feat: add batch watchlist and command palette db queries

internal/db/watchlist_ids.go

@@ -0,0 +1,58 @@
+package db
+
+import (
+	"context"
+	"strings"
+)
+
+func (q *Queries) GetUserWatchlistAnimeIDs(ctx context.Context, userID string, animeIDs []int64) ([]int64, error) {
+	animeIDs = uniquePositiveIDs(animeIDs)
+	if userID == "" || len(animeIDs) == 0 {
+		return nil, nil
+	}
+
+	placeholders := strings.TrimRight(strings.Repeat("?,", len(animeIDs)), ",")
+	query := "SELECT anime_id FROM watch_list_entry WHERE user_id = ? AND anime_id IN (" + placeholders + ") ORDER BY anime_id"
+
+	args := make([]any, 0, len(animeIDs)+1)
+	args = append(args, userID)
+	for _, animeID := range animeIDs {
+		args = append(args, animeID)
+	}
+
+	rows, err := q.db.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	matches := make([]int64, 0, len(animeIDs))
+	for rows.Next() {
+		var animeID int64
+		if err := rows.Scan(&animeID); err != nil {
+			return nil, err
+		}
+		matches = append(matches, animeID)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return matches, nil
+}
+
+func uniquePositiveIDs(ids []int64) []int64 {
+	seen := make(map[int64]struct{}, len(ids))
+	unique := make([]int64, 0, len(ids))
+	for _, id := range ids {
+		if id <= 0 {
+			continue
+		}
+		if _, ok := seen[id]; ok {
+			continue
+		}
+		seen[id] = struct{}{}
+		unique = append(unique, id)
+	}
+	return unique
+}