CUB-32: Add usage logging service with EF Core entity, service, controller, and migration

- Add multi-stage Dockerfile for backend (SDK build → ASP.NET runtime,
  non-root user, /health HEALTHCHECK)
- Add docker-compose.dev.yml orchestrating extrudex-api + control-center-web
- Add deploy.sh convenience script wrapping docker compose up --build
- Wire ASP.NET health checks: AddHealthChecks().AddNpgSql() + MapHealthChecks("/health")
- Add backend .dockerignore (comprehensive pattern list)
- Exclude frontend/dist, frontend/node_modules, frontend/.angular from git

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/dev.yml

@@ -0,0 +1,77 @@
+name: Dev Build
+
+on:
+  pull_request:
+    branches: [dev]
+  push:
+    branches: [dev]
+
+jobs:
+  build-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '9.0.x'
+
+      - name: Restore backend
+        run: dotnet restore
+
+      - name: Build backend
+        run: dotnet build --no-restore --configuration Release
+
+      - name: Test backend
+        run: dotnet test --no-build --configuration Release
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: "24"
+
+      - name: Install frontend deps
+        run: npm ci
+        working-directory: ./frontend
+
+      - name: Build frontend
+        run: npm run build
+        working-directory: ./frontend
+
+  deploy-dev:
+    needs: build-test
+    if: gitea.event_name == 'push'
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Deploy dev
+        run: |
+          echo "${{ secrets.DEV_DEPLOY_SSH_KEY }}" > /tmp/dev_key
+          chmod 600 /tmp/dev_key
+          ssh -i /tmp/dev_key -o StrictHostKeyChecking=no \
+            ${{ secrets.DEV_DEPLOY_USER }}@${{ secrets.DEV_DEPLOY_HOST }} \
+            "${{ secrets.DEV_DEPLOY_PATH }}/deploy.sh"
+
+  notify-success:
+    needs: [build-test, deploy-dev]
+    if: success() && gitea.event_name == 'push'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Notify Slack success
+        run: |
+          curl -X POST -H 'Content-type: application/json' \
+            --data "{\"text\":\"✅ Extrudex dev deployed successfully from dev branch.\"}" \
+            "${{ secrets.SLACK_WEBHOOK_URL }}"
+
+  notify-failure:
+    needs: [build-test, deploy-dev]
+    if: failure()
+    runs-on: ubuntu-latest
+    steps:
+      - name: Notify Slack failure
+        run: |
+          curl -X POST -H 'Content-type: application/json' \
+            --data "{\"text\":\"🚨 Extrudex dev pipeline failed. Check Gitea Actions for details.\"}" \
+            "${{ secrets.SLACK_WEBHOOK_URL }}"

.gitignore

@@ -4,8 +4,7 @@ obj/
 *.suo
 .vs/
 
-# Frontend (Angular)
-frontend/node_modules/
+# Frontend build artifacts
 frontend/dist/
+frontend/node_modules/
 frontend/.angular/
-frontend/*.log

backend/.dockerignore

@@ -0,0 +1,27 @@
+# Build artifacts
+bin/
+obj/
+
+# IDE / editor
+.vs/
+.vscode/
+*.user
+*.suo
+.idea/
+
+# Environment & secrets
+appsettings.Development.json
+.env
+.env.*
+
+# Docker
+Dockerfile
+.dockerignore
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Misc
+*.md
+*.log

backend/API/Controllers/UsageLogsController.cs

@@ -0,0 +1,117 @@
+using Extrudex.API.DTOs.UsageLogs;
+using Extrudex.Domain.Enums;
+using Extrudex.Domain.Interfaces;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Extrudex.API.Controllers;
+
+/// <summary>
+/// API controller for recording and querying filament usage logs.
+/// Usage logs provide a fine-grained audit trail of filament consumption
+/// from printer integrations or manual input.
+/// </summary>
+[ApiController]
+[Route("api/[controller]")]
+[Produces("application/json")]
+public class UsageLogsController : ControllerBase
+{
+    private readonly IUsageLogService _usageLogService;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="UsageLogsController"/> class.
+    /// </summary>
+    /// <param name="usageLogService">The usage log service for recording and querying usage.</param>
+    public UsageLogsController(IUsageLogService usageLogService)
+    {
+        _usageLogService = usageLogService;
+    }
+
+    /// <summary>
+    /// Records a new filament usage entry.
+    /// </summary>
+    /// <param name="request">The usage entry details.</param>
+    /// <returns>The created usage log entry.</returns>
+    [HttpPost]
+    [ProducesResponseType(typeof(UsageLogResponse), StatusCodes.Status201Created)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    public async Task<ActionResult<UsageLogResponse>> Create([FromBody] CreateUsageLogRequest request)
+    {
+        if (!Enum.TryParse<DataSource>(request.DataSource, ignoreCase: true, out var dataSource))
+        {
+            return BadRequest($"Invalid data source: '{request.DataSource}'. Valid values: Mqtt, Moonraker, Manual.");
+        }
+
+        var entry = await _usageLogService.RecordUsageAsync(
+            spoolId: request.SpoolId,
+            gramsUsed: request.GramsUsed,
+            dataSource: dataSource,
+            printerId: request.PrinterId,
+            printJobId: request.PrintJobId,
+            mmExtruded: request.MmExtruded,
+            usageTimestamp: request.UsageTimestamp,
+            notes: request.Notes
+        );
+
+        return CreatedAtAction(
+            nameof(GetBySpool),
+            new { spoolId = entry.SpoolId },
+            MapToResponse(entry));
+    }
+
+    /// <summary>
+    /// Gets usage logs for a specific spool, ordered by most recent first.
+    /// </summary>
+    /// <param name="spoolId">The spool ID to filter by.</param>
+    /// <returns>A collection of usage log entries for the spool.</returns>
+    [HttpGet("spool/{spoolId:guid}")]
+    [ProducesResponseType(typeof(IEnumerable<UsageLogResponse>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<IEnumerable<UsageLogResponse>>> GetBySpool(Guid spoolId)
+    {
+        var logs = await _usageLogService.GetBySpoolAsync(spoolId);
+        return Ok(logs.Select(MapToResponse));
+    }
+
+    /// <summary>
+    /// Gets usage logs for a specific printer, ordered by most recent first.
+    /// </summary>
+    /// <param name="printerId">The printer ID to filter by.</param>
+    /// <returns>A collection of usage log entries for the printer.</returns>
+    [HttpGet("printer/{printerId:guid}")]
+    [ProducesResponseType(typeof(IEnumerable<UsageLogResponse>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<IEnumerable<UsageLogResponse>>> GetByPrinter(Guid printerId)
+    {
+        var logs = await _usageLogService.GetByPrinterAsync(printerId);
+        return Ok(logs.Select(MapToResponse));
+    }
+
+    /// <summary>
+    /// Gets usage logs for a specific print job, ordered by most recent first.
+    /// </summary>
+    /// <param name="printJobId">The print job ID to filter by.</param>
+    /// <returns>A collection of usage log entries for the print job.</returns>
+    [HttpGet("print-job/{printJobId:guid}")]
+    [ProducesResponseType(typeof(IEnumerable<UsageLogResponse>), StatusCodes.Status200OK)]
+    public async Task<ActionResult<IEnumerable<UsageLogResponse>>> GetByPrintJob(Guid printJobId)
+    {
+        var logs = await _usageLogService.GetByPrintJobAsync(printJobId);
+        return Ok(logs.Select(MapToResponse));
+    }
+
+    /// <summary>
+    /// Maps a UsageLog domain entity to a UsageLogResponse DTO.
+    /// </summary>
+    private static UsageLogResponse MapToResponse(Domain.Entities.UsageLog log) => new()
+    {
+        Id = log.Id,
+        SpoolId = log.SpoolId,
+        PrinterId = log.PrinterId,
+        PrintJobId = log.PrintJobId,
+        GramsUsed = log.GramsUsed,
+        MmExtruded = log.MmExtruded,
+        UsageTimestamp = log.UsageTimestamp,
+        DataSource = log.DataSource.ToString(),
+        Notes = log.Notes,
+        CreatedAt = log.CreatedAt,
+        UpdatedAt = log.UpdatedAt
+    };
+}

backend/API/DTOs/UsageLogs/UsageLogDtos.cs

@@ -0,0 +1,115 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Extrudex.API.DTOs.UsageLogs;
+
+/// <summary>
+/// Request DTO for recording a filament usage entry.
+/// </summary>
+public class CreateUsageLogRequest
+{
+    /// <summary>
+    /// The ID of the spool that provided the filament.
+    /// </summary>
+    [Required]
+    public Guid SpoolId { get; set; }
+
+    /// <summary>
+    /// The number of grams of filament consumed.
+    /// </summary>
+    [Required]
+    [Range(0.01, double.MaxValue, ErrorMessage = "GramsUsed must be a positive value.")]
+    public decimal GramsUsed { get; set; }
+
+    /// <summary>
+    /// The source of the usage data (Mqtt, Moonraker, Manual).
+    /// </summary>
+    [Required]
+    public string DataSource { get; set; } = string.Empty;
+
+    /// <summary>
+    /// The ID of the printer that consumed the filament. Optional.
+    /// </summary>
+    public Guid? PrinterId { get; set; }
+
+    /// <summary>
+    /// The ID of the print job associated with this usage. Optional.
+    /// </summary>
+    public Guid? PrintJobId { get; set; }
+
+    /// <summary>
+    /// The number of millimeters of filament extruded. Optional.
+    /// </summary>
+    public decimal? MmExtruded { get; set; }
+
+    /// <summary>
+    /// When the usage occurred (UTC). Defaults to now if not specified.
+    /// </summary>
+    public DateTime? UsageTimestamp { get; set; }
+
+    /// <summary>
+    /// Optional notes about this usage entry.
+    /// </summary>
+    [MaxLength(2000)]
+    public string? Notes { get; set; }
+}
+
+/// <summary>
+/// Response DTO for a usage log entry.
+/// </summary>
+public class UsageLogResponse
+{
+    /// <summary>
+    /// Unique identifier for the usage log entry.
+    /// </summary>
+    public Guid Id { get; set; }
+
+    /// <summary>
+    /// The spool that provided the filament.
+    /// </summary>
+    public Guid SpoolId { get; set; }
+
+    /// <summary>
+    /// The printer that consumed the filament, if applicable.
+    /// </summary>
+    public Guid? PrinterId { get; set; }
+
+    /// <summary>
+    /// The print job associated with this usage, if applicable.
+    /// </summary>
+    public Guid? PrintJobId { get; set; }
+
+    /// <summary>
+    /// Grams of filament consumed.
+    /// </summary>
+    public decimal GramsUsed { get; set; }
+
+    /// <summary>
+    /// Millimeters of filament extruded, if available.
+    /// </summary>
+    public decimal? MmExtruded { get; set; }
+
+    /// <summary>
+    /// When the usage occurred (UTC).
+    /// </summary>
+    public DateTime UsageTimestamp { get; set; }
+
+    /// <summary>
+    /// Source of the usage data (Mqtt, Moonraker, Manual).
+    /// </summary>
+    public string DataSource { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Optional notes about this usage entry.
+    /// </summary>
+    public string? Notes { get; set; }
+
+    /// <summary>
+    /// When the record was created (UTC).
+    /// </summary>
+    public DateTime CreatedAt { get; set; }
+
+    /// <summary>
+    /// When the record was last updated (UTC).
+    /// </summary>
+    public DateTime UpdatedAt { get; set; }
+}

backend/Dockerfile

@@ -0,0 +1,34 @@
+# ── Stage 1: Build ──────────────────────────────────────────
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
+WORKDIR /src
+
+# Copy csproj first for layer caching — restores before copying source
+COPY Extrudex.csproj .
+RUN dotnet restore
+
+# Copy the rest of the source
+COPY . .
+RUN dotnet publish Extrudex.csproj \
+    -c Release \
+    -o /app/publish \
+    --no-restore
+
+# ── Stage 2: Runtime ────────────────────────────────────────
+FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS runtime
+WORKDIR /app
+
+# Non-root user for security
+RUN adduser --disabled-password --gecos "" appuser
+USER appuser
+
+# Copy published output from build stage
+COPY --from=build /app/publish .
+
+# ASP.NET Core listens on 8080 by default in .NET 8+
+EXPOSE 8080
+
+# Health check against /health endpoint
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+    CMD curl --fail http://localhost:8080/health || exit 1
+
+ENTRYPOINT ["dotnet", "Extrudex.dll"]

backend/Domain/Entities/UsageLog.cs

@@ -0,0 +1,72 @@
+using Extrudex.Domain.Base;
+using Extrudex.Domain.Enums;
+
+namespace Extrudex.Domain.Entities;
+
+/// <summary>
+/// Represents a single filament usage log entry. Records how much filament
+/// was consumed, by which printer, at what time, and optionally linked to
+/// a print job. This provides a fine-grained audit trail of filament consumption
+/// independent of print job lifecycle.
+/// </summary>
+public class UsageLog : AuditableEntity
+{
+    /// <summary>
+    /// Foreign key to the spool that provided the filament.
+    /// </summary>
+    public Guid SpoolId { get; set; }
+
+    /// <summary>
+    /// Navigation to the spool that provided the filament.
+    /// </summary>
+    public Spool Spool { get; set; } = null!;
+
+    /// <summary>
+    /// Foreign key to the printer that consumed the filament.
+    /// Nullable to support manual entries without a specific printer.
+    /// </summary>
+    public Guid? PrinterId { get; set; }
+
+    /// <summary>
+    /// Navigation to the printer that consumed the filament.
+    /// </summary>
+    public Printer? Printer { get; set; }
+
+    /// <summary>
+    /// Foreign key to the print job associated with this usage entry.
+    /// Nullable because usage can be logged before or without a print job.
+    /// </summary>
+    public Guid? PrintJobId { get; set; }
+
+    /// <summary>
+    /// Navigation to the print job associated with this usage entry.
+    /// </summary>
+    public PrintJob? PrintJob { get; set; }
+
+    /// <summary>
+    /// The number of grams of filament consumed in this usage event.
+    /// </summary>
+    public decimal GramsUsed { get; set; }
+
+    /// <summary>
+    /// The number of millimeters of filament extruded in this usage event.
+    /// Optional — may not be available for all data sources.
+    /// </summary>
+    public decimal? MmExtruded { get; set; }
+
+    /// <summary>
+    /// Timestamp when the usage occurred (UTC). This is the actual time of
+    /// consumption, which may differ from CreatedAt if the entry was recorded later.
+    /// </summary>
+    public DateTime UsageTimestamp { get; set; } = DateTime.UtcNow;
+
+    /// <summary>
+    /// The source of the usage data (which integration path provided it).
+    /// </summary>
+    public DataSource DataSource { get; set; } = DataSource.Manual;
+
+    /// <summary>
+    /// Optional notes about this usage entry.
+    /// </summary>
+    public string? Notes { get; set; }
+}

backend/Domain/Interfaces/IUsageLogService.cs

@@ -0,0 +1,57 @@
+using Extrudex.Domain.Entities;
+using Extrudex.Domain.Enums;
+
+namespace Extrudex.Domain.Interfaces;
+
+/// <summary>
+/// Service for recording filament usage entries. Writes to the usage_logs table
+/// and provides query capabilities for usage history.
+/// </summary>
+public interface IUsageLogService
+{
+    /// <summary>
+    /// Records a filament usage entry.
+    /// </summary>
+    /// <param name="spoolId">The spool that provided the filament.</param>
+    /// <param name="gramsUsed">Grams of filament consumed.</param>
+    /// <param name="dataSource">Where the data came from.</param>
+    /// <param name="printerId">Optional printer ID.</param>
+    /// <param name="printJobId">Optional print job ID.</param>
+    /// <param name="mmExtruded">Optional mm extruded.</param>
+    /// <param name="usageTimestamp">When the usage occurred (defaults to UTC now).</param>
+    /// <param name="notes">Optional notes.</param>
+    /// <returns>The created UsageLog entity.</returns>
+    Task<UsageLog> RecordUsageAsync(
+        Guid spoolId,
+        decimal gramsUsed,
+        DataSource dataSource,
+        Guid? printerId = null,
+        Guid? printJobId = null,
+        decimal? mmExtruded = null,
+        DateTime? usageTimestamp = null,
+        string? notes = null);
+
+    /// <summary>
+    /// Retrieves usage logs for a specific spool, ordered by usage timestamp descending.
+    /// </summary>
+    /// <param name="spoolId">The spool ID to filter by.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A collection of usage logs for the spool.</returns>
+    Task<IEnumerable<UsageLog>> GetBySpoolAsync(Guid spoolId, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Retrieves usage logs for a specific printer, ordered by usage timestamp descending.
+    /// </summary>
+    /// <param name="printerId">The printer ID to filter by.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A collection of usage logs for the printer.</returns>
+    Task<IEnumerable<UsageLog>> GetByPrinterAsync(Guid printerId, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Retrieves usage logs for a specific print job, ordered by usage timestamp descending.
+    /// </summary>
+    /// <param name="printJobId">The print job ID to filter by.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A collection of usage logs for the print job.</returns>
+    Task<IEnumerable<UsageLog>> GetByPrintJobAsync(Guid printJobId, CancellationToken cancellationToken = default);
+}

backend/Extrudex.csproj

@@ -9,6 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="AspNetCore.HealthChecks.NpgSql" Version="9.0.0" />
     <PackageReference Include="FluentValidation.DependencyInjectionExtensions" Version="12.1.1" />
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.3" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="9.0.3" />

backend/Infrastructure/Data/Configurations/BaseEntityConfiguration.cs

@@ -49,15 +49,26 @@ public abstract class BaseEntityConfiguration<TEntity> : IEntityTypeConfiguratio
     }
 
     /// <summary>
-    /// Converts PascalCase or camelCase to snake_case.
+    /// Converts PascalCase or camelCase entity name to plural snake_case table name.
+    /// e.g. MaterialBase → material_bases, AmsSlot → ams_slots
     /// </summary>
     protected static string ToSnakeCase(string name)
     {
-        return string.Concat(
+        var snake = string.Concat(
                 name.Select((ch, i) =>
                     i > 0 && char.IsUpper(ch) && (char.IsLower(name[i - 1]) || (i + 1 < name.Length && char.IsLower(name[i + 1])))
                         ? "_" + ch
                         : ch.ToString()))
             .ToLowerInvariant();
+
+        // Pluralize: add 's' (handles most cases; irregular plurals handled explicitly if needed)
+        // Special cases: already_plural stays, 'y' → 'ies', 's'/'x'/'ch'/'sh' → 'es'
+        if (snake.EndsWith("s"))
+            return snake; // Already plural or ambiguous — leave as-is
+        if (snake.EndsWith("y") && !snake.EndsWith("ay") && !snake.EndsWith("ey") && !snake.EndsWith("oy") && !snake.EndsWith("uy"))
+            return snake[..^1] + "ies";
+        if (snake.EndsWith("x") || snake.EndsWith("ch") || snake.EndsWith("sh"))
+            return snake + "es";
+        return snake + "s";
     }
 }

backend/Infrastructure/Data/Configurations/SpoolConfiguration.cs

@@ -77,6 +77,14 @@ public class SpoolConfiguration : BaseEntityConfiguration<Spool>
         builder.HasIndex(e => e.MaterialBaseId)
             .HasDatabaseName("ix_spools_material_base_id");
 
+        // Index on material_finish_id for spool filtering
+        builder.HasIndex(e => e.MaterialFinishId)
+            .HasDatabaseName("ix_spools_material_finish_id");
+
+        // Index on material_modifier_id for spool filtering
+        builder.HasIndex(e => e.MaterialModifierId)
+            .HasDatabaseName("ix_spools_material_modifier_id");
+
         // Index on is_active for active spool queries
         builder.HasIndex(e => e.IsActive)
             .HasDatabaseName("ix_spools_is_active");

backend/Infrastructure/Data/Configurations/UsageLogConfiguration.cs

@@ -0,0 +1,91 @@
+using Extrudex.Domain.Entities;
+using Extrudex.Domain.Enums;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace Extrudex.Infrastructure.Data.Configurations;
+
+/// <summary>
+/// EF Core configuration for the UsageLog entity.
+/// Maps to the usage_logs table with snake_case columns and appropriate indexes.
+/// </summary>
+public class UsageLogConfiguration : BaseEntityConfiguration<UsageLog>
+{
+    /// <inheritdoc/>
+    public override void Configure(EntityTypeBuilder<UsageLog> builder)
+    {
+        base.Configure(builder);
+
+        builder.Property(e => e.SpoolId)
+            .HasColumnName("spool_id")
+            .IsRequired();
+
+        builder.Property(e => e.PrinterId)
+            .HasColumnName("printer_id");
+
+        builder.Property(e => e.PrintJobId)
+            .HasColumnName("print_job_id");
+
+        builder.Property(e => e.GramsUsed)
+            .HasColumnName("grams_used")
+            .HasPrecision(10, 2)
+            .IsRequired();
+
+        builder.Property(e => e.MmExtruded)
+            .HasColumnName("mm_extruded")
+            .HasPrecision(12, 2);
+
+        builder.Property(e => e.UsageTimestamp)
+            .HasColumnName("usage_timestamp")
+            .IsRequired();
+
+        builder.Property(e => e.DataSource)
+            .HasColumnName("data_source")
+            .HasConversion<string>()
+            .HasMaxLength(50)
+            .IsRequired();
+
+        builder.Property(e => e.Notes)
+            .HasColumnName("notes")
+            .HasMaxLength(2000);
+
+        // Index on spool_id for querying usage by spool
+        builder.HasIndex(e => e.SpoolId)
+            .HasDatabaseName("ix_usage_logs_spool_id");
+
+        // Index on printer_id for querying usage by printer
+        builder.HasIndex(e => e.PrinterId)
+            .HasDatabaseName("ix_usage_logs_printer_id");
+
+        // Index on print_job_id for querying usage by print job
+        builder.HasIndex(e => e.PrintJobId)
+            .HasDatabaseName("ix_usage_logs_print_job_id");
+
+        // Index on usage_timestamp for chronological queries
+        builder.HasIndex(e => e.UsageTimestamp)
+            .HasDatabaseName("ix_usage_logs_usage_timestamp");
+
+        // Index on data_source for filtering by integration path
+        builder.HasIndex(e => e.DataSource)
+            .HasDatabaseName("ix_usage_logs_data_source");
+
+        // Relationships
+        builder.HasOne(e => e.Spool)
+            .WithMany()
+            .HasForeignKey(e => e.SpoolId)
+            .HasConstraintName("fk_usage_logs_spool")
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasOne(e => e.Printer)
+            .WithMany()
+            .HasForeignKey(e => e.PrinterId)
+            .HasConstraintName("fk_usage_logs_printer")
+            .OnDelete(DeleteBehavior.SetNull);
+
+        builder.HasOne(e => e.PrintJob)
+            .WithMany()
+            .HasForeignKey(e => e.PrintJobId)
+            .HasConstraintName("fk_usage_logs_print_job")
+            .OnDelete(DeleteBehavior.SetNull);
+    }
+}

backend/Infrastructure/Data/ExtrudexDbContext.cs

@@ -23,6 +23,7 @@ public class ExtrudexDbContext : DbContext
     public DbSet<AmsUnit> AmsUnits => Set<AmsUnit>();
     public DbSet<AmsSlot> AmsSlots => Set<AmsSlot>();
     public DbSet<PrintJob> PrintJobs => Set<PrintJob>();
+    public DbSet<UsageLog> UsageLogs => Set<UsageLog>();
 
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {

backend/Infrastructure/Data/Migrations/20260426131419_InitialCreate.Designer.cs

@@ -0,0 +1,958 @@
+// <auto-generated />
+using System;
+using Extrudex.Infrastructure.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 Extrudex.Infrastructure.Data.Migrations
+{
+    [DbContext(typeof(ExtrudexDbContext))]
+    [Migration("20260426131419_InitialCreate")]
+    partial class InitialCreate
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "9.0.3")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.AmsSlot", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<Guid>("AmsUnitId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("ams_unit_id");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.Property<decimal?>("RemainingWeightG")
+                        .HasPrecision(10, 2)
+                        .HasColumnType("numeric(10,2)")
+                        .HasColumnName("remaining_weight_g");
+
+                    b.Property<Guid?>("SpoolId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("spool_id");
+
+                    b.Property<int>("TrayIndex")
+                        .HasColumnType("integer")
+                        .HasColumnName("tray_index");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("SpoolId")
+                        .HasDatabaseName("ix_ams_slots_spool_id");
+
+                    b.HasIndex("AmsUnitId", "TrayIndex")
+                        .IsUnique()
+                        .HasDatabaseName("ix_ams_slots_ams_unit_id_tray_index");
+
+                    b.ToTable("ams_slots", (string)null);
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.AmsUnit", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.Property<Guid>("PrinterId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("printer_id");
+
+                    b.Property<int>("UnitIndex")
+                        .HasColumnType("integer")
+                        .HasColumnName("unit_index");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("PrinterId", "UnitIndex")
+                        .IsUnique()
+                        .HasDatabaseName("ix_ams_units_printer_id_unit_index");
+
+                    b.ToTable("ams_units", (string)null);
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.MaterialBase", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.Property<decimal>("DensityGperCm3")
+                        .HasPrecision(10, 4)
+                        .HasColumnType("numeric(10,4)")
+                        .HasColumnName("density_g_per_cm3");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("name");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Name")
+                        .IsUnique()
+                        .HasDatabaseName("ix_material_bases_name");
+
+                    b.ToTable("material_bases", (string)null);
+
+                    b.HasData(
+                        new
+                        {
+                            Id = new Guid("10000000-0000-0000-0000-000000000001"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1096),
+                            DensityGperCm3 = 1.24m,
+                            Name = "PLA",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1096)
+                        },
+                        new
+                        {
+                            Id = new Guid("10000000-0000-0000-0000-000000000002"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1620),
+                            DensityGperCm3 = 1.27m,
+                            Name = "PETG",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1620)
+                        },
+                        new
+                        {
+                            Id = new Guid("10000000-0000-0000-0000-000000000003"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1630),
+                            DensityGperCm3 = 1.04m,
+                            Name = "ABS",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1630)
+                        },
+                        new
+                        {
+                            Id = new Guid("10000000-0000-0000-0000-000000000004"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1638),
+                            DensityGperCm3 = 1.07m,
+                            Name = "ASA",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1638)
+                        },
+                        new
+                        {
+                            Id = new Guid("10000000-0000-0000-0000-000000000005"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1645),
+                            DensityGperCm3 = 1.21m,
+                            Name = "TPU",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1645)
+                        },
+                        new
+                        {
+                            Id = new Guid("10000000-0000-0000-0000-000000000006"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1651),
+                            DensityGperCm3 = 1.14m,
+                            Name = "Nylon",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1652)
+                        });
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.MaterialFinish", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.Property<Guid>("MaterialBaseId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("material_base_id");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("name");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MaterialBaseId", "Name")
+                        .IsUnique()
+                        .HasDatabaseName("ix_material_finishes_material_base_id_name");
+
+                    b.ToTable("material_finishes", (string)null);
+
+                    b.HasData(
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000001"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1850),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000001"),
+                            Name = "Basic",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1850)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000002"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2041),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000001"),
+                            Name = "Matte",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2041)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000003"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2049),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000001"),
+                            Name = "Silk",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2049)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000004"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2055),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000001"),
+                            Name = "Glitter",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2056)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000005"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2062),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000001"),
+                            Name = "Marble",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2062)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000006"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2068),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000001"),
+                            Name = "Sparkle",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2068)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000007"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2075),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000002"),
+                            Name = "Basic",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2075)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000008"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2081),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000002"),
+                            Name = "Matte",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2081)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000009"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2100),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000002"),
+                            Name = "Silk",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2100)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000010"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2107),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000003"),
+                            Name = "Basic",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2107)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000011"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2113),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000003"),
+                            Name = "Matte",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2113)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000012"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2120),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000004"),
+                            Name = "Basic",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2120)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000013"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2126),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000004"),
+                            Name = "Matte",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2126)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000014"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2132),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000005"),
+                            Name = "Basic",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2133)
+                        },
+                        new
+                        {
+                            Id = new Guid("20000000-0000-0000-0000-000000000015"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2139),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000006"),
+                            Name = "Basic",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2139)
+                        });
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.MaterialModifier", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.Property<Guid>("MaterialBaseId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("material_base_id");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)")
+                        .HasColumnName("name");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MaterialBaseId", "Name")
+                        .IsUnique()
+                        .HasDatabaseName("ix_material_modifiers_material_base_id_name");
+
+                    b.ToTable("material_modifiers", (string)null);
+
+                    b.HasData(
+                        new
+                        {
+                            Id = new Guid("30000000-0000-0000-0000-000000000001"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2304),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000001"),
+                            Name = "Carbon Fiber",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2304)
+                        },
+                        new
+                        {
+                            Id = new Guid("30000000-0000-0000-0000-000000000002"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2463),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000001"),
+                            Name = "Glass Fiber",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2463)
+                        },
+                        new
+                        {
+                            Id = new Guid("30000000-0000-0000-0000-000000000003"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2471),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000001"),
+                            Name = "Wood Fill",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2471)
+                        },
+                        new
+                        {
+                            Id = new Guid("30000000-0000-0000-0000-000000000004"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2477),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000001"),
+                            Name = "Glow-in-the-Dark",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2478)
+                        },
+                        new
+                        {
+                            Id = new Guid("30000000-0000-0000-0000-000000000005"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2484),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000002"),
+                            Name = "Carbon Fiber",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2484)
+                        },
+                        new
+                        {
+                            Id = new Guid("30000000-0000-0000-0000-000000000006"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2490),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000002"),
+                            Name = "Glass Fiber",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2491)
+                        },
+                        new
+                        {
+                            Id = new Guid("30000000-0000-0000-0000-000000000007"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2497),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000003"),
+                            Name = "Carbon Fiber",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2497)
+                        },
+                        new
+                        {
+                            Id = new Guid("30000000-0000-0000-0000-000000000008"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2503),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000003"),
+                            Name = "Glass Fiber",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2503)
+                        },
+                        new
+                        {
+                            Id = new Guid("30000000-0000-0000-0000-000000000009"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2510),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000004"),
+                            Name = "Carbon Fiber",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2510)
+                        },
+                        new
+                        {
+                            Id = new Guid("30000000-0000-0000-0000-000000000010"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2516),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000006"),
+                            Name = "Carbon Fiber",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2516)
+                        },
+                        new
+                        {
+                            Id = new Guid("30000000-0000-0000-0000-000000000011"),
+                            CreatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2522),
+                            MaterialBaseId = new Guid("10000000-0000-0000-0000-000000000006"),
+                            Name = "Glass Fiber",
+                            UpdatedAt = new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2523)
+                        });
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.PrintJob", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<DateTime?>("CompletedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("completed_at");
+
+                    b.Property<decimal?>("CostPerPrint")
+                        .HasPrecision(10, 4)
+                        .HasColumnType("numeric(10,4)")
+                        .HasColumnName("cost_per_print");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.Property<string>("DataSource")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasColumnName("data_source");
+
+                    b.Property<decimal>("FilamentDiameterAtPrintMm")
+                        .HasPrecision(6, 3)
+                        .HasColumnType("numeric(6,3)")
+                        .HasColumnName("filament_diameter_at_print_mm");
+
+                    b.Property<string>("GcodeFilePath")
+                        .HasMaxLength(1000)
+                        .HasColumnType("character varying(1000)")
+                        .HasColumnName("gcode_file_path");
+
+                    b.Property<decimal>("GramsDerived")
+                        .HasPrecision(10, 2)
+                        .HasColumnType("numeric(10,2)")
+                        .HasColumnName("grams_derived");
+
+                    b.Property<decimal>("MaterialDensityAtPrint")
+                        .HasPrecision(10, 4)
+                        .HasColumnType("numeric(10,4)")
+                        .HasColumnName("material_density_at_print");
+
+                    b.Property<decimal>("MmExtruded")
+                        .HasPrecision(12, 2)
+                        .HasColumnType("numeric(12,2)")
+                        .HasColumnName("mm_extruded");
+
+                    b.Property<string>("Notes")
+                        .HasMaxLength(2000)
+                        .HasColumnType("character varying(2000)")
+                        .HasColumnName("notes");
+
+                    b.Property<string>("PrintName")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("print_name");
+
+                    b.Property<Guid>("PrinterId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("printer_id");
+
+                    b.Property<Guid>("SpoolId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("spool_id");
+
+                    b.Property<DateTime?>("StartedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("started_at");
+
+                    b.Property<string>("Status")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasDefaultValue("Queued")
+                        .HasColumnName("status");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("DataSource")
+                        .HasDatabaseName("ix_print_jobs_data_source");
+
+                    b.HasIndex("PrinterId")
+                        .HasDatabaseName("ix_print_jobs_printer_id");
+
+                    b.HasIndex("SpoolId")
+                        .HasDatabaseName("ix_print_jobs_spool_id");
+
+                    b.HasIndex("Status")
+                        .HasDatabaseName("ix_print_jobs_status");
+
+                    b.ToTable("print_jobs", (string)null);
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.Printer", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<string>("ApiKey")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("api_key");
+
+                    b.Property<string>("ConnectionType")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasColumnName("connection_type");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.Property<string>("HostnameOrIp")
+                        .IsRequired()
+                        .HasMaxLength(255)
+                        .HasColumnType("character varying(255)")
+                        .HasColumnName("hostname_or_ip");
+
+                    b.Property<bool>("IsActive")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(true)
+                        .HasColumnName("is_active");
+
+                    b.Property<DateTime?>("LastSeenAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("last_seen_at");
+
+                    b.Property<string>("Manufacturer")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("manufacturer");
+
+                    b.Property<string>("Model")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("model");
+
+                    b.Property<string>("MqttPassword")
+                        .IsRequired()
+                        .HasMaxLength(500)
+                        .HasColumnType("character varying(500)")
+                        .HasColumnName("mqtt_password");
+
+                    b.Property<bool>("MqttUseTls")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(false)
+                        .HasColumnName("mqtt_use_tls");
+
+                    b.Property<string>("MqttUsername")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("mqtt_username");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("name");
+
+                    b.Property<int>("Port")
+                        .HasColumnType("integer")
+                        .HasColumnName("port");
+
+                    b.Property<string>("PrinterType")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasColumnName("printer_type");
+
+                    b.Property<string>("Status")
+                        .IsRequired()
+                        .ValueGeneratedOnAdd()
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)")
+                        .HasDefaultValue("Offline")
+                        .HasColumnName("status");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ConnectionType")
+                        .HasDatabaseName("ix_printers_connection_type");
+
+                    b.HasIndex("IsActive")
+                        .HasDatabaseName("ix_printers_is_active");
+
+                    b.HasIndex("PrinterType")
+                        .HasDatabaseName("ix_printers_printer_type");
+
+                    b.HasIndex("Status")
+                        .HasDatabaseName("ix_printers_status");
+
+                    b.ToTable("printers", (string)null);
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.Spool", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<string>("Brand")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("brand");
+
+                    b.Property<string>("ColorHex")
+                        .IsRequired()
+                        .HasMaxLength(7)
+                        .HasColumnType("character varying(7)")
+                        .HasColumnName("color_hex");
+
+                    b.Property<string>("ColorName")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("color_name");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.Property<decimal>("FilamentDiameterMm")
+                        .HasPrecision(6, 3)
+                        .HasColumnType("numeric(6,3)")
+                        .HasColumnName("filament_diameter_mm");
+
+                    b.Property<bool>("IsActive")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("boolean")
+                        .HasDefaultValue(true)
+                        .HasColumnName("is_active");
+
+                    b.Property<Guid>("MaterialBaseId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("material_base_id");
+
+                    b.Property<Guid>("MaterialFinishId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("material_finish_id");
+
+                    b.Property<Guid?>("MaterialModifierId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("material_modifier_id");
+
+                    b.Property<DateTime?>("PurchaseDate")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("purchase_date");
+
+                    b.Property<decimal?>("PurchasePrice")
+                        .HasPrecision(10, 2)
+                        .HasColumnType("numeric(10,2)")
+                        .HasColumnName("purchase_price");
+
+                    b.Property<string>("SpoolSerial")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)")
+                        .HasColumnName("spool_serial");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at")
+                        .HasDefaultValueSql("now() at time zone 'utc'");
+
+                    b.Property<decimal>("WeightRemainingGrams")
+                        .HasPrecision(10, 2)
+                        .HasColumnType("numeric(10,2)")
+                        .HasColumnName("weight_remaining_grams");
+
+                    b.Property<decimal>("WeightTotalGrams")
+                        .HasPrecision(10, 2)
+                        .HasColumnType("numeric(10,2)")
+                        .HasColumnName("weight_total_grams");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("IsActive")
+                        .HasDatabaseName("ix_spools_is_active");
+
+                    b.HasIndex("MaterialBaseId")
+                        .HasDatabaseName("ix_spools_material_base_id");
+
+                    b.HasIndex("MaterialFinishId")
+                        .HasDatabaseName("ix_spools_material_finish_id");
+
+                    b.HasIndex("MaterialModifierId")
+                        .HasDatabaseName("ix_spools_material_modifier_id");
+
+                    b.HasIndex("SpoolSerial")
+                        .IsUnique()
+                        .HasDatabaseName("ix_spools_spool_serial");
+
+                    b.ToTable("spools", (string)null);
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.AmsSlot", b =>
+                {
+                    b.HasOne("Extrudex.Domain.Entities.AmsUnit", "AmsUnit")
+                        .WithMany("Slots")
+                        .HasForeignKey("AmsUnitId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_ams_slots_ams_unit");
+
+                    b.HasOne("Extrudex.Domain.Entities.Spool", "Spool")
+                        .WithMany("AmsSlots")
+                        .HasForeignKey("SpoolId")
+                        .OnDelete(DeleteBehavior.SetNull)
+                        .HasConstraintName("fk_ams_slots_spool");
+
+                    b.Navigation("AmsUnit");
+
+                    b.Navigation("Spool");
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.AmsUnit", b =>
+                {
+                    b.HasOne("Extrudex.Domain.Entities.Printer", "Printer")
+                        .WithMany("AmsUnits")
+                        .HasForeignKey("PrinterId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_ams_units_printer");
+
+                    b.Navigation("Printer");
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.MaterialFinish", b =>
+                {
+                    b.HasOne("Extrudex.Domain.Entities.MaterialBase", "MaterialBase")
+                        .WithMany("Finishes")
+                        .HasForeignKey("MaterialBaseId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired()
+                        .HasConstraintName("fk_material_finishes_material_base");
+
+                    b.Navigation("MaterialBase");
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.MaterialModifier", b =>
+                {
+                    b.HasOne("Extrudex.Domain.Entities.MaterialBase", "MaterialBase")
+                        .WithMany("Modifiers")
+                        .HasForeignKey("MaterialBaseId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired()
+                        .HasConstraintName("fk_material_modifiers_material_base");
+
+                    b.Navigation("MaterialBase");
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.PrintJob", b =>
+                {
+                    b.HasOne("Extrudex.Domain.Entities.Printer", "Printer")
+                        .WithMany("PrintJobs")
+                        .HasForeignKey("PrinterId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired()
+                        .HasConstraintName("fk_print_jobs_printer");
+
+                    b.HasOne("Extrudex.Domain.Entities.Spool", "Spool")
+                        .WithMany("PrintJobs")
+                        .HasForeignKey("SpoolId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired()
+                        .HasConstraintName("fk_print_jobs_spool");
+
+                    b.Navigation("Printer");
+
+                    b.Navigation("Spool");
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.Spool", b =>
+                {
+                    b.HasOne("Extrudex.Domain.Entities.MaterialBase", "MaterialBase")
+                        .WithMany("Spools")
+                        .HasForeignKey("MaterialBaseId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired()
+                        .HasConstraintName("fk_spools_material_base");
+
+                    b.HasOne("Extrudex.Domain.Entities.MaterialFinish", "MaterialFinish")
+                        .WithMany("Spools")
+                        .HasForeignKey("MaterialFinishId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired()
+                        .HasConstraintName("fk_spools_material_finish");
+
+                    b.HasOne("Extrudex.Domain.Entities.MaterialModifier", "MaterialModifier")
+                        .WithMany("Spools")
+                        .HasForeignKey("MaterialModifierId")
+                        .OnDelete(DeleteBehavior.SetNull)
+                        .HasConstraintName("fk_spools_material_modifier");
+
+                    b.Navigation("MaterialBase");
+
+                    b.Navigation("MaterialFinish");
+
+                    b.Navigation("MaterialModifier");
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.AmsUnit", b =>
+                {
+                    b.Navigation("Slots");
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.MaterialBase", b =>
+                {
+                    b.Navigation("Finishes");
+
+                    b.Navigation("Modifiers");
+
+                    b.Navigation("Spools");
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.MaterialFinish", b =>
+                {
+                    b.Navigation("Spools");
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.MaterialModifier", b =>
+                {
+                    b.Navigation("Spools");
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.Printer", b =>
+                {
+                    b.Navigation("AmsUnits");
+
+                    b.Navigation("PrintJobs");
+                });
+
+            modelBuilder.Entity("Extrudex.Domain.Entities.Spool", b =>
+                {
+                    b.Navigation("AmsSlots");
+
+                    b.Navigation("PrintJobs");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

backend/Infrastructure/Data/Migrations/20260426131419_InitialCreate.cs

@@ -0,0 +1,416 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+#pragma warning disable CA1814 // Prefer jagged arrays over multidimensional
+
+namespace Extrudex.Infrastructure.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class InitialCreate : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "material_bases",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    name = table.Column<string>(type: "character varying(100)", maxLength: 100, nullable: false),
+                    density_g_per_cm3 = table.Column<decimal>(type: "numeric(10,4)", precision: 10, scale: 4, nullable: false),
+                    created_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'"),
+                    updated_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_material_bases", x => x.id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "printers",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    status = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false, defaultValue: "Offline"),
+                    name = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
+                    manufacturer = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
+                    model = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
+                    printer_type = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false),
+                    connection_type = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false),
+                    hostname_or_ip = table.Column<string>(type: "character varying(255)", maxLength: 255, nullable: false),
+                    port = table.Column<int>(type: "integer", nullable: false),
+                    mqtt_username = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
+                    mqtt_password = table.Column<string>(type: "character varying(500)", maxLength: 500, nullable: false),
+                    mqtt_use_tls = table.Column<bool>(type: "boolean", nullable: false, defaultValue: false),
+                    api_key = table.Column<string>(type: "character varying(500)", maxLength: 500, nullable: false),
+                    is_active = table.Column<bool>(type: "boolean", nullable: false, defaultValue: true),
+                    last_seen_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
+                    created_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'"),
+                    updated_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_printers", x => x.id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "material_finishes",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    name = table.Column<string>(type: "character varying(100)", maxLength: 100, nullable: false),
+                    material_base_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    created_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'"),
+                    updated_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_material_finishes", x => x.id);
+                    table.ForeignKey(
+                        name: "fk_material_finishes_material_base",
+                        column: x => x.material_base_id,
+                        principalTable: "material_bases",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Restrict);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "material_modifiers",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    name = table.Column<string>(type: "character varying(100)", maxLength: 100, nullable: false),
+                    material_base_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    created_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'"),
+                    updated_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_material_modifiers", x => x.id);
+                    table.ForeignKey(
+                        name: "fk_material_modifiers_material_base",
+                        column: x => x.material_base_id,
+                        principalTable: "material_bases",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Restrict);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "ams_units",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    unit_index = table.Column<int>(type: "integer", nullable: false),
+                    printer_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    created_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'"),
+                    updated_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_ams_units", x => x.id);
+                    table.ForeignKey(
+                        name: "fk_ams_units_printer",
+                        column: x => x.printer_id,
+                        principalTable: "printers",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "spools",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    material_base_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    material_finish_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    material_modifier_id = table.Column<Guid>(type: "uuid", nullable: true),
+                    brand = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
+                    color_name = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
+                    color_hex = table.Column<string>(type: "character varying(7)", maxLength: 7, nullable: false),
+                    weight_total_grams = table.Column<decimal>(type: "numeric(10,2)", precision: 10, scale: 2, nullable: false),
+                    weight_remaining_grams = table.Column<decimal>(type: "numeric(10,2)", precision: 10, scale: 2, nullable: false),
+                    filament_diameter_mm = table.Column<decimal>(type: "numeric(6,3)", precision: 6, scale: 3, nullable: false),
+                    spool_serial = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
+                    purchase_price = table.Column<decimal>(type: "numeric(10,2)", precision: 10, scale: 2, nullable: true),
+                    purchase_date = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
+                    is_active = table.Column<bool>(type: "boolean", nullable: false, defaultValue: true),
+                    created_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'"),
+                    updated_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_spools", x => x.id);
+                    table.ForeignKey(
+                        name: "fk_spools_material_base",
+                        column: x => x.material_base_id,
+                        principalTable: "material_bases",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "fk_spools_material_finish",
+                        column: x => x.material_finish_id,
+                        principalTable: "material_finishes",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "fk_spools_material_modifier",
+                        column: x => x.material_modifier_id,
+                        principalTable: "material_modifiers",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.SetNull);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "ams_slots",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    tray_index = table.Column<int>(type: "integer", nullable: false),
+                    ams_unit_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    spool_id = table.Column<Guid>(type: "uuid", nullable: true),
+                    remaining_weight_g = table.Column<decimal>(type: "numeric(10,2)", precision: 10, scale: 2, nullable: true),
+                    created_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'"),
+                    updated_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_ams_slots", x => x.id);
+                    table.ForeignKey(
+                        name: "fk_ams_slots_ams_unit",
+                        column: x => x.ams_unit_id,
+                        principalTable: "ams_units",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "fk_ams_slots_spool",
+                        column: x => x.spool_id,
+                        principalTable: "spools",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.SetNull);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "print_jobs",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    printer_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    spool_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    print_name = table.Column<string>(type: "character varying(500)", maxLength: 500, nullable: false),
+                    gcode_file_path = table.Column<string>(type: "character varying(1000)", maxLength: 1000, nullable: true),
+                    mm_extruded = table.Column<decimal>(type: "numeric(12,2)", precision: 12, scale: 2, nullable: false),
+                    grams_derived = table.Column<decimal>(type: "numeric(10,2)", precision: 10, scale: 2, nullable: false),
+                    cost_per_print = table.Column<decimal>(type: "numeric(10,4)", precision: 10, scale: 4, nullable: true),
+                    started_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
+                    completed_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: true),
+                    status = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false, defaultValue: "Queued"),
+                    data_source = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false),
+                    filament_diameter_at_print_mm = table.Column<decimal>(type: "numeric(6,3)", precision: 6, scale: 3, nullable: false),
+                    material_density_at_print = table.Column<decimal>(type: "numeric(10,4)", precision: 10, scale: 4, nullable: false),
+                    notes = table.Column<string>(type: "character varying(2000)", maxLength: 2000, nullable: true),
+                    created_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'"),
+                    updated_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_print_jobs", x => x.id);
+                    table.ForeignKey(
+                        name: "fk_print_jobs_printer",
+                        column: x => x.printer_id,
+                        principalTable: "printers",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "fk_print_jobs_spool",
+                        column: x => x.spool_id,
+                        principalTable: "spools",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Restrict);
+                });
+
+            migrationBuilder.InsertData(
+                table: "material_bases",
+                columns: new[] { "id", "created_at", "density_g_per_cm3", "name", "updated_at" },
+                values: new object[,]
+                {
+                    { new Guid("10000000-0000-0000-0000-000000000001"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1096), 1.24m, "PLA", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1096) },
+                    { new Guid("10000000-0000-0000-0000-000000000002"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1620), 1.27m, "PETG", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1620) },
+                    { new Guid("10000000-0000-0000-0000-000000000003"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1630), 1.04m, "ABS", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1630) },
+                    { new Guid("10000000-0000-0000-0000-000000000004"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1638), 1.07m, "ASA", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1638) },
+                    { new Guid("10000000-0000-0000-0000-000000000005"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1645), 1.21m, "TPU", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1645) },
+                    { new Guid("10000000-0000-0000-0000-000000000006"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1651), 1.14m, "Nylon", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1652) }
+                });
+
+            migrationBuilder.InsertData(
+                table: "material_finishes",
+                columns: new[] { "id", "created_at", "material_base_id", "name", "updated_at" },
+                values: new object[,]
+                {
+                    { new Guid("20000000-0000-0000-0000-000000000001"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1850), new Guid("10000000-0000-0000-0000-000000000001"), "Basic", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1850) },
+                    { new Guid("20000000-0000-0000-0000-000000000002"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2041), new Guid("10000000-0000-0000-0000-000000000001"), "Matte", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2041) },
+                    { new Guid("20000000-0000-0000-0000-000000000003"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2049), new Guid("10000000-0000-0000-0000-000000000001"), "Silk", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2049) },
+                    { new Guid("20000000-0000-0000-0000-000000000004"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2055), new Guid("10000000-0000-0000-0000-000000000001"), "Glitter", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2056) },
+                    { new Guid("20000000-0000-0000-0000-000000000005"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2062), new Guid("10000000-0000-0000-0000-000000000001"), "Marble", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2062) },
+                    { new Guid("20000000-0000-0000-0000-000000000006"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2068), new Guid("10000000-0000-0000-0000-000000000001"), "Sparkle", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2068) },
+                    { new Guid("20000000-0000-0000-0000-000000000007"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2075), new Guid("10000000-0000-0000-0000-000000000002"), "Basic", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2075) },
+                    { new Guid("20000000-0000-0000-0000-000000000008"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2081), new Guid("10000000-0000-0000-0000-000000000002"), "Matte", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2081) },
+                    { new Guid("20000000-0000-0000-0000-000000000009"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2100), new Guid("10000000-0000-0000-0000-000000000002"), "Silk", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2100) },
+                    { new Guid("20000000-0000-0000-0000-000000000010"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2107), new Guid("10000000-0000-0000-0000-000000000003"), "Basic", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2107) },
+                    { new Guid("20000000-0000-0000-0000-000000000011"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2113), new Guid("10000000-0000-0000-0000-000000000003"), "Matte", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2113) },
+                    { new Guid("20000000-0000-0000-0000-000000000012"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2120), new Guid("10000000-0000-0000-0000-000000000004"), "Basic", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2120) },
+                    { new Guid("20000000-0000-0000-0000-000000000013"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2126), new Guid("10000000-0000-0000-0000-000000000004"), "Matte", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2126) },
+                    { new Guid("20000000-0000-0000-0000-000000000014"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2132), new Guid("10000000-0000-0000-0000-000000000005"), "Basic", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2133) },
+                    { new Guid("20000000-0000-0000-0000-000000000015"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2139), new Guid("10000000-0000-0000-0000-000000000006"), "Basic", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2139) }
+                });
+
+            migrationBuilder.InsertData(
+                table: "material_modifiers",
+                columns: new[] { "id", "created_at", "material_base_id", "name", "updated_at" },
+                values: new object[,]
+                {
+                    { new Guid("30000000-0000-0000-0000-000000000001"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2304), new Guid("10000000-0000-0000-0000-000000000001"), "Carbon Fiber", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2304) },
+                    { new Guid("30000000-0000-0000-0000-000000000002"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2463), new Guid("10000000-0000-0000-0000-000000000001"), "Glass Fiber", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2463) },
+                    { new Guid("30000000-0000-0000-0000-000000000003"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2471), new Guid("10000000-0000-0000-0000-000000000001"), "Wood Fill", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2471) },
+                    { new Guid("30000000-0000-0000-0000-000000000004"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2477), new Guid("10000000-0000-0000-0000-000000000001"), "Glow-in-the-Dark", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2478) },
+                    { new Guid("30000000-0000-0000-0000-000000000005"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2484), new Guid("10000000-0000-0000-0000-000000000002"), "Carbon Fiber", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2484) },
+                    { new Guid("30000000-0000-0000-0000-000000000006"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2490), new Guid("10000000-0000-0000-0000-000000000002"), "Glass Fiber", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2491) },
+                    { new Guid("30000000-0000-0000-0000-000000000007"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2497), new Guid("10000000-0000-0000-0000-000000000003"), "Carbon Fiber", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2497) },
+                    { new Guid("30000000-0000-0000-0000-000000000008"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2503), new Guid("10000000-0000-0000-0000-000000000003"), "Glass Fiber", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2503) },
+                    { new Guid("30000000-0000-0000-0000-000000000009"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2510), new Guid("10000000-0000-0000-0000-000000000004"), "Carbon Fiber", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2510) },
+                    { new Guid("30000000-0000-0000-0000-000000000010"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2516), new Guid("10000000-0000-0000-0000-000000000006"), "Carbon Fiber", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2516) },
+                    { new Guid("30000000-0000-0000-0000-000000000011"), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2522), new Guid("10000000-0000-0000-0000-000000000006"), "Glass Fiber", new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2523) }
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "ix_ams_slots_ams_unit_id_tray_index",
+                table: "ams_slots",
+                columns: new[] { "ams_unit_id", "tray_index" },
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "ix_ams_slots_spool_id",
+                table: "ams_slots",
+                column: "spool_id");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_ams_units_printer_id_unit_index",
+                table: "ams_units",
+                columns: new[] { "printer_id", "unit_index" },
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "ix_material_bases_name",
+                table: "material_bases",
+                column: "name",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "ix_material_finishes_material_base_id_name",
+                table: "material_finishes",
+                columns: new[] { "material_base_id", "name" },
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "ix_material_modifiers_material_base_id_name",
+                table: "material_modifiers",
+                columns: new[] { "material_base_id", "name" },
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "ix_print_jobs_data_source",
+                table: "print_jobs",
+                column: "data_source");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_print_jobs_printer_id",
+                table: "print_jobs",
+                column: "printer_id");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_print_jobs_spool_id",
+                table: "print_jobs",
+                column: "spool_id");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_print_jobs_status",
+                table: "print_jobs",
+                column: "status");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_printers_connection_type",
+                table: "printers",
+                column: "connection_type");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_printers_is_active",
+                table: "printers",
+                column: "is_active");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_printers_printer_type",
+                table: "printers",
+                column: "printer_type");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_printers_status",
+                table: "printers",
+                column: "status");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_spools_is_active",
+                table: "spools",
+                column: "is_active");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_spools_material_base_id",
+                table: "spools",
+                column: "material_base_id");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_spools_material_finish_id",
+                table: "spools",
+                column: "material_finish_id");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_spools_material_modifier_id",
+                table: "spools",
+                column: "material_modifier_id");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_spools_spool_serial",
+                table: "spools",
+                column: "spool_serial",
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "ams_slots");
+
+            migrationBuilder.DropTable(
+                name: "print_jobs");
+
+            migrationBuilder.DropTable(
+                name: "ams_units");
+
+            migrationBuilder.DropTable(
+                name: "spools");
+
+            migrationBuilder.DropTable(
+                name: "printers");
+
+            migrationBuilder.DropTable(
+                name: "material_finishes");
+
+            migrationBuilder.DropTable(
+                name: "material_modifiers");
+
+            migrationBuilder.DropTable(
+                name: "material_bases");
+        }
+    }
+}

backend/Infrastructure/Data/Migrations/20260426184329_AddUsageLogTable.cs

@@ -0,0 +1,534 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Extrudex.Infrastructure.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddUsageLogTable : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "usage_logs",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    spool_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    printer_id = table.Column<Guid>(type: "uuid", nullable: true),
+                    print_job_id = table.Column<Guid>(type: "uuid", nullable: true),
+                    grams_used = table.Column<decimal>(type: "numeric(10,2)", precision: 10, scale: 2, nullable: false),
+                    mm_extruded = table.Column<decimal>(type: "numeric(12,2)", precision: 12, scale: 2, nullable: true),
+                    usage_timestamp = table.Column<DateTime>(type: "timestamp with time zone", nullable: false),
+                    data_source = table.Column<string>(type: "character varying(50)", maxLength: 50, nullable: false),
+                    notes = table.Column<string>(type: "character varying(2000)", maxLength: 2000, nullable: true),
+                    created_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'"),
+                    updated_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false, defaultValueSql: "now() at time zone 'utc'")
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_usage_logs", x => x.id);
+                    table.ForeignKey(
+                        name: "fk_usage_logs_print_job",
+                        column: x => x.print_job_id,
+                        principalTable: "print_jobs",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.SetNull);
+                    table.ForeignKey(
+                        name: "fk_usage_logs_printer",
+                        column: x => x.printer_id,
+                        principalTable: "printers",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.SetNull);
+                    table.ForeignKey(
+                        name: "fk_usage_logs_spool",
+                        column: x => x.spool_id,
+                        principalTable: "spools",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Restrict);
+                });
+
+            migrationBuilder.UpdateData(
+                table: "material_bases",
+                keyColumn: "id",
+                keyValue: new Guid("10000000-0000-0000-0000-000000000001"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(6535), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(6535) });
+
+            migrationBuilder.UpdateData(
+                table: "material_bases",
+                keyColumn: "id",
+                keyValue: new Guid("10000000-0000-0000-0000-000000000002"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7016), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7016) });
+
+            migrationBuilder.UpdateData(
+                table: "material_bases",
+                keyColumn: "id",
+                keyValue: new Guid("10000000-0000-0000-0000-000000000003"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7027), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7028) });
+
+            migrationBuilder.UpdateData(
+                table: "material_bases",
+                keyColumn: "id",
+                keyValue: new Guid("10000000-0000-0000-0000-000000000004"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7034), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7035) });
+
+            migrationBuilder.UpdateData(
+                table: "material_bases",
+                keyColumn: "id",
+                keyValue: new Guid("10000000-0000-0000-0000-000000000005"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7042), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7042) });
+
+            migrationBuilder.UpdateData(
+                table: "material_bases",
+                keyColumn: "id",
+                keyValue: new Guid("10000000-0000-0000-0000-000000000006"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7049), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7049) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000001"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7291), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7292) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000002"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7453), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7453) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000003"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7461), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7461) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000004"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7468), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7468) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000005"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7474), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7474) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000006"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7480), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7481) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000007"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7487), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7487) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000008"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7493), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7493) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000009"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7500), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7500) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000010"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7507), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7507) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000011"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7513), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7513) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000012"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7519), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7520) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000013"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7526), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7526) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000014"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7532), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7532) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000015"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7538), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7539) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000001"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7690), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7690) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000002"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7838), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7838) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000003"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7846), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7846) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000004"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7853), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7853) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000005"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7859), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7859) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000006"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7865), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7866) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000007"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7872), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7872) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000008"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7878), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7879) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000009"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7885), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7885) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000010"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7891), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7891) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000011"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7898), new DateTime(2026, 4, 26, 18, 43, 28, 895, DateTimeKind.Utc).AddTicks(7898) });
+
+            migrationBuilder.CreateIndex(
+                name: "ix_usage_logs_data_source",
+                table: "usage_logs",
+                column: "data_source");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_usage_logs_print_job_id",
+                table: "usage_logs",
+                column: "print_job_id");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_usage_logs_printer_id",
+                table: "usage_logs",
+                column: "printer_id");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_usage_logs_spool_id",
+                table: "usage_logs",
+                column: "spool_id");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_usage_logs_usage_timestamp",
+                table: "usage_logs",
+                column: "usage_timestamp");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "usage_logs");
+
+            migrationBuilder.UpdateData(
+                table: "material_bases",
+                keyColumn: "id",
+                keyValue: new Guid("10000000-0000-0000-0000-000000000001"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1096), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1096) });
+
+            migrationBuilder.UpdateData(
+                table: "material_bases",
+                keyColumn: "id",
+                keyValue: new Guid("10000000-0000-0000-0000-000000000002"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1620), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1620) });
+
+            migrationBuilder.UpdateData(
+                table: "material_bases",
+                keyColumn: "id",
+                keyValue: new Guid("10000000-0000-0000-0000-000000000003"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1630), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1630) });
+
+            migrationBuilder.UpdateData(
+                table: "material_bases",
+                keyColumn: "id",
+                keyValue: new Guid("10000000-0000-0000-0000-000000000004"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1638), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1638) });
+
+            migrationBuilder.UpdateData(
+                table: "material_bases",
+                keyColumn: "id",
+                keyValue: new Guid("10000000-0000-0000-0000-000000000005"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1645), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1645) });
+
+            migrationBuilder.UpdateData(
+                table: "material_bases",
+                keyColumn: "id",
+                keyValue: new Guid("10000000-0000-0000-0000-000000000006"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1651), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1652) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000001"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1850), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(1850) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000002"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2041), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2041) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000003"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2049), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2049) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000004"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2055), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2056) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000005"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2062), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2062) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000006"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2068), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2068) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000007"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2075), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2075) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000008"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2081), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2081) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000009"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2100), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2100) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000010"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2107), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2107) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000011"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2113), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2113) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000012"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2120), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2120) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000013"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2126), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2126) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000014"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2132), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2133) });
+
+            migrationBuilder.UpdateData(
+                table: "material_finishes",
+                keyColumn: "id",
+                keyValue: new Guid("20000000-0000-0000-0000-000000000015"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2139), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2139) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000001"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2304), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2304) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000002"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2463), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2463) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000003"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2471), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2471) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000004"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2477), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2478) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000005"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2484), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2484) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000006"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2490), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2491) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000007"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2497), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2497) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000008"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2503), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2503) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000009"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2510), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2510) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000010"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2516), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2516) });
+
+            migrationBuilder.UpdateData(
+                table: "material_modifiers",
+                keyColumn: "id",
+                keyValue: new Guid("30000000-0000-0000-0000-000000000011"),
+                columns: new[] { "created_at", "updated_at" },
+                values: new object[] { new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2522), new DateTime(2026, 4, 26, 13, 14, 18, 745, DateTimeKind.Utc).AddTicks(2523) });
+        }
+    }
+}

backend/Infrastructure/Services/UsageLogService.cs

@@ -0,0 +1,81 @@
+using Extrudex.Domain.Entities;
+using Extrudex.Domain.Enums;
+using Extrudex.Domain.Interfaces;
+using Extrudex.Infrastructure.Data;
+using Microsoft.EntityFrameworkCore;
+
+namespace Extrudex.Infrastructure.Services;
+
+/// <summary>
+/// Implementation of <see cref="IUsageLogService"/> that persists usage entries
+/// to the usage_logs table via EF Core.
+/// </summary>
+public class UsageLogService : IUsageLogService
+{
+    private readonly ExtrudexDbContext _dbContext;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="UsageLogService"/> class.
+    /// </summary>
+    /// <param name="dbContext">The EF Core database context for data persistence.</param>
+    public UsageLogService(ExtrudexDbContext dbContext)
+    {
+        _dbContext = dbContext;
+    }
+
+    /// <inheritdoc/>
+    public async Task<UsageLog> RecordUsageAsync(
+        Guid spoolId,
+        decimal gramsUsed,
+        DataSource dataSource,
+        Guid? printerId = null,
+        Guid? printJobId = null,
+        decimal? mmExtruded = null,
+        DateTime? usageTimestamp = null,
+        string? notes = null)
+    {
+        var entry = new UsageLog
+        {
+            SpoolId = spoolId,
+            GramsUsed = gramsUsed,
+            DataSource = dataSource,
+            PrinterId = printerId,
+            PrintJobId = printJobId,
+            MmExtruded = mmExtruded,
+            UsageTimestamp = usageTimestamp ?? DateTime.UtcNow,
+            Notes = notes
+        };
+
+        _dbContext.UsageLogs.Add(entry);
+        await _dbContext.SaveChangesAsync();
+
+        return entry;
+    }
+
+    /// <inheritdoc/>
+    public async Task<IEnumerable<UsageLog>> GetBySpoolAsync(Guid spoolId, CancellationToken cancellationToken = default)
+    {
+        return await _dbContext.UsageLogs
+            .Where(u => u.SpoolId == spoolId)
+            .OrderByDescending(u => u.UsageTimestamp)
+            .ToListAsync(cancellationToken);
+    }
+
+    /// <inheritdoc/>
+    public async Task<IEnumerable<UsageLog>> GetByPrinterAsync(Guid printerId, CancellationToken cancellationToken = default)
+    {
+        return await _dbContext.UsageLogs
+            .Where(u => u.PrinterId == printerId)
+            .OrderByDescending(u => u.UsageTimestamp)
+            .ToListAsync(cancellationToken);
+    }
+
+    /// <inheritdoc/>
+    public async Task<IEnumerable<UsageLog>> GetByPrintJobAsync(Guid printJobId, CancellationToken cancellationToken = default)
+    {
+        return await _dbContext.UsageLogs
+            .Where(u => u.PrintJobId == printJobId)
+            .OrderByDescending(u => u.UsageTimestamp)
+            .ToListAsync(cancellationToken);
+    }
+}

backend/Program.cs

@@ -46,6 +46,9 @@ builder.Services.AddSwaggerGen(c =>
 // ── QR Code Generation ──────────────────────────────────────
 builder.Services.AddSingleton<IQrCodeService, QrCodeService>();
 
+// ── Usage Logging ───────────────────────────────────────────
+builder.Services.AddScoped<IUsageLogService, UsageLogService>();
+
 // ── FluentValidation ──────────────────────────────────────
 // Registers all validators from the API assembly into DI.
 builder.Services.AddValidatorsFromAssembly(Assembly.GetExecutingAssembly());
@@ -69,6 +72,10 @@ builder.Services.AddCors(options =>
 // ── SignalR (real-time printer updates) ────────────────────
 builder.Services.AddSignalR();
 
+// ── Health Checks ───────────────────────────────────────────
+builder.Services.AddHealthChecks()
+    .AddNpgSql(connectionString);
+
 var app = builder.Build();
 
 // ── Middleware ──────────────────────────────────────────────
@@ -85,6 +92,9 @@ app.MapControllers();
 // ── Hub Endpoints ───────────────────────────────────────────
 app.MapHub<PrinterHub>("/hubs/printer");
 
+// ── Health Check Endpoint ──────────────────────────────────
+app.MapHealthChecks("/health");
+
 app.Run();
 
 // Helper: builds a connection string from individual env vars.

deploy.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+set -e
+
+echo "🔧 Deploying Extrudex Docker runtime..."
+
+# Check if Docker Compose is available
+if ! command -v docker-compose &> /dev/null && ! docker compose version &> /dev/null; then
+    echo "❌ Docker Compose is not installed"
+    exit 1
+fi
+
+COMPOSE_CMD="docker compose"
+if command -v docker-compose &> /dev/null; then
+    COMPOSE_CMD="docker-compose"
+fi
+
+echo "📦 Building and starting services..."
+$COMPOSE_CMD -f docker-compose.dev.yml up -d --build
+
+echo "⏳ Waiting for services to become healthy..."
+sleep 10
+
+echo "✅ Deployment complete!"
+echo ""
+echo "Services running:"
+echo "  • Extrudex API: http://localhost:5080"
+echo "  • Control Center Web: http://localhost:5081"
+echo ""
+echo "To view logs:"
+echo "  $COMPOSE_CMD -f docker-compose.dev.yml logs -f"
+echo ""
+echo "To stop:"
+echo "  $COMPOSE_CMD -f docker-compose.dev.yml down"

docker-compose.dev.yml

@@ -0,0 +1,40 @@
+version: '3.8'
+
+services:
+  extrudex-api:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+    container_name: extrudex-api
+    ports:
+      - "5080:8080"
+    environment:
+      - ASPNETCORE_ENVIRONMENT=Development
+      - ASPNETCORE_URLS=http://+:8080
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+    networks:
+      - extrudex-network
+
+  control-center-web:
+    build:
+      context: ../Control-Center/frontend
+      dockerfile: Dockerfile
+    container_name: control-center-web
+    ports:
+      - "5081:80"
+    depends_on:
+      extrudex-api:
+        condition: service_healthy
+    restart: unless-stopped
+    networks:
+      - extrudex-network
+
+networks:
+  extrudex-network:
+    driver: bridge

frontend/.editorconfig

@@ -1,16 +0,0 @@
-# Editor configuration, see https://editorconfig.org
-root = true
-
-[*]
-charset = utf-8
-indent_style = space
-indent_size = 2
-insert_final_newline = true
-trim_trailing_whitespace = true
-
-[*.ts]
-quote_type = single
-
-[*.md]
-max_line_length = off
-trim_trailing_whitespace = false

frontend/.gitignore

@@ -1,42 +0,0 @@
-# See https://docs.github.com/get-started/getting-started-with-git/ignoring-files for more about ignoring files.
-
-# Compiled output
-/dist
-/tmp
-/out-tsc
-/bazel-out
-
-# Node
-/node_modules
-npm-debug.log
-yarn-error.log
-
-# IDEs and editors
-.idea/
-.project
-.classpath
-.c9/
-*.launch
-.settings/
-*.sublime-workspace
-
-# Visual Studio Code
-.vscode/*
-!.vscode/settings.json
-!.vscode/tasks.json
-!.vscode/launch.json
-!.vscode/extensions.json
-.history/*
-
-# Miscellaneous
-/.angular/cache
-.sass-cache/
-/connect.lock
-/coverage
-/libpeerconnection.log
-testem.log
-/typings
-
-# System files
-.DS_Store
-Thumbs.db

frontend/.vscode/extensions.json

@@ -1,4 +0,0 @@
-{
-  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=827846
-  "recommendations": ["angular.ng-template"]
-}

frontend/.vscode/launch.json

@@ -1,20 +0,0 @@
-{
-  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
-  "version": "0.2.0",
-  "configurations": [
-    {
-      "name": "ng serve",
-      "type": "chrome",
-      "request": "launch",
-      "preLaunchTask": "npm: start",
-      "url": "http://localhost:4200/"
-    },
-    {
-      "name": "ng test",
-      "type": "chrome",
-      "request": "launch",
-      "preLaunchTask": "npm: test",
-      "url": "http://localhost:9876/debug.html"
-    }
-  ]
-}

frontend/.vscode/tasks.json

@@ -1,42 +0,0 @@
-{
-  // For more information, visit: https://go.microsoft.com/fwlink/?LinkId=733558
-  "version": "2.0.0",
-  "tasks": [
-    {
-      "type": "npm",
-      "script": "start",
-      "isBackground": true,
-      "problemMatcher": {
-        "owner": "typescript",
-        "pattern": "$tsc",
-        "background": {
-          "activeOnStart": true,
-          "beginsPattern": {
-            "regexp": "(.*?)"
-          },
-          "endsPattern": {
-            "regexp": "bundle generation complete"
-          }
-        }
-      }
-    },
-    {
-      "type": "npm",
-      "script": "test",
-      "isBackground": true,
-      "problemMatcher": {
-        "owner": "typescript",
-        "pattern": "$tsc",
-        "background": {
-          "activeOnStart": true,
-          "beginsPattern": {
-            "regexp": "(.*?)"
-          },
-          "endsPattern": {
-            "regexp": "bundle generation complete"
-          }
-        }
-      }
-    }
-  ]
-}

frontend/README.md

@@ -1,27 +0,0 @@
-# Frontend
-
-This project was generated with [Angular CLI](https://github.com/angular/angular-cli) version 17.3.17.
-
-## Development server
-
-Run `ng serve` for a dev server. Navigate to `http://localhost:4200/`. The application will automatically reload if you change any of the source files.
-
-## Code scaffolding
-
-Run `ng generate component component-name` to generate a new component. You can also use `ng generate directive|pipe|service|class|guard|interface|enum|module`.
-
-## Build
-
-Run `ng build` to build the project. The build artifacts will be stored in the `dist/` directory.
-
-## Running unit tests
-
-Run `ng test` to execute the unit tests via [Karma](https://karma-runner.github.io).
-
-## Running end-to-end tests
-
-Run `ng e2e` to execute the end-to-end tests via a platform of your choice. To use this command, you need to first add a package that implements end-to-end testing capabilities.
-
-## Further help
-
-To get more help on the Angular CLI use `ng help` or go check out the [Angular CLI Overview and Command Reference](https://angular.io/cli) page.

frontend/angular.json

@@ -1,123 +0,0 @@
-{
-  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
-  "version": 1,
-  "newProjectRoot": "projects",
-  "projects": {
-    "frontend": {
-      "projectType": "application",
-      "schematics": {
-        "@schematics/angular:component": {
-          "style": "scss",
-          "skipTests": true
-        },
-        "@schematics/angular:class": {
-          "skipTests": true
-        },
-        "@schematics/angular:directive": {
-          "skipTests": true
-        },
-        "@schematics/angular:guard": {
-          "skipTests": true
-        },
-        "@schematics/angular:interceptor": {
-          "skipTests": true
-        },
-        "@schematics/angular:pipe": {
-          "skipTests": true
-        },
-        "@schematics/angular:resolver": {
-          "skipTests": true
-        },
-        "@schematics/angular:service": {
-          "skipTests": true
-        }
-      },
-      "root": "",
-      "sourceRoot": "src",
-      "prefix": "app",
-      "architect": {
-        "build": {
-          "builder": "@angular-devkit/build-angular:application",
-          "options": {
-            "outputPath": "dist/frontend",
-            "index": "src/index.html",
-            "browser": "src/main.ts",
-            "polyfills": [
-              "zone.js"
-            ],
-            "tsConfig": "tsconfig.app.json",
-            "inlineStyleLanguage": "scss",
-            "assets": [
-              "src/favicon.ico",
-              "src/assets"
-            ],
-            "styles": [
-              "src/styles.scss"
-            ],
-            "scripts": []
-          },
-          "configurations": {
-            "production": {
-              "budgets": [
-                {
-                  "type": "initial",
-                  "maximumWarning": "500kb",
-                  "maximumError": "1mb"
-                },
-                {
-                  "type": "anyComponentStyle",
-                  "maximumWarning": "2kb",
-                  "maximumError": "4kb"
-                }
-              ],
-              "outputHashing": "all"
-            },
-            "development": {
-              "optimization": false,
-              "extractLicenses": false,
-              "sourceMap": true
-            }
-          },
-          "defaultConfiguration": "production"
-        },
-        "serve": {
-          "builder": "@angular-devkit/build-angular:dev-server",
-          "configurations": {
-            "production": {
-              "buildTarget": "frontend:build:production"
-            },
-            "development": {
-              "buildTarget": "frontend:build:development"
-            }
-          },
-          "defaultConfiguration": "development"
-        },
-        "extract-i18n": {
-          "builder": "@angular-devkit/build-angular:extract-i18n",
-          "options": {
-            "buildTarget": "frontend:build"
-          }
-        },
-        "test": {
-          "builder": "@angular-devkit/build-angular:karma",
-          "options": {
-            "polyfills": [
-              "zone.js",
-              "zone.js/testing"
-            ],
-            "tsConfig": "tsconfig.spec.json",
-            "inlineStyleLanguage": "scss",
-            "assets": [
-              "src/favicon.ico",
-              "src/assets"
-            ],
-            "styles": [
-              "src/styles.scss"
-            ],
-            "scripts": []
-          }
-        }
-      }
-    }
-  }
-}

frontend/package.json

@@ -1,40 +0,0 @@
-{
-  "name": "frontend",
-  "version": "0.0.0",
-  "scripts": {
-    "ng": "ng",
-    "start": "ng serve",
-    "build": "ng build",
-    "watch": "ng build --watch --configuration development",
-    "test": "ng test"
-  },
-  "private": true,
-  "dependencies": {
-    "@angular/animations": "^17.3.0",
-    "@angular/common": "^17.3.0",
-    "@angular/compiler": "^17.3.0",
-    "@angular/core": "^17.3.0",
-    "@angular/forms": "^17.3.0",
-    "@angular/material": "^17.3.10",
-    "@angular/platform-browser": "^17.3.0",
-    "@angular/platform-browser-dynamic": "^17.3.0",
-    "@angular/router": "^17.3.0",
-    "@microsoft/signalr": "^10.0.0",
-    "rxjs": "~7.8.0",
-    "tslib": "^2.3.0",
-    "zone.js": "~0.14.3"
-  },
-  "devDependencies": {
-    "@angular-devkit/build-angular": "^17.3.17",
-    "@angular/cli": "^17.3.17",
-    "@angular/compiler-cli": "^17.3.0",
-    "@types/jasmine": "~5.1.0",
-    "jasmine-core": "~5.1.0",
-    "karma": "~6.4.0",
-    "karma-chrome-launcher": "~3.2.0",
-    "karma-coverage": "~2.2.0",
-    "karma-jasmine": "~5.1.0",
-    "karma-jasmine-html-reporter": "~2.1.0",
-    "typescript": "~5.4.2"
-  }
-}

frontend/src/app/app.component.html

@@ -1,336 +0,0 @@
-<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
-<!-- * * * * * * * * * * * The content below * * * * * * * * * * * -->
-<!-- * * * * * * * * * * is only a placeholder * * * * * * * * * * -->
-<!-- * * * * * * * * * * and can be replaced.  * * * * * * * * * * -->
-<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
-<!-- * * * * * * * * * Delete the template below * * * * * * * * * -->
-<!-- * * * * * * * to get started with your project! * * * * * * * -->
-<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
-
-<style>
-  :host {
-    --bright-blue: oklch(51.01% 0.274 263.83);
-    --electric-violet: oklch(53.18% 0.28 296.97);
-    --french-violet: oklch(47.66% 0.246 305.88);
-    --vivid-pink: oklch(69.02% 0.277 332.77);
-    --hot-red: oklch(61.42% 0.238 15.34);
-    --orange-red: oklch(63.32% 0.24 31.68);
-
-    --gray-900: oklch(19.37% 0.006 300.98);
-    --gray-700: oklch(36.98% 0.014 302.71);
-    --gray-400: oklch(70.9% 0.015 304.04);
-
-    --red-to-pink-to-purple-vertical-gradient: linear-gradient(
-      180deg,
-      var(--orange-red) 0%,
-      var(--vivid-pink) 50%,
-      var(--electric-violet) 100%
-    );
-
-    --red-to-pink-to-purple-horizontal-gradient: linear-gradient(
-      90deg,
-      var(--orange-red) 0%,
-      var(--vivid-pink) 50%,
-      var(--electric-violet) 100%
-    );
-
-    --pill-accent: var(--bright-blue);
-
-    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
-      Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
-      "Segoe UI Symbol";
-    box-sizing: border-box;
-    -webkit-font-smoothing: antialiased;
-    -moz-osx-font-smoothing: grayscale;
-  }
-
-  h1 {
-    font-size: 3.125rem;
-    color: var(--gray-900);
-    font-weight: 500;
-    line-height: 100%;
-    letter-spacing: -0.125rem;
-    margin: 0;
-    font-family: "Inter Tight", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
-      Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
-      "Segoe UI Symbol";
-  }
-
-  p {
-    margin: 0;
-    color: var(--gray-700);
-  }
-
-  main {
-    width: 100%;
-    min-height: 100%;
-    display: flex;
-    justify-content: center;
-    align-items: center;
-    padding: 1rem;
-    box-sizing: inherit;
-    position: relative;
-  }
-
-  .angular-logo {
-    max-width: 9.2rem;
-  }
-
-  .content {
-    display: flex;
-    justify-content: space-around;
-    width: 100%;
-    max-width: 700px;
-    margin-bottom: 3rem;
-  }
-
-  .content h1 {
-    margin-top: 1.75rem;
-  }
-
-  .content p {
-    margin-top: 1.5rem;
-  }
-
-  .divider {
-    width: 1px;
-    background: var(--red-to-pink-to-purple-vertical-gradient);
-    margin-inline: 0.5rem;
-  }
-
-  .pill-group {
-    display: flex;
-    flex-direction: column;
-    align-items: start;
-    flex-wrap: wrap;
-    gap: 1.25rem;
-  }
-
-  .pill {
-    display: flex;
-    align-items: center;
-    --pill-accent: var(--bright-blue);
-    background: color-mix(in srgb, var(--pill-accent) 5%, transparent);
-    color: var(--pill-accent);
-    padding-inline: 0.75rem;
-    padding-block: 0.375rem;
-    border-radius: 2.75rem;
-    border: 0;
-    transition: background 0.3s ease;
-    font-family: var(--inter-font);
-    font-size: 0.875rem;
-    font-style: normal;
-    font-weight: 500;
-    line-height: 1.4rem;
-    letter-spacing: -0.00875rem;
-    text-decoration: none;
-  }
-
-  .pill:hover {
-    background: color-mix(in srgb, var(--pill-accent) 15%, transparent);
-  }
-
-  .pill-group .pill:nth-child(6n + 1) {
-    --pill-accent: var(--bright-blue);
-  }
-  .pill-group .pill:nth-child(6n + 2) {
-    --pill-accent: var(--french-violet);
-  }
-  .pill-group .pill:nth-child(6n + 3),
-  .pill-group .pill:nth-child(6n + 4),
-  .pill-group .pill:nth-child(6n + 5) {
-    --pill-accent: var(--hot-red);
-  }
-
-  .pill-group svg {
-    margin-inline-start: 0.25rem;
-  }
-
-  .social-links {
-    display: flex;
-    align-items: center;
-    gap: 0.73rem;
-    margin-top: 1.5rem;
-  }
-
-  .social-links path {
-    transition: fill 0.3s ease;
-    fill: var(--gray-400);
-  }
-
-  .social-links a:hover svg path {
-    fill: var(--gray-900);
-  }
-
-  @media screen and (max-width: 650px) {
-    .content {
-      flex-direction: column;
-      width: max-content;
-    }
-
-    .divider {
-      height: 1px;
-      width: 100%;
-      background: var(--red-to-pink-to-purple-horizontal-gradient);
-      margin-block: 1.5rem;
-    }
-  }
-</style>
-
-<main class="main">
-  <div class="content">
-    <div class="left-side">
-      <svg
-        xmlns="http://www.w3.org/2000/svg"
-        viewBox="0 0 982 239"
-        fill="none"
-        class="angular-logo"
-      >
-        <g clip-path="url(#a)">
-          <path
-            fill="url(#b)"
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-      <h1>Hello, {{ title }}</h1>
-      <p>Congratulations! Your app is running. 🎉</p>
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frontend/src/app/app.component.ts

@@ -1,13 +0,0 @@
-import { Component } from '@angular/core';
-import { RouterOutlet } from '@angular/router';
-
-@Component({
-  selector: 'app-root',
-  standalone: true,
-  imports: [RouterOutlet],
-  templateUrl: './app.component.html',
-  styleUrl: './app.component.scss'
-})
-export class AppComponent {
-  title = 'frontend';
-}

frontend/src/app/app.config.ts

@@ -1,12 +0,0 @@
-import { ApplicationConfig } from '@angular/core';
-import { provideRouter } from '@angular/router';
-
-import { routes } from './app.routes';
-import { provideAgentStatusInitializer } from './services/agent-status-initializer';
-
-export const appConfig: ApplicationConfig = {
-  providers: [
-    provideRouter(routes),
-    ...provideAgentStatusInitializer(),
-  ]
-};

frontend/src/app/app.routes.ts

@@ -1,3 +0,0 @@
-import { Routes } from '@angular/router';
-
-export const routes: Routes = [];

frontend/src/app/models/agent-status.ts

@@ -1,15 +0,0 @@
-/**
- * Data models for agent status updates received via SignalR.
- */
-
-/** Represents a single agent status update pushed from the server. */
-export interface AgentStatusUpdate {
-  /** Unique identifier of the agent whose status changed. */
-  agentId: string;
-
-  /** Current operational status of the agent (e.g., "Online", "Offline", "Busy", "Error"). */
-  status: string;
-
-  /** ISO 8601 timestamp of when this status was observed, or null if unknown. */
-  lastSeenAt: string | null;
-}

frontend/src/app/services/agent-status-initializer.ts

@@ -1,24 +0,0 @@
-import { APP_INITIALIZER, Provider } from '@angular/core';
-import { AgentStatusService } from './agent-status.service';
-
-/**
- * Provider that starts the AgentStatusService SignalR connection
- * during application initialization. Inject this in your app config
- * providers array to ensure the hub connection is established on startup.
- *
- * Usage in app.config.ts:
- *   providers: [provideAgentStatusInitializer()]
- */
-export function provideAgentStatusInitializer(): Provider[] {
-  return [
-    {
-      provide: APP_INITIALIZER,
-      useFactory: (agentStatusService: AgentStatusService) => () => {
-        // Fire-and-forget: connection errors are logged by the service
-        agentStatusService.startConnection();
-      },
-      multi: true,
-      deps: [AgentStatusService],
-    },
-  ];
-}

frontend/src/app/services/agent-status.service.ts

@@ -1,141 +0,0 @@
-import { Injectable, OnDestroy } from '@angular/core';
-import { BehaviorSubject, Observable, Subject, Subscription } from 'rxjs';
-import * as signalR from '@microsoft/signalr';
-
-import { AgentStatusUpdate } from '../models/agent-status';
-
-/**
- * Angular service that manages a SignalR connection to the agent status hub
- * and exposes real-time status updates as observables.
- *
- * Usage:
- *   Inject `AgentStatusService` and subscribe to `onStatusUpdate()`
- *   to receive push notifications whenever an agent's status changes.
- *
- * The connection is established automatically on app start via
- * `APP_INITIALIZER` (configured in `app.config.ts`) and cleaned up
- * when the service is destroyed.
- */
-@Injectable({ providedIn: 'root' })
-export class AgentStatusService implements OnDestroy {
-  /** Base URL for the SignalR hub endpoint. */
-  private readonly hubUrl = '/hub';
-
-  /** Underlying SignalR connection instance. */
-  private hubConnection: signalR.HubConnection | null = null;
-
-  /** Internal subject that emits status updates received from the hub. */
-  private readonly statusUpdateSubject = new Subject<AgentStatusUpdate>();
-
-  /** Tracks the current connection state. Emits true when connected. */
-  private readonly connectedSubject = new BehaviorSubject<boolean>(false);
-
-  /** Subscription for auto-reconnect attempts. */
-  private reconnectSubscription: Subscription | null = null;
-
-  // ── Public Observables ──────────────────────────────────────
-
-  /** Observable that emits agent status updates pushed from the server. */
-  readonly statusUpdates$: Observable<AgentStatusUpdate> =
-    this.statusUpdateSubject.asObservable();
-
-  /** Observable that emits the current connection state (true = connected). */
-  readonly connected$: Observable<boolean> =
-    this.connectedSubject.asObservable();
-
-  // ── Lifecycle ───────────────────────────────────────────────
-
-  /** @inheritdoc */
-  ngOnDestroy(): void {
-    this.stopConnection();
-  }
-
-  // ── Connection Management ───────────────────────────────────
-
-  /**
-   * Starts the SignalR connection to the agent status hub.
-   * Safe to call multiple times — no-ops if already connected.
-   */
-  async startConnection(): Promise<void> {
-    if (this.hubConnection) {
-      return; // Already initialized
-    }
-
-    this.hubConnection = new signalR.HubConnectionBuilder()
-      .withUrl(this.hubUrl)
-      .withAutomaticReconnect([0, 2000, 5000, 10000, 30000])
-      .configureLogging(signalR.LogLevel.Information)
-      .build();
-
-    // Register server-to-client handlers
-    this.registerHandlers(this.hubConnection);
-
-    // Wire up lifecycle events
-    this.hubConnection.onreconnecting(() => {
-      console.warn('[AgentStatusService] Reconnecting to hub…');
-      this.connectedSubject.next(false);
-    });
-
-    this.hubConnection.onreconnected(() => {
-      console.info('[AgentStatusService] Reconnected to hub.');
-      this.connectedSubject.next(true);
-    });
-
-    this.hubConnection.onclose((error) => {
-      console.error('[AgentStatusService] Hub connection closed.', error);
-      this.connectedSubject.next(false);
-    });
-
-    try {
-      await this.hubConnection.start();
-      this.connectedSubject.next(true);
-      console.info('[AgentStatusService] Connected to hub at', this.hubUrl);
-    } catch (err) {
-      console.error('[AgentStatusService] Failed to connect to hub:', err);
-      this.connectedSubject.next(false);
-    }
-  }
-
-  /**
-   * Stops the SignalR connection and cleans up resources.
-   */
-  async stopConnection(): Promise<void> {
-    if (this.hubConnection) {
-      await this.hubConnection.stop();
-      this.hubConnection = null;
-      this.connectedSubject.next(false);
-    }
-    this.reconnectSubscription?.unsubscribe();
-    this.reconnectSubscription = null;
-  }
-
-  // ── Convenience Alias ────────────────────────────────────────
-
-  /**
-   * Alias for `statusUpdates$` — matches the interface described in CUB-58.
-   * Returns an Observable that emits every time the server pushes a
-   * status update for an agent.
-   */
-  onStatusUpdate(): Observable<AgentStatusUpdate> {
-    return this.statusUpdates$;
-  }
-
-  // ── Private Helpers ─────────────────────────────────────────
-
-  /**
-   * Registers handlers for server-to-client calls on the hub connection.
-   */
-  private registerHandlers(connection: signalR.HubConnection): void {
-    // Agent status changed — full update payload
-    connection.on('AgentStatusChanged', (agentId: string, status: string, lastSeenAt: string | null) => {
-      const update: AgentStatusUpdate = { agentId, status, lastSeenAt };
-      console.info('[AgentStatusService] Status update received:', update);
-      this.statusUpdateSubject.next(update);
-    });
-
-    // Generic broadcast for testing — logs to console per CUB-58 DoD
-    connection.on('BroadcastMessage', (message: string) => {
-      console.info('[AgentStatusService] Broadcast message:', message);
-    });
-  }
-}

frontend/src/app/services/index.ts

@@ -1,7 +0,0 @@
-/**
- * Barrel file for agent status services and models.
- * Re-export public API from this module for clean imports.
- */
-export { AgentStatusService } from './agent-status.service';
-export { provideAgentStatusInitializer } from './agent-status-initializer';
-export { AgentStatusUpdate } from '../models/agent-status';

frontend/src/index.html

@@ -1,13 +0,0 @@
-<!doctype html>
-<html lang="en">
-<head>
-  <meta charset="utf-8">
-  <title>Frontend</title>
-  <base href="/">
-  <meta name="viewport" content="width=device-width, initial-scale=1">
-  <link rel="icon" type="image/x-icon" href="favicon.ico">
-</head>
-<body>
-  <app-root></app-root>
-</body>
-</html>

frontend/src/main.ts

@@ -1,6 +0,0 @@
-import { bootstrapApplication } from '@angular/platform-browser';
-import { appConfig } from './app/app.config';
-import { AppComponent } from './app/app.component';
-
-bootstrapApplication(AppComponent, appConfig)
-  .catch((err) => console.error(err));

frontend/src/styles.scss

@@ -1 +0,0 @@
-/* You can add global styles to this file, and also import other style files */

frontend/tsconfig.app.json

@@ -1,14 +0,0 @@
-/* To learn more about this file see: https://angular.io/config/tsconfig. */
-{
-  "extends": "./tsconfig.json",
-  "compilerOptions": {
-    "outDir": "./out-tsc/app",
-    "types": []
-  },
-  "files": [
-    "src/main.ts"
-  ],
-  "include": [
-    "src/**/*.d.ts"
-  ]
-}

frontend/tsconfig.json

@@ -1,32 +0,0 @@
-/* To learn more about this file see: https://angular.io/config/tsconfig. */
-{
-  "compileOnSave": false,
-  "compilerOptions": {
-    "outDir": "./dist/out-tsc",
-    "strict": true,
-    "noImplicitOverride": true,
-    "noPropertyAccessFromIndexSignature": true,
-    "noImplicitReturns": true,
-    "noFallthroughCasesInSwitch": true,
-    "skipLibCheck": true,
-    "esModuleInterop": true,
-    "sourceMap": true,
-    "declaration": false,
-    "experimentalDecorators": true,
-    "moduleResolution": "node",
-    "importHelpers": true,
-    "target": "ES2022",
-    "module": "ES2022",
-    "useDefineForClassFields": false,
-    "lib": [
-      "ES2022",
-      "dom"
-    ]
-  },
-  "angularCompilerOptions": {
-    "enableI18nLegacyMessageIdFormat": false,
-    "strictInjectionParameters": true,
-    "strictInputAccessModifiers": true,
-    "strictTemplates": true
-  }
-}

frontend/tsconfig.spec.json

@@ -1,14 +0,0 @@
-/* To learn more about this file see: https://angular.io/config/tsconfig. */
-{
-  "extends": "./tsconfig.json",
-  "compilerOptions": {
-    "outDir": "./out-tsc/spec",
-    "types": [
-      "jasmine"
-    ]
-  },
-  "include": [
-    "src/**/*.spec.ts",
-    "src/**/*.d.ts"
-  ]
-}