Mathias Beaulieu-Duncan 5c497f8923 this is a mess

2025-12-11 01:18:24 -05:00

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Phase 2.6: Stream Configuration

Status: ✅ Complete Started: 2025-12-10 Completed: 2025-12-10 Target: Per-stream configuration for retention, DLQ, and lifecycle management

Overview

Phase 2.6 adds comprehensive per-stream configuration capabilities to the event streaming system. Instead of only having global settings, each stream can now have its own:

Retention policies (time-based and size-based)
Dead Letter Queue (DLQ) configuration (error handling, retry limits)
Lifecycle settings (auto-creation, archival, deletion)
Performance tuning (batch sizes, compression, indexing)
Access control (read/write permissions, consumer group limits)

This enables fine-grained control over stream behavior and allows different streams to have different operational characteristics based on their business requirements.

Goals

✅ Per-Stream Retention: Override global retention policies per stream
✅ DLQ Configuration: Configure error handling and dead-letter streams
✅ Lifecycle Management: Auto-creation, archival, and cleanup policies
✅ Performance Tuning: Per-stream performance and storage settings
✅ Access Control: Stream-level permissions and quotas
✅ Configuration API: CRUD operations for stream configurations
⏸️ Configuration UI: Web-based configuration management (deferred)

Architecture

Core Abstractions

StreamConfiguration Model

Represents all configuration for a single stream:

public class StreamConfiguration
{
    // Identity
    public required string StreamName { get; set; }
    public string? Description { get; set; }
    public Dictionary<string, string>? Tags { get; set; }

    // Retention Configuration
    public RetentionConfiguration? Retention { get; set; }

    // Dead Letter Queue Configuration
    public DeadLetterQueueConfiguration? DeadLetterQueue { get; set; }

    // Lifecycle Configuration
    public LifecycleConfiguration? Lifecycle { get; set; }

    // Performance Configuration
    public PerformanceConfiguration? Performance { get; set; }

    // Access Control
    public AccessControlConfiguration? AccessControl { get; set; }

    // Metadata
    public DateTimeOffset CreatedAt { get; set; }
    public DateTimeOffset? UpdatedAt { get; set; }
    public string? CreatedBy { get; set; }
    public string? UpdatedBy { get; set; }
}

public class RetentionConfiguration
{
    public TimeSpan? MaxAge { get; set; }
    public long? MaxSizeBytes { get; set; }
    public long? MaxEventCount { get; set; }
    public bool? EnablePartitioning { get; set; }
    public TimeSpan? PartitionInterval { get; set; }
}

public class DeadLetterQueueConfiguration
{
    public bool Enabled { get; set; }
    public string? DeadLetterStreamName { get; set; }
    public int MaxDeliveryAttempts { get; set; } = 3;
    public TimeSpan? RetryDelay { get; set; }
    public bool? StoreOriginalEvent { get; set; }
    public bool? StoreErrorDetails { get; set; }
}

public class LifecycleConfiguration
{
    public bool AutoCreate { get; set; } = true;
    public bool AutoArchive { get; set; }
    public TimeSpan? ArchiveAfter { get; set; }
    public string? ArchiveLocation { get; set; }
    public bool AutoDelete { get; set; }
    public TimeSpan? DeleteAfter { get; set; }
}

public class PerformanceConfiguration
{
    public int? BatchSize { get; set; }
    public bool? EnableCompression { get; set; }
    public string? CompressionAlgorithm { get; set; }
    public bool? EnableIndexing { get; set; }
    public List<string>? IndexedFields { get; set; }
    public int? CacheSize { get; set; }
}

public class AccessControlConfiguration
{
    public bool PublicRead { get; set; }
    public bool PublicWrite { get; set; }
    public List<string>? AllowedReaders { get; set; }
    public List<string>? AllowedWriters { get; set; }
    public int? MaxConsumerGroups { get; set; }
    public long? MaxEventsPerSecond { get; set; }
}

IStreamConfigurationStore Interface

namespace Svrnty.CQRS.Events.Abstractions;

/// <summary>
/// Store for managing stream-specific configuration.
/// </summary>
public interface IStreamConfigurationStore
{
    /// <summary>
    /// Gets configuration for a specific stream.
    /// </summary>
    Task<StreamConfiguration?> GetConfigurationAsync(
        string streamName,
        CancellationToken cancellationToken = default);

    /// <summary>
    /// Gets all stream configurations.
    /// </summary>
    Task<IReadOnlyList<StreamConfiguration>> GetAllConfigurationsAsync(
        CancellationToken cancellationToken = default);

    /// <summary>
    /// Sets or updates configuration for a stream.
    /// </summary>
    Task SetConfigurationAsync(
        StreamConfiguration configuration,
        CancellationToken cancellationToken = default);

    /// <summary>
    /// Deletes configuration for a stream (reverts to defaults).
    /// </summary>
    Task DeleteConfigurationAsync(
        string streamName,
        CancellationToken cancellationToken = default);

    /// <summary>
    /// Gets configurations matching a filter.
    /// </summary>
    Task<IReadOnlyList<StreamConfiguration>> FindConfigurationsAsync(
        Func<StreamConfiguration, bool> predicate,
        CancellationToken cancellationToken = default);
}

IStreamConfigurationProvider Interface

Provides effective configuration by merging stream-specific and global settings:

namespace Svrnty.CQRS.Events.Abstractions;

/// <summary>
/// Provides effective stream configuration by merging stream-specific and global settings.
/// </summary>
public interface IStreamConfigurationProvider
{
    /// <summary>
    /// Gets the effective configuration for a stream (stream-specific merged with global defaults).
    /// </summary>
    Task<StreamConfiguration> GetEffectiveConfigurationAsync(
        string streamName,
        CancellationToken cancellationToken = default);

    /// <summary>
    /// Gets the retention policy for a stream.
    /// </summary>
    Task<RetentionConfiguration?> GetRetentionConfigurationAsync(
        string streamName,
        CancellationToken cancellationToken = default);

    /// <summary>
    /// Gets the DLQ configuration for a stream.
    /// </summary>
    Task<DeadLetterQueueConfiguration?> GetDeadLetterQueueConfigurationAsync(
        string streamName,
        CancellationToken cancellationToken = default);

    /// <summary>
    /// Gets the lifecycle configuration for a stream.
    /// </summary>
    Task<LifecycleConfiguration?> GetLifecycleConfigurationAsync(
        string streamName,
        CancellationToken cancellationToken = default);
}

PostgreSQL Implementation

Database Schema

-- Stream configuration table
CREATE TABLE IF NOT EXISTS event_streaming.stream_configurations (
    stream_name VARCHAR(255) PRIMARY KEY,
    description TEXT,
    tags JSONB,

    -- Retention configuration
    retention_max_age_seconds BIGINT,
    retention_max_size_bytes BIGINT,
    retention_max_event_count BIGINT,
    retention_enable_partitioning BOOLEAN,
    retention_partition_interval_seconds BIGINT,

    -- Dead Letter Queue configuration
    dlq_enabled BOOLEAN DEFAULT FALSE,
    dlq_stream_name VARCHAR(255),
    dlq_max_delivery_attempts INTEGER DEFAULT 3,
    dlq_retry_delay_seconds BIGINT,
    dlq_store_original_event BOOLEAN DEFAULT TRUE,
    dlq_store_error_details BOOLEAN DEFAULT TRUE,

    -- Lifecycle configuration
    lifecycle_auto_create BOOLEAN DEFAULT TRUE,
    lifecycle_auto_archive BOOLEAN DEFAULT FALSE,
    lifecycle_archive_after_seconds BIGINT,
    lifecycle_archive_location TEXT,
    lifecycle_auto_delete BOOLEAN DEFAULT FALSE,
    lifecycle_delete_after_seconds BIGINT,

    -- Performance configuration
    performance_batch_size INTEGER,
    performance_enable_compression BOOLEAN,
    performance_compression_algorithm VARCHAR(50),
    performance_enable_indexing BOOLEAN,
    performance_indexed_fields JSONB,
    performance_cache_size INTEGER,

    -- Access control
    access_public_read BOOLEAN DEFAULT FALSE,
    access_public_write BOOLEAN DEFAULT FALSE,
    access_allowed_readers JSONB,
    access_allowed_writers JSONB,
    access_max_consumer_groups INTEGER,
    access_max_events_per_second BIGINT,

    -- Metadata
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ,
    created_by VARCHAR(255),
    updated_by VARCHAR(255)
);

-- Index for efficient tag queries
CREATE INDEX IF NOT EXISTS idx_stream_config_tags
ON event_streaming.stream_configurations USING GIN (tags);

-- Index for lifecycle queries
CREATE INDEX IF NOT EXISTS idx_stream_config_lifecycle
ON event_streaming.stream_configurations (lifecycle_auto_archive, lifecycle_auto_delete);

PostgresStreamConfigurationStore Implementation

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Npgsql;
using Svrnty.CQRS.Events.Abstractions;

namespace Svrnty.CQRS.Events.PostgreSQL;

public class PostgresStreamConfigurationStore : IStreamConfigurationStore
{
    private readonly PostgresEventStreamStoreOptions _options;
    private readonly ILogger<PostgresStreamConfigurationStore> _logger;

    public PostgresStreamConfigurationStore(
        IOptions<PostgresEventStreamStoreOptions> options,
        ILogger<PostgresStreamConfigurationStore> logger)
    {
        _options = options?.Value ?? throw new ArgumentNullException(nameof(options));
        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
    }

    public async Task<StreamConfiguration?> GetConfigurationAsync(
        string streamName,
        CancellationToken cancellationToken = default)
    {
        const string sql = @"
            SELECT * FROM event_streaming.stream_configurations
            WHERE stream_name = @StreamName";

        await using var connection = new NpgsqlConnection(_options.ConnectionString);
        await connection.OpenAsync(cancellationToken);

        await using var command = new NpgsqlCommand(sql, connection);
        command.Parameters.AddWithValue("@StreamName", streamName);

        await using var reader = await command.ExecuteReaderAsync(cancellationToken);

        if (await reader.ReadAsync(cancellationToken))
        {
            return MapToStreamConfiguration(reader);
        }

        return null;
    }

    public async Task<IReadOnlyList<StreamConfiguration>> GetAllConfigurationsAsync(
        CancellationToken cancellationToken = default)
    {
        const string sql = "SELECT * FROM event_streaming.stream_configurations ORDER BY stream_name";

        await using var connection = new NpgsqlConnection(_options.ConnectionString);
        await connection.OpenAsync(cancellationToken);

        await using var command = new NpgsqlCommand(sql, connection);
        await using var reader = await command.ExecuteReaderAsync(cancellationToken);

        var configurations = new List<StreamConfiguration>();
        while (await reader.ReadAsync(cancellationToken))
        {
            configurations.Add(MapToStreamConfiguration(reader));
        }

        return configurations;
    }

    public async Task SetConfigurationAsync(
        StreamConfiguration configuration,
        CancellationToken cancellationToken = default)
    {
        const string sql = @"
            INSERT INTO event_streaming.stream_configurations (
                stream_name, description, tags,
                retention_max_age_seconds, retention_max_size_bytes, retention_max_event_count,
                retention_enable_partitioning, retention_partition_interval_seconds,
                dlq_enabled, dlq_stream_name, dlq_max_delivery_attempts,
                dlq_retry_delay_seconds, dlq_store_original_event, dlq_store_error_details,
                lifecycle_auto_create, lifecycle_auto_archive, lifecycle_archive_after_seconds,
                lifecycle_archive_location, lifecycle_auto_delete, lifecycle_delete_after_seconds,
                performance_batch_size, performance_enable_compression, performance_compression_algorithm,
                performance_enable_indexing, performance_indexed_fields, performance_cache_size,
                access_public_read, access_public_write, access_allowed_readers, access_allowed_writers,
                access_max_consumer_groups, access_max_events_per_second,
                created_at, updated_at, created_by, updated_by
            )
            VALUES (
                @StreamName, @Description, @Tags::jsonb,
                @RetentionMaxAge, @RetentionMaxSize, @RetentionMaxCount,
                @RetentionPartitioning, @RetentionPartitionInterval,
                @DlqEnabled, @DlqStreamName, @DlqMaxAttempts,
                @DlqRetryDelay, @DlqStoreOriginal, @DlqStoreError,
                @LifecycleAutoCreate, @LifecycleAutoArchive, @LifecycleArchiveAfter,
                @LifecycleArchiveLocation, @LifecycleAutoDelete, @LifecycleDeleteAfter,
                @PerfBatchSize, @PerfCompression, @PerfCompressionAlgorithm,
                @PerfIndexing, @PerfIndexedFields::jsonb, @PerfCacheSize,
                @AccessPublicRead, @AccessPublicWrite, @AccessReaders::jsonb, @AccessWriters::jsonb,
                @AccessMaxConsumerGroups, @AccessMaxEventsPerSecond,
                @CreatedAt, @UpdatedAt, @CreatedBy, @UpdatedBy
            )
            ON CONFLICT (stream_name) DO UPDATE SET
                description = EXCLUDED.description,
                tags = EXCLUDED.tags,
                retention_max_age_seconds = EXCLUDED.retention_max_age_seconds,
                retention_max_size_bytes = EXCLUDED.retention_max_size_bytes,
                retention_max_event_count = EXCLUDED.retention_max_event_count,
                retention_enable_partitioning = EXCLUDED.retention_enable_partitioning,
                retention_partition_interval_seconds = EXCLUDED.retention_partition_interval_seconds,
                dlq_enabled = EXCLUDED.dlq_enabled,
                dlq_stream_name = EXCLUDED.dlq_stream_name,
                dlq_max_delivery_attempts = EXCLUDED.dlq_max_delivery_attempts,
                dlq_retry_delay_seconds = EXCLUDED.dlq_retry_delay_seconds,
                dlq_store_original_event = EXCLUDED.dlq_store_original_event,
                dlq_store_error_details = EXCLUDED.dlq_store_error_details,
                lifecycle_auto_create = EXCLUDED.lifecycle_auto_create,
                lifecycle_auto_archive = EXCLUDED.lifecycle_auto_archive,
                lifecycle_archive_after_seconds = EXCLUDED.lifecycle_archive_after_seconds,
                lifecycle_archive_location = EXCLUDED.lifecycle_archive_location,
                lifecycle_auto_delete = EXCLUDED.lifecycle_auto_delete,
                lifecycle_delete_after_seconds = EXCLUDED.lifecycle_delete_after_seconds,
                performance_batch_size = EXCLUDED.performance_batch_size,
                performance_enable_compression = EXCLUDED.performance_enable_compression,
                performance_compression_algorithm = EXCLUDED.performance_compression_algorithm,
                performance_enable_indexing = EXCLUDED.performance_enable_indexing,
                performance_indexed_fields = EXCLUDED.performance_indexed_fields,
                performance_cache_size = EXCLUDED.performance_cache_size,
                access_public_read = EXCLUDED.access_public_read,
                access_public_write = EXCLUDED.access_public_write,
                access_allowed_readers = EXCLUDED.access_allowed_readers,
                access_allowed_writers = EXCLUDED.access_allowed_writers,
                access_max_consumer_groups = EXCLUDED.access_max_consumer_groups,
                access_max_events_per_second = EXCLUDED.access_max_events_per_second,
                updated_at = EXCLUDED.updated_at,
                updated_by = EXCLUDED.updated_by";

        await using var connection = new NpgsqlConnection(_options.ConnectionString);
        await connection.OpenAsync(cancellationToken);

        await using var command = new NpgsqlCommand(sql, connection);

        // Basic fields
        command.Parameters.AddWithValue("@StreamName", configuration.StreamName);
        command.Parameters.AddWithValue("@Description", (object?)configuration.Description ?? DBNull.Value);
        command.Parameters.AddWithValue("@Tags", configuration.Tags != null
            ? JsonSerializer.Serialize(configuration.Tags)
            : DBNull.Value);

        // Retention
        var retention = configuration.Retention;
        command.Parameters.AddWithValue("@RetentionMaxAge", retention?.MaxAge?.TotalSeconds ?? (object)DBNull.Value);
        command.Parameters.AddWithValue("@RetentionMaxSize", retention?.MaxSizeBytes ?? (object)DBNull.Value);
        command.Parameters.AddWithValue("@RetentionMaxCount", retention?.MaxEventCount ?? (object)DBNull.Value);
        command.Parameters.AddWithValue("@RetentionPartitioning", retention?.EnablePartitioning ?? (object)DBNull.Value);
        command.Parameters.AddWithValue("@RetentionPartitionInterval", retention?.PartitionInterval?.TotalSeconds ?? (object)DBNull.Value);

        // DLQ
        var dlq = configuration.DeadLetterQueue;
        command.Parameters.AddWithValue("@DlqEnabled", dlq?.Enabled ?? false);
        command.Parameters.AddWithValue("@DlqStreamName", (object?)dlq?.DeadLetterStreamName ?? DBNull.Value);
        command.Parameters.AddWithValue("@DlqMaxAttempts", dlq?.MaxDeliveryAttempts ?? 3);
        command.Parameters.AddWithValue("@DlqRetryDelay", dlq?.RetryDelay?.TotalSeconds ?? (object)DBNull.Value);
        command.Parameters.AddWithValue("@DlqStoreOriginal", dlq?.StoreOriginalEvent ?? (object)DBNull.Value);
        command.Parameters.AddWithValue("@DlqStoreError", dlq?.StoreErrorDetails ?? (object)DBNull.Value);

        // Lifecycle
        var lifecycle = configuration.Lifecycle;
        command.Parameters.AddWithValue("@LifecycleAutoCreate", lifecycle?.AutoCreate ?? true);
        command.Parameters.AddWithValue("@LifecycleAutoArchive", lifecycle?.AutoArchive ?? false);
        command.Parameters.AddWithValue("@LifecycleArchiveAfter", lifecycle?.ArchiveAfter?.TotalSeconds ?? (object)DBNull.Value);
        command.Parameters.AddWithValue("@LifecycleArchiveLocation", (object?)lifecycle?.ArchiveLocation ?? DBNull.Value);
        command.Parameters.AddWithValue("@LifecycleAutoDelete", lifecycle?.AutoDelete ?? false);
        command.Parameters.AddWithValue("@LifecycleDeleteAfter", lifecycle?.DeleteAfter?.TotalSeconds ?? (object)DBNull.Value);

        // Performance
        var perf = configuration.Performance;
        command.Parameters.AddWithValue("@PerfBatchSize", perf?.BatchSize ?? (object)DBNull.Value);
        command.Parameters.AddWithValue("@PerfCompression", perf?.EnableCompression ?? (object)DBNull.Value);
        command.Parameters.AddWithValue("@PerfCompressionAlgorithm", (object?)perf?.CompressionAlgorithm ?? DBNull.Value);
        command.Parameters.AddWithValue("@PerfIndexing", perf?.EnableIndexing ?? (object)DBNull.Value);
        command.Parameters.AddWithValue("@PerfIndexedFields", perf?.IndexedFields != null
            ? JsonSerializer.Serialize(perf.IndexedFields)
            : DBNull.Value);
        command.Parameters.AddWithValue("@PerfCacheSize", perf?.CacheSize ?? (object)DBNull.Value);

        // Access Control
        var access = configuration.AccessControl;
        command.Parameters.AddWithValue("@AccessPublicRead", access?.PublicRead ?? false);
        command.Parameters.AddWithValue("@AccessPublicWrite", access?.PublicWrite ?? false);
        command.Parameters.AddWithValue("@AccessReaders", access?.AllowedReaders != null
            ? JsonSerializer.Serialize(access.AllowedReaders)
            : DBNull.Value);
        command.Parameters.AddWithValue("@AccessWriters", access?.AllowedWriters != null
            ? JsonSerializer.Serialize(access.AllowedWriters)
            : DBNull.Value);
        command.Parameters.AddWithValue("@AccessMaxConsumerGroups", access?.MaxConsumerGroups ?? (object)DBNull.Value);
        command.Parameters.AddWithValue("@AccessMaxEventsPerSecond", access?.MaxEventsPerSecond ?? (object)DBNull.Value);

        // Metadata
        command.Parameters.AddWithValue("@CreatedAt", configuration.CreatedAt);
        command.Parameters.AddWithValue("@UpdatedAt", configuration.UpdatedAt ?? (object)DBNull.Value);
        command.Parameters.AddWithValue("@CreatedBy", (object?)configuration.CreatedBy ?? DBNull.Value);
        command.Parameters.AddWithValue("@UpdatedBy", (object?)configuration.UpdatedBy ?? DBNull.Value);

        await command.ExecuteNonQueryAsync(cancellationToken);

        _logger.LogInformation("Set configuration for stream {StreamName}", configuration.StreamName);
    }

    public async Task DeleteConfigurationAsync(
        string streamName,
        CancellationToken cancellationToken = default)
    {
        const string sql = @"
            DELETE FROM event_streaming.stream_configurations
            WHERE stream_name = @StreamName";

        await using var connection = new NpgsqlConnection(_options.ConnectionString);
        await connection.OpenAsync(cancellationToken);

        await using var command = new NpgsqlCommand(sql, connection);
        command.Parameters.AddWithValue("@StreamName", streamName);

        await command.ExecuteNonQueryAsync(cancellationToken);

        _logger.LogInformation("Deleted configuration for stream {StreamName}", streamName);
    }

    public async Task<IReadOnlyList<StreamConfiguration>> FindConfigurationsAsync(
        Func<StreamConfiguration, bool> predicate,
        CancellationToken cancellationToken = default)
    {
        var allConfigurations = await GetAllConfigurationsAsync(cancellationToken);
        return allConfigurations.Where(predicate).ToList();
    }

    private static StreamConfiguration MapToStreamConfiguration(NpgsqlDataReader reader)
    {
        var config = new StreamConfiguration
        {
            StreamName = reader.GetString(reader.GetOrdinal("stream_name")),
            Description = reader.IsDBNull(reader.GetOrdinal("description"))
                ? null
                : reader.GetString(reader.GetOrdinal("description")),
            Tags = reader.IsDBNull(reader.GetOrdinal("tags"))
                ? null
                : JsonSerializer.Deserialize<Dictionary<string, string>>(
                    reader.GetString(reader.GetOrdinal("tags"))),
            CreatedAt = reader.GetFieldValue<DateTimeOffset>(reader.GetOrdinal("created_at")),
            UpdatedAt = reader.IsDBNull(reader.GetOrdinal("updated_at"))
                ? null
                : reader.GetFieldValue<DateTimeOffset>(reader.GetOrdinal("updated_at")),
            CreatedBy = reader.IsDBNull(reader.GetOrdinal("created_by"))
                ? null
                : reader.GetString(reader.GetOrdinal("created_by")),
            UpdatedBy = reader.IsDBNull(reader.GetOrdinal("updated_by"))
                ? null
                : reader.GetString(reader.GetOrdinal("updated_by"))
        };

        // Map retention configuration
        if (!reader.IsDBNull(reader.GetOrdinal("retention_max_age_seconds")) ||
            !reader.IsDBNull(reader.GetOrdinal("retention_max_size_bytes")) ||
            !reader.IsDBNull(reader.GetOrdinal("retention_max_event_count")))
        {
            config.Retention = new RetentionConfiguration
            {
                MaxAge = reader.IsDBNull(reader.GetOrdinal("retention_max_age_seconds"))
                    ? null
                    : TimeSpan.FromSeconds(reader.GetInt64(reader.GetOrdinal("retention_max_age_seconds"))),
                MaxSizeBytes = reader.IsDBNull(reader.GetOrdinal("retention_max_size_bytes"))
                    ? null
                    : reader.GetInt64(reader.GetOrdinal("retention_max_size_bytes")),
                MaxEventCount = reader.IsDBNull(reader.GetOrdinal("retention_max_event_count"))
                    ? null
                    : reader.GetInt64(reader.GetOrdinal("retention_max_event_count")),
                EnablePartitioning = reader.IsDBNull(reader.GetOrdinal("retention_enable_partitioning"))
                    ? null
                    : reader.GetBoolean(reader.GetOrdinal("retention_enable_partitioning")),
                PartitionInterval = reader.IsDBNull(reader.GetOrdinal("retention_partition_interval_seconds"))
                    ? null
                    : TimeSpan.FromSeconds(reader.GetInt64(reader.GetOrdinal("retention_partition_interval_seconds")))
            };
        }

        // Map DLQ configuration
        var dlqEnabled = reader.GetBoolean(reader.GetOrdinal("dlq_enabled"));
        if (dlqEnabled)
        {
            config.DeadLetterQueue = new DeadLetterQueueConfiguration
            {
                Enabled = true,
                DeadLetterStreamName = reader.IsDBNull(reader.GetOrdinal("dlq_stream_name"))
                    ? null
                    : reader.GetString(reader.GetOrdinal("dlq_stream_name")),
                MaxDeliveryAttempts = reader.GetInt32(reader.GetOrdinal("dlq_max_delivery_attempts")),
                RetryDelay = reader.IsDBNull(reader.GetOrdinal("dlq_retry_delay_seconds"))
                    ? null
                    : TimeSpan.FromSeconds(reader.GetInt64(reader.GetOrdinal("dlq_retry_delay_seconds"))),
                StoreOriginalEvent = reader.IsDBNull(reader.GetOrdinal("dlq_store_original_event"))
                    ? null
                    : reader.GetBoolean(reader.GetOrdinal("dlq_store_original_event")),
                StoreErrorDetails = reader.IsDBNull(reader.GetOrdinal("dlq_store_error_details"))
                    ? null
                    : reader.GetBoolean(reader.GetOrdinal("dlq_store_error_details"))
            };
        }

        // Map lifecycle configuration
        config.Lifecycle = new LifecycleConfiguration
        {
            AutoCreate = reader.GetBoolean(reader.GetOrdinal("lifecycle_auto_create")),
            AutoArchive = reader.GetBoolean(reader.GetOrdinal("lifecycle_auto_archive")),
            ArchiveAfter = reader.IsDBNull(reader.GetOrdinal("lifecycle_archive_after_seconds"))
                ? null
                : TimeSpan.FromSeconds(reader.GetInt64(reader.GetOrdinal("lifecycle_archive_after_seconds"))),
            ArchiveLocation = reader.IsDBNull(reader.GetOrdinal("lifecycle_archive_location"))
                ? null
                : reader.GetString(reader.GetOrdinal("lifecycle_archive_location")),
            AutoDelete = reader.GetBoolean(reader.GetOrdinal("lifecycle_auto_delete")),
            DeleteAfter = reader.IsDBNull(reader.GetOrdinal("lifecycle_delete_after_seconds"))
                ? null
                : TimeSpan.FromSeconds(reader.GetInt64(reader.GetOrdinal("lifecycle_delete_after_seconds")))
        };

        // Map performance configuration
        if (!reader.IsDBNull(reader.GetOrdinal("performance_batch_size")) ||
            !reader.IsDBNull(reader.GetOrdinal("performance_enable_compression")))
        {
            config.Performance = new PerformanceConfiguration
            {
                BatchSize = reader.IsDBNull(reader.GetOrdinal("performance_batch_size"))
                    ? null
                    : reader.GetInt32(reader.GetOrdinal("performance_batch_size")),
                EnableCompression = reader.IsDBNull(reader.GetOrdinal("performance_enable_compression"))
                    ? null
                    : reader.GetBoolean(reader.GetOrdinal("performance_enable_compression")),
                CompressionAlgorithm = reader.IsDBNull(reader.GetOrdinal("performance_compression_algorithm"))
                    ? null
                    : reader.GetString(reader.GetOrdinal("performance_compression_algorithm")),
                EnableIndexing = reader.IsDBNull(reader.GetOrdinal("performance_enable_indexing"))
                    ? null
                    : reader.GetBoolean(reader.GetOrdinal("performance_enable_indexing")),
                IndexedFields = reader.IsDBNull(reader.GetOrdinal("performance_indexed_fields"))
                    ? null
                    : JsonSerializer.Deserialize<List<string>>(
                        reader.GetString(reader.GetOrdinal("performance_indexed_fields"))),
                CacheSize = reader.IsDBNull(reader.GetOrdinal("performance_cache_size"))
                    ? null
                    : reader.GetInt32(reader.GetOrdinal("performance_cache_size"))
            };
        }

        // Map access control configuration
        config.AccessControl = new AccessControlConfiguration
        {
            PublicRead = reader.GetBoolean(reader.GetOrdinal("access_public_read")),
            PublicWrite = reader.GetBoolean(reader.GetOrdinal("access_public_write")),
            AllowedReaders = reader.IsDBNull(reader.GetOrdinal("access_allowed_readers"))
                ? null
                : JsonSerializer.Deserialize<List<string>>(
                    reader.GetString(reader.GetOrdinal("access_allowed_readers"))),
            AllowedWriters = reader.IsDBNull(reader.GetOrdinal("access_allowed_writers"))
                ? null
                : JsonSerializer.Deserialize<List<string>>(
                    reader.GetString(reader.GetOrdinal("access_allowed_writers"))),
            MaxConsumerGroups = reader.IsDBNull(reader.GetOrdinal("access_max_consumer_groups"))
                ? null
                : reader.GetInt32(reader.GetOrdinal("access_max_consumer_groups")),
            MaxEventsPerSecond = reader.IsDBNull(reader.GetOrdinal("access_max_events_per_second"))
                ? null
                : reader.GetInt64(reader.GetOrdinal("access_max_events_per_second"))
        };

        return config;
    }
}

Service Registration

Add registration methods to ServiceCollectionExtensions.cs:

/// <summary>
/// Registers PostgreSQL-based stream configuration store.
/// </summary>
public static IServiceCollection AddPostgresStreamConfiguration(
    this IServiceCollection services)
{
    if (services == null)
        throw new ArgumentNullException(nameof(services));

    services.Replace(ServiceDescriptor.Singleton<IStreamConfigurationStore, PostgresStreamConfigurationStore>());
    services.Replace(ServiceDescriptor.Singleton<IStreamConfigurationProvider, PostgresStreamConfigurationProvider>());

    return services;
}

Implementation Checklist

Phase 2.6.1: Core Interfaces ✅

Create StreamConfiguration model class
Create RetentionConfiguration model class
Create DeadLetterQueueConfiguration model class
Create LifecycleConfiguration model class
Create PerformanceConfiguration model class
Create AccessControlConfiguration model class
Create IStreamConfigurationStore interface
Create IStreamConfigurationProvider interface
Add validation methods to configuration classes
Build Abstractions package

Phase 2.6.2: PostgreSQL Implementation ✅

Create database migration for stream_configurations table
Implement PostgresStreamConfigurationStore
Implement PostgresStreamConfigurationProvider
Add service registration extensions
Implement configuration merging logic
Add caching for frequently accessed configurations (deferred - future optimization)
Build PostgreSQL package

Phase 2.6.3: Integration with Existing Features ⏸️ Deferred

Update RetentionPolicyService to use stream configurations
Update event stream store to respect stream configurations
Add DLQ support to event publishing
Implement lifecycle management background service
Add access control checks to stream operations
Build and test integration

Phase 2.6.4: Testing ⏸️ Deferred

Unit tests for configuration models
Unit tests for PostgresStreamConfigurationStore
Unit tests for configuration provider
Integration tests with retention policies
Integration tests with DLQ
Integration tests with lifecycle management

Phase 2.6.5: Documentation ✅

Update README.md with stream configuration examples
Update CLAUDE.md with architecture details
Add code examples for all configuration types
Document configuration precedence rules
Add migration guide for existing users

Usage Examples

Basic Stream Configuration

var configStore = serviceProvider.GetRequiredService<IStreamConfigurationStore>();

var config = new StreamConfiguration
{
    StreamName = "orders",
    Description = "Order processing stream",
    Tags = new Dictionary<string, string>
    {
        ["domain"] = "orders",
        ["environment"] = "production"
    },
    Retention = new RetentionConfiguration
    {
        MaxAge = TimeSpan.FromDays(90),
        MaxSizeBytes = 10L * 1024 * 1024 * 1024, // 10 GB
        EnablePartitioning = true,
        PartitionInterval = TimeSpan.FromDays(7)
    },
    CreatedAt = DateTimeOffset.UtcNow,
    CreatedBy = "admin"
};

await configStore.SetConfigurationAsync(config);

Dead Letter Queue Configuration

var config = new StreamConfiguration
{
    StreamName = "payment-processing",
    DeadLetterQueue = new DeadLetterQueueConfiguration
    {
        Enabled = true,
        DeadLetterStreamName = "payment-processing-dlq",
        MaxDeliveryAttempts = 5,
        RetryDelay = TimeSpan.FromMinutes(5),
        StoreOriginalEvent = true,
        StoreErrorDetails = true
    },
    CreatedAt = DateTimeOffset.UtcNow
};

await configStore.SetConfigurationAsync(config);

Lifecycle Management

var config = new StreamConfiguration
{
    StreamName = "audit-logs",
    Lifecycle = new LifecycleConfiguration
    {
        AutoCreate = true,
        AutoArchive = true,
        ArchiveAfter = TimeSpan.FromDays(365),
        ArchiveLocation = "s3://archive-bucket/audit-logs",
        AutoDelete = false
    },
    CreatedAt = DateTimeOffset.UtcNow
};

await configStore.SetConfigurationAsync(config);

Performance Tuning

var config = new StreamConfiguration
{
    StreamName = "high-throughput-events",
    Performance = new PerformanceConfiguration
    {
        BatchSize = 1000,
        EnableCompression = true,
        CompressionAlgorithm = "gzip",
        EnableIndexing = true,
        IndexedFields = new List<string> { "userId", "tenantId", "eventType" },
        CacheSize = 10000
    },
    CreatedAt = DateTimeOffset.UtcNow
};

await configStore.SetConfigurationAsync(config);

Access Control

var config = new StreamConfiguration
{
    StreamName = "sensitive-data",
    AccessControl = new AccessControlConfiguration
    {
        PublicRead = false,
        PublicWrite = false,
        AllowedReaders = new List<string> { "admin", "audit-service" },
        AllowedWriters = new List<string> { "admin", "data-ingestion-service" },
        MaxConsumerGroups = 5,
        MaxEventsPerSecond = 10000
    },
    CreatedAt = DateTimeOffset.UtcNow
};

await configStore.SetConfigurationAsync(config);

Getting Effective Configuration

var configProvider = serviceProvider.GetRequiredService<IStreamConfigurationProvider>();

// Gets merged configuration (stream-specific + global defaults)
var effectiveConfig = await configProvider.GetEffectiveConfigurationAsync("orders");

// Get specific configuration sections
var retention = await configProvider.GetRetentionConfigurationAsync("orders");
var dlq = await configProvider.GetDeadLetterQueueConfigurationAsync("orders");
var lifecycle = await configProvider.GetLifecycleConfigurationAsync("orders");

Finding Configurations

// Find all streams with archiving enabled
var archivingStreams = await configStore.FindConfigurationsAsync(
    c => c.Lifecycle?.AutoArchive == true);

// Find all production streams
var productionStreams = await configStore.FindConfigurationsAsync(
    c => c.Tags?.ContainsKey("environment") == true &&
         c.Tags["environment"] == "production");

Success Criteria

All configuration models implemented with validation
PostgreSQL store successfully manages stream configurations
Configuration provider correctly merges stream and global settings
Retention policies respect per-stream configuration (deferred to future phase)
DLQ functionality working with configuration (deferred to future phase)
Lifecycle management background service operational (deferred to future phase)
Access control enforced on stream operations (deferred to future phase)
Documentation complete with examples
Zero build errors (only pre-existing warnings)
Integration with existing event streaming features (deferred to future phase)

Note: Phase 2.6 successfully implemented the core infrastructure for stream configuration. Integration with existing features (retention policies, DLQ, lifecycle management, access control) has been deferred to allow for incremental adoption and testing.

Future Enhancements

Configuration UI: Web-based interface for managing stream configurations
Configuration Versioning: Track configuration changes over time
Configuration Templates: Reusable configuration templates
Configuration Validation: Advanced validation rules and constraints
Configuration Import/Export: Bulk configuration management
Configuration API: REST/gRPC API for configuration management
Configuration Events: Publish events when configurations change
Multi-tenant Configuration: Tenant-specific configuration overrides

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