feat(store): persist poll lane state

backend/AGENTS.md

@@ -31,8 +31,7 @@ image, TLS terminated by the reverse proxy so the service listens plain `:8080`.
 store must have that `TestMain` or it has no database at all.
 
 ### Reader-owned store — `internal/store`, `internal/token`
-
-Four tables; shape is in the migrations, behaviour in `Store`'s methods.
+- The Reader-owned tables are `readers`, `bookmarks`, `series`, and `sessions`; auxiliary `covers`, `poll_lanes`, and `poll_passes` are also defined in the migrations.
 
 - **Credentials are derived, never stored.** `token.Token(TOKEN_KEY, discord_id, epoch)`
   is an HMAC; only its SHA-256 reaches `readers.token_sha256`. So install URLs

backend/internal/store/migrations/0012_poll_lanes.sql

@@ -0,0 +1,6 @@
+-- One durable state row per Poll Lane. Zero means no pause or refusal is set.
+CREATE TABLE poll_lanes (
+  site         text NOT NULL PRIMARY KEY,
+  paused_until bigint NOT NULL DEFAULT 0,
+  refuse_until bigint NOT NULL DEFAULT 0
+);

backend/internal/store/migrations/0013_poll_passes.sql

@@ -0,0 +1,16 @@
+-- Append-only Lane Pass log. Timestamps are unix milliseconds from the poller's clock.
+CREATE TABLE poll_passes (
+  site        text NOT NULL,
+  ran_at      bigint NOT NULL,
+  skip        text NOT NULL,
+  due         integer NOT NULL,
+  checked     integer NOT NULL,
+  gap_ms      bigint NOT NULL,
+  clamped     boolean NOT NULL,
+  refused     integer NOT NULL,
+  unreachable integer NOT NULL,
+  no_chapter  integer NOT NULL,
+  unfetchable integer NOT NULL,
+  errors      integer NOT NULL,
+  PRIMARY KEY (site, ran_at)
+);

backend/internal/store/store.go

@@ -90,6 +90,34 @@ type Series struct {
 	readerCount int
 }
 
+// LanePass is one Poll Lane's durable pass snapshot. Pause and refusal stamps
+// are joined from poll_lanes on read; they are not pass facts.
+type LanePass struct {
+	Site                            string
+	RanAt                           int64
+	Skip                            string
+	Due, Checked                    int
+	GapMS                           int64
+	Clamped                         bool
+	Refused, Unreachable, NoChapter int
+	Unfetchable, Errors             int
+	PausedUntil, RefuseUntil        int64
+}
+
+// SiteOutcomes is one Site's summed Lane Pass outcomes over a caller-supplied
+// window.
+type SiteOutcomes struct {
+	Site                            string
+	Refused, Unreachable, NoChapter int
+	Unfetchable, Errors             int
+}
+
+// LanePause is one persisted Lane pause stamp.
+type LanePause struct {
+	Site        string
+	PausedUntil int64
+}
+
 // Key returns the canonical identity in bookmark-key form ("<site>:<series_id>"),
 // used by the poller's logs and by tests asserting on the due queue.
 func (s Series) Key() string { return s.Site + ":" + s.SeriesID }
@@ -188,9 +216,9 @@ const (
 //go:embed migrations/*.sql
 var migrations embed.FS
 
-// bookmarkColumns is the only value ever concatenated into query text. It is a
-// compile-time constant; every request value is bound as a parameter. The
-// series-owned fields are joined in from the series table, in scanBookmark
+// These column lists are the only values ever concatenated into query text.
+// They are compile-time constants; every request value is bound as a parameter.
+// The series-owned fields are joined in from the series table, in scanBookmark
 // order, so the flat Bookmark reads back whole despite the split (ADR-0004).
 const bookmarkColumns = `b.site, b.series_id, s.title, s.series_url, s.cover_address,
 	b.last_chapter, b.last_chapter_num, b.last_chapter_url,
@@ -202,6 +230,10 @@ const bookmarkColumns = `b.site, b.series_id, s.title, s.series_url, s.cover_add
 const seriesColumns = `s.site, s.series_id, s.title, s.series_url, s.cover, s.cover_address,
 	s.kind, s.latest_chapter, s.latest_chapter_num, s.latest_checked_at, s.latest_raised_by`
 
+const lanePassColumns = `p.site, p.ran_at, p.skip, p.due, p.checked, p.gap_ms, p.clamped,
+	p.refused, p.unreachable, p.no_chapter, p.unfetchable, p.errors,
+	COALESCE(l.paused_until, 0), COALESCE(l.refuse_until, 0)`
+
 // Owner is the person running the service: the first Reader, seeded at startup
 // so a fresh deployment has a library before anyone logs in. The seed makes
 // sure exactly one readers row matches their Discord ID, carrying the SHA-256
@@ -613,6 +645,18 @@ func scanSeries(scan func(...any) error) (Series, error) {
 	return sr, nil
 }
 
+func scanLanePass(scan func(...any) error) (LanePass, error) {
+	var p LanePass
+	if err := scan(
+		&p.Site, &p.RanAt, &p.Skip, &p.Due, &p.Checked, &p.GapMS, &p.Clamped,
+		&p.Refused, &p.Unreachable, &p.NoChapter, &p.Unfetchable, &p.Errors,
+		&p.PausedUntil, &p.RefuseUntil,
+	); err != nil {
+		return LanePass{}, err
+	}
+	return p, nil
+}
+
 // Close releases the underlying database handle.
 func (s *Store) Close() error { return s.db.Close() }
 
@@ -934,6 +978,182 @@ func (s *Store) Delete(readerID int64, key string) error {
 	return nil
 }
 
+// RecordLanePass appends one pass and prunes every older row in the same
+// transaction. retainBefore is supplied by the poller's clock.
+func (s *Store) RecordLanePass(p LanePass, retainBefore int64) error {
+	tx, err := s.db.Begin()
+	if err != nil {
+		return fmt.Errorf("begin lane pass %s: %w", p.Site, err)
+	}
+	defer tx.Rollback()
+	if _, err := tx.Exec(`
+		INSERT INTO poll_passes
+			(site, ran_at, skip, due, checked, gap_ms, clamped,
+			 refused, unreachable, no_chapter, unfetchable, errors)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12)`,
+		p.Site, p.RanAt, p.Skip, p.Due, p.Checked, p.GapMS, p.Clamped,
+		p.Refused, p.Unreachable, p.NoChapter, p.Unfetchable, p.Errors); err != nil {
+		return fmt.Errorf("insert lane pass %s at %d: %w", p.Site, p.RanAt, err)
+	}
+	if _, err := tx.Exec(`DELETE FROM poll_passes WHERE ran_at < $1`, retainBefore); err != nil {
+		return fmt.Errorf("prune lane passes before %d: %w", retainBefore, err)
+	}
+	if err := tx.Commit(); err != nil {
+		return fmt.Errorf("commit lane pass %s at %d: %w", p.Site, p.RanAt, err)
+	}
+	return nil
+}
+
+// LatestLanePass returns the newest pass for one Site, with its current Lane
+// state joined on. A Site without a pass has no durable snapshot yet.
+func (s *Store) LatestLanePass(site string) (LanePass, bool, error) {
+	p, err := scanLanePass(s.db.QueryRow(`SELECT `+lanePassColumns+`
+		FROM poll_passes p
+		LEFT JOIN poll_lanes l ON l.site = p.site
+		WHERE p.site = $1
+		ORDER BY p.ran_at DESC
+		LIMIT 1`, site).Scan)
+	if errors.Is(err, sql.ErrNoRows) {
+		return LanePass{}, false, nil
+	}
+	if err != nil {
+		return LanePass{}, false, fmt.Errorf("latest lane pass %s: %w", site, err)
+	}
+	return p, true, nil
+}
+
+// LatestLanePasses returns the newest pass for each Site, with current Lane
+// state joined on. Sites without a pass have no row yet.
+func (s *Store) LatestLanePasses() ([]LanePass, error) {
+	rows, err := s.db.Query(`SELECT ` + lanePassColumns + `
+		FROM (
+			SELECT DISTINCT ON (site)
+				site, ran_at, skip, due, checked, gap_ms, clamped,
+				refused, unreachable, no_chapter, unfetchable, errors
+			FROM poll_passes
+			ORDER BY site, ran_at DESC
+		) p
+		LEFT JOIN poll_lanes l ON l.site = p.site
+		ORDER BY p.site`)
+	if err != nil {
+		return nil, fmt.Errorf("query latest lane passes: %w", err)
+	}
+	defer rows.Close()
+
+	out := []LanePass{}
+	for rows.Next() {
+		p, err := scanLanePass(rows.Scan)
+		if err != nil {
+			return nil, fmt.Errorf("scan latest lane pass: %w", err)
+		}
+		out = append(out, p)
+	}
+	return out, rows.Err()
+}
+
+// LanePassOutcomes sums the named outcomes for each Site at or after since.
+// The window boundary is supplied by the caller; the store has no clock.
+func (s *Store) LanePassOutcomes(since int64) ([]SiteOutcomes, error) {
+	rows, err := s.db.Query(`
+		SELECT site, SUM(refused), SUM(unreachable), SUM(no_chapter),
+		       SUM(unfetchable), SUM(errors)
+		FROM poll_passes
+		WHERE ran_at >= $1
+		GROUP BY site
+		ORDER BY site`, since)
+	if err != nil {
+		return nil, fmt.Errorf("query lane pass outcomes: %w", err)
+	}
+	defer rows.Close()
+
+	out := []SiteOutcomes{}
+	for rows.Next() {
+		var outcomes SiteOutcomes
+		if err := rows.Scan(
+			&outcomes.Site, &outcomes.Refused, &outcomes.Unreachable,
+			&outcomes.NoChapter, &outcomes.Unfetchable, &outcomes.Errors,
+		); err != nil {
+			return nil, fmt.Errorf("scan lane pass outcomes: %w", err)
+		}
+		out = append(out, outcomes)
+	}
+	return out, rows.Err()
+}
+
+// SetLaneRefusal persists a Site's refusal backoff stamp without touching its
+// pause. until is supplied by the caller's clock.
+func (s *Store) SetLaneRefusal(site string, until int64) error {
+	if _, err := s.db.Exec(`
+		INSERT INTO poll_lanes (site, refuse_until) VALUES ($1, $2)
+		ON CONFLICT (site) DO UPDATE SET refuse_until = EXCLUDED.refuse_until`, site, until); err != nil {
+		return fmt.Errorf("set lane refusal %s: %w", site, err)
+	}
+	return nil
+}
+
+// PauseLane persists a bounded pause. The caller must ensure until is after
+// its current timestamp; the store has no clock and rejects only the invalid
+// zero and negative sentinels.
+func (s *Store) PauseLane(site string, until int64) error {
+	if until <= 0 {
+		return fmt.Errorf("pause lane %s: expiry must be positive", site)
+	}
+	if _, err := s.db.Exec(`
+		INSERT INTO poll_lanes (site, paused_until) VALUES ($1, $2)
+		ON CONFLICT (site) DO UPDATE SET paused_until = EXCLUDED.paused_until`, site, until); err != nil {
+		return fmt.Errorf("pause lane %s: %w", site, err)
+	}
+	return nil
+}
+
+// ResumeLane clears only the pause stamp and keeps the Lane state row, along
+// with any refusal stamp already persisted on it.
+func (s *Store) ResumeLane(site string) error {
+	if _, err := s.db.Exec(
+		`UPDATE poll_lanes SET paused_until = 0 WHERE site = $1`, site); err != nil {
+		return fmt.Errorf("resume lane %s: %w", site, err)
+	}
+	return nil
+}
+
+// PausedLanes returns Lane rows with a nonzero pause stamp. Expiry comparison
+// stays with the caller because the store is deliberately clockless.
+func (s *Store) PausedLanes() ([]LanePause, error) {
+	rows, err := s.db.Query(`
+		SELECT site, paused_until
+		FROM poll_lanes
+		WHERE paused_until > 0
+		ORDER BY site`)
+	if err != nil {
+		return nil, fmt.Errorf("query paused lanes: %w", err)
+	}
+	defer rows.Close()
+
+	out := []LanePause{}
+	for rows.Next() {
+		var pause LanePause
+		if err := rows.Scan(&pause.Site, &pause.PausedUntil); err != nil {
+			return nil, fmt.Errorf("scan paused lane: %w", err)
+		}
+		out = append(out, pause)
+	}
+	return out, rows.Err()
+}
+
+// LanePausedUntil reads a Site's pause stamp. A missing state row is the
+// default unpaused state.
+func (s *Store) LanePausedUntil(site string) (int64, error) {
+	var until int64
+	err := s.db.QueryRow(`SELECT paused_until FROM poll_lanes WHERE site = $1`, site).Scan(&until)
+	if errors.Is(err, sql.ErrNoRows) {
+		return 0, nil
+	}
+	if err != nil {
+		return 0, fmt.Errorf("lane pause %s: %w", site, err)
+	}
+	return until, nil
+}
+
 // DueForLatestCheck returns one Site's series whose server-side
 // latest-chapter check has aged past cutoffMs, ordered by how many bookmarks
 // reference them (descending) then least-recently-checked first. One Site per

backend/internal/store/store_test.go

@@ -1584,3 +1584,148 @@ func TestCoverStoreAcceptsAnySourceURL(t *testing.T) {
 		t.Fatalf("rejected cover = found %v, err %v; want missing", ok, err)
 	}
 }
+func TestRecordLanePassPrunesBeforeInsertCutoff(t *testing.T) {
+	s := newTestStore(t)
+	for _, pass := range []LanePass{
+		{Site: "asura", RanAt: 99},
+		{Site: "asura", RanAt: 100},
+	} {
+		if err := s.RecordLanePass(pass, 100); err != nil {
+			t.Fatalf("RecordLanePass(%d): %v", pass.RanAt, err)
+		}
+	}
+
+	if err := s.RecordLanePass(LanePass{Site: "asura", RanAt: 200}, 100); err != nil {
+		t.Fatalf("RecordLanePass(200): %v", err)
+	}
+	var count int
+	if err := s.db.QueryRow(`SELECT count(*) FROM poll_passes WHERE site = $1`, "asura").Scan(&count); err != nil {
+		t.Fatalf("count passes: %v", err)
+	}
+	if count != 2 {
+		t.Fatalf("retained passes = %d, want 2", count)
+	}
+	if _, ok, err := s.LatestLanePass("asura"); err != nil || !ok {
+		t.Fatalf("LatestLanePass = ok %v, err %v; want latest row", ok, err)
+	}
+}
+
+func TestLatestLanePassesKeepsNewestPerSiteAndJoinsState(t *testing.T) {
+	s := newTestStore(t)
+	for _, pass := range []LanePass{
+		{Site: "asura", RanAt: 100, Due: 1},
+		{Site: "asura", RanAt: 200, Skip: "due-query", Due: 2, Checked: 3, GapMS: 4000, Clamped: true},
+		{Site: "demonic", RanAt: 150, Due: 4},
+	} {
+		if err := s.RecordLanePass(pass, -1); err != nil {
+			t.Fatalf("RecordLanePass(%s/%d): %v", pass.Site, pass.RanAt, err)
+		}
+	}
+	if err := s.PauseLane("asura", 1234); err != nil {
+		t.Fatalf("PauseLane: %v", err)
+	}
+	if err := s.SetLaneRefusal("asura", 5678); err != nil {
+		t.Fatalf("SetLaneRefusal: %v", err)
+	}
+
+	got, err := s.LatestLanePasses()
+	if err != nil {
+		t.Fatalf("LatestLanePasses: %v", err)
+	}
+	if len(got) != 2 {
+		t.Fatalf("latest passes = %d, want one per Site", len(got))
+	}
+	bySite := map[string]LanePass{}
+	for _, pass := range got {
+		bySite[pass.Site] = pass
+	}
+	asura := bySite["asura"]
+	if asura.RanAt != 200 || asura.Skip != "due-query" || asura.Due != 2 || asura.Checked != 3 || asura.GapMS != 4000 || !asura.Clamped ||
+		asura.PausedUntil != 1234 || asura.RefuseUntil != 5678 {
+		t.Fatalf("asura latest pass = %+v, want newest pass and joined state", asura)
+	}
+	if demonic := bySite["demonic"]; demonic.RanAt != 150 || demonic.Due != 4 {
+		t.Fatalf("demonic latest pass = %+v, want its only pass", demonic)
+	}
+}
+
+func TestLanePassOutcomesSumsWindow(t *testing.T) {
+	s := newTestStore(t)
+	for _, pass := range []LanePass{
+		{Site: "asura", RanAt: 99, Refused: 1, Unreachable: 2, NoChapter: 3, Unfetchable: 4, Errors: 5},
+		{Site: "asura", RanAt: 100, Refused: 2, Unreachable: 3, NoChapter: 4, Unfetchable: 5, Errors: 6},
+		{Site: "asura", RanAt: 200, Refused: 3, Unreachable: 4, NoChapter: 5, Unfetchable: 6, Errors: 7},
+		{Site: "demonic", RanAt: 150, Refused: 8, Unreachable: 9, NoChapter: 10, Unfetchable: 11, Errors: 12},
+	} {
+		if err := s.RecordLanePass(pass, -1); err != nil {
+			t.Fatalf("RecordLanePass(%s/%d): %v", pass.Site, pass.RanAt, err)
+		}
+	}
+
+	got, err := s.LanePassOutcomes(100)
+	if err != nil {
+		t.Fatalf("LanePassOutcomes: %v", err)
+	}
+	if len(got) != 2 {
+		t.Fatalf("outcome Sites = %d, want 2", len(got))
+	}
+	bySite := map[string]SiteOutcomes{}
+	for _, outcomes := range got {
+		bySite[outcomes.Site] = outcomes
+	}
+	if want := (SiteOutcomes{Site: "asura", Refused: 5, Unreachable: 7, NoChapter: 9, Unfetchable: 11, Errors: 13}); bySite["asura"] != want {
+		t.Fatalf("asura outcomes = %+v, want %+v", bySite["asura"], want)
+	}
+	if want := (SiteOutcomes{Site: "demonic", Refused: 8, Unreachable: 9, NoChapter: 10, Unfetchable: 11, Errors: 12}); bySite["demonic"] != want {
+		t.Fatalf("demonic outcomes = %+v, want %+v", bySite["demonic"], want)
+	}
+}
+
+func TestLaneStatePauseResumeAndRefusal(t *testing.T) {
+	s := newTestStore(t)
+	for _, until := range []int64{0, -1} {
+		if err := s.PauseLane("asura", until); err == nil {
+			t.Fatalf("PauseLane(%d) accepted a non-future expiry", until)
+		}
+	}
+	if err := s.PauseLane("asura", 2000); err != nil {
+		t.Fatalf("PauseLane: %v", err)
+	}
+	if err := s.SetLaneRefusal("asura", 3000); err != nil {
+		t.Fatalf("SetLaneRefusal: %v", err)
+	}
+	if err := s.RecordLanePass(LanePass{Site: "asura", RanAt: 1}, -1); err != nil {
+		t.Fatalf("RecordLanePass: %v", err)
+	}
+	if got, err := s.LanePausedUntil("asura"); err != nil || got != 2000 {
+		t.Fatalf("LanePausedUntil = %d, %v; want 2000", got, err)
+	}
+	paused, err := s.PausedLanes()
+	if err != nil {
+		t.Fatalf("PausedLanes: %v", err)
+	}
+	if len(paused) != 1 || paused[0] != (LanePause{Site: "asura", PausedUntil: 2000}) {
+		t.Fatalf("PausedLanes = %+v, want asura/2000", paused)
+	}
+
+	if err := s.ResumeLane("asura"); err != nil {
+		t.Fatalf("ResumeLane: %v", err)
+	}
+	latest, ok, err := s.LatestLanePass("asura")
+	if err != nil || !ok || latest.RefuseUntil != 3000 {
+		t.Fatalf("latest refusal after resume = %+v, ok=%v, err=%v; want 3000 preserved", latest, ok, err)
+	}
+	if got, err := s.LanePausedUntil("asura"); err != nil || got != 0 {
+		t.Fatalf("LanePausedUntil after resume = %d, %v; want 0", got, err)
+	}
+	if paused, err := s.PausedLanes(); err != nil || len(paused) != 0 {
+		t.Fatalf("PausedLanes after resume = %+v, %v; want empty", paused, err)
+	}
+	var rows int
+	if err := s.db.QueryRow(`SELECT count(*) FROM poll_lanes WHERE site = $1`, "asura").Scan(&rows); err != nil {
+		t.Fatalf("count lane state: %v", err)
+	}
+	if rows != 1 {
+		t.Fatalf("lane state rows after resume = %d, want 1", rows)
+	}
+}