivery/target_database_export_test.go

@@ -0,0 +1,412 @@
+package delivery_test
+
+import (
+	"bufio"
+	"bytes"
+	"compress/gzip"
+	"crypto/rand"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"runtime"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"sneak.berlin/go/webhooker/internal/database"
+	"sneak.berlin/go/webhooker/internal/delivery"
+)
+
+// The webhook and the target the export tests' archives belong to.
+const (
+	exportWebhookID   = "wh-export"
+	exportWebhookName = "Orders (EU)"
+	exportTargetID    = "tgt-export"
+	exportTargetName  = "Long-term archive"
+)
+
+const (
+	// binaryBody is a body that is not valid UTF-8.
+	binaryBody = "\xff\xfe\x00\x01binary\x80"
+
+	// openedEventID is the event the snapshot tests archive before
+	// they open the export.
+	openedEventID = "opened"
+)
+
+// writeExportTo writes export to w as the archive of the export tests'
+// webhook and target, exported at 2026-10-02T12:03:04Z.
+func writeExportTo(
+	t *testing.T, export *delivery.ArchiveExport, w io.Writer,
+) error {
+	t.Helper()
+
+	return export.WriteGzipJSON(
+		t.Context(), w,
+		&database.Webhook{
+			BaseModel: database.BaseModel{ID: exportWebhookID},
+			Name:      exportWebhookName,
+		},
+		&database.Target{
+			BaseModel: database.BaseModel{ID: exportTargetID},
+			Name:      exportTargetName,
+		},
+		time.Date(2026, 10, 2, 12, 3, 4, 0, time.UTC),
+	)
+}
+
+// exportArchive runs a whole export of the archive at path and returns
+// its JSON, decompressed and parsed.
+func exportArchive(t *testing.T, path string) map[string]any {
+	t.Helper()
+
+	export, err := delivery.OpenArchiveExport(
+		t.Context(), path, archiveTestLogger(),
+	)
+	require.NoError(t, err)
+
+	defer func() { require.NoError(t, export.Close()) }()
+
+	return writeExport(t, export)
+}
+
+// writeExport writes an opened export and returns its JSON,
+// decompressed and parsed. Reading to the end makes the gzip reader
+// check that the stream was finished.
+func writeExport(
+	t *testing.T, export *delivery.ArchiveExport,
+) map[string]any {
+	t.Helper()
+
+	var buf bytes.Buffer
+
+	require.NoError(t, writeExportTo(t, export, &buf))
+
+	zr, err := gzip.NewReader(&buf)
+	require.NoError(t, err)
+
+	raw, err := io.ReadAll(zr)
+	require.NoError(t, err)
+
+	var got map[string]any
+
+	require.NoError(t, json.Unmarshal(raw, &got))
+
+	return got
+}
+
+// exportedEvents returns an export's archived_events.
+func exportedEvents(t *testing.T, got map[string]any) []map[string]any {
+	t.Helper()
+
+	list, ok := got["archived_events"].([]any)
+	require.True(t, ok, "archived_events must be an array: %v", got)
+
+	events := make([]map[string]any, len(list))
+
+	for i, v := range list {
+		events[i], ok = v.(map[string]any)
+		require.True(t, ok, "an archived event must be an object: %v", v)
+	}
+
+	return events
+}
+
+// exportedEventIDs returns the event_id of each of an export's
+// archived_events.
+func exportedEventIDs(t *testing.T, got map[string]any) []string {
+	t.Helper()
+
+	events := exportedEvents(t, got)
+	ids := make([]string, 0, len(events))
+
+	for _, ev := range events {
+		ids = append(ids, fmt.Sprint(ev["event_id"]))
+	}
+
+	return ids
+}
+
+// TestArchiveExport_MatchesStoredRows proves an export holds the
+// webhook, the target, the time, and every column of every stored
+// row: a body that is valid UTF-8 as a string, and one that is not in
+// base64, marked as such.
+func TestArchiveExport_MatchesStoredRows(t *testing.T) {
+	t.Parallel()
+
+	path := filepath.Join(t.TempDir(), "archive.db")
+	w := delivery.NewExportArchiveWriter(path, archiveTestLogger(), 0)
+	bodies := []string{`{"order":1}`, "plain text", "", binaryBody}
+
+	for i, body := range bodies {
+		require.NoError(t, w.Write(delivery.ExportArchivedEvent{
+			EventID:      fmt.Sprintf("ev-%d", i),
+			WebhookID:    exportWebhookID,
+			EntrypointID: "ep-1",
+			Method:       "POST",
+			Headers:      `{"X-Test":["yes"]}`,
+			Body:         body,
+			ContentType:  testContentType,
+		}, 0))
+	}
+
+	var stored []delivery.ExportArchivedEvent
+
+	require.NoError(t, openArchiveDBForRead(t, path).
+		Order("id").Find(&stored).Error)
+
+	got := exportArchive(t, path)
+
+	assert.Equal(t,
+		map[string]any{"id": exportWebhookID, "name": exportWebhookName},
+		got["webhook"],
+	)
+	assert.Equal(t,
+		map[string]any{"id": exportTargetID, "name": exportTargetName},
+		got["target"],
+	)
+	assert.Equal(t, "2026-10-02T12:03:04Z", got["exported_at"])
+
+	events := exportedEvents(t, got)
+	require.Len(t, events, len(bodies))
+
+	for i, row := range stored {
+		assertExportedRow(t, row, events[i])
+	}
+}
+
+// assertExportedRow checks that ev, from an export, holds every column
+// of the stored row.
+func assertExportedRow(
+	t *testing.T, row delivery.ExportArchivedEvent, ev map[string]any,
+) {
+	t.Helper()
+
+	archivedAt, err := time.Parse(
+		time.RFC3339Nano, fmt.Sprint(ev["archived_at"]),
+	)
+	require.NoError(t, err)
+	assert.True(t, archivedAt.Equal(row.ArchivedAt))
+
+	assert.EqualValues(t, row.ID, ev["id"])
+	assert.Equal(t, row.EventID, ev["event_id"])
+	assert.Equal(t, row.WebhookID, ev["webhook_id"])
+	assert.Equal(t, row.EntrypointID, ev["entrypoint_id"])
+	assert.Equal(t, row.Method, ev["method"])
+	assert.Equal(t, row.Headers, ev["headers"])
+	assert.Equal(t, row.ContentType, ev["content_type"])
+
+	if row.Body != binaryBody {
+		assert.Equal(t, row.Body, ev["body"])
+		assert.Len(t, ev, 9, "the nine columns and nothing else: %v", ev)
+
+		return
+	}
+
+	body, err := base64.StdEncoding.DecodeString(fmt.Sprint(ev["body"]))
+	require.NoError(t, err)
+	assert.Equal(t, binaryBody, string(body))
+	assert.Equal(t, "base64", ev["body_encoding"])
+	assert.Len(t, ev, 10, "the nine columns and body_encoding: %v", ev)
+}
+
+// TestArchiveExport_Empty proves an archive with nothing in it exports
+// as an empty archived_events: no file, which the export must not
+// create; a file the archive writer has not yet put its table in; and
+// a table with no rows.
+func TestArchiveExport_Empty(t *testing.T) {
+	t.Parallel()
+
+	dir := t.TempDir()
+	missing := filepath.Join(dir, "missing.db")
+	noTable := filepath.Join(dir, "no-table.db")
+	noRows := filepath.Join(dir, "no-rows.db")
+
+	require.NoError(t, os.WriteFile(noTable, nil, 0o600))
+	require.NoError(t,
+		delivery.NewExportArchiveWriter(noRows, archiveTestLogger(), 0).
+			Open(0),
+	)
+
+	for _, path := range []string{missing, noTable, noRows} {
+		assert.Empty(t, exportedEvents(t, exportArchive(t, path)), path)
+	}
+
+	for _, suffix := range archiveFileSuffixes() {
+		assert.NoFileExists(t, missing+suffix)
+	}
+}
+
+// TestArchiveExport_ReadsOneSnapshot proves an export writes the
+// archive as it was when it was opened, and holds up no archive
+// write: a row written while the export is open is stored, and is not
+// in the export. A write held up for the whole busy timeout would
+// fail.
+func TestArchiveExport_ReadsOneSnapshot(t *testing.T) {
+	t.Parallel()
+
+	path := filepath.Join(t.TempDir(), "archive.db")
+	w := delivery.NewExportArchiveWriter(path, archiveTestLogger(), 0)
+
+	require.NoError(t, w.Write(delivery.ExportArchivedEvent{EventID: openedEventID}, 0))
+
+	export, err := delivery.OpenArchiveExport(
+		t.Context(), path, archiveTestLogger(),
+	)
+	require.NoError(t, err)
+
+	defer func() { require.NoError(t, export.Close()) }()
+
+	require.NoError(t, w.Write(delivery.ExportArchivedEvent{EventID: "during"}, 0))
+
+	assert.Equal(t,
+		[]string{openedEventID}, exportedEventIDs(t, writeExport(t, export)),
+	)
+
+	var stored int64
+
+	require.NoError(t, openArchiveDBForRead(t, path).
+		Model(&delivery.ExportArchivedEvent{}).Count(&stored).Error)
+	assert.Equal(t, int64(2), stored)
+}
+
+// TestArchiveExport_SurvivesRename proves that renaming the archive
+// while an export of it is open, as renaming its webhook or target
+// does, leaves the export reading the same file.
+func TestArchiveExport_SurvivesRename(t *testing.T) {
+	t.Parallel()
+
+	path := filepath.Join(t.TempDir(), "archive-old.db")
+	w := delivery.NewExportArchiveWriter(path, archiveTestLogger(), 0)
+
+	require.NoError(t, w.Write(delivery.ExportArchivedEvent{EventID: openedEventID}, 0))
+
+	export, err := delivery.OpenArchiveExport(
+		t.Context(), path, archiveTestLogger(),
+	)
+	require.NoError(t, err)
+
+	defer func() { require.NoError(t, export.Close()) }()
+
+	require.NoError(t, w.Rename("archive-new.db"))
+	require.NoError(t, w.Write(delivery.ExportArchivedEvent{EventID: "after"}, 0))
+	require.NoFileExists(t, path)
+
+	assert.Equal(t,
+		[]string{openedEventID}, exportedEventIDs(t, writeExport(t, export)),
+	)
+}
+
+// heapPeak is an io.Writer that discards what it is given and records
+// the largest heap it saw at a write. It collects garbage before each
+// reading, so the heap it reads is what is still held.
+type heapPeak struct {
+	max uint64
+}
+
+func (p *heapPeak) Write(b []byte) (int, error) {
+	var m runtime.MemStats
+
+	runtime.GC()
+	runtime.ReadMemStats(&m)
+	p.max = max(p.max, m.HeapAlloc)
+
+	return len(b), nil
+}
+
+// exportHeapGrowth exports an archive of rows random bodies, each
+// bodySize bytes of base64, and returns how far the heap rose above
+// where it stood when the export began, at its highest.
+func exportHeapGrowth(t *testing.T, rows, bodySize int) uint64 {
+	t.Helper()
+
+	path := filepath.Join(t.TempDir(), "archive.db")
+	w := delivery.NewExportArchiveWriter(path, archiveTestLogger(), 0)
+
+	// Base64 makes four characters of every three bytes.
+	random := make([]byte, bodySize/4*3)
+
+	for range rows {
+		_, _ = rand.Read(random)
+
+		require.NoError(t, w.Write(delivery.ExportArchivedEvent{
+			Body: base64.StdEncoding.EncodeToString(random),
+		}, 0))
+	}
+
+	export, err := delivery.OpenArchiveExport(
+		t.Context(), path, archiveTestLogger(),
+	)
+	require.NoError(t, err)
+
+	defer func() { require.NoError(t, export.Close()) }()
+
+	runtime.GC()
+
+	var start runtime.MemStats
+
+	runtime.ReadMemStats(&start)
+
+	// Through a buffer, the heap is read once per 8 KiB of output
+	// rather than at each of gzip's small writes, which takes far
+	// longer.
+	peak := &heapPeak{max: start.HeapAlloc}
+	buffered := bufio.NewWriterSize(peak, 8<<10)
+
+	require.NoError(t, writeExportTo(t, export, buffered))
+	require.NoError(t, buffered.Flush())
+
+	return peak.max - start.HeapAlloc
+}
+
+// TestArchiveExport_Streams proves an export holds neither the archive
+// nor its output in memory whole: exporting 384 KiB more of archive
+// raises the heap's peak by less than half of that. The export's own
+// memory, mostly gzip's compressor, is the same for both archives, so
+// it cancels out. The bodies are random bytes in base64, which gzip
+// shrinks by only a quarter, so an export that read every row before
+// writing, or built the JSON or the gzipped file before writing it,
+// would raise the peak by at least three quarters of the difference.
+//
+// The smaller archive has two rows so that its export, too, writes
+// out more than the 8 KiB buffer in exportHeapGrowth before it ends:
+// the heap must be read while the export's own memory is held.
+//
+//nolint:paralleltest // It measures the heap, which tests share.
+func TestArchiveExport_Streams(t *testing.T) {
+	const (
+		bodySize  = 16 << 10
+		smallRows = 2
+		largeRows = smallRows + 24
+		limit     = (largeRows - smallRows) * bodySize / 2
+	)
+
+	small := exportHeapGrowth(t, smallRows, bodySize)
+	large := exportHeapGrowth(t, largeRows, bodySize)
+
+	assert.Less(t, large, small+limit,
+		"the heap rose by %d for %d rows and by %d for %d rows",
+		small, smallRows, large, largeRows,
+	)
+}
+
+// TestArchiveExportFileName proves the download is named for the
+// webhook and the target, with the names made safe as for the archive
+// file, and the export time in UTC.
+func TestArchiveExportFileName(t *testing.T) {
+	t.Parallel()
+
+	cest := time.FixedZone("CEST", int((2 * time.Hour).Seconds()))
+
+	assert.Equal(t,
+		"archive-orders-eu-long-term-archive-20261002T120304Z.json.gz",
+		delivery.ArchiveExportFileName(
+			exportWebhookName, exportTargetName,
+			time.Date(2026, 10, 2, 14, 3, 4, 0, cest),
+		),
+	)
+}

internal/delivery/target_database_test.go

@@ -17,6 +17,7 @@ import (
 	_ "modernc.org/sqlite" // Pure Go SQLite driver.
 	"sneak.berlin/go/webhooker/internal/database"
 	"sneak.berlin/go/webhooker/internal/delivery"
+	"sneak.berlin/go/webhooker/internal/gormlog"
 )
 
 func archiveTestLogger() *slog.Logger {
@@ -42,7 +43,8 @@ func openArchiveDBForRead(
 	t.Cleanup(func() { _ = sqlDB.Close() })
 
 	gdb, err := gorm.Open(
-		sqlite.Dialector{Conn: sqlDB}, &gorm.Config{},
+		sqlite.Dialector{Conn: sqlDB},
+		&gorm.Config{Logger: gormlog.New(slog.New(slog.DiscardHandler))},
 	)
 	require.NoError(t, err)
 

internal/gormlog/gormlog.go

@@ -111,9 +111,9 @@ func (l *Logger) LogMode(gormlogger.LogLevel) gormlogger.Interface {
 //
 // One GORM path does not consult this: (*gorm.DB).Scan records the
 // statement through gorm's own traceRecorder, which does not implement
-// this interface. No production code path calls it; its one caller is
-// internal/database/database_test.go:91, whose SELECT 1 binds nothing.
-// scan_guard_test.go fails if a non-test file calls it.
+// this interface. No production code path calls it; only tests do, and
+// what a test binds is fixture data. scan_guard_test.go fails if a
+// non-test file calls it.
 // (*gorm.DB).Pluck, Row and Raw all run through the normal callback
 // processor and are filtered.
 func (l *Logger) ParamsFilter(

internal/handlers/handlers.go

@@ -97,7 +97,8 @@ type Handlers struct {
 	// names through the archive rename, the save and any move back.
 	// Interleaved, one could rename an archive between another's
 	// rename and save, leaving the file named for one edit and the
-	// stored names from the other.
+	// stored names from the other. An archive download holds it while
+	// it reads the stored names and opens the file they give.
 	renameMu sync.Mutex
 
 	// dummyVerifications counts the equivalent-cost verifications

internal/handlers/source_management_test.go

@@ -191,6 +191,7 @@ func storedRetentionDays(
 type sourceTestEnv struct {
 	handlers *handlers.Handlers
 	db       *database.Database
+	dbMgr    *database.WebhookDBManager
 	archives *recordingArchives
 	cookies  []*http.Cookie
 }
@@ -204,9 +205,11 @@ func setupSourceTest(t *testing.T) *sourceTestEnv {
 
 	var db *database.Database
 
+	var dbMgr *database.WebhookDBManager
+
 	var archives *recordingArchives
 
-	app := newTestApp(t, &h, &sess, &db, &archives)
+	app := newTestApp(t, &h, &sess, &db, &dbMgr, &archives)
 	app.RequireStart()
 
 	t.Cleanup(app.RequireStop)
@@ -214,6 +217,7 @@ func setupSourceTest(t *testing.T) *sourceTestEnv {
 	return &sourceTestEnv{
 		handlers: h,
 		db:       db,
+		dbMgr:    dbMgr,
 		archives: archives,
 		cookies: authenticatedCookies(
 			t, sess, sourceTestUserID, "sourceuser",

internal/handlers/target_download.go

@@ -0,0 +1,121 @@
+package handlers
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"time"
+
+	"sneak.berlin/go/webhooker/internal/database"
+	"sneak.berlin/go/webhooker/internal/delivery"
+)
+
+// downloadWriteTimeout is how long one write of a download may wait
+// for a client that has stopped reading.
+const downloadWriteTimeout = 60 * time.Second
+
+// HandleTargetDownload serves a database target's archive as one
+// gzipped JSON file, named for the webhook, the target and the time;
+// see delivery.ArchiveExport.WriteGzipJSON for what it holds. Other
+// target types have no archive and are a 404.
+//
+// A download runs for as long as the client keeps reading: it reads
+// under a context the request limit does not cancel, and gives each
+// write its own deadline in place of the server's write timeout. It
+// stops when a write fails.
+func (h *Handlers) HandleTargetDownload() http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		ctx := context.WithoutCancel(r.Context())
+
+		webhook, target, export, ok := h.openTargetArchive(ctx, w, r)
+		if !ok {
+			return
+		}
+
+		defer func() { _ = export.Close() }()
+
+		now := time.Now()
+
+		w.Header().Set("Content-Type", "application/gzip")
+		w.Header().Set(
+			"Content-Disposition",
+			`attachment; filename="`+delivery.ArchiveExportFileName(
+				webhook.Name, target.Name, now,
+			)+`"`,
+		)
+
+		err := export.WriteGzipJSON(
+			ctx,
+			downloadWriter{w: w, rc: http.NewResponseController(w)},
+			&webhook, target, now,
+		)
+		if err != nil {
+			h.log.Error(
+				"failed to export archive",
+				"target_id", target.ID,
+				"error", err,
+			)
+
+			// The 200 has gone out. Aborting the connection is what
+			// tells the client the file is incomplete.
+			panic(http.ErrAbortHandler)
+		}
+	}
+}
+
+// downloadWriter writes a download to the client, giving each write
+// downloadWriteTimeout to finish.
+type downloadWriter struct {
+	w  http.ResponseWriter
+	rc *http.ResponseController
+}
+
+func (d downloadWriter) Write(b []byte) (int, error) {
+	// A writer that has no write deadline, such as a test's recorder,
+	// answers http.ErrNotSupported and needs none extended.
+	err := d.rc.SetWriteDeadline(time.Now().Add(downloadWriteTimeout))
+	if err != nil && !errors.Is(err, http.ErrNotSupported) {
+		return 0, err
+	}
+
+	return d.w.Write(b)
+}
+
+// openTargetArchive opens the archive of the request's database target
+// for export, with its reads under ctx. It reports false once it has
+// written the response.
+//
+// It holds renameMu, which every archive rename runs under, while it
+// reads the stored names and opens the file, so the file it opens is
+// the one those names give. It lets go before the export is streamed:
+// once the file is open, a rename does not affect the export.
+func (h *Handlers) openTargetArchive(
+	ctx context.Context,
+	w http.ResponseWriter,
+	r *http.Request,
+) (database.Webhook, *database.Target, *delivery.ArchiveExport, bool) {
+	h.renameMu.Lock()
+	defer h.renameMu.Unlock()
+
+	webhook, target, ok := h.ownedTarget(w, r)
+	if !ok {
+		return database.Webhook{}, nil, nil, false
+	}
+
+	if target.Type != database.TargetTypeDatabase {
+		h.renderError(w, r, http.StatusNotFound)
+
+		return database.Webhook{}, nil, nil, false
+	}
+
+	export, err := delivery.OpenArchiveExport(
+		ctx, delivery.ArchivePath(h.dbMgr, &webhook, target), h.log,
+	)
+	if err != nil {
+		h.serverError(w, r, "failed to open archive for export", err)
+
+		return database.Webhook{}, nil, nil, false
+	}
+
+	return webhook, target, export, true
+}

internal/handlers/target_download_test.go

@@ -0,0 +1,379 @@
+package handlers_test
+
+import (
+	"bytes"
+	"compress/gzip"
+	"context"
+	"crypto/rand"
+	"encoding/json"
+	"errors"
+	"io"
+	"log/slog"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"sneak.berlin/go/webhooker/internal/config"
+	"sneak.berlin/go/webhooker/internal/database"
+	"sneak.berlin/go/webhooker/internal/delivery"
+	"sneak.berlin/go/webhooker/internal/middleware"
+)
+
+// errClientGone is the write failure of a client that has gone away.
+var errClientGone = errors.New("client gone")
+
+// downloadPath is the archive download route of a target.
+func downloadPath(webhookID, targetID string) string {
+	return "/hook/" + webhookID + "/targets/" + targetID + "/download"
+}
+
+// renameTarget submits the edit form renaming a target to Renamed.
+func renameTarget(
+	env *sourceTestEnv, webhookID, targetID string,
+) *httptest.ResponseRecorder {
+	form := url.Values{}
+	form.Set("name", "Renamed")
+
+	return submitTargetEdit(env, webhookID, targetID, form)
+}
+
+// TestHandleTargetDownload proves a database target's archive
+// downloads as a gzipped JSON attachment named for the webhook, the
+// target and the time, here with no archive file yet, so with no
+// rows; and that a target of another type has no download.
+func TestHandleTargetDownload(t *testing.T) {
+	t.Parallel()
+
+	env := setupSourceTest(t)
+	wh := seedWebhookWithRetention(t, env.db, 7)
+	archive := seedTarget(t, env.db, wh.ID, database.TargetTypeDatabase)
+	logTarget := seedTarget(t, env.db, wh.ID, database.TargetTypeLog)
+
+	w := serveTarget(
+		env, http.MethodGet, downloadPath(wh.ID, archive.ID), nil,
+	)
+	require.Equal(t, http.StatusOK, w.Code, w.Body.String())
+	assert.Equal(t, "application/gzip", w.Header().Get("Content-Type"))
+	assert.Regexp(t,
+		`^attachment; filename="archive-seeded-t-database-`+
+			`\d{8}T\d{6}Z\.json\.gz"$`,
+		w.Header().Get("Content-Disposition"),
+	)
+
+	zr, err := gzip.NewReader(w.Body)
+	require.NoError(t, err)
+
+	var got map[string]json.RawMessage
+
+	require.NoError(t, json.NewDecoder(zr).Decode(&got))
+	assert.JSONEq(t,
+		`{"id":"`+archive.ID+`","name":"t-database"}`,
+		string(got["target"]),
+	)
+	assert.JSONEq(t, `[]`, string(got["archived_events"]))
+
+	w = serveTarget(
+		env, http.MethodGet, downloadPath(wh.ID, logTarget.ID), nil,
+	)
+	assert.Equal(t, http.StatusNotFound, w.Code)
+}
+
+// TestHandleTargetDownload_WaitsForRename proves a download reads the
+// target's names and opens its archive under the lock a rename holds:
+// started while an edit is renaming the archive, it waits, and is
+// named for the target's new name.
+func TestHandleTargetDownload_WaitsForRename(t *testing.T) {
+	t.Parallel()
+
+	env := setupSourceTest(t)
+	wh := seedWebhookWithRetention(t, env.db, 7)
+	archive := seedTarget(t, env.db, wh.ID, database.TargetTypeDatabase)
+
+	renaming, release := env.archives.BlockNextRename()
+	edited := make(chan *httptest.ResponseRecorder, 1)
+
+	go func() {
+		edited <- renameTarget(env, wh.ID, archive.ID)
+	}()
+
+	<-renaming
+
+	downloaded := make(chan *httptest.ResponseRecorder, 1)
+
+	go func() {
+		downloaded <- serveTarget(
+			env, http.MethodGet, downloadPath(wh.ID, archive.ID), nil,
+		)
+	}()
+
+	select {
+	case <-downloaded:
+		release()
+		t.Fatal("the download did not wait for the rename")
+	case <-time.After(100 * time.Millisecond):
+	}
+
+	release()
+	require.Equal(t, http.StatusSeeOther, (<-edited).Code)
+
+	w := <-downloaded
+	require.Equal(t, http.StatusOK, w.Code)
+	assert.Contains(t,
+		w.Header().Get("Content-Disposition"), "archive-seeded-renamed-",
+	)
+}
+
+// stalledWriter is a response writer whose first write waits until
+// resume is closed, closing writing when it starts to wait.
+type stalledWriter struct {
+	*httptest.ResponseRecorder
+
+	once    sync.Once
+	writing chan struct{}
+	resume  chan struct{}
+}
+
+func (s *stalledWriter) Write(b []byte) (int, error) {
+	s.once.Do(func() {
+		close(s.writing)
+		<-s.resume
+	})
+
+	return s.ResponseRecorder.Write(b)
+}
+
+// TestHandleTargetDownload_StreamsWithoutTheLock proves a download
+// lets go of the rename lock once its archive is open: while the
+// download is stalled writing, an edit can still rename the target.
+func TestHandleTargetDownload_StreamsWithoutTheLock(t *testing.T) {
+	t.Parallel()
+
+	env := setupSourceTest(t)
+	wh := seedWebhookWithRetention(t, env.db, 7)
+	archive := seedTarget(t, env.db, wh.ID, database.TargetTypeDatabase)
+
+	req := httptest.NewRequestWithContext(
+		t.Context(), http.MethodGet, downloadPath(wh.ID, archive.ID), nil,
+	)
+	for _, c := range env.cookies {
+		req.AddCookie(c)
+	}
+
+	sw := &stalledWriter{
+		ResponseRecorder: httptest.NewRecorder(),
+		writing:          make(chan struct{}),
+		resume:           make(chan struct{}),
+	}
+	downloaded := make(chan struct{})
+
+	go func() {
+		targetRouter(env).ServeHTTP(sw, req)
+		close(downloaded)
+	}()
+
+	<-sw.writing
+
+	edited := make(chan *httptest.ResponseRecorder, 1)
+
+	go func() {
+		edited <- renameTarget(env, wh.ID, archive.ID)
+	}()
+
+	select {
+	case w := <-edited:
+		assert.Equal(t, http.StatusSeeOther, w.Code)
+	case <-time.After(10 * time.Second):
+		t.Error("the rename waited for the download")
+	}
+
+	close(sw.resume)
+	<-downloaded
+	assert.Equal(t, http.StatusOK, sw.Code)
+}
+
+// seedArchive writes rows to the archive file at path, each with a
+// body of bodySize random bytes, which do not compress. Its table has
+// only the columns the test fills; an export writes the others empty.
+func seedArchive(t *testing.T, path string, rows, bodySize int) {
+	t.Helper()
+
+	db, err := database.OpenSQLite(path, database.SQLiteModeCreate)
+	require.NoError(t, err)
+
+	defer func() { require.NoError(t, db.Close()) }()
+
+	_, err = db.ExecContext(t.Context(),
+		"CREATE TABLE archived_events (id INTEGER PRIMARY KEY, body TEXT)",
+	)
+	require.NoError(t, err)
+
+	body := make([]byte, bodySize)
+
+	for range rows {
+		_, _ = rand.Read(body)
+
+		_, err = db.ExecContext(t.Context(),
+			"INSERT INTO archived_events (body) VALUES (?)", string(body),
+		)
+		require.NoError(t, err)
+	}
+}
+
+// limitedServer serves the target routes as the server does, behind the
+// access log, whose lines it returns, and the request limit, here
+// limit, which is also its write timeout. Each connection's send buffer
+// is a few KiB, so a larger response is still being written while its
+// client is not reading.
+func limitedServer(
+	t *testing.T, env *sourceTestEnv, limit time.Duration,
+) (*httptest.Server, *bytes.Buffer) {
+	t.Helper()
+
+	const sendBuffer = 4 << 10
+
+	logBuf := new(bytes.Buffer)
+	mw := middleware.NewForTest(
+		slog.New(slog.NewJSONHandler(logBuf, nil)),
+		&config.Config{Environment: config.EnvironmentDev},
+		nil,
+	)
+
+	srv := httptest.NewUnstartedServer(
+		mw.Logging()(mw.Timeout(limit)(targetRouter(env))),
+	)
+	srv.Config.WriteTimeout = limit
+	srv.Config.ConnContext = func(
+		ctx context.Context, c net.Conn,
+	) context.Context {
+		tcp, ok := c.(*net.TCPConn)
+		if assert.True(t, ok) {
+			assert.NoError(t, tcp.SetWriteBuffer(sendBuffer))
+		}
+
+		return ctx
+	}
+	srv.Start()
+	t.Cleanup(srv.Close)
+
+	return srv, logBuf
+}
+
+// TestHandleTargetDownload_OutlastsTheRequestLimit proves a download
+// runs for as long as the client keeps reading, and is logged as the
+// 200 it was. Behind a request limit and a server write timeout of a
+// tenth of a second, the client stops reading once the response has
+// started, waits three times as long, and still gets the whole file.
+// The archive is larger than the connection holds, so the download is
+// still being written while the client waits.
+func TestHandleTargetDownload_OutlastsTheRequestLimit(t *testing.T) {
+	t.Parallel()
+
+	const (
+		limit    = 100 * time.Millisecond
+		rows     = 8
+		bodySize = 64 << 10
+	)
+
+	env := setupSourceTest(t)
+	wh := seedWebhookWithRetention(t, env.db, 7)
+	archive := seedTarget(t, env.db, wh.ID, database.TargetTypeDatabase)
+	seedArchive(
+		t, delivery.ArchivePath(env.dbMgr, &wh, archive), rows, bodySize,
+	)
+
+	srv, accessLog := limitedServer(t, env, limit)
+
+	req, err := http.NewRequestWithContext(
+		t.Context(), http.MethodGet,
+		srv.URL+downloadPath(wh.ID, archive.ID), nil,
+	)
+	require.NoError(t, err)
+
+	for _, c := range env.cookies {
+		req.AddCookie(c)
+	}
+
+	resp, err := srv.Client().Do(req)
+	require.NoError(t, err)
+
+	defer func() { _ = resp.Body.Close() }()
+
+	require.Equal(t, http.StatusOK, resp.StatusCode)
+
+	time.Sleep(3 * limit)
+
+	zr, err := gzip.NewReader(resp.Body)
+	require.NoError(t, err)
+
+	var (
+		got    map[string]json.RawMessage
+		events []json.RawMessage
+	)
+
+	require.NoError(t, json.NewDecoder(zr).Decode(&got))
+	require.NoError(t, json.Unmarshal(got["archived_events"], &events))
+	assert.Len(t, events, rows)
+
+	// Reading to the end makes the gzip reader check that the file was
+	// finished.
+	_, err = io.ReadAll(zr)
+	require.NoError(t, err)
+
+	// Close waits for the handler, so the access log line is written.
+	srv.Close()
+
+	var access map[string]any
+
+	require.NoError(t, json.Unmarshal(accessLog.Bytes(), &access))
+	assert.EqualValues(t, http.StatusOK, access["status"])
+	assert.GreaterOrEqual(t,
+		access["latency_ms"], float64(limit.Milliseconds()),
+		"the download must outlast the request limit",
+	)
+}
+
+// brokenWriter is a response writer whose writes fail once the
+// response has started, as they do when the client goes away.
+type brokenWriter struct {
+	*httptest.ResponseRecorder
+}
+
+func (b brokenWriter) Write(p []byte) (int, error) {
+	if b.Body.Len() > 0 {
+		return 0, errClientGone
+	}
+
+	return b.ResponseRecorder.Write(p)
+}
+
+// TestHandleTargetDownload_AbortsWhenItFails proves a download that
+// fails after its response has started aborts the connection, so the
+// client sees a failed download rather than a file that looks
+// complete and does not decompress.
+func TestHandleTargetDownload_AbortsWhenItFails(t *testing.T) {
+	t.Parallel()
+
+	env := setupSourceTest(t)
+	wh := seedWebhookWithRetention(t, env.db, 7)
+	archive := seedTarget(t, env.db, wh.ID, database.TargetTypeDatabase)
+
+	req := httptest.NewRequestWithContext(
+		t.Context(), http.MethodGet, downloadPath(wh.ID, archive.ID), nil,
+	)
+	for _, c := range env.cookies {
+		req.AddCookie(c)
+	}
+
+	w := brokenWriter{ResponseRecorder: httptest.NewRecorder()}
+
+	assert.PanicsWithValue(t, http.ErrAbortHandler, func() {
+		targetRouter(env).ServeHTTP(w, req)
+	})
+	assert.Equal(t, http.StatusOK, w.Code)
+}

internal/handlers/target_edit_test.go

@@ -37,14 +37,18 @@ const (
 	editAuthHeader   = "Authorization: Bearer " + editBearerSecret
 )
 
-// targetRouter mounts the target create and edit routes on a chi
-// router so the handlers see the URL parameters they read.
+// targetRouter mounts the target create, edit and download routes on
+// a chi router so the handlers see the URL parameters they read.
 func targetRouter(env *sourceTestEnv) *chi.Mux {
 	router := chi.NewRouter()
 	router.Post(
 		"/hook/{sourceID}/targets",
 		env.handlers.HandleTargetCreate(),
 	)
+	router.Get(
+		"/hook/{sourceID}/targets/{targetID}/download",
+		env.handlers.HandleTargetDownload(),
+	)
 	router.Get(
 		"/hook/{sourceID}/targets/{targetID}/edit",
 		env.handlers.HandleTargetEdit(),

internal/middleware/timeout.go

@@ -0,0 +1,71 @@
+package middleware
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"time"
+)
+
+// Timeout returns middleware that gives each request limit to finish:
+// it cancels the request's context once limit has passed, and answers
+// 504 when the handler then returns without having started its
+// response.
+//
+// It replaces chi's middleware.Timeout, which writes that 504 even
+// after the handler has sent its own status. A download that outlasts
+// the limit has already sent its 200 and the whole file, so the late
+// 504 changes nothing for the client: the access log and the metrics
+// would record it in place of the 200, and net/http would complain of
+// a superfluous WriteHeader.
+func (s *Middleware) Timeout(
+	limit time.Duration,
+) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(
+			w http.ResponseWriter,
+			r *http.Request,
+		) {
+			ctx, cancel := context.WithTimeout(r.Context(), limit)
+			defer cancel()
+
+			tw := &timeoutResponseWriter{ResponseWriter: w}
+
+			next.ServeHTTP(tw, r.WithContext(ctx))
+
+			if !tw.started &&
+				errors.Is(ctx.Err(), context.DeadlineExceeded) {
+				w.WriteHeader(http.StatusGatewayTimeout)
+			}
+		})
+	}
+}
+
+// timeoutResponseWriter records whether the handler has started its
+// response.
+type timeoutResponseWriter struct {
+	http.ResponseWriter
+
+	started bool
+}
+
+func (w *timeoutResponseWriter) WriteHeader(code int) {
+	w.started = true
+
+	w.ResponseWriter.WriteHeader(code)
+}
+
+func (w *timeoutResponseWriter) Write(b []byte) (int, error) {
+	// A Write without a WriteHeader starts the response too: net/http
+	// sends 200 in front of it.
+	w.started = true
+
+	//nolint:wrapcheck // Pass the writer's own error through unchanged.
+	return w.ResponseWriter.Write(b)
+}
+
+// Unwrap lets http.ResponseController reach the writer underneath, so
+// a handler can still set a write deadline through this wrapper.
+func (w *timeoutResponseWriter) Unwrap() http.ResponseWriter {
+	return w.ResponseWriter
+}

internal/middleware/timeout_test.go

@@ -0,0 +1,56 @@
+package middleware_test
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestTimeout proves the request limit answers 504 to a handler that
+// outlasts it without starting its response, and leaves a response the
+// handler has started with the status it sent. Both are what the
+// access log records.
+func TestTimeout(t *testing.T) {
+	t.Parallel()
+
+	const limit = 10 * time.Millisecond
+
+	for _, tc := range []struct {
+		name string
+		sent int // the status the handler sends, or 0 for none
+		want int
+	}{
+		{name: "not started", sent: 0, want: http.StatusGatewayTimeout},
+		{name: "started", sent: http.StatusOK, want: http.StatusOK},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+
+			m, buf := capturingMiddleware(t)
+			handler := m.Logging()(m.Timeout(limit)(http.HandlerFunc(
+				func(w http.ResponseWriter, r *http.Request) {
+					if tc.sent != 0 {
+						w.WriteHeader(tc.sent)
+					}
+
+					<-r.Context().Done()
+				},
+			)))
+
+			w := httptest.NewRecorder()
+			handler.ServeHTTP(w, httptest.NewRequestWithContext(
+				t.Context(), http.MethodGet, "/", nil,
+			))
+
+			assert.Equal(t, tc.want, w.Code)
+
+			entries := accessLogEntries(t, buf)
+			require.Len(t, entries, 1)
+			assert.EqualValues(t, tc.want, entries[0]["status"])
+		})
+	}
+}

internal/server/archive_download_test.go

@@ -0,0 +1,69 @@
+package server_test
+
+import (
+	"compress/gzip"
+	"encoding/json"
+	"net/http"
+	"regexp"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"gorm.io/gorm/clause"
+	"sneak.berlin/go/webhooker/internal/database"
+)
+
+// TestHook_DownloadArchive follows the Download link the webhook page
+// shows for a database target, and only for it, and gets the archive
+// as a gzipped JSON file. Signed out, the link leads to the login page.
+func TestHook_DownloadArchive(t *testing.T) {
+	t.Parallel()
+
+	env := newTestEnv(t)
+
+	userID, _ := env.seedUser(t, "archivist", "somepassword")
+	cookies := env.authCookies(t, userID, "archivist")
+	wh := env.seedWebhook(t, userID)
+	env.seedTarget(t, wh.ID)
+
+	archive := &database.Target{
+		WebhookID: wh.ID,
+		Name:      "kept",
+		Type:      database.TargetTypeDatabase,
+		Active:    true,
+	}
+	require.NoError(t,
+		env.db.DB().Omit(clause.Associations).Create(archive).Error,
+	)
+
+	page := env.get("/hook/"+wh.ID, cookies)
+	require.Equal(t, http.StatusOK, page.Code)
+
+	links := regexp.MustCompile(
+		`href="(/hook/[^/"]+/targets/[^/"]+/download)"`,
+	).FindAllStringSubmatch(page.Body.String(), -1)
+	require.Len(t, links, 1, "only the database target has a Download")
+
+	link := links[0][1]
+	assert.Equal(t,
+		"/hook/"+wh.ID+"/targets/"+archive.ID+"/download", link,
+	)
+
+	w := env.get(link, cookies)
+	require.Equal(t, http.StatusOK, w.Code)
+	assert.Equal(t, "application/gzip", w.Header().Get("Content-Type"))
+
+	zr, err := gzip.NewReader(w.Body)
+	require.NoError(t, err)
+
+	var got map[string]json.RawMessage
+
+	require.NoError(t, json.NewDecoder(zr).Decode(&got))
+	assert.JSONEq(t,
+		`{"id":"`+wh.ID+`","name":"routed"}`, string(got["webhook"]),
+	)
+
+	w = env.get(link, nil)
+	assert.Equal(t, http.StatusSeeOther, w.Code)
+	assert.Contains(t, w.Header().Get("Location"), "/pages/login")
+}

internal/server/export_test.go

@@ -1,6 +1,8 @@
 package server
 
 import (
+	"context"
+	"log/slog"
 	"net/http"
 	"testing"
 
@@ -37,6 +39,14 @@ func SentryClientOptionsForTest(
 	return sentryClientOptions(dsn, release)
 }
 
+// CleanShutdownForTest runs the server's stop hook, cleanShutdown,
+// against hs: a server the test started itself, so it can hold a
+// request open across the drain. Sentry is off.
+func CleanShutdownForTest(ctx context.Context, hs *http.Server) {
+	s := &Server{log: slog.New(slog.DiscardHandler), httpServer: hs}
+	s.cleanShutdown(ctx)
+}
+
 // newServerForTest builds a Server through New, as the application
 // does, on a lifecycle that is never started: the hooks New adds to
 // it never run, so nothing listens.

internal/server/routes.go

@@ -73,7 +73,7 @@ func (s *Server) setupGlobalMiddleware() {
 	}
 
 	s.router.Use(s.mw.CORS())
-	s.router.Use(middleware.Timeout(requestTimeout))
+	s.router.Use(s.mw.Timeout(requestTimeout))
 
 	// Panic recovery, deliberately here rather than first. It has to
 	// run inside every middleware that observes the response, so the
@@ -312,6 +312,10 @@ func (s *Server) setupSourceRoutes() {
 			"/targets/{targetID}/edit",
 			s.h.HandleTargetEditSubmit(),
 		)
+		r.Get(
+			"/targets/{targetID}/download",
+			s.h.HandleTargetDownload(),
+		)
 		r.Post(
 			"/targets/{targetID}/delete",
 			s.h.HandleTargetDelete(),

internal/server/server.go

@@ -39,6 +39,12 @@ const (
 	// refuses to spend, leaving it for the hooks that run after the
 	// server: the delivery engine, the healthcheck, the webhook DB
 	// manager and the database close.
+	//
+	// Its value is not tuned to those hooks, which take about a
+	// millisecond between them. It is what the 5s fx stop timeout in
+	// cmd/webhooker leaves after a full ShutdownTimeout drain, so a
+	// drain that starts on a full budget still gets all of
+	// ShutdownTimeout.
 	TailHookReserve = 2 * time.Second
 
 	// sentryFlushTimeout is the longest wait for Sentry to flush
@@ -59,6 +65,16 @@ const (
 // key off it, and a zero exit would read as a deliberate stop.
 const StartupFailureExitCode = 1
 
+// DrainBudget reports how long the HTTP drain may wait for in-flight
+// requests when remaining is the time left on the fx stop context as
+// the server's stop hook starts. The hooks before the server can
+// already have spent part of the budget, so the drain takes its time
+// out of what they left, never out of TailHookReserve. Zero or less
+// means no wait at all.
+func DrainBudget(remaining time.Duration) time.Duration {
+	return min(ShutdownTimeout, remaining-TailHookReserve)
+}
+
 // SentryFlushBudget reports how long the Sentry flush may run when
 // remaining is the time left on the fx stop context after the HTTP
 // drain. sentry.Flush takes a bare duration and honours no context,
@@ -261,10 +277,17 @@ func (s *Server) cleanupForExit() {
 	s.log.Info("cleaning up")
 }
 
+// cleanShutdown drains the HTTP server and flushes Sentry inside what
+// is left of the fx stop budget. A context carrying no deadline — a
+// caller outside the fx lifecycle — gets the full ShutdownTimeout.
 func (s *Server) cleanShutdown(ctx context.Context) {
-	ctxShutdown, shutdownCancel := context.WithTimeout(
-		ctx, ShutdownTimeout,
-	)
+	drain := ShutdownTimeout
+
+	if deadline, ok := ctx.Deadline(); ok {
+		drain = DrainBudget(time.Until(deadline))
+	}
+
+	ctxShutdown, shutdownCancel := context.WithTimeout(ctx, drain)
 	defer shutdownCancel()
 
 	err := s.httpServer.Shutdown(ctxShutdown)

internal/server/shutdown_test.go

@@ -1,13 +1,148 @@
 package server_test
 
 import (
+	"context"
+	"net"
+	"net/http"
 	"testing"
+	"testing/synctest"
 	"time"
 
 	"github.com/stretchr/testify/require"
 	"sneak.berlin/go/webhooker/internal/server"
 )
 
+// TestDrainBudget covers the clamp that keeps the HTTP drain from
+// spending the tail hooks' share of the fx stop budget when the hooks
+// before the server have already used part of it.
+func TestDrainBudget(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name      string
+		remaining time.Duration
+		want      time.Duration
+	}{
+		{
+			name:      "only the reserve is left",
+			remaining: server.TailHookReserve,
+			want:      0,
+		},
+		{
+			name:      "earlier hooks spent part of the budget",
+			remaining: server.TailHookReserve + time.Second,
+			want:      time.Second,
+		},
+		{
+			name:      "capped at the nominal timeout",
+			remaining: time.Hour,
+			want:      server.ShutdownTimeout,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			require.Equal(t, tt.want, server.DrainBudget(tt.remaining))
+		})
+	}
+}
+
+// TestCleanShutdown_LeavesTailHookReserve stops the server with a
+// request still in flight, after the hooks before it have spent all
+// of the stop budget but TailHookReserve. The drain must give up at
+// once rather than wait for the request: what is left belongs to the
+// hooks after the server, the database close among them. A drain
+// bounded only by ShutdownTimeout waits until the stop context
+// expires, and fx then skips those hooks.
+//
+// The test runs in a synctest bubble, whose clock moves only while
+// every goroutine in it is blocked, so a drain that gives up at once
+// leaves the stop context unexpired however slow the host is. The
+// request travels over net.Pipe because a goroutine waiting on a
+// real socket would stop that clock from moving at all.
+func TestCleanShutdown_LeavesTailHookReserve(t *testing.T) {
+	t.Parallel()
+
+	synctest.Test(t, func(t *testing.T) {
+		entered := make(chan struct{})
+		release := make(chan struct{})
+
+		hs := &http.Server{
+			Handler: http.HandlerFunc(
+				func(http.ResponseWriter, *http.Request) {
+					close(entered)
+					<-release
+				},
+			),
+			ReadHeaderTimeout: time.Second,
+		}
+
+		srvConn, cliConn := net.Pipe()
+
+		listener := pipeListener{
+			conns:  make(chan net.Conn, 1),
+			closed: make(chan struct{}),
+		}
+		listener.conns <- srvConn
+
+		go func() { _ = hs.Serve(listener) }()
+
+		// Cleanups run last first: the handler returns, then closing
+		// the client end ends the server's write of the response.
+		t.Cleanup(func() { _ = cliConn.Close() })
+		t.Cleanup(func() { close(release) })
+
+		_, err := cliConn.Write(
+			[]byte("GET / HTTP/1.1\r\nHost: webhooker.test\r\n\r\n"),
+		)
+		require.NoError(t, err)
+
+		<-entered
+
+		stopCtx, cancel := context.WithTimeout(
+			t.Context(), server.TailHookReserve,
+		)
+		defer cancel()
+
+		server.CleanShutdownForTest(stopCtx, hs)
+
+		require.NoError(
+			t, stopCtx.Err(), "the drain spent the tail hooks' reserve",
+		)
+	})
+}
+
+// pipeListener is the net.Listener http.Server.Serve needs to serve
+// the server end of a net.Pipe: Accept returns that one connection,
+// then waits until Close, as a real listener with no more clients
+// does.
+type pipeListener struct {
+	conns  chan net.Conn
+	closed chan struct{}
+}
+
+func (l pipeListener) Accept() (net.Conn, error) {
+	select {
+	case conn := <-l.conns:
+		return conn, nil
+	case <-l.closed:
+		return nil, net.ErrClosed
+	}
+}
+
+func (l pipeListener) Close() error {
+	close(l.closed)
+
+	return nil
+}
+
+// Addr is never called by http.Server.Serve.
+func (pipeListener) Addr() net.Addr {
+	return nil
+}
+
 // TestSentryFlushBudget covers the clamp that keeps the Sentry flush
 // from spending the tail hooks' share of the fx stop budget.
 // sentry.Flush ignores the stop context, so without the clamp a

templates/source_detail.html

@@ -157,6 +157,9 @@
                             {{else}}
                             <span class="badge-error">Inactive</span>
                             {{end}}
+                            {{if eq .Type "database"}}
+                            <a href="/hook/{{$.Webhook.ID}}/targets/{{.ID}}/download" class="btn-small" title="Download the archive as gzipped JSON">Download</a>
+                            {{end}}
                             <a href="/hook/{{$.Webhook.ID}}/targets/{{.ID}}/edit" class="btn-small" title="Edit">Edit</a>
                             <form method="POST" action="/hook/{{$.Webhook.ID}}/targets/{{.ID}}/toggle" class="inline">
                                 <input type="hidden" name="csrf_token" value="{{$.CSRFToken}}">