Rotate a database target's archive monthly, daily or hourly (closes #379)

A database target's rotation (none, monthly, daily or hourly) puts the
UTC period of each event's receive time in its archive file name, so
each file holds exactly its period's events. It is on the new webhook
page, the add target form and the target edit form, and shown in the
target list.

Renames move every one of a target's files, the sweep prunes every file
and deletes a rotated file it leaves empty, Download exports every file
oldest first with each row's period, and the target list names the
current file and totals the size of all of them.

Model: opus-5-5

internal/delivery/archive_sweeper_test.go

@@ -163,6 +163,17 @@ func (env *archiveEnv) seedArchiveRows(
 	t.Helper()
 
 	path := env.archivePath(tgt)
+	seedArchiveFile(t, path, tgt.WebhookID, archivedAt...)
+
+	return path
+}
+
+// seedArchiveFile creates the archive file at path and inserts one row
+// per supplied archived-at timestamp, as seedArchiveRows does.
+func seedArchiveFile(
+	t *testing.T, path, webhookID string, archivedAt ...time.Time,
+) {
+	t.Helper()
 
 	sqlDB, err := sql.Open(
 		"sqlite", fmt.Sprintf("file:%s?mode=rwc", path),
@@ -182,7 +193,7 @@ func (env *archiveEnv) seedArchiveRows(
 	for i, at := range archivedAt {
 		row := delivery.ExportArchivedEvent{
 			EventID:    fmt.Sprintf("ev-%d", i),
-			WebhookID:  tgt.WebhookID,
+			WebhookID:  webhookID,
 			Method:     http.MethodPost,
 			Body:       `{"seeded":true}`,
 			ArchivedAt: at,
@@ -191,8 +202,6 @@ func (env *archiveEnv) seedArchiveRows(
 	}
 
 	require.NoError(t, sqlDB.Close())
-
-	return path
 }
 
 // archivedEventIDs returns the event ids currently stored in an