Audit und Laufbelege: Tageswerte je Agent und Einheit, Monatsarchiv statt Loeschen (#700)

Nach der Vorgabe vom 2026-09-22 (so wenig loeschen wie moeglich): Laeufe
aelter als hotDays (Vorgabe 180, 0 = alles bleibt) wandern aus AuditLog und
RunReceipts in Archive/audit-JJJJ-MM.db - kopiert und entfernt in einer
Transaktion, Zeilen-IDs bleiben, spaeter dazugekommene Spalten werden im
Archiv ergaenzt. Vorher wird jeder Tag in RunDaily verdichtet (Laeufe,
Fehlschlaege, Schrittgrenze, Tokens, Kosten, Werkzeugaufrufe, Fehler,
Verweigert, Freigaben) mit der Einheit des Agenten; die Tageswerte bleiben.
Nachschlagen eines Laufs findet ihn auch im Archiv. API /usage/days,
/usage/archive; Karte 'Tageswerte' in der Verbrauchsansicht.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ClawdDotNet.App/AppHost.cs

@@ -141,6 +141,9 @@ public sealed class AppHost : IAsyncDisposable
     /// <summary>#725: Inbound triggers — n8n or any other system hands an agent a task.</summary>
     public Core.Triggers.InboundTriggers? Triggers { get; private set; }
 
+    /// <summary>#700: Day values and the month archive of audit and receipts.</summary>
+    public Core.Audit.AuditArchive? AuditArchive { get; private set; }
+
     /// <summary>#197: The external MCP servers, each registered as a tool.</summary>
     public Core.Mcp.McpConnections? McpServers { get; private set; }
 
@@ -724,6 +727,15 @@ public sealed class AppHost : IAsyncDisposable
         historyKeeper.Start();
         host._shutdown.Add(historyKeeper.DisposeAsync);
 
+        // #700: day values, and runs older than the hot window move to the month archive.
+        var auditArchive = new Core.Audit.AuditArchive(
+            storage, () => instance.AuditArchive,
+            agentId => instance.Agents.FirstOrDefault(a => string.Equals(a.AgentId, agentId, StringComparison.OrdinalIgnoreCase))?.UnitId,
+            loggerFactory.CreateLogger("ClawdDotNet.Core.Audit"));
+        auditArchive.Start();
+        host.AuditArchive = auditArchive;
+        host._shutdown.Add(auditArchive.DisposeAsync);
+
         // #698: what holds in a unit, set by its lead.
         var doctrines = new Core.Organisation.SqliteDoctrineStore(storage);
         engine.Doctrines = doctrines;

src/ClawdDotNet.Core/Audit/AuditArchive.cs

@@ -0,0 +1,388 @@
+using System.Globalization;
+using System.Text.Json.Serialization;
+using ClawdDotNet.Core.Storage;
+using Microsoft.Data.Sqlite;
+using Microsoft.Extensions.Logging;
+
+namespace ClawdDotNet.Core.Audit;
+
+/// <summary>#700: How long audit and receipts stay in the working database (<c>auditArchive</c> in the instance settings).</summary>
+public sealed class AuditArchiveSettings
+{
+    /// <summary>
+    /// Days a run stays in the working database; older ones move to the monthly archive.
+    /// 0 keeps everything in the working database. Nothing is ever deleted either way.
+    /// </summary>
+    [JsonPropertyName("hotDays")]
+    public int HotDays { get; set; } = 180;
+}
+
+/// <summary>#700: One day of one agent, condensed — stays in the working database for good.</summary>
+public sealed record RunDay(
+    string Day, string AgentId, string UnitId, int Runs, int Failed, int LoopLimit,
+    long PromptTokens, long CompletionTokens, decimal CostUsd, int ToolCalls, int ToolErrors, int Denied, int Staged);
+
+/// <summary>An archive file as the administration shows it.</summary>
+public sealed record AuditArchiveFile(string Month, string FileName, long Bytes);
+
+/// <summary>
+/// #700: The audit is evidence, and evidence is kept — the user's decision of 2026-09-22: as
+/// little deleted as possible. Five years after a failed project, how it came about can be read:
+/// which task was worded how, what the agent read, who approved what. That is the one real
+/// advantage an organisation of agents has over one of people.
+///
+/// <para><b>What grows is the working table, not the disk.</b> A hundred agents write some
+/// 7,400 audit rows a day; every supervision and every view reads those tables. So rows older
+/// than <see cref="AuditArchiveSettings.HotDays"/> move — never get deleted — into one SQLite
+/// file per month under <c>Archive/</c>, which the backup takes along like any other file.
+/// Looking up a run finds them there.</para>
+///
+/// <para><b>Day values stay.</b> Before rows move, each day is condensed per agent and unit
+/// (<see cref="RunDay"/>): runs, failures, tokens, costs, tool calls. Most questions over months
+/// are answered from those, without opening an archive. The unit is taken when the day is
+/// condensed — later "what did marketing cost in March" cannot be answered otherwise.</para>
+/// </summary>
+public sealed class AuditArchive(
+    SqliteStorage storage,
+    Func<AuditArchiveSettings> settings,
+    Func<string, string?> unitOf,
+    ILogger logger,
+    TimeProvider? clock = null) : IAsyncDisposable
+{
+    public const string FolderName = "Archive";
+
+    private readonly TimeProvider _clock = clock ?? TimeProvider.System;
+
+    public string Directory => ArchiveDirectoryOf(storage);
+
+    public static string ArchiveDirectoryOf(SqliteStorage storage)
+        => Path.Combine(Path.GetDirectoryName(Path.GetFullPath(storage.DatabasePath))!, FolderName);
+
+    public static string FileNameOf(string month) => $"audit-{month}.db";
+
+    private DateTime Now => _clock.GetUtcNow().UtcDateTime;
+
+    // ─── Day values ───
+
+    /// <summary>
+    /// Condenses every day before today that is not condensed yet — and the last two again,
+    /// because a run can end after midnight. Days are UTC days.
+    /// </summary>
+    public async Task<int> CondenseAsync(CancellationToken ct)
+    {
+        var today = Now.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture);
+        return await storage.WriteAsync(async conn =>
+        {
+            string? last;
+            using (var max = conn.CreateCommand())
+            {
+                max.CommandText = "SELECT MAX(Day) FROM RunDaily";
+                last = await max.ExecuteScalarAsync(ct) as string;
+            }
+            var from = last is null ? "" : DateOnly.ParseExact(last, "yyyy-MM-dd", CultureInfo.InvariantCulture).AddDays(-1).ToString("yyyy-MM-dd", CultureInfo.InvariantCulture);
+
+            var days = new Dictionary<(string Day, string Agent), RunDayBuilder>();
+            using (var receipts = conn.CreateCommand())
+            {
+                receipts.CommandText = """
+                    SELECT substr(OccurredAt, 1, 10) AS Day, AgentId,
+                           SUM(CASE WHEN Status IN ('BudgetExceeded', 'TargetBusy', 'ShuttingDown') THEN 0 ELSE 1 END),
+                           SUM(CASE WHEN Status IN ('Failed', 'Cancelled', 'Incomplete') THEN 1 ELSE 0 END),
+                           SUM(CASE WHEN Status = 'LoopLimitExceeded' THEN 1 ELSE 0 END),
+                           SUM(PromptTokens), SUM(CompletionTokens), GROUP_CONCAT(CostUsd, ';')
+                    FROM RunReceipts
+                    WHERE substr(OccurredAt, 1, 10) >= @from AND substr(OccurredAt, 1, 10) < @today
+                    GROUP BY Day, AgentId
+                    """;
+                receipts.Parameters.AddWithValue("@from", from);
+                receipts.Parameters.AddWithValue("@today", today);
+                await using var r = await receipts.ExecuteReaderAsync(ct);
+                while (await r.ReadAsync(ct))
+                {
+                    var b = Builder(days, r.GetString(0), r.GetString(1));
+                    b.Runs = r.GetInt32(2);
+                    b.Failed = r.GetInt32(3);
+                    b.LoopLimit = r.GetInt32(4);
+                    b.PromptTokens = r.GetInt64(5);
+                    b.CompletionTokens = r.GetInt64(6);
+                    b.CostUsd = r.IsDBNull(7) ? 0m : r.GetString(7).Split(';').Sum(c =>
+                        decimal.TryParse(c, NumberStyles.Any, CultureInfo.InvariantCulture, out var v) ? v : 0m);
+                }
+            }
+            using (var audit = conn.CreateCommand())
+            {
+                audit.CommandText = """
+                    SELECT substr(OccurredAt, 1, 10) AS Day, AgentId,
+                           SUM(CASE WHEN Status NOT IN ('Started', 'Staged', 'Denied') THEN 1 ELSE 0 END),
+                           SUM(CASE WHEN Status = 'Error' THEN 1 ELSE 0 END),
+                           SUM(CASE WHEN Status = 'Denied' THEN 1 ELSE 0 END),
+                           SUM(CASE WHEN Status = 'Staged' THEN 1 ELSE 0 END)
+                    FROM AuditLog
+                    WHERE substr(OccurredAt, 1, 10) >= @from AND substr(OccurredAt, 1, 10) < @today AND AgentId <> ''
+                    GROUP BY Day, AgentId
+                    """;
+                audit.Parameters.AddWithValue("@from", from);
+                audit.Parameters.AddWithValue("@today", today);
+                await using var r = await audit.ExecuteReaderAsync(ct);
+                while (await r.ReadAsync(ct))
+                {
+                    var b = Builder(days, r.GetString(0), r.GetString(1));
+                    b.ToolCalls = r.GetInt32(2);
+                    b.ToolErrors = r.GetInt32(3);
+                    b.Denied = r.GetInt32(4);
+                    b.Staged = r.GetInt32(5);
+                }
+            }
+
+            foreach (var ((day, agent), b) in days)
+            {
+                using var upsert = conn.CreateCommand();
+                upsert.CommandText = """
+                    INSERT INTO RunDaily (Day, AgentId, UnitId, Runs, Failed, LoopLimit, PromptTokens, CompletionTokens,
+                                          CostUsd, ToolCalls, ToolErrors, Denied, Staged)
+                    VALUES (@day, @agent, @unit, @runs, @failed, @loop, @prompt, @completion, @cost, @calls, @errors, @denied, @staged)
+                    ON CONFLICT (Day, AgentId) DO UPDATE SET
+                        Runs = excluded.Runs, Failed = excluded.Failed, LoopLimit = excluded.LoopLimit,
+                        PromptTokens = excluded.PromptTokens, CompletionTokens = excluded.CompletionTokens,
+                        CostUsd = excluded.CostUsd, ToolCalls = excluded.ToolCalls, ToolErrors = excluded.ToolErrors,
+                        Denied = excluded.Denied, Staged = excluded.Staged
+                    """;
+                // The unit stays what it was when the day was first condensed.
+                upsert.Parameters.AddWithValue("@day", day);
+                upsert.Parameters.AddWithValue("@agent", agent);
+                upsert.Parameters.AddWithValue("@unit", unitOf(agent) ?? "");
+                upsert.Parameters.AddWithValue("@runs", b.Runs);
+                upsert.Parameters.AddWithValue("@failed", b.Failed);
+                upsert.Parameters.AddWithValue("@loop", b.LoopLimit);
+                upsert.Parameters.AddWithValue("@prompt", b.PromptTokens);
+                upsert.Parameters.AddWithValue("@completion", b.CompletionTokens);
+                upsert.Parameters.AddWithValue("@cost", b.CostUsd.ToString(CultureInfo.InvariantCulture));
+                upsert.Parameters.AddWithValue("@calls", b.ToolCalls);
+                upsert.Parameters.AddWithValue("@errors", b.ToolErrors);
+                upsert.Parameters.AddWithValue("@denied", b.Denied);
+                upsert.Parameters.AddWithValue("@staged", b.Staged);
+                await upsert.ExecuteNonQueryAsync(ct);
+            }
+            return days.Count;
+        }, ct);
+    }
+
+    private sealed class RunDayBuilder
+    {
+        public int Runs, Failed, LoopLimit, ToolCalls, ToolErrors, Denied, Staged;
+        public long PromptTokens, CompletionTokens;
+        public decimal CostUsd;
+    }
+
+    private static RunDayBuilder Builder(Dictionary<(string, string), RunDayBuilder> days, string day, string agent)
+    {
+        if (!days.TryGetValue((day, agent), out var b))
+            days[(day, agent)] = b = new RunDayBuilder();
+        return b;
+    }
+
+    /// <summary>Day values in a range (inclusive), optionally for one agent or one unit.</summary>
+    public async Task<IReadOnlyList<RunDay>> DaysAsync(DateOnly from, DateOnly to, string? agentId, string? unitId, CancellationToken ct)
+    {
+        await using var conn = await storage.OpenConnectionAsync(ct);
+        using var cmd = conn.CreateCommand();
+        cmd.CommandText = """
+            SELECT Day, AgentId, UnitId, Runs, Failed, LoopLimit, PromptTokens, CompletionTokens, CostUsd,
+                   ToolCalls, ToolErrors, Denied, Staged
+            FROM RunDaily
+            WHERE Day >= @from AND Day <= @to
+              AND (@agent IS NULL OR AgentId = @agent COLLATE NOCASE)
+              AND (@unit IS NULL OR UnitId = @unit COLLATE NOCASE)
+            ORDER BY Day, AgentId
+            """;
+        cmd.Parameters.AddWithValue("@from", from.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture));
+        cmd.Parameters.AddWithValue("@to", to.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture));
+        cmd.Parameters.AddWithValue("@agent", (object?)agentId ?? DBNull.Value);
+        cmd.Parameters.AddWithValue("@unit", (object?)unitId ?? DBNull.Value);
+        var result = new List<RunDay>();
+        await using var r = await cmd.ExecuteReaderAsync(ct);
+        while (await r.ReadAsync(ct))
+            result.Add(new RunDay(r.GetString(0), r.GetString(1), r.GetString(2), r.GetInt32(3), r.GetInt32(4), r.GetInt32(5),
+                r.GetInt64(6), r.GetInt64(7),
+                decimal.TryParse(r.GetString(8), NumberStyles.Any, CultureInfo.InvariantCulture, out var c) ? c : 0m,
+                r.GetInt32(9), r.GetInt32(10), r.GetInt32(11), r.GetInt32(12)));
+        return result;
+    }
+
+    // ─── Moving to the archive ───
+
+    /// <summary>
+    /// Moves audit rows and receipts older than the hot window into their month's archive file.
+    /// Days are condensed first, so no day value is lost with the move. Copy and delete happen
+    /// in one transaction: a row is in one place or the other, never in none.
+    /// </summary>
+    public async Task<int> ArchiveAsync(CancellationToken ct)
+    {
+        var hotDays = settings().HotDays;
+        if (hotDays <= 0)
+            return 0;
+        await CondenseAsync(ct);
+
+        // Whole days only, and never today's or yesterday's: those are not condensed for good yet.
+        var cutoff = Now.Date.AddDays(-Math.Max(2, hotDays)).ToString("O");
+        System.IO.Directory.CreateDirectory(Directory);
+
+        return await storage.WriteAsync(async conn =>
+        {
+            var months = new SortedSet<string>(StringComparer.Ordinal);
+            foreach (var table in new[] { "AuditLog", "RunReceipts" })
+            {
+                using var cmd = conn.CreateCommand();
+                cmd.CommandText = $"SELECT DISTINCT substr(OccurredAt, 1, 7) FROM {table} WHERE OccurredAt < @cutoff";
+                cmd.Parameters.AddWithValue("@cutoff", cutoff);
+                await using var r = await cmd.ExecuteReaderAsync(ct);
+                while (await r.ReadAsync(ct))
+                    months.Add(r.GetString(0));
+            }
+
+            var moved = 0;
+            foreach (var month in months)
+                moved += await MoveMonthAsync(conn, month, cutoff, ct);
+            if (moved > 0)
+                logger.LogInformation("Audit archive: {Count} row(s) older than {Days} days moved to {Folder}", moved, hotDays, Directory);
+            return moved;
+        }, ct);
+    }
+
+    private async Task<int> MoveMonthAsync(SqliteConnection conn, string month, string cutoff, CancellationToken ct)
+    {
+        var file = Path.Combine(Directory, FileNameOf(month));
+        using (var attach = conn.CreateCommand())
+        {
+            attach.CommandText = "ATTACH DATABASE @file AS arch";
+            attach.Parameters.AddWithValue("@file", file);
+            await attach.ExecuteNonQueryAsync(ct);
+        }
+        try
+        {
+            using (var create = conn.CreateCommand())
+            {
+                // Same columns as the working tables, row ids kept — an id in a report still finds its row.
+                create.CommandText = """
+                    CREATE TABLE IF NOT EXISTS arch.AuditLog AS SELECT * FROM main.AuditLog WHERE 0;
+                    CREATE TABLE IF NOT EXISTS arch.RunReceipts AS SELECT * FROM main.RunReceipts WHERE 0;
+                    CREATE INDEX IF NOT EXISTS arch.IX_Archive_AuditLog_Run ON AuditLog (RunId);
+                    CREATE INDEX IF NOT EXISTS arch.IX_Archive_RunReceipts_Run ON RunReceipts (RunId);
+                    CREATE INDEX IF NOT EXISTS arch.IX_Archive_RunReceipts_Task ON RunReceipts (TaskId);
+                    """;
+                await create.ExecuteNonQueryAsync(ct);
+            }
+
+            // A column the working table gained after the archive file was made is added to it —
+            // otherwise the month's next move would fail on a column count.
+            var columns = new Dictionary<string, IReadOnlyList<string>>();
+            foreach (var table in new[] { "AuditLog", "RunReceipts" })
+                columns[table] = await AlignColumnsAsync(conn, table, ct);
+
+            await using var tx = await conn.BeginTransactionAsync(ct);
+            var moved = 0;
+            foreach (var table in new[] { "AuditLog", "RunReceipts" })
+            {
+                var list = string.Join(", ", columns[table]);
+                using var copy = conn.CreateCommand();
+                copy.Transaction = (SqliteTransaction)tx;
+                copy.CommandText = $"""
+                    INSERT INTO arch.{table} ({list}) SELECT {list} FROM main.{table}
+                    WHERE OccurredAt < @cutoff AND substr(OccurredAt, 1, 7) = @month
+                      AND Id NOT IN (SELECT Id FROM arch.{table});
+                    DELETE FROM main.{table} WHERE OccurredAt < @cutoff AND substr(OccurredAt, 1, 7) = @month
+                      AND Id IN (SELECT Id FROM arch.{table});
+                    """;
+                copy.Parameters.AddWithValue("@cutoff", cutoff);
+                copy.Parameters.AddWithValue("@month", month);
+                moved += await copy.ExecuteNonQueryAsync(ct) / 2;
+            }
+            await tx.CommitAsync(ct);
+            return moved;
+        }
+        finally
+        {
+            using var detach = conn.CreateCommand();
+            detach.CommandText = "DETACH DATABASE arch";
+            await detach.ExecuteNonQueryAsync(CancellationToken.None);
+        }
+    }
+
+    /// <summary>The working table's columns, each present in the archive table too.</summary>
+    private static async Task<IReadOnlyList<string>> AlignColumnsAsync(SqliteConnection conn, string table, CancellationToken ct)
+    {
+        async Task<List<(string Name, string Type)>> Columns(string schema)
+        {
+            using var cmd = conn.CreateCommand();
+            cmd.CommandText = $"SELECT name, type FROM pragma_table_info('{table}', '{schema}')";
+            var list = new List<(string, string)>();
+            await using var r = await cmd.ExecuteReaderAsync(ct);
+            while (await r.ReadAsync(ct))
+                list.Add((r.GetString(0), r.GetString(1)));
+            return list;
+        }
+
+        var main = await Columns("main");
+        var archived = (await Columns("arch")).Select(c => c.Name).ToHashSet(StringComparer.OrdinalIgnoreCase);
+        foreach (var (name, type) in main.Where(c => !archived.Contains(c.Name)))
+        {
+            using var add = conn.CreateCommand();
+            add.CommandText = $"ALTER TABLE arch.{table} ADD COLUMN {name} {type}";
+            await add.ExecuteNonQueryAsync(ct);
+        }
+        return main.Select(c => c.Name).ToList();
+    }
+
+    /// <summary>The archive files, newest month first.</summary>
+    public IReadOnlyList<AuditArchiveFile> Files() => FilesIn(Directory);
+
+    private readonly CancellationTokenSource _cts = new();
+    private Task? _loop;
+
+    /// <summary>Condenses and archives once after the start, then every six hours.</summary>
+    public void Start() => _loop ??= LoopAsync(_cts.Token);
+
+    private async Task LoopAsync(CancellationToken ct)
+    {
+        try { await Task.Delay(TimeSpan.FromMinutes(2), ct); }
+        catch (OperationCanceledException) { return; }
+
+        while (!ct.IsCancellationRequested)
+        {
+            try
+            {
+                await ArchiveAsync(ct);
+                if (settings().HotDays <= 0)
+                    await CondenseAsync(ct);
+            }
+            catch (Exception ex) when (ex is not OperationCanceledException)
+            {
+                logger.LogWarning(ex, "Audit archive: condensing or moving failed");
+            }
+
+            try { await Task.Delay(TimeSpan.FromHours(6), ct); }
+            catch (OperationCanceledException) { return; }
+        }
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        await _cts.CancelAsync();
+        if (_loop is not null)
+        {
+            try { await _loop; }
+            catch (OperationCanceledException) { }
+        }
+        _cts.Dispose();
+    }
+
+    public static IReadOnlyList<AuditArchiveFile> FilesIn(string directory)
+    {
+        if (!System.IO.Directory.Exists(directory))
+            return [];
+        return System.IO.Directory.EnumerateFiles(directory, "audit-????-??.db")
+            .Select(f => new AuditArchiveFile(Path.GetFileNameWithoutExtension(f)["audit-".Length..], Path.GetFileName(f), new FileInfo(f).Length))
+            .OrderByDescending(f => f.Month, StringComparer.Ordinal)
+            .ToList();
+    }
+}

src/ClawdDotNet.Core/Audit/SqliteAuditRepository.cs

@@ -83,22 +83,72 @@ public sealed class SqliteAuditRepository : IAuditRepository
 
     public async Task<IReadOnlyList<AuditEntry>> ListForRunAsync(string runId, CancellationToken ct)
     {
-        await using var conn = await _storage.OpenConnectionAsync(ct);
+        await using (var conn = await _storage.OpenConnectionAsync(ct))
-        using var cmd = conn.CreateCommand();
+        {
-        cmd.CommandText = "SELECT " + AuditColumns + " FROM AuditLog WHERE RunId = @runId ORDER BY Id";
+            using var cmd = conn.CreateCommand();
-        cmd.Parameters.AddWithValue("@runId", runId);
+            cmd.CommandText = "SELECT " + AuditColumns + " FROM AuditLog WHERE RunId = @runId ORDER BY Id";
-        return await ReadEntriesAsync(cmd, ct);
+            cmd.Parameters.AddWithValue("@runId", runId);
+            var hot = await ReadEntriesAsync(cmd, ct);
+            if (hot.Count > 0)
+                return hot;
+        }
+
+        // #700: an older run moved to the archive — it is still evidence and still found.
+        foreach (var archive in ArchiveConnections())
+            await using (archive)
+            {
+                using var cmd = archive.CreateCommand();
+                cmd.CommandText = "SELECT " + AuditColumns + " FROM AuditLog WHERE RunId = @runId ORDER BY Id";
+                cmd.Parameters.AddWithValue("@runId", runId);
+                var found = await ReadEntriesAsync(cmd, ct);
+                if (found.Count > 0)
+                    return found;
+            }
+        return [];
     }
 
     public async Task<RunReceipt?> GetReceiptForRunAsync(string runId, CancellationToken ct)
     {
-        await using var conn = await _storage.OpenConnectionAsync(ct);
+        await using (var conn = await _storage.OpenConnectionAsync(ct))
-        using var cmd = conn.CreateCommand();
+        {
-        cmd.CommandText = "SELECT " + ReceiptColumns + " FROM RunReceipts WHERE RunId = @runId ORDER BY Id DESC LIMIT 1";
+            using var cmd = conn.CreateCommand();
-        cmd.Parameters.AddWithValue("@runId", runId);
+            cmd.CommandText = "SELECT " + ReceiptColumns + " FROM RunReceipts WHERE RunId = @runId ORDER BY Id DESC LIMIT 1";
+            cmd.Parameters.AddWithValue("@runId", runId);
+            await using var reader = await cmd.ExecuteReaderAsync(ct);
+            if (await reader.ReadAsync(ct))
+                return ReadReceipt(reader);
+        }
 
-        await using var reader = await cmd.ExecuteReaderAsync(ct);
+        foreach (var archive in ArchiveConnections())
-        return await reader.ReadAsync(ct) ? ReadReceipt(reader) : null;
+            await using (archive)
+            {
+                using var cmd = archive.CreateCommand();
+                cmd.CommandText = "SELECT " + ReceiptColumns + " FROM RunReceipts WHERE RunId = @runId ORDER BY Id DESC LIMIT 1";
+                cmd.Parameters.AddWithValue("@runId", runId);
+                await using var reader = await cmd.ExecuteReaderAsync(ct);
+                if (await reader.ReadAsync(ct))
+                    return ReadReceipt(reader);
+            }
+        return null;
+    }
+
+    /// <summary>
+    /// #700: The month archives, newest first, opened read-only one at a time. A lookup by run
+    /// is rare and asks for one run — opening a few small files for it is cheap.
+    /// </summary>
+    private IEnumerable<SqliteConnection> ArchiveConnections()
+    {
+        foreach (var file in AuditArchive.FilesIn(AuditArchive.ArchiveDirectoryOf(_storage)))
+        {
+            var connection = new SqliteConnection(new SqliteConnectionStringBuilder
+            {
+                DataSource = Path.Combine(AuditArchive.ArchiveDirectoryOf(_storage), file.FileName),
+                Mode = SqliteOpenMode.ReadOnly,
+                Pooling = false
+            }.ToString());
+            connection.Open();
+            yield return connection;
+        }
     }
 
     public async Task<IReadOnlyList<RunReceipt>> ListReceiptsAsync(DateTime fromUtc, DateTime toUtc, int limit, CancellationToken ct)

src/ClawdDotNet.Core/Config/InstanceConfig.cs

@@ -155,6 +155,10 @@ public sealed class InstanceConfig
     [JsonPropertyName("claudeCode")]
     public Runtimes.ClaudeCodeSettings ClaudeCode { get; set; } = new();
 
+    /// <summary>#700: How long runs stay in the working database before they move to the month archive — nothing is deleted.</summary>
+    [JsonPropertyName("auditArchive")]
+    public Audit.AuditArchiveSettings AuditArchive { get; set; } = new();
+
     /// <summary>#719: The history of the workspaces — on by default, 90 days.</summary>
     [JsonPropertyName("fileHistory")]
     public Files.FileHistorySettings FileHistory { get; set; } = new();

src/ClawdDotNet.Core/Storage/SqliteStorage.cs

@@ -282,6 +282,26 @@ public sealed class SqliteStorage
             CREATE INDEX IF NOT EXISTS IX_RunReceipts_Run
                 ON RunReceipts (RunId);
 
+            -- #700: one day of one agent, condensed; stays when the rows move to the archive.
+            CREATE TABLE IF NOT EXISTS RunDaily (
+                Day              TEXT    NOT NULL,
+                AgentId          TEXT    NOT NULL,
+                UnitId           TEXT    NOT NULL DEFAULT '',
+                Runs             INTEGER NOT NULL DEFAULT 0,
+                Failed           INTEGER NOT NULL DEFAULT 0,
+                LoopLimit        INTEGER NOT NULL DEFAULT 0,
+                PromptTokens     INTEGER NOT NULL DEFAULT 0,
+                CompletionTokens INTEGER NOT NULL DEFAULT 0,
+                CostUsd          TEXT    NOT NULL DEFAULT '0',
+                ToolCalls        INTEGER NOT NULL DEFAULT 0,
+                ToolErrors       INTEGER NOT NULL DEFAULT 0,
+                Denied           INTEGER NOT NULL DEFAULT 0,
+                Staged           INTEGER NOT NULL DEFAULT 0,
+                PRIMARY KEY (Day, AgentId)
+            );
+
+            CREATE INDEX IF NOT EXISTS IX_RunDaily_Unit ON RunDaily (UnitId, Day);
+
             -- Staging (A2): eingefrorene, freigabepflichtige Tool-Aufrufe. Ausgeführt wird
             -- genau der gespeicherte Argument-JSON (Plan-Freeze).
             -- #698: a unit's doctrine, every version kept — who, when, which run, why.

src/ClawdDotNet.Manager.Web/wwwroot/i18n/de.json

@@ -796,6 +796,22 @@
   "usage.units.kind.Deviation": "Ungewöhnlicher Tag",
   "usage.units.kind.NearLimit": "Nahe an den Grenzen",
   "usage.units.kind.MonthlyThreshold": "Monatssumme überschritten",
+  "usage.days.title": "Tageswerte",
+  "usage.days.hint": "Die letzten 30 Tage, summiert über alle Agenten (UTC-Tage). Jeder Tag wird je Agent und Einheit verdichtet und bleibt für immer — auch wenn seine Läufe ins Archiv wandern. Heute erscheint morgen.",
+  "usage.days.none": "Noch kein Tag verdichtet — die ersten Werte erscheinen wenige Minuten nach dem Start, ab gestern.",
+  "usage.days.day": "Tag",
+  "usage.days.runs": "Läufe",
+  "usage.days.failed": "Gescheitert",
+  "usage.days.loopLimit": "Schrittgrenze",
+  "usage.days.cost": "Kosten",
+  "usage.days.calls": "Werkzeugaufrufe",
+  "usage.days.errors": "Werkzeugfehler",
+  "usage.days.staged": "Zur Freigabe",
+  "usage.archive.title": "Archiv",
+  "usage.archive.hint": "Audit-Einträge und Laufbelege sind Belege und werden nie gelöscht. Nach so vielen Tagen wandern sie aus der Arbeitsdatenbank in eine Archivdatei je Monat; ein Lauf wird dort weiterhin gefunden. 0 behält alles in der Arbeitsdatenbank.",
+  "usage.archive.hotDays": "Tage in der Arbeitsdatenbank",
+  "usage.archive.none": "Noch keine Archivdatei.",
+  "usage.archive.files": "Archivdateien: {list}",
   "usage.forecastTitle": "Kostenprognose",
   "usage.forecastDay": "Prognose je Tag",
   "usage.forecastMonth": "Prognose je Monat (30 Tage)",

src/ClawdDotNet.Manager.Web/wwwroot/i18n/en.json

@@ -796,6 +796,22 @@
   "usage.units.kind.Deviation": "Unusual day",
   "usage.units.kind.NearLimit": "Near the limits",
   "usage.units.kind.MonthlyThreshold": "Monthly total crossed",
+  "usage.days.title": "Day values",
+  "usage.days.hint": "The last 30 days, summed over all agents (UTC days). Each day is condensed per agent and unit and stays for good — also when its runs move to the archive. Today appears tomorrow.",
+  "usage.days.none": "No day condensed yet — the first values appear a few minutes after the start, from yesterday on.",
+  "usage.days.day": "Day",
+  "usage.days.runs": "Runs",
+  "usage.days.failed": "Failed",
+  "usage.days.loopLimit": "Step limit",
+  "usage.days.cost": "Cost",
+  "usage.days.calls": "Tool calls",
+  "usage.days.errors": "Tool errors",
+  "usage.days.staged": "For approval",
+  "usage.archive.title": "Archive",
+  "usage.archive.hint": "Audit entries and receipts are evidence and are never deleted. After this many days they move from the working database into one archive file per month; a run is still found there. 0 keeps everything in the working database.",
+  "usage.archive.hotDays": "Days in the working database",
+  "usage.archive.none": "No archive file yet.",
+  "usage.archive.files": "Archive files: {list}",
   "usage.forecastTitle": "Cost Forecast",
   "usage.forecastDay": "Forecast per day",
   "usage.forecastMonth": "Forecast per month (30 days)",

src/ClawdDotNet.Manager.Web/wwwroot/views/usage.js

@@ -13,7 +13,8 @@ import {
   erstelleKarte,
   formatiereDatumZeit,
   formatiereTokens,
-  formatiereKosten
+  formatiereKosten,
+  zeigeMeldung
 } from "../modules/dom.js";
 
 export async function rendereVerbrauch() {
@@ -44,10 +45,11 @@ async function ladeVerbrauch() {
   );
 
   try {
-    const [laeufe, prognose, einheiten] = await Promise.all([api("/usage?limit=100"), erstellePrognoseKarte(), erstelleEinheitenKarte()]);
+    const [laeufe, prognose, einheiten, tage] = await Promise.all([api("/usage?limit=100"), erstellePrognoseKarte(), erstelleEinheitenKarte(), erstelleTageswerteKarte()]);
     container.replaceChildren();
     if (einheiten) container.append(einheiten);
     if (prognose) container.append(prognose);
+    if (tage) container.append(tage);
 
     if (!laeufe || laeufe.length === 0) {
       container.append(
@@ -218,6 +220,81 @@ async function erstelleEinheitenKarte() {
   return erstelleKarte(t("usage.units.title"), inhalt);
 }
 
+// ─── Day values and the month archive (#700) ───
+
+/**
+ * The last 30 days, summed per day over all agents — from the condensed day values, which stay
+ * when old runs move to the archive. Below: how long runs stay in the working database, and the
+ * archive files. Nothing is ever deleted.
+ */
+async function erstelleTageswerteKarte() {
+  let tage, archiv;
+  try {
+    [tage, archiv] = await Promise.all([api("/usage/days"), api("/usage/archive")]);
+  } catch {
+    return null;
+  }
+
+  const summe = new Map();
+  for (const d of tage ?? []) {
+    const s = summe.get(d.day) ?? { runs: 0, failed: 0, loopLimit: 0, cost: 0, calls: 0, errors: 0, staged: 0 };
+    s.runs += d.runs; s.failed += d.failed; s.loopLimit += d.loopLimit; s.cost += Number(d.costUsd);
+    s.calls += d.toolCalls; s.errors += d.toolErrors; s.staged += d.staged;
+    summe.set(d.day, s);
+  }
+
+  const inhalt = [erstelleElement("p", { klasse: "gedaempft text-klein", text: t("usage.days.hint") })];
+  if (summe.size === 0) {
+    inhalt.push(erstelleElement("p", { klasse: "gedaempft text-klein", text: t("usage.days.none") }));
+  } else {
+    const tabelle = erstelleElement("table", { klasse: "daten-tabelle" });
+    tabelle.append(erstelleElement("thead", {}, erstelleElement("tr", {},
+      ...["usage.days.day", "usage.days.runs", "usage.days.failed", "usage.days.loopLimit", "usage.days.cost", "usage.days.calls", "usage.days.errors", "usage.days.staged"]
+        .map((k) => erstelleElement("th", { klasse: k === "usage.days.day" ? "" : "zahl", text: t(k) })))));
+    const koerper = erstelleElement("tbody");
+    for (const [tag, s] of [...summe.entries()].sort((a, b) => b[0].localeCompare(a[0]))) {
+      koerper.append(erstelleElement("tr", { klasse: s.failed + s.loopLimit > 0 ? "zeile-warnung" : undefined },
+        erstelleElement("td", { text: tag }),
+        erstelleElement("td", { klasse: "zahl", text: String(s.runs) }),
+        erstelleElement("td", { klasse: "zahl", text: String(s.failed) }),
+        erstelleElement("td", { klasse: "zahl", text: String(s.loopLimit) }),
+        erstelleElement("td", { klasse: "zahl", text: `${s.cost.toFixed(2)} $` }),
+        erstelleElement("td", { klasse: "zahl", text: String(s.calls) }),
+        erstelleElement("td", { klasse: "zahl", text: String(s.errors) }),
+        erstelleElement("td", { klasse: "zahl", text: String(s.staged) })));
+    }
+    tabelle.append(koerper);
+    inhalt.push(erstelleElement("div", { klasse: "tabelle-scroll" }, tabelle));
+  }
+
+  // How long runs stay in the working database — set by a human; 0 keeps everything there.
+  const tageFeld = erstelleElement("input", { type: "number", min: "0", max: "36500", step: "1", value: String(archiv?.hotDays ?? 180), "aria-label": t("usage.archive.hotDays") });
+  const sichern = erstelleElement("button", {
+    type: "button",
+    klasse: "schaltflaeche flach klein",
+    text: t("common.save"),
+    onclick: async () => {
+      try {
+        const r = await api("/usage/archive", { method: "PUT", body: { hotDays: Number(tageFeld.value) } });
+        zeigeMeldung(r?.message ?? t("common.saved"), "erfolg", 6000);
+      } catch (err) {
+        zeigeMeldung(err.message, "gefahr", 8000);
+      }
+    }
+  });
+  inhalt.push(
+    erstelleElement("h3", { klasse: "fall-verlauf-titel", text: t("usage.archive.title") }),
+    erstelleElement("p", { klasse: "gedaempft text-klein", text: t("usage.archive.hint") }),
+    erstelleElement("div", { klasse: "mcp-token-formular" },
+      erstelleElement("label", { text: t("usage.archive.hotDays") }), tageFeld, sichern));
+  const dateien = archiv?.files ?? [];
+  inhalt.push(erstelleElement("p", { klasse: "gedaempft text-klein", text: dateien.length === 0
+    ? t("usage.archive.none")
+    : t("usage.archive.files", { list: dateien.map((f) => `${f.month} (${(f.bytes / 1048576).toFixed(1)} MB)`).join(", ") }) }));
+
+  return erstelleKarte(t("usage.days.title"), inhalt);
+}
+
 // ─── Kostenprognose (#595) ───
 
 function getGrundlageText(basis, sample) {

src/ClawdDotNet.Web/Contracts/AuditArchiveDtos.cs

@@ -0,0 +1,13 @@
+namespace ClawdDotNet.Web.Contracts;
+
+/// <summary>#700: One day of one agent, condensed.</summary>
+public sealed record RunDayDto(
+    string Day, string AgentId, string UnitId, int Runs, int Failed, int LoopLimit,
+    long PromptTokens, long CompletionTokens, decimal CostUsd, int ToolCalls, int ToolErrors, int Denied, int Staged);
+
+public sealed record AuditArchiveFileDto(string Month, string FileName, long Bytes);
+
+/// <summary>#700: How long runs stay in the working database, and the month archives.</summary>
+public sealed record AuditArchiveDto(int HotDays, IReadOnlyList<AuditArchiveFileDto> Files);
+
+public sealed record AuditArchiveInputDto(int HotDays);

src/ClawdDotNet.Web/Endpoints/AnalyticsEndpoints.cs

@@ -111,6 +111,34 @@ public static class AnalyticsEndpoints
             return Results.Ok(new UsageFacetsDto(f.Agents, f.Models, f.Sources, f.Statuses));
         });
 
+        // #700: day values per agent and unit — they stay when old runs move to the archive.
+        api.MapGet("/usage/days", async (AppHost host, CancellationToken ct, string? from = null, string? to = null, string? agent = null, string? unit = null) =>
+        {
+            if (host.AuditArchive is not { } archive)
+                return ApiEndpoints.Unavailable("No day values in this instance.");
+            var today = DateOnly.FromDateTime(DateTime.UtcNow);
+            var end = DateOnly.TryParse(to, System.Globalization.CultureInfo.InvariantCulture, out var t) ? t : today;
+            var start = DateOnly.TryParse(from, System.Globalization.CultureInfo.InvariantCulture, out var f) ? f : end.AddDays(-29);
+            var days = await archive.DaysAsync(start, end, agent, unit, ct);
+            return Results.Ok(days.Select(d => new RunDayDto(d.Day, d.AgentId, d.UnitId, d.Runs, d.Failed, d.LoopLimit,
+                d.PromptTokens, d.CompletionTokens, d.CostUsd, d.ToolCalls, d.ToolErrors, d.Denied, d.Staged)).ToList());
+        });
+
+        api.MapGet("/usage/archive", (AppHost host) => Results.Ok(new AuditArchiveDto(
+            host.Instance.AuditArchive.HotDays,
+            (host.AuditArchive?.Files() ?? []).Select(f => new AuditArchiveFileDto(f.Month, f.FileName, f.Bytes)).ToList())));
+
+        api.MapPut("/usage/archive", (AppHost host, AuditArchiveInputDto input) =>
+        {
+            if (input.HotDays is < 0 or > 36500)
+                return Results.BadRequest(new OutcomeDto(false, "Days between 0 (keep everything in the working database) and 36500."));
+            host.Instance.AuditArchive.HotDays = input.HotDays;
+            host.SaveInstance(new InstanceChange(InstanceChangeKind.Settings));
+            return Results.Ok(new OutcomeDto(true, input.HotDays == 0
+                ? "Runs stay in the working database."
+                : $"Runs older than {input.HotDays} days move to the month archive. Nothing is deleted."));
+        });
+
         api.MapGet("/runs/{runId}", async (AppHost host, string runId, CancellationToken ct) =>
         {
             if (host.Insights is not { } insights)

tests/ClawdDotNet.Core.Tests/Audit/AuditArchiveTests.cs

@@ -0,0 +1,124 @@
+using ClawdDotNet.Core.Audit;
+using ClawdDotNet.Core.Storage;
+using ClawdDotNet.Core.Tests.Infrastructure;
+using Microsoft.Extensions.Logging.Abstractions;
+using Shouldly;
+
+namespace ClawdDotNet.Core.Tests.Audit;
+
+/// <summary>
+/// #700: Audit and receipts are evidence — nothing is deleted. Old runs move from the working
+/// database into one archive file per month and are still found; each day is condensed per
+/// agent and unit first, and those values stay.
+/// </summary>
+public sealed class AuditArchiveTests : IDisposable
+{
+    private readonly string _directory = Path.Combine(Path.GetTempPath(), "clawd-tests", "arc-" + Guid.NewGuid().ToString("N")[..8]);
+    private readonly SqliteStorage _storage;
+    private readonly SqliteAuditRepository _audit;
+    private readonly FakeTimeProvider _clock = new(new DateTimeOffset(2026, 10, 2, 9, 0, 0, TimeSpan.Zero));
+    private readonly AuditArchiveSettings _settings = new() { HotDays = 30 };
+    private readonly AuditArchive _archive;
+
+    public AuditArchiveTests()
+    {
+        _storage = new SqliteStorage(Path.Combine(_directory, "state.db"));
+        _audit = new SqliteAuditRepository(_storage);
+        _archive = new AuditArchive(_storage, () => _settings, agent => agent == "desk" ? "sales" : null, NullLogger.Instance, _clock);
+    }
+
+    public void Dispose()
+    {
+        SqliteStorage.ReleasePooledConnections(_directory);
+        try { Directory.Delete(_directory, recursive: true); }
+        catch { /* cleanup is secondary */ }
+    }
+
+    private async Task Run(string runId, string agent, DateTime at, string status = "Completed", decimal cost = 0.02m, params string[] callStatus)
+    {
+        foreach (var s in callStatus)
+            await _audit.AppendAsync(new AuditEntry
+            {
+                RunId = runId, AgentId = agent, Tool = "FileRW", Arguments = "{\"action\":\"read\"}",
+                Status = Enum.Parse<AuditStatus>(s), OccurredAt = at
+            }, default);
+        await _audit.RecordReceiptAsync(new RunReceipt
+        {
+            RunId = runId, AgentId = agent, Status = status, CostUsd = cost, CostIsKnown = true,
+            PromptTokens = 1000, CompletionTokens = 100, OccurredAt = at
+        }, default);
+    }
+
+    [Fact]
+    public async Task Each_past_day_is_condensed_per_agent_with_its_unit_and_today_waits()
+    {
+        var yesterday = new DateTime(2026, 10, 1, 12, 0, 0, DateTimeKind.Utc);
+        await Run("r1", "desk", yesterday, callStatus: ["Ok", "Error", "Staged"]);
+        await Run("r2", "desk", yesterday.AddHours(1), "LoopLimitExceeded", 0.05m, "Ok");
+        await Run("r3", "desk", yesterday.AddHours(2), "Failed");
+        await Run("r4", "desk", yesterday.AddHours(3), "BudgetExceeded", 0m);
+        await Run("r5", "other", yesterday.AddDays(-1), callStatus: ["Denied"]);
+        await Run("r6", "desk", new DateTime(2026, 10, 2, 8, 0, 0, DateTimeKind.Utc));
+
+        await _archive.CondenseAsync(default);
+
+        var days = await _archive.DaysAsync(new DateOnly(2026, 9, 1), new DateOnly(2026, 10, 2), null, null, default);
+        days.Select(d => (d.Day, d.AgentId)).ShouldBe([("2026-09-30", "other"), ("2026-10-01", "desk")]);
+        var desk = days.Single(d => d.AgentId == "desk");
+        (desk.UnitId, desk.Runs, desk.Failed, desk.LoopLimit).ShouldBe(("sales", 3, 1, 1), "a budget refusal is no run");
+        desk.CostUsd.ShouldBe(0.09m);
+        (desk.ToolCalls, desk.ToolErrors, desk.Staged).ShouldBe((3, 1, 1));
+        days.Single(d => d.AgentId == "other").Denied.ShouldBe(1);
+        (await _archive.DaysAsync(new DateOnly(2026, 9, 1), new DateOnly(2026, 10, 2), null, "sales", default)).Count.ShouldBe(1);
+    }
+
+    [Fact]
+    public async Task Old_runs_move_to_their_month_archive_are_still_found_and_nothing_is_lost()
+    {
+        await Run("aug", "desk", new DateTime(2026, 8, 20, 10, 0, 0, DateTimeKind.Utc), callStatus: ["Started", "Ok"]);
+        await Run("jul", "desk", new DateTime(2026, 7, 31, 10, 0, 0, DateTimeKind.Utc), callStatus: ["Ok"]);
+        await Run("now", "desk", new DateTime(2026, 9, 28, 10, 0, 0, DateTimeKind.Utc), callStatus: ["Ok"]);
+
+        var moved = await _archive.ArchiveAsync(default);
+
+        moved.ShouldBe(5, "three audit rows and two receipts");
+        _archive.Files().Select(f => f.Month).ShouldBe(["2026-08", "2026-07"]);
+        (await _audit.CountAsync(default)).ShouldBe(1, "only the recent run stays in the working table");
+        (await _audit.ListForRunAsync("aug", default)).Count.ShouldBe(2);
+        (await _audit.GetReceiptForRunAsync("jul", default))!.AgentId.ShouldBe("desk");
+        (await _audit.GetReceiptForRunAsync("now", default)).ShouldNotBeNull();
+        (await _archive.DaysAsync(new DateOnly(2026, 7, 1), new DateOnly(2026, 8, 31), null, null, default))
+            .Select(d => d.Day).ShouldBe(["2026-07-31", "2026-08-20"], "the day values stay after the move");
+
+        (await _archive.ArchiveAsync(default)).ShouldBe(0, "a second pass moves nothing twice");
+    }
+
+    [Fact]
+    public async Task A_column_added_later_is_added_to_an_existing_archive()
+    {
+        await Run("a1", "desk", new DateTime(2026, 8, 1, 10, 0, 0, DateTimeKind.Utc));
+        await _archive.ArchiveAsync(default);
+
+        await _storage.WriteAsync(async conn =>
+        {
+            using var cmd = conn.CreateCommand();
+            cmd.CommandText = "ALTER TABLE RunReceipts ADD COLUMN LaterField TEXT NULL";
+            await cmd.ExecuteNonQueryAsync();
+        }, default);
+        await Run("a2", "desk", new DateTime(2026, 8, 2, 10, 0, 0, DateTimeKind.Utc));
+
+        (await _archive.ArchiveAsync(default)).ShouldBe(1);
+        (await _audit.GetReceiptForRunAsync("a2", default)).ShouldNotBeNull();
+    }
+
+    [Fact]
+    public async Task Zero_days_keeps_everything_in_the_working_database()
+    {
+        _settings.HotDays = 0;
+        await Run("old", "desk", new DateTime(2025, 1, 1, 10, 0, 0, DateTimeKind.Utc), callStatus: ["Ok"]);
+
+        (await _archive.ArchiveAsync(default)).ShouldBe(0);
+        _archive.Files().ShouldBeEmpty();
+        (await _audit.CountAsync(default)).ShouldBe(1);
+    }
+}