git.stella-ops.org/src/__Libraries/StellaOps.Provcache.Postgres/PostgresProvcacheRepository.DeleteFeedExpired.cs

using Microsoft.EntityFrameworkCore;
using System.Globalization;

namespace StellaOps.Provcache.Postgres;

public sealed partial class PostgresProvcacheRepository
{
    /// <inheritdoc />
    public async Task<long> DeleteByFeedEpochOlderThanAsync(string feedEpoch, CancellationToken cancellationToken = default)
    {
        var deleted = await _context.ProvcacheItems
            .Where(e => string.Compare(e.FeedEpoch, feedEpoch) < 0)
            .ExecuteDeleteAsync(cancellationToken)
            .ConfigureAwait(false);

        if (deleted > 0)
        {
            await LogRevocationAsync("feed", feedEpoch, "feed-update", deleted, cancellationToken)
                .ConfigureAwait(false);
        }

        return deleted;
    }

    /// <inheritdoc />
    public async Task<long> DeleteExpiredAsync(DateTimeOffset asOf, CancellationToken cancellationToken = default)
    {
        var deleted = await _context.ProvcacheItems
            .Where(e => e.ExpiresAt <= asOf)
            .ExecuteDeleteAsync(cancellationToken)
            .ConfigureAwait(false);

        if (deleted > 0)
        {
            await LogRevocationAsync(
                    "expired",
                    asOf.ToString("O", CultureInfo.InvariantCulture),
                    "ttl-expiry",
                    deleted,
                    cancellationToken)
                .ConfigureAwait(false);
        }

        return deleted;
    }
}