登録番組の定期確認を追加（24 時間ごと、予告の除外、確認エラーの記録）

internal/store/subscriptions.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"time"
 
 	"github.com/jackc/pgx/v5"
 )
@@ -66,6 +67,95 @@ func (s *Store) QueueUnseenEpisodes(ctx context.Context, seriesID string, episod
 	return count, nil
 }
 
+// ListDueSubscriptions は有効で、cutoff 以前に確認された（または未確認の）番組を返す。
+func (s *Store) ListDueSubscriptions(ctx context.Context, cutoff time.Time) ([]Subscription, error) {
+	rows, err := s.pool.Query(ctx, `SELECT series_id, series_title, enabled, created_at, last_checked_at,
+		last_check_error_at, last_check_error, 0::bigint
+		FROM subscriptions
+		WHERE enabled AND (last_checked_at IS NULL OR last_checked_at <= $1)
+		ORDER BY last_checked_at ASC NULLS FIRST, created_at, series_id`, cutoff)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var result []Subscription
+	for rows.Next() {
+		var sub Subscription
+		if err := rows.Scan(&sub.SeriesID, &sub.SeriesTitle, &sub.Enabled, &sub.CreatedAt,
+			&sub.LastCheckedAt, &sub.LastCheckErrorAt, &sub.LastCheckError, &sub.JobCount); err != nil {
+			return nil, err
+		}
+		result = append(result, sub)
+	}
+	return result, rows.Err()
+}
+
+// CompleteSubscriptionCheck は全公開回を既知にし、しきい値を超える未確認回だけを投入する。
+// 最終確認日時の更新と前回エラーの消去も同じ取引で行う。
+func (s *Store) CompleteSubscriptionCheck(ctx context.Context, seriesID string, episodes []Episode, previewMaxSeconds int, checkedAt time.Time) (int, error) {
+	if previewMaxSeconds < 0 {
+		return 0, errors.New("preview threshold must not be negative")
+	}
+	tx, err := s.pool.Begin(ctx)
+	if err != nil {
+		return 0, err
+	}
+	defer tx.Rollback(ctx)
+	var enabled bool
+	err = tx.QueryRow(ctx, `SELECT enabled FROM subscriptions WHERE series_id=$1 FOR UPDATE`, seriesID).Scan(&enabled)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return 0, ErrInvalidTransition
+	}
+	if err != nil {
+		return 0, err
+	}
+	if !enabled {
+		return 0, ErrSubscriptionPaused
+	}
+	queued := 0
+	for _, ep := range episodes {
+		if ep.ID == "" || ep.SeriesID != seriesID || ep.DurationSeconds < 0 {
+			return 0, fmt.Errorf("invalid episode identity for series %s", seriesID)
+		}
+		var inserted string
+		err := tx.QueryRow(ctx, `INSERT INTO known_episodes (series_id, episode_id)
+			VALUES ($1,$2) ON CONFLICT DO NOTHING RETURNING episode_id`, seriesID, ep.ID).Scan(&inserted)
+		if errors.Is(err, pgx.ErrNoRows) {
+			continue
+		}
+		if err != nil {
+			return 0, err
+		}
+		if ep.DurationSeconds <= previewMaxSeconds {
+			continue
+		}
+		tag, err := tx.Exec(ctx, `INSERT INTO download_jobs
+			(episode_id, series_id, series_title, title, broadcaster_name, duration_seconds, end_at, thumbnail_path, source)
+			VALUES ($1,$2,$3,$4,$5,$6,$7,$8,'subscription')
+			ON CONFLICT (episode_id) DO NOTHING`, ep.ID, seriesID, ep.SeriesTitle, ep.Title,
+			ep.BroadcasterName, ep.DurationSeconds, ep.EndAt, ep.ThumbnailPath)
+		if err != nil {
+			return 0, err
+		}
+		queued += int(tag.RowsAffected())
+	}
+	if _, err := tx.Exec(ctx, `UPDATE subscriptions SET last_checked_at=$2,
+		last_check_error_at=NULL, last_check_error=NULL WHERE series_id=$1`, seriesID, checkedAt); err != nil {
+		return 0, err
+	}
+	if err := tx.Commit(ctx); err != nil {
+		return 0, err
+	}
+	return queued, nil
+}
+
+// RecordSubscriptionCheckFailure は取得失敗を記録し、最終確認日時は変更しない。
+func (s *Store) RecordSubscriptionCheckFailure(ctx context.Context, seriesID string, failedAt time.Time, message string) error {
+	tag, err := s.pool.Exec(ctx, `UPDATE subscriptions SET last_check_error_at=$2, last_check_error=$3
+		WHERE series_id=$1 AND enabled`, seriesID, failedAt, message)
+	return transitionResult(tag.RowsAffected(), err)
+}
+
 func addKnownAndMaybeQueue(ctx context.Context, tx pgx.Tx, seriesID string, episodes []Episode, queue bool) (int, error) {
 	count := 0
 	for _, ep := range episodes {