Wire NowPlayingStats to live aggregates: add SQL track duration column, stats endpoint, and duration backfill

DeepDrftAPI/Controllers/StatsController.cs

@@ -0,0 +1,36 @@
+using DeepDrftData;
+using Microsoft.AspNetCore.Mvc;
+
+namespace DeepDrftAPI.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+public class StatsController : ControllerBase
+{
+    private readonly ITrackService _sqlTrackService;
+    private readonly ILogger<StatsController> _logger;
+
+    public StatsController(ITrackService sqlTrackService, ILogger<StatsController> logger)
+    {
+        _sqlTrackService = sqlTrackService;
+        _logger = logger;
+    }
+
+    // GET api/stats/home (unauthenticated)
+    // Aggregate figures behind the public home hero stat row — one read for all three cards. Same auth
+    // posture as the other public browse reads (GET api/track/page). The aggregation lives in the SQL
+    // service/repository; this controller stays a thin HTTP boundary.
+    [HttpGet("home")]
+    public async Task<ActionResult> GetHome(CancellationToken ct = default)
+    {
+        var result = await _sqlTrackService.GetHomeStats(ct);
+        if (!result.Success || result.Value is null)
+        {
+            var error = result.Messages.FirstOrDefault()?.Message ?? "Unknown error";
+            _logger.LogError("GetHome stats failed: {Error}", error);
+            return StatusCode(500, "Failed to load stats");
+        }
+
+        return Ok(result.Value);
+    }
+}

DeepDrftAPI/Controllers/TrackController.cs

@@ -173,6 +173,26 @@ public class TrackController : ControllerBase
         return Ok(status);
     }
 
+    // POST api/track/duration/backfill ([ApiKeyAuthorize], no body)
+    // One-time admin backfill: for every track whose SQL duration is still null, read the duration from
+    // the vault audio and write it to SQL. Mirrors the waveform backfill posture. Idempotent — a re-run
+    // only touches still-missing rows. Returns { updated, skipped }. Declared in the literal-route block
+    // (before "{trackId}") so the segment is never treated as a trackId.
+    [ApiKeyAuthorize]
+    [HttpPost("duration/backfill")]
+    public async Task<ActionResult> BackfillDurations(CancellationToken cancellationToken)
+    {
+        var result = await _unifiedService.BackfillDurationsAsync(cancellationToken);
+        if (!result.Success)
+        {
+            var error = result.Messages.FirstOrDefault()?.Message ?? "Unknown error";
+            _logger.LogError("BackfillDurations failed: {Error}", error);
+            return StatusCode(500, error);
+        }
+
+        return Ok(new { updated = result.Value.Updated, skipped = result.Value.Skipped });
+    }
+
     // POST api/track/upload: raw audio in (multipart/form-data) + metadata → persisted TrackDto out.
     // Accepts .wav, .mp3, and .flac. Used by the CMS upload flow on DeepDrftManager; that host
     // proxies the upload here so it never touches the vault disk path or SQL directly.

DeepDrftAPI/Services/UnifiedTrackService.cs

@@ -193,6 +193,54 @@ public class UnifiedTrackService
         }
     }
 
+    /// <summary>
+    /// One-time backfill: for every non-deleted track whose SQL duration is still null, read the
+    /// processor-extracted runtime from the vault audio (by EntryKey) and write it to SQL. The migration
+    /// cannot read the vault, so this runs at runtime after deploy. Idempotent — a re-run only touches
+    /// rows still missing a duration. Returns (updated, skipped) counts. A per-track vault miss or SQL
+    /// failure is logged and skipped, never aborting the batch.
+    /// </summary>
+    public async Task<ResultContainer<(int Updated, int Skipped)>> BackfillDurationsAsync(CancellationToken ct)
+    {
+        var missing = await _sqlTrackService.GetTracksMissingDuration(ct);
+        if (!missing.Success || missing.Value is null)
+        {
+            var error = missing.Messages.FirstOrDefault()?.Message ?? "Unknown error";
+            _logger.LogError("BackfillDurationsAsync: failed to load tracks missing duration: {Error}", error);
+            return ResultContainer<(int, int)>.CreateFailResult($"Could not load tracks: {error}");
+        }
+
+        var updated = 0;
+        var skipped = 0;
+        foreach (var track in missing.Value)
+        {
+            ct.ThrowIfCancellationRequested();
+
+            var audio = await _contentTrackContentService.GetAudioBinaryAsync(track.EntryKey);
+            if (audio is null)
+            {
+                _logger.LogWarning("BackfillDurationsAsync: no vault audio for {EntryKey} (track {Id}); skipping.",
+                    track.EntryKey, track.Id);
+                skipped++;
+                continue;
+            }
+
+            var write = await _sqlTrackService.UpdateDuration(track.Id, audio.Duration, ct);
+            if (!write.Success)
+            {
+                var error = write.Messages.FirstOrDefault()?.Message ?? "Unknown error";
+                _logger.LogWarning("BackfillDurationsAsync: SQL update failed for track {Id}: {Error}", track.Id, error);
+                skipped++;
+                continue;
+            }
+
+            updated++;
+        }
+
+        _logger.LogInformation("BackfillDurationsAsync complete: {Updated} updated, {Skipped} skipped.", updated, skipped);
+        return ResultContainer<(int, int)>.CreatePassResult((updated, skipped));
+    }
+
     /// <summary>
     /// Delete a track's SQL row, then its vault entry. SQL is the source of truth: a SQL delete
     /// failure fails the operation (and leaves the vault untouched), but a subsequent vault delete

DeepDrftContent/TrackContentService.cs

@@ -74,7 +74,10 @@ public class TrackContentService
             {
                 EntryKey = trackId, // FileDatabase entry ID
                 TrackName = trackName,
-                OriginalFileName = originalFileName
+                OriginalFileName = originalFileName,
+                // Persist the processor-extracted runtime to SQL so aggregate queries (total mix runtime)
+                // need not touch the vault. Same value the high-res waveform compute reads downstream.
+                DurationSeconds = audioBinary.Duration
             };
 
             return trackEntity;

DeepDrftData/Data/Configurations/TrackConfiguration.cs

@@ -39,6 +39,10 @@ public class TrackConfiguration : BaseEntityConfiguration<TrackEntity>
             .HasColumnName("track_number")
             .HasDefaultValue(1);
 
+        // Nullable: existing rows carry NULL until the one-time duration backfill populates them.
+        builder.Property(e => e.DurationSeconds)
+            .HasColumnName("duration_seconds");
+
         builder.Property(e => e.ReleaseId)
             .HasColumnName("release_id");
 

DeepDrftData/ITrackService.cs

@@ -28,6 +28,25 @@ public interface ITrackService
     /// <summary>Distinct non-null genres with track counts, genre-ascending.</summary>
     Task<ResultContainer<List<GenreSummaryDto>>> GetDistinctGenres(CancellationToken cancellationToken = default);
 
+    /// <summary>
+    /// Aggregate figures behind the public home hero stat row: Cut track count + per-ReleaseType Cut
+    /// release breakdown, Mix release count, and total Mix runtime in seconds. One read for all three cards.
+    /// </summary>
+    Task<ResultContainer<HomeStatsDto>> GetHomeStats(CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Non-deleted tracks whose SQL duration is still null — the work list for the one-time duration
+    /// backfill. The backfill reads each track's stored duration from the vault and writes it via
+    /// <see cref="UpdateDuration"/>.
+    /// </summary>
+    Task<ResultContainer<List<TrackDto>>> GetTracksMissingDuration(CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Set the SQL duration for one track. Idempotent: a track whose duration is already set is left
+    /// untouched. Backs the duration backfill. Returns the number of rows updated (0 or 1).
+    /// </summary>
+    Task<ResultContainer<int>> UpdateDuration(long id, double durationSeconds, CancellationToken cancellationToken = default);
+
     /// <summary>
     /// Resolve the release matching <paramref name="title"/> + <paramref name="artist"/>, creating
     /// one from <paramref name="releaseData"/> when none exists. Backs the upload flow's FK

DeepDrftData/Migrations/20260618155002_AddTrackDuration.Designer.cs

@@ -0,0 +1,322 @@
+// <auto-generated />
+using System;
+using DeepDrftData.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace DeepDrftData.Migrations
+{
+    [DbContext(typeof(DeepDrftContext))]
+    [Migration("20260618155002_AddTrackDuration")]
+    partial class AddTrackDuration
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "10.0.7")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("DeepDrftModels.Entities.MixMetadata", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint")
+                        .HasColumnName("id");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at");
+
+                    b.Property<bool>("IsDeleted")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("is_deleted");
+
+                    b.Property<long>("ReleaseId")
+                        .HasColumnType("bigint")
+                        .HasColumnName("release_id");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at");
+
+                    b.Property<string>("WaveformEntryKey")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("waveform_entry_key");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("IsDeleted")
+                        .HasDatabaseName("IX_mix_metadata_is_deleted");
+
+                    b.HasIndex("ReleaseId")
+                        .IsUnique()
+                        .HasDatabaseName("IX_mix_metadata_release_id");
+
+                    b.ToTable("mix_metadata", (string)null);
+                });
+
+            modelBuilder.Entity("DeepDrftModels.Entities.ReleaseEntity", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint")
+                        .HasColumnName("id");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<string>("Artist")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("artist");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at");
+
+                    b.Property<long?>("CreatedByUserId")
+                        .HasColumnType("bigint")
+                        .HasColumnName("created_by_user_id");
+
+                    b.Property<string>("Description")
+                        .HasMaxLength(4000)
+                        .HasColumnType("character varying(4000)")
+                        .HasColumnName("description");
+
+                    b.Property<string>("EntryKey")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("entry_key");
+
+                    b.Property<string>("Genre")
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("genre");
+
+                    b.Property<string>("ImagePath")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("image_path");
+
+                    b.Property<bool>("IsDeleted")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("is_deleted");
+
+                    b.Property<string>("Medium")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasDefaultValue("Cut")
+                        .HasColumnName("medium");
+
+                    b.Property<DateOnly?>("ReleaseDate")
+                        .HasColumnType("date")
+                        .HasColumnName("release_date");
+
+                    b.Property<string>("ReleaseType")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)")
+                        .HasDefaultValue("Single")
+                        .HasColumnName("release_type");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("title");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("EntryKey")
+                        .IsUnique()
+                        .HasDatabaseName("IX_release_entry_key");
+
+                    b.HasIndex("IsDeleted")
+                        .HasDatabaseName("IX_release_is_deleted");
+
+                    b.HasIndex("Title", "Artist")
+                        .IsUnique()
+                        .HasDatabaseName("IX_release_title_artist")
+                        .HasFilter("\"is_deleted\" = false");
+
+                    b.ToTable("release", (string)null);
+                });
+
+            modelBuilder.Entity("DeepDrftModels.Entities.SessionMetadata", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint")
+                        .HasColumnName("id");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at");
+
+                    b.Property<string>("HeroImageEntryKey")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("hero_image_entry_key");
+
+                    b.Property<bool>("IsDeleted")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("is_deleted");
+
+                    b.Property<long>("ReleaseId")
+                        .HasColumnType("bigint")
+                        .HasColumnName("release_id");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("IsDeleted")
+                        .HasDatabaseName("IX_session_metadata_is_deleted");
+
+                    b.HasIndex("ReleaseId")
+                        .IsUnique()
+                        .HasDatabaseName("IX_session_metadata_release_id");
+
+                    b.ToTable("session_metadata", (string)null);
+                });
+
+            modelBuilder.Entity("DeepDrftModels.Entities.TrackEntity", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint")
+                        .HasColumnName("id");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at");
+
+                    b.Property<double?>("DurationSeconds")
+                        .HasColumnType("double precision")
+                        .HasColumnName("duration_seconds");
+
+                    b.Property<string>("EntryKey")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("entry_key");
+
+                    b.Property<bool>("IsDeleted")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("is_deleted");
+
+                    b.Property<string>("OriginalFileName")
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("original_file_name");
+
+                    b.Property<long?>("ReleaseId")
+                        .HasColumnType("bigint")
+                        .HasColumnName("release_id");
+
+                    b.Property<string>("TrackName")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("track_name");
+
+                    b.Property<int>("TrackNumber")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasDefaultValue(1)
+                        .HasColumnName("track_number");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("IsDeleted")
+                        .HasDatabaseName("IX_track_is_deleted");
+
+                    b.HasIndex("ReleaseId");
+
+                    b.ToTable("track", (string)null);
+                });
+
+            modelBuilder.Entity("DeepDrftModels.Entities.MixMetadata", b =>
+                {
+                    b.HasOne("DeepDrftModels.Entities.ReleaseEntity", "Release")
+                        .WithOne("MixMetadata")
+                        .HasForeignKey("DeepDrftModels.Entities.MixMetadata", "ReleaseId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Release");
+                });
+
+            modelBuilder.Entity("DeepDrftModels.Entities.SessionMetadata", b =>
+                {
+                    b.HasOne("DeepDrftModels.Entities.ReleaseEntity", "Release")
+                        .WithOne("SessionMetadata")
+                        .HasForeignKey("DeepDrftModels.Entities.SessionMetadata", "ReleaseId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Release");
+                });
+
+            modelBuilder.Entity("DeepDrftModels.Entities.TrackEntity", b =>
+                {
+                    b.HasOne("DeepDrftModels.Entities.ReleaseEntity", "Release")
+                        .WithMany("Tracks")
+                        .HasForeignKey("ReleaseId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.Navigation("Release");
+                });
+
+            modelBuilder.Entity("DeepDrftModels.Entities.ReleaseEntity", b =>
+                {
+                    b.Navigation("MixMetadata");
+
+                    b.Navigation("SessionMetadata");
+
+                    b.Navigation("Tracks");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

DeepDrftData/Migrations/20260618155002_AddTrackDuration.cs

@@ -0,0 +1,28 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace DeepDrftData.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddTrackDuration : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<double>(
+                name: "duration_seconds",
+                table: "track",
+                type: "double precision",
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "duration_seconds",
+                table: "track");
+        }
+    }
+}

DeepDrftData/Migrations/DeepDrftContextModelSnapshot.cs

@@ -222,6 +222,10 @@ namespace DeepDrftData.Migrations
                         .HasColumnType("timestamp with time zone")
                         .HasColumnName("created_at");
 
+                    b.Property<double?>("DurationSeconds")
+                        .HasColumnType("double precision")
+                        .HasColumnName("duration_seconds");
+
                     b.Property<string>("EntryKey")
                         .IsRequired()
                         .HasMaxLength(100)

DeepDrftData/Repositories/TrackRepository.cs

@@ -3,6 +3,7 @@ using Data.Errors;
 using DeepDrftData.Data;
 using DeepDrftModels.DTOs;
 using DeepDrftModels.Entities;
+using DeepDrftModels.Enums;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
 using Models.Common;
@@ -157,6 +158,57 @@ public class TrackRepository : Repository<DeepDrftContext, TrackEntity>
             .Select(g => new { ReleaseId = g.Key, Count = g.Count() })
             .ToDictionaryAsync(x => x.ReleaseId, x => x.Count, ct);
 
+    // Aggregate figures for the public home hero stat row, assembled in as few round-trips as is clean.
+    // All counts go through Query / the release set's !IsDeleted filter so soft-deleted rows never count.
+    // Mix runtime sums DurationSeconds with a null-coalesce to 0 so not-yet-backfilled rows contribute
+    // zero rather than throwing or skewing the total. The cut release-type breakdown is grouped here so
+    // a zero-count type is simply absent from the result (no present-with-zero row).
+    public async Task<HomeStatsDto> GetHomeStatsAsync(CancellationToken ct = default)
+    {
+        var releases = _context.Set<ReleaseEntity>().Where(r => !r.IsDeleted);
+
+        var cutTrackCount = await Query
+            .CountAsync(t => t.Release != null && t.Release.Medium == ReleaseMedium.Cut, ct);
+
+        var cutReleaseTypeCounts = await releases
+            .Where(r => r.Medium == ReleaseMedium.Cut)
+            .GroupBy(r => r.ReleaseType)
+            .Select(g => new CutReleaseTypeCount { ReleaseType = g.Key, Count = g.Count() })
+            .ToListAsync(ct);
+
+        var mixReleaseCount = await releases
+            .CountAsync(r => r.Medium == ReleaseMedium.Mix, ct);
+
+        var mixRuntimeSeconds = await Query
+            .Where(t => t.Release != null && t.Release.Medium == ReleaseMedium.Mix)
+            .SumAsync(t => t.DurationSeconds ?? 0d, ct);
+
+        return new HomeStatsDto
+        {
+            CutTrackCount = cutTrackCount,
+            CutReleaseTypeCounts = cutReleaseTypeCounts,
+            MixReleaseCount = mixReleaseCount,
+            MixRuntimeSeconds = mixRuntimeSeconds,
+        };
+    }
+
+    // EntryKey + stored duration for non-deleted tracks whose SQL duration is still null — the work list
+    // the one-time duration backfill iterates. The migration cannot read the vault, so duration is filled
+    // at runtime: this lists which rows still need it, the backfill reads each from the vault and writes
+    // it back via UpdateDurationAsync.
+    public async Task<List<TrackEntity>> GetTracksMissingDurationAsync(CancellationToken ct = default)
+        => await Query.Where(t => t.DurationSeconds == null).ToListAsync(ct);
+
+    // Set-based duration write for one track (no load round-trip), used by the backfill. The
+    // DurationSeconds == null guard keeps a re-run from re-stamping updated_at on an already-filled row
+    // and from clobbering a value the upload path may have set in the meantime.
+    public async Task<int> UpdateDurationAsync(long id, double durationSeconds, CancellationToken ct = default)
+        => await Query
+            .Where(t => t.Id == id && t.DurationSeconds == null)
+            .ExecuteUpdateAsync(s => s
+                .SetProperty(t => t.DurationSeconds, durationSeconds)
+                .SetProperty(t => t.UpdatedAt, DateTime.UtcNow), ct);
+
     // Resolve an existing release by its natural key (title + artist). Returns null when no match,
     // signalling the manager to create one. Soft-deleted releases never match.
     public async Task<ReleaseEntity?> GetReleaseByTitleAndArtistAsync(
@@ -211,6 +263,7 @@ public class TrackRepository : Repository<DeepDrftContext, TrackEntity>
         target.TrackName = source.TrackName;
         target.TrackNumber = source.TrackNumber;
         target.OriginalFileName = source.OriginalFileName;
+        target.DurationSeconds = source.DurationSeconds;
         target.ReleaseId = source.ReleaseId;
     }
 }

DeepDrftData/TrackConverter.cs

@@ -80,6 +80,7 @@ public class TrackConverter : IEntityToModelConverter<TrackEntity, TrackDto>
         TrackName = entity.TrackName,
         OriginalFileName = entity.OriginalFileName,
         TrackNumber = entity.TrackNumber,
+        DurationSeconds = entity.DurationSeconds,
         ReleaseId = entity.ReleaseId,
         Release = entity.Release is null ? null : Convert(entity.Release)
     };
@@ -96,6 +97,7 @@ public class TrackConverter : IEntityToModelConverter<TrackEntity, TrackDto>
         TrackName = model.TrackName,
         OriginalFileName = model.OriginalFileName,
         TrackNumber = model.TrackNumber,
+        DurationSeconds = model.DurationSeconds,
         ReleaseId = model.ReleaseId
     };
 }

DeepDrftData/TrackManager.cs

@@ -236,6 +236,46 @@ public class TrackManager
         }
     }
 
+    public async Task<ResultContainer<HomeStatsDto>> GetHomeStats(CancellationToken cancellationToken = default)
+    {
+        try
+        {
+            var stats = await Repository.GetHomeStatsAsync(cancellationToken);
+            return ResultContainer<HomeStatsDto>.CreatePassResult(stats);
+        }
+        catch (Exception e)
+        {
+            return ResultContainer<HomeStatsDto>.CreateFailResult(e.Message);
+        }
+    }
+
+    public async Task<ResultContainer<List<TrackDto>>> GetTracksMissingDuration(CancellationToken cancellationToken = default)
+    {
+        try
+        {
+            var entities = await Repository.GetTracksMissingDurationAsync(cancellationToken);
+            return ResultContainer<List<TrackDto>>.CreatePassResult(
+                entities.Select(TrackConverter.Convert).ToList());
+        }
+        catch (Exception e)
+        {
+            return ResultContainer<List<TrackDto>>.CreateFailResult(e.Message);
+        }
+    }
+
+    public async Task<ResultContainer<int>> UpdateDuration(long id, double durationSeconds, CancellationToken cancellationToken = default)
+    {
+        try
+        {
+            var updated = await Repository.UpdateDurationAsync(id, durationSeconds, cancellationToken);
+            return ResultContainer<int>.CreatePassResult(updated);
+        }
+        catch (Exception e)
+        {
+            return ResultContainer<int>.CreateFailResult(e.Message);
+        }
+    }
+
     public async Task<ResultContainer<TrackDto>> Create(TrackDto newTrack)
     {
         try

DeepDrftModels/DTOs/HomeStatsDto.cs

@@ -0,0 +1,37 @@
+using DeepDrftModels.Enums;
+
+namespace DeepDrftModels.DTOs;
+
+/// <summary>
+/// Aggregate figures behind the public home hero stat row (NowPlayingStats). A single read returns
+/// everything the three cards need so the client makes one round-trip. All counts exclude soft-deleted
+/// rows. The Plays card is a static placeholder and has no field here.
+/// </summary>
+public class HomeStatsDto
+{
+    /// <summary>Total non-deleted tracks whose release is the Cut medium. The Studio Cuts card's primary figure.</summary>
+    public int CutTrackCount { get; set; }
+
+    /// <summary>
+    /// Per-ReleaseType counts of non-deleted Cut releases. Only types with at least one release are
+    /// present — a zero-count type is absent from the list (the card suppresses it). The Studio Cuts
+    /// card's secondary breakdown.
+    /// </summary>
+    public List<CutReleaseTypeCount> CutReleaseTypeCounts { get; set; } = [];
+
+    /// <summary>Total non-deleted releases of the Mix medium. The Mixes card's primary figure ("N Sets").</summary>
+    public int MixReleaseCount { get; set; }
+
+    /// <summary>
+    /// Sum of DurationSeconds across all non-deleted tracks on Mix releases. Tracks with a null
+    /// duration (not yet backfilled) contribute 0. The Mixes card's secondary figure, rendered hh:mm.
+    /// </summary>
+    public double MixRuntimeSeconds { get; set; }
+}
+
+/// <summary>One row of the Cut release-type breakdown: a ReleaseType and how many Cut releases have it.</summary>
+public class CutReleaseTypeCount
+{
+    public ReleaseType ReleaseType { get; set; }
+    public int Count { get; set; }
+}

DeepDrftModels/DTOs/TrackDto.cs

@@ -16,6 +16,7 @@ public class TrackDto : BaseModel
     public string TrackName { get; set; } = string.Empty;
     public string? OriginalFileName { get; set; }
     public int TrackNumber { get; set; } = 1;
+    public double? DurationSeconds { get; set; }
     public long? ReleaseId { get; set; }
     public ReleaseDto? Release { get; set; }
 }

DeepDrftModels/Entities/TrackEntity.cs

@@ -15,6 +15,10 @@ public class TrackEntity : BaseEntity, IEntity
     public required string TrackName { get; set; }
     public string? OriginalFileName { get; set; }
     public int TrackNumber { get; set; } = 1;
+    // Audio runtime in seconds, extracted by the processor at upload (AudioBinary.Duration) and
+    // persisted here so aggregate queries (e.g. total mix runtime) read it from SQL rather than the
+    // vault. Nullable: rows that predate this column are valid until the one-time backfill populates them.
+    public double? DurationSeconds { get; set; }
     public long? ReleaseId { get; set; }
     public ReleaseEntity? Release { get; set; }
 }

DeepDrftPublic.Client/Clients/StatsClient.cs

@@ -0,0 +1,39 @@
+using DeepDrftModels.DTOs;
+using NetBlocks.Models;
+using System.Text.Json;
+
+namespace DeepDrftPublic.Client.Clients;
+
+/// <summary>
+/// HTTP client for the public stats read surface. Uses the named <c>"DeepDrft.API"</c> client like
+/// <see cref="TrackClient"/> and <see cref="ReleaseClient"/>: on WASM it points at the public host and
+/// proxies through <c>StatsProxyController</c>; on SSR prerender it points directly at DeepDrftAPI. The
+/// route is an unauthenticated read; the response deserializes as a bare DTO (no ApiResultDto envelope),
+/// matching the API's <c>Ok(value)</c> shape.
+/// </summary>
+public class StatsClient
+{
+    private static readonly JsonSerializerOptions JsonOptions = new() { PropertyNameCaseInsensitive = true };
+
+    private readonly HttpClient _http;
+
+    public StatsClient(IHttpClientFactory httpClientFactory)
+    {
+        _http = httpClientFactory.CreateClient("DeepDrft.API");
+    }
+
+    public async Task<ApiResult<HomeStatsDto>> GetHomeStats()
+    {
+        var response = await _http.GetAsync("api/stats/home");
+
+        if (!response.IsSuccessStatusCode)
+            return ApiResult<HomeStatsDto>.CreateFailResult($"HTTP {(int)response.StatusCode}");
+
+        var json = await response.Content.ReadAsStringAsync();
+        var stats = JsonSerializer.Deserialize<HomeStatsDto>(json, JsonOptions);
+
+        return stats is not null
+            ? ApiResult<HomeStatsDto>.CreatePassResult(stats)
+            : ApiResult<HomeStatsDto>.CreateFailResult("Failed to deserialize response");
+    }
+}

DeepDrftPublic.Client/Controls/NowPlaying.razor

@@ -31,7 +31,8 @@
     <div class="now-playing-content">
         <NowPlayingCard />
 
-        @* Stat row - hard-coded for now. TODO Phase 2: wire to real track count / identity model. *@
+        @* Stat row — live aggregate figures (Cut track count + type breakdown, Mix sets + runtime);
+           the Plays card is a static placeholder pending real play tracking. *@
         <NowPlayingStats />
     </div>
 </div>

DeepDrftPublic.Client/Controls/NowPlayingStats.razor

@@ -1,14 +1,94 @@
+@using DeepDrftModels.DTOs
+@using DeepDrftModels.Enums
+@using DeepDrftPublic.Client.Helpers
+@using DeepDrftPublic.Client.Services
+@implements IDisposable
+
 <div class="hero-stat-row">
+    @* Studio Cuts — primary figure is the total Cut-medium track count; the secondary breakdown lists
+       per-ReleaseType Cut release counts, zero-count types already suppressed server-side. *@
     <div class="hero-stat">
-        <div class="hero-stat-num">47+</div>
+        <div class="hero-stat-num">@_stats.CutTrackCount</div>
-        <div class="hero-stat-label">Live Sessions</div>
+        <div class="hero-stat-label">Studio Cuts</div>
+        @if (_stats.CutReleaseTypeCounts.Count > 0)
+        {
+            <div class="hero-stat-breakdown">
+                @foreach (var row in _stats.CutReleaseTypeCounts)
+                {
+                    <span class="hero-stat-breakdown-item">@row.Count @PluralizeReleaseType(row.ReleaseType, row.Count)</span>
+                }
             </div>
+        }
+    </div>
+
+    @* Mixes — primary figure is the Mix release count labelled "Sets"; the secondary figure is total
+       mix runtime as hh:mm. *@
     <div class="hero-stat">
-        <div class="hero-stat-num">2</div>
+        <div class="hero-stat-num">@_stats.MixReleaseCount</div>
-        <div class="hero-stat-label">Members</div>
+        <div class="hero-stat-label">Sets</div>
+        <div class="hero-stat-sub">@RuntimeFormat.ToHoursMinutes(_stats.MixRuntimeSeconds) runtime</div>
     </div>
+
+    @* Plays — static placeholder (real play/share tracking is a future phase). Odometer treatment over
+       the existing card style; copy is placeholder pending sign-off. *@
     <div class="hero-stat">
-        <div class="hero-stat-num">&infin;</div>
+        <div class="hero-stat-num hero-stat-odometer">XXX</div>
-        <div class="hero-stat-label">Drift Points</div>
+        <div class="hero-stat-label">Plays (Coming Soon)</div>
     </div>
 </div>
+
+@code {
+    [Inject] public required IStatsDataService StatsData { get; set; }
+    [Inject] public required PersistentComponentState PersistentState { get; set; }
+
+    private const string PersistKey = "home-stats";
+
+    private HomeStatsDto _stats = new();
+    private bool _loaded;
+    private PersistingComponentStateSubscription _persistingSubscription;
+
+    protected override async Task OnInitializedAsync()
+    {
+        _persistingSubscription = PersistentState.RegisterOnPersisting(Persist);
+
+        // Bridge the prerendered fetch across the prerender -> WASM seam so the WASM boot does not
+        // re-fetch and flicker the figures (the TracksView persistent-state seam, applied to stats).
+        if (PersistentState.TryTakeFromJson<HomeStatsDto>(PersistKey, out var restored) && restored is not null)
+        {
+            _stats = restored;
+            _loaded = true;
+            return;
+        }
+
+        var result = await StatsData.GetHomeStats();
+        if (result is { Success: true, Value: { } stats })
+        {
+            _stats = stats;
+            _loaded = true;
+        }
+    }
+
+    // Only bridge a successful fetch. If prerender failed, persist nothing so the WASM pass re-fetches
+    // rather than restoring zeros — mirrors the guard on the medium-browse persist path.
+    private Task Persist()
+    {
+        if (_loaded)
+            PersistentState.PersistAsJson(PersistKey, _stats);
+        return Task.CompletedTask;
+    }
+
+    private static string PluralizeReleaseType(ReleaseType type, int count)
+    {
+        var label = type switch
+        {
+            ReleaseType.Single => "Single",
+            ReleaseType.EP => "EP",
+            ReleaseType.Album => "Album",
+            _ => type.ToString()
+        };
+        // EP pluralizes as "EPs"; Single/Album take a plain trailing s.
+        return count == 1 ? label : label + "s";
+    }
+
+    public void Dispose() => _persistingSubscription.Dispose();
+}

DeepDrftPublic.Client/Controls/NowPlayingStats.razor.css

@@ -27,6 +27,42 @@
     margin-top: 0.4rem;
 }
 
+/* Studio Cuts per-ReleaseType breakdown — mono caption rows below the label, reusing the label's
+   palette so the card reads as one block. */
+.hero-stat-breakdown {
+    display: flex;
+    flex-direction: column;
+    gap: 0.1rem;
+    margin-top: 0.5rem;
+}
+
+.hero-stat-breakdown-item {
+    font-family: var(--deepdrft-font-mono);
+    font-size: 0.58rem;
+    letter-spacing: 0.12em;
+    color: rgba(250, 250, 248, 0.55);
+}
+
+/* Mixes runtime sub-figure — sits under the label, slightly brighter than the label caption. */
+.hero-stat-sub {
+    font-family: var(--deepdrft-font-mono);
+    font-size: 0.58rem;
+    letter-spacing: 0.12em;
+    color: rgba(250, 250, 248, 0.55);
+    margin-top: 0.5rem;
+}
+
+/* Plays placeholder — a light 90s visitor-counter / odometer embellishment over the existing
+   numeric treatment: monospace digits, boxed and tracked out like a mechanical counter. */
+.hero-stat-odometer {
+    font-family: var(--deepdrft-font-mono);
+    letter-spacing: 0.18em;
+    background: rgba(0, 0, 0, 0.35);
+    border: 1px solid rgba(250, 250, 248, 0.12);
+    padding: 0.1rem 0.35rem;
+    display: inline-block;
+}
+
 @media (max-width: 599px) {
     .hero-stat-row {
         flex-direction: column;

DeepDrftPublic.Client/Helpers/RuntimeFormat.cs

@@ -0,0 +1,19 @@
+namespace DeepDrftPublic.Client.Helpers;
+
+/// <summary>
+/// Formats a runtime expressed in seconds as a compact <c>hh:mm</c> string for the home hero stat row.
+/// Hours are not zero-padded and may exceed two digits (mixes are few, so a large total simply renders
+/// "123:45"); minutes are always two digits. Negative or non-finite inputs clamp to "0:00".
+/// </summary>
+public static class RuntimeFormat
+{
+    public static string ToHoursMinutes(double totalSeconds)
+    {
+        if (double.IsNaN(totalSeconds) || double.IsInfinity(totalSeconds) || totalSeconds <= 0)
+            return "0:00";
+
+        var total = TimeSpan.FromSeconds(totalSeconds);
+        var hours = (int)total.TotalHours;
+        return $"{hours}:{total.Minutes:D2}";
+    }
+}

DeepDrftPublic.Client/Services/IStatsDataService.cs

@@ -0,0 +1,15 @@
+using DeepDrftModels.DTOs;
+using NetBlocks.Models;
+
+namespace DeepDrftPublic.Client.Services;
+
+/// <summary>
+/// Home-stats read abstraction. Both SSR and WASM renders are served by <c>StatsClientDataService</c>
+/// in this assembly, which delegates to <see cref="Clients.StatsClient"/> over HTTP. Components inject
+/// this single seam so they do not branch on render mode — mirrors <see cref="IReleaseDataService"/>.
+/// </summary>
+public interface IStatsDataService
+{
+    /// <summary>Aggregate figures behind the public home hero stat row, in one round-trip.</summary>
+    Task<ApiResult<HomeStatsDto>> GetHomeStats();
+}

DeepDrftPublic.Client/Services/StatsClientDataService.cs

@@ -0,0 +1,22 @@
+using DeepDrftModels.DTOs;
+using DeepDrftPublic.Client.Clients;
+using NetBlocks.Models;
+
+namespace DeepDrftPublic.Client.Services;
+
+/// <summary>
+/// <see cref="IStatsDataService"/> backed by <see cref="StatsClient"/> (HTTP to the <c>DeepDrft.API</c>
+/// backend). Used on both the SSR prerender and WASM interactive passes — the stats read surface is
+/// HTTP-only, so there is no separate in-process implementation.
+/// </summary>
+public class StatsClientDataService : IStatsDataService
+{
+    private readonly StatsClient _statsClient;
+
+    public StatsClientDataService(StatsClient statsClient)
+    {
+        _statsClient = statsClient;
+    }
+
+    public Task<ApiResult<HomeStatsDto>> GetHomeStats() => _statsClient.GetHomeStats();
+}

DeepDrftPublic.Client/Startup.cs

@@ -26,6 +26,10 @@ public static class Startup
         services.AddScoped<ReleaseDetailViewModel>();
         services.AddScoped<CutDetailViewModel>();
 
+        // Home hero stats read surface — same HTTP posture as the track/release clients.
+        services.AddScoped<StatsClient>();
+        services.AddScoped<IStatsDataService, StatsClientDataService>();
+
         // Waveform visualizer controls — scoped so the eight slider positions persist across navigation
         // within a session and reset on a fresh page load (see WaveformVisualizerControlState).
         services.AddScoped<WaveformVisualizerControlState>();

DeepDrftPublic/Controllers/StatsProxyController.cs

@@ -0,0 +1,51 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace DeepDrftPublic.Controllers;
+
+/// <summary>
+/// Proxies the public stats read surface to DeepDrftAPI so the browser never makes a cross-origin
+/// request. Mirrors <see cref="ReleaseProxyController"/>: the WASM client issues relative
+/// <c>api/stats/*</c> requests against this host, which forwards them upstream. SSR prerender calls
+/// DeepDrftAPI directly via the same named client — no proxy hop on the server side. Unauthenticated read.
+/// </summary>
+[ApiController]
+[Route("api/stats")]
+public class StatsProxyController : ControllerBase
+{
+    private readonly HttpClient _upstream;
+    private readonly ILogger<StatsProxyController> _logger;
+
+    public StatsProxyController(IHttpClientFactory httpClientFactory, ILogger<StatsProxyController> logger)
+    {
+        _upstream = httpClientFactory.CreateClient("DeepDrft.API");
+        _logger = logger;
+    }
+
+    /// <summary>Proxies the home hero aggregate figures. Small JSON, buffered and relayed.</summary>
+    [HttpGet("home")]
+    public async Task<ActionResult> GetHome(CancellationToken ct = default)
+    {
+        HttpResponseMessage upstream;
+        try
+        {
+            upstream = await _upstream.GetAsync("api/stats/home", HttpCompletionOption.ResponseHeadersRead, ct);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Upstream call to DeepDrftAPI stats/home failed");
+            return StatusCode(502, "Upstream unavailable");
+        }
+
+        using (upstream)
+        {
+            if (!upstream.IsSuccessStatusCode)
+            {
+                _logger.LogWarning("DeepDrftAPI stats/home returned {Status}", (int)upstream.StatusCode);
+                return StatusCode((int)upstream.StatusCode);
+            }
+
+            var json = await upstream.Content.ReadAsStringAsync(ct);
+            return Content(json, "application/json");
+        }
+    }
+}

DeepDrftTests/HomeStatsQueryTests.cs

@@ -0,0 +1,152 @@
+using Data.Data.Repositories;
+using DeepDrftData.Data;
+using DeepDrftData.Repositories;
+using DeepDrftModels.Entities;
+using DeepDrftModels.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging.Abstractions;
+
+namespace DeepDrftTests;
+
+/// <summary>
+/// Aggregate-query tests for the public home hero stat row, exercising
+/// <see cref="TrackRepository.GetHomeStatsAsync"/>: the Cut track count, the per-ReleaseType Cut
+/// release breakdown (zero-count types absent), the Mix release count, and the Mix-runtime sum
+/// (null durations contributing 0). Runs on the EF in-memory provider like
+/// <see cref="ReleaseBrowseQueryTests"/> — every predicate here (Count, GroupBy, Sum with a
+/// null-coalesce) translates in process.
+/// </summary>
+[TestFixture]
+public class HomeStatsQueryTests
+{
+    private DeepDrftContext _context = null!;
+
+    [SetUp]
+    public void SetUp()
+    {
+        var options = new DbContextOptionsBuilder<DeepDrftContext>()
+            .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
+            .Options;
+        _context = new DeepDrftContext(options);
+    }
+
+    [TearDown]
+    public void TearDown() => _context.Dispose();
+
+    private TrackRepository CreateRepository()
+        => new(_context, NullLogger<Repository<DeepDrftContext, TrackEntity>>.Instance);
+
+    private static ReleaseEntity Release(
+        string title, ReleaseMedium medium, ReleaseType releaseType = ReleaseType.Single)
+        => new()
+        {
+            EntryKey = Guid.NewGuid().ToString("N"),
+            Title = title,
+            Artist = "A",
+            Medium = medium,
+            ReleaseType = releaseType,
+        };
+
+    private static TrackEntity Track(ReleaseEntity release, double? duration = null)
+        => new()
+        {
+            EntryKey = Guid.NewGuid().ToString("N"),
+            TrackName = "T",
+            Release = release,
+            DurationSeconds = duration,
+        };
+
+    private async Task SeedAsync(IEnumerable<ReleaseEntity> releases, IEnumerable<TrackEntity> tracks)
+    {
+        _context.Releases.AddRange(releases);
+        _context.Tracks.AddRange(tracks);
+        await _context.SaveChangesAsync();
+    }
+
+    // Cut track count reflects only tracks whose release is the Cut medium — Session and Mix tracks
+    // are excluded — given a mix of all three media.
+    [Test]
+    public async Task GetHomeStatsAsync_CutTrackCount_CountsOnlyCutMediumTracks()
+    {
+        var cut = Release("Cut", ReleaseMedium.Cut, ReleaseType.Album);
+        var session = Release("Session", ReleaseMedium.Session);
+        var mix = Release("Mix", ReleaseMedium.Mix);
+        await SeedAsync(
+            new[] { cut, session, mix },
+            new[] { Track(cut), Track(cut), Track(session), Track(mix) });
+
+        var stats = await CreateRepository().GetHomeStatsAsync();
+
+        Assert.That(stats.CutTrackCount, Is.EqualTo(2));
+    }
+
+    // The Cut release-type breakdown groups by ReleaseType, and a type with zero Cut releases is absent
+    // from the result entirely (not present-with-zero).
+    [Test]
+    public async Task GetHomeStatsAsync_CutReleaseTypeBreakdown_OmitsZeroCountTypes()
+    {
+        await SeedAsync(
+            new[]
+            {
+                Release("Cut Single 1", ReleaseMedium.Cut, ReleaseType.Single),
+                Release("Cut Single 2", ReleaseMedium.Cut, ReleaseType.Single),
+                Release("Cut Album", ReleaseMedium.Cut, ReleaseType.Album),
+                // A Mix release with ReleaseType.EP must not leak into the Cut breakdown.
+                Release("Mix EP", ReleaseMedium.Mix, ReleaseType.EP),
+            },
+            Array.Empty<TrackEntity>());
+
+        var stats = await CreateRepository().GetHomeStatsAsync();
+
+        Assert.That(stats.CutReleaseTypeCounts.Any(c => c.ReleaseType == ReleaseType.EP), Is.False,
+            "EP has zero Cut releases and must be absent, not present-with-zero");
+        Assert.That(stats.CutReleaseTypeCounts.Single(c => c.ReleaseType == ReleaseType.Single).Count, Is.EqualTo(2));
+        Assert.That(stats.CutReleaseTypeCounts.Single(c => c.ReleaseType == ReleaseType.Album).Count, Is.EqualTo(1));
+    }
+
+    // Mix release count counts Mix-medium releases, and the runtime sum tolerates null durations:
+    // not-yet-backfilled tracks contribute 0 rather than throwing or skewing the total.
+    [Test]
+    public async Task GetHomeStatsAsync_MixRuntime_TreatsNullDurationsAsZero()
+    {
+        var mixA = Release("Mix A", ReleaseMedium.Mix);
+        var mixB = Release("Mix B", ReleaseMedium.Mix);
+        var cut = Release("Cut", ReleaseMedium.Cut);
+        await SeedAsync(
+            new[] { mixA, mixB, cut },
+            new[]
+            {
+                Track(mixA, duration: 600d),
+                Track(mixB, duration: null),   // not yet backfilled — contributes 0
+                Track(cut, duration: 120d),    // Cut track must not count toward mix runtime
+            });
+
+        var stats = await CreateRepository().GetHomeStatsAsync();
+
+        Assert.That(stats.MixReleaseCount, Is.EqualTo(2));
+        Assert.That(stats.MixRuntimeSeconds, Is.EqualTo(600d));
+    }
+
+    // Soft-deleted releases and tracks never count toward any figure.
+    [Test]
+    public async Task GetHomeStatsAsync_ExcludesSoftDeletedRowsFromAllFigures()
+    {
+        var liveCut = Release("Live Cut", ReleaseMedium.Cut, ReleaseType.Album);
+        var deletedCut = Release("Dead Cut", ReleaseMedium.Cut, ReleaseType.Album);
+        deletedCut.IsDeleted = true;
+        var mix = Release("Mix", ReleaseMedium.Mix);
+
+        var deletedMixTrack = Track(mix, duration: 999d);
+        deletedMixTrack.IsDeleted = true;
+
+        await SeedAsync(
+            new[] { liveCut, deletedCut, mix },
+            new[] { Track(liveCut), deletedMixTrack });
+
+        var stats = await CreateRepository().GetHomeStatsAsync();
+
+        Assert.That(stats.CutTrackCount, Is.EqualTo(1));
+        Assert.That(stats.CutReleaseTypeCounts.Single(c => c.ReleaseType == ReleaseType.Album).Count, Is.EqualTo(1));
+        Assert.That(stats.MixRuntimeSeconds, Is.EqualTo(0d), "the only mix track is soft-deleted");
+    }
+}

DeepDrftTests/RuntimeFormatTests.cs

@@ -0,0 +1,40 @@
+using DeepDrftPublic.Client.Helpers;
+
+namespace DeepDrftTests;
+
+/// <summary>
+/// Unit tests for the home-stat-row runtime formatter (<see cref="RuntimeFormat.ToHoursMinutes"/>):
+/// the hh:mm shape, hour rollover past 60 minutes, multi-hour totals, and the clamp on non-positive /
+/// non-finite input.
+/// </summary>
+[TestFixture]
+public class RuntimeFormatTests
+{
+    // 12h34m -> "12:34": the brief's worked example, hours not zero-padded, minutes two digits.
+    [Test]
+    public void ToHoursMinutes_TwelveHoursThirtyFour_FormatsHhMm()
+        => Assert.That(RuntimeFormat.ToHoursMinutes((12 * 3600) + (34 * 60)), Is.EqualTo("12:34"));
+
+    // 90 minutes rolls into 1 hour 30 minutes — minutes never exceed 59.
+    [Test]
+    public void ToHoursMinutes_NinetyMinutes_RollsIntoHours()
+        => Assert.That(RuntimeFormat.ToHoursMinutes(90 * 60), Is.EqualTo("1:30"));
+
+    // Sub-hour totals show 0 hours with zero-padded minutes.
+    [Test]
+    public void ToHoursMinutes_UnderOneHour_ShowsZeroHours()
+        => Assert.That(RuntimeFormat.ToHoursMinutes(5 * 60), Is.EqualTo("0:05"));
+
+    // Totals beyond 99h are not truncated — hours simply take more than two digits (mixes are few).
+    [Test]
+    public void ToHoursMinutes_BeyondNinetyNineHours_DoesNotTruncate()
+        => Assert.That(RuntimeFormat.ToHoursMinutes((123 * 3600) + (45 * 60)), Is.EqualTo("123:45"));
+
+    // Zero / negative / non-finite inputs clamp to "0:00" rather than producing a negative or NaN render.
+    [TestCase(0d)]
+    [TestCase(-10d)]
+    [TestCase(double.NaN)]
+    [TestCase(double.PositiveInfinity)]
+    public void ToHoursMinutes_NonPositiveOrNonFinite_ClampsToZero(double seconds)
+        => Assert.That(RuntimeFormat.ToHoursMinutes(seconds), Is.EqualTo("0:00"));
+}