feat(ui): wire file and database nest storage

OpenNest.Data/NestRecordFactory.cs

@@ -0,0 +1,45 @@
+using System.Linq;
+
+namespace OpenNest.Data;
+
+/// <summary>
+/// Builds the shareable <see cref="NestRecord"/> metadata from a live <see cref="Nest"/>.
+/// Counts are computed here (not carried on <see cref="Nest"/> itself) so every caller
+/// that saves to the nest server gets the same definition of "plate" and "part" counts.
+/// </summary>
+public static class NestRecordFactory
+{
+    /// <summary>
+    /// Builds a record for uploading <paramref name="nest"/>. <paramref name="id"/> is the
+    /// client-tracked id: <see cref="System.Guid.Empty"/> for a first save (the server
+    /// assigns one), or the previously returned id to update an existing record.
+    /// <paramref name="fileSize"/> is the size of the serialized .nest archive being
+    /// uploaded alongside this record; the server also recomputes it independently.
+    /// </summary>
+    public static NestRecord FromNest(Nest nest, System.Guid id, long fileSize)
+    {
+        ArgumentNullException.ThrowIfNull(nest);
+
+        return new NestRecord
+        {
+            Id = id,
+            Name = nest.Name ?? "",
+            Customer = nest.Customer ?? "",
+            DateCreated = nest.DateCreated,
+            DateModified = nest.DateLastModified,
+            Material = nest.Material?.Name ?? "",
+            Thickness = nest.Thickness,
+            Status = nest.Status,
+            PlateCount = nest.Plates.Count,
+            PartCount = nest.Plates.Sum(CountNonCutoffParts),
+            // Nest has no separate "comments" field; Notes is the closest analog
+            // shown in the nest info dialog, so it round-trips as Comments here.
+            Comments = nest.Notes ?? "",
+            MadeBy = nest.MadeBy ?? "",
+            FileSize = fileSize,
+        };
+    }
+
+    private static int CountNonCutoffParts(Plate plate) =>
+        plate.Parts.Count(part => !part.BaseDrawing.IsCutOff);
+}

OpenNest.Data/NestSaveSession.cs

@@ -0,0 +1,46 @@
+namespace OpenNest.Data;
+
+/// <summary>
+/// Tracks a document's database identity, bound to a particular server address.
+/// A failed upload leaves that identity untouched. Switching servers creates a new
+/// record rather than accidentally updating an unrelated record with the same id.
+/// </summary>
+public sealed class NestSaveSession
+{
+    public Guid RemoteId { get; private set; }
+    public string ServerUrl { get; private set; } = "";
+
+    public void Bind(Guid id, string serverUrl)
+    {
+        if (id == Guid.Empty)
+            throw new ArgumentException("A saved nest needs a non-empty id.", nameof(id));
+        RemoteId = id;
+        ServerUrl = Normalize(serverUrl);
+    }
+
+    public async Task<NestRecord> SaveAsync(
+        INestRepository repository, string serverUrl, Nest nest, byte[] archive,
+        bool saveCopy = false, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(repository);
+        ArgumentNullException.ThrowIfNull(nest);
+        ArgumentNullException.ThrowIfNull(archive);
+
+        var normalizedUrl = Normalize(serverUrl);
+        if (normalizedUrl.Length == 0)
+            throw new ArgumentException("A database server URL is required.", nameof(serverUrl));
+
+        var id = !saveCopy && ServerUrl == normalizedUrl ? RemoteId : Guid.Empty;
+        var record = NestRecordFactory.FromNest(nest, id, archive.LongLength);
+        var saved = id == Guid.Empty
+            ? await repository.UploadAsync(archive, record, cancellationToken)
+            : await repository.UpdateFileAsync(id, archive, record, cancellationToken);
+        if (saved.Id == Guid.Empty || (id != Guid.Empty && saved.Id != id))
+            throw new InvalidDataException("Server returned an invalid nest id.");
+
+        Bind(saved.Id, normalizedUrl);
+        return saved;
+    }
+
+    private static string Normalize(string? url) => (url ?? "").Trim().TrimEnd('/');
+}

OpenNest.Tests/Data/NestRecordFactoryTests.cs

@@ -0,0 +1,82 @@
+using OpenNest.Data;
+
+using Vector = OpenNest.Geometry.Vector;
+
+namespace OpenNest.Tests.Data;
+
+public class NestRecordFactoryTests
+{
+    [Fact]
+    public void FromNest_CountsPlatesAndNonCutoffParts()
+    {
+        var nest = new Nest("Job 42")
+        {
+            Customer = "Cozy Cat",
+            Material = new Material("Aluminum"),
+            Thickness = 0.125,
+            Status = NestStatus.ToBeCut,
+            MadeBy = "AJ",
+            Notes = "rush order",
+            DateCreated = new DateTime(2026, 1, 1),
+            DateLastModified = new DateTime(2026, 2, 2),
+        };
+
+        var plate1 = nest.CreatePlate();
+        var drawingA = new Drawing("A");
+        var drawingB = new Drawing("B");
+        nest.Drawings.Add(drawingA);
+        nest.Drawings.Add(drawingB);
+        plate1.Parts.Add(new Part(drawingA));
+        plate1.Parts.Add(new Part(drawingB));
+
+        var plate2 = nest.CreatePlate();
+        var drawingC = new Drawing("C");
+        nest.Drawings.Add(drawingC);
+        plate2.Parts.Add(new Part(drawingC));
+        var cutoff = new CutOff(new Vector(0, 0), CutOffAxis.Vertical);
+        plate2.CutOffs.Add(cutoff);
+        plate2.Parts.Add(new Part(cutoff.Drawing));
+
+        var record = NestRecordFactory.FromNest(nest, Guid.Empty, fileSize: 1024);
+
+        Assert.Equal(Guid.Empty, record.Id);
+        Assert.Equal("Job 42", record.Name);
+        Assert.Equal("Cozy Cat", record.Customer);
+        Assert.Equal("Aluminum", record.Material);
+        Assert.Equal(0.125, record.Thickness);
+        Assert.Equal(NestStatus.ToBeCut, record.Status);
+        Assert.Equal("AJ", record.MadeBy);
+        Assert.Equal("rush order", record.Comments);
+        Assert.Equal(new DateTime(2026, 1, 1), record.DateCreated);
+        Assert.Equal(new DateTime(2026, 2, 2), record.DateModified);
+        Assert.Equal(2, record.PlateCount);
+        // 2 real parts on plate1 + 1 real part on plate2; the cutoff part is excluded.
+        Assert.Equal(3, record.PartCount);
+        Assert.Equal(1024, record.FileSize);
+    }
+
+    [Fact]
+    public void FromNest_EmptyNest_ZeroCounts()
+    {
+        var nest = new Nest("Empty");
+
+        var record = NestRecordFactory.FromNest(nest, Guid.NewGuid(), fileSize: 0);
+
+        Assert.Equal(0, record.PlateCount);
+        Assert.Equal(0, record.PartCount);
+        Assert.Equal("", record.Material);
+        Assert.Equal("", record.Comments);
+        Assert.Equal("", record.MadeBy);
+    }
+
+    [Fact]
+    public void FromNest_PreservesGivenId()
+    {
+        var id = Guid.NewGuid();
+        var nest = new Nest("Keep Id");
+
+        var record = NestRecordFactory.FromNest(nest, id, fileSize: 5);
+
+        Assert.Equal(id, record.Id);
+    }
+}

OpenNest.Tests/Data/NestSaveSessionTests.cs

@@ -0,0 +1,85 @@
+using OpenNest.Data;
+
+namespace OpenNest.Tests.Data;
+
+public class NestSaveSessionTests
+{
+    [Fact]
+    public async Task Save_CreatesThenUpdatesAndSaveCopyCreatesNewRecord()
+    {
+        var repository = new FakeRepository();
+        var session = new NestSaveSession();
+        var nest = new Nest("Shop job");
+        var bytes = new byte[] { 1, 2, 3 };
+
+        await session.SaveAsync(repository, "http://shop:8090/", nest, bytes);
+        var firstId = session.RemoteId;
+        Assert.NotEqual(Guid.Empty, firstId);
+        Assert.Equal(3, repository.LastRecord!.FileSize);
+        Assert.Equal("Shop job", repository.LastRecord.Name);
+        Assert.Equal(1, repository.Uploads);
+
+        await session.SaveAsync(repository, "http://shop:8090", nest, bytes);
+        Assert.Equal(firstId, repository.UpdatedId);
+        Assert.Equal(1, repository.Updates);
+
+        await session.SaveAsync(repository, "http://shop:8090", nest, bytes, saveCopy: true);
+        Assert.NotEqual(firstId, session.RemoteId);
+        Assert.Equal(2, repository.Uploads);
+    }
+
+    [Fact]
+    public async Task FailedSaveAndServerSwitch_NeverOverwritePriorIdentity()
+    {
+        var repository = new FakeRepository();
+        var session = new NestSaveSession();
+        var oldId = Guid.NewGuid();
+        session.Bind(oldId, "http://old:8090");
+        repository.Fail = true;
+
+        await Assert.ThrowsAsync<IOException>(() =>
+            session.SaveAsync(repository, "http://new:8090", new Nest("Job"), [1]));
+        Assert.Equal(oldId, session.RemoteId);
+        Assert.Equal("http://old:8090", session.ServerUrl);
+        Assert.Equal(Guid.Empty, repository.LastRecord!.Id);
+        Assert.Equal(0, repository.Updates);
+
+        repository.Fail = false;
+        await session.SaveAsync(repository, "http://new:8090", new Nest("Job"), [1]);
+        Assert.NotEqual(oldId, session.RemoteId);
+        Assert.Equal("http://new:8090", session.ServerUrl);
+    }
+
+    private sealed class FakeRepository : INestRepository
+    {
+        public int Uploads { get; private set; }
+        public int Updates { get; private set; }
+        public Guid UpdatedId { get; private set; }
+        public NestRecord? LastRecord { get; private set; }
+        public bool Fail { get; set; }
+
+        public Task<NestRecord> UploadAsync(byte[] file, NestRecord record, CancellationToken ct = default)
+        {
+            Uploads++;
+            LastRecord = record;
+            if (Fail) throw new IOException("Offline");
+            record.Id = Guid.NewGuid();
+            return Task.FromResult(record);
+        }
+
+        public Task<NestRecord> UpdateFileAsync(Guid id, byte[] file, NestRecord record, CancellationToken ct = default)
+        {
+            Updates++;
+            UpdatedId = id;
+            LastRecord = record;
+            if (Fail) throw new IOException("Offline");
+            return Task.FromResult(record);
+        }
+
+        public Task<IReadOnlyList<NestRecord>> ListAsync(CancellationToken ct = default) => throw new NotImplementedException();
+        public Task<NestRecord?> GetMetadataAsync(Guid id, CancellationToken ct = default) => throw new NotImplementedException();
+        public Task<byte[]?> GetFileAsync(Guid id, CancellationToken ct = default) => throw new NotImplementedException();
+        public Task<NestRecord> UpdateMetadataAsync(Guid id, NestRecord record, CancellationToken ct = default) => throw new NotImplementedException();
+        public Task DeleteAsync(Guid id, CancellationToken ct = default) => throw new NotImplementedException();
+    }
+}

OpenNest/Document.cs

@@ -1,5 +1,8 @@
 using System;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using OpenNest.Data;
 using OpenNest.IO;
 
 namespace OpenNest
@@ -12,6 +15,12 @@ namespace OpenNest
 
         public string LastSavePath { get; private set; }
 
+        private readonly NestSaveSession remoteSession = new();
+
+        public Guid RemoteId => remoteSession.RemoteId;
+
+        public void BindRemote(Guid id, string serverUrl) => remoteSession.Bind(id, serverUrl);
+
         public string Name => Nest?.Name;
 
         public bool HasSavePath => File.Exists(LastSavePath);
@@ -26,5 +35,25 @@ namespace OpenNest
             var writer = new NestWriter(Nest);
             writer.Write(path);
         }
+
+        /// <summary>Serializes the current nest to a .nest archive in memory.</summary>
+        public byte[] Serialize()
+        {
+            using var stream = new MemoryStream();
+            new NestWriter(Nest).Write(stream);
+            return stream.ToArray();
+        }
+
+        /// <summary>Uploads this nest, preserving its server identity only on success.</summary>
+        public async Task<NestRecord> SaveToDatabaseAsync(
+            INestRepository repository, string serverUrl, bool saveCopy = false,
+            CancellationToken cancellationToken = default)
+        {
+            var bytes = Serialize();
+            var saved = await remoteSession.SaveAsync(
+                repository, serverUrl, Nest, bytes, saveCopy, cancellationToken);
+            LastSaveDate = DateTime.Now;
+            return saved;
+        }
     }
 }

OpenNest/Forms/MainForm.cs

@@ -30,6 +30,10 @@ namespace OpenNest.Forms
         private bool clickUpdateLocation;
         private bool nestingInProgress;
         private CancellationTokenSource nestingCts;
+        private bool databaseSaveInProgress;
+        private bool databaseOpenInProgress;
+        private readonly ToolStripMenuItem storageModeMenu = new("Storage Mode...");
+        private readonly ToolStripMenuItem exportNestMenu = new("Export .nest...");
 
         private const float ZoomInFactor = 1.5f;
         private const float ZoomOutFactor = 1.0f / ZoomInFactor;
@@ -48,6 +52,10 @@ namespace OpenNest.Forms
         public MainForm()
         {
             InitializeComponent();
+            storageModeMenu.Click += StorageMode_Click;
+            exportNestMenu.Click += ExportNest_Click;
+            mnuFile.DropDownItems.Insert(mnuFile.DropDownItems.IndexOf(mnuFileExport), exportNestMenu);
+            mnuFile.DropDownItems.Insert(mnuFile.DropDownItems.IndexOf(mnuFileExit), storageModeMenu);
             UpdateOverlapMenu();
             LoadSettings();
 
@@ -150,9 +158,12 @@ namespace OpenNest.Forms
             return result;
         }
 
-        private void LoadNest(Nest nest, FormWindowState windowState = FormWindowState.Maximized)
+        private void LoadNest(Nest nest, FormWindowState windowState = FormWindowState.Maximized,
+            Guid remoteId = default, string serverUrl = null)
         {
             var editForm = new EditNestForm(nest);
+            if (remoteId != Guid.Empty)
+                editForm.Document.BindRemote(remoteId, serverUrl);
             editForm.MdiParent = this;
             editForm.PlateChanged += (sender, e) =>
             {
@@ -198,10 +209,11 @@ namespace OpenNest.Forms
             var hasValue = activeForm != null;
 
             btnZoomToFit.Enabled = hasValue;
-            mnuFileSave.Enabled = hasValue;
-            btnSave.Enabled = hasValue;
-            btnSaveAs.Enabled = hasValue;
-            mnuFileSaveAs.Enabled = hasValue;
+            mnuFileSave.Enabled = hasValue && !databaseSaveInProgress;
+            btnSave.Enabled = hasValue && !databaseSaveInProgress;
+            btnSaveAs.Enabled = hasValue && !databaseSaveInProgress;
+            mnuFileSaveAs.Enabled = hasValue && !databaseSaveInProgress;
+            exportNestMenu.Enabled = hasValue;
             mnuFileExport.Enabled = hasValue;
             mnuFileExportAll.Enabled = hasValue;
             btnZoomOut.Enabled = hasValue;
@@ -563,21 +575,57 @@ namespace OpenNest.Forms
             LoadNest(nest, windowState);
         }
 
-        private void Open_Click(object sender, EventArgs e)
+        private async void Open_Click(object sender, EventArgs e)
         {
-            var dlg = new OpenFileDialog();
-            dlg.Filter = NestFormat.FileFilter;
-            dlg.Multiselect = true;
-
-            if (dlg.ShowDialog() == DialogResult.OK)
+            if (NestStorage.Settings.Mode == NestStorageMode.File)
             {
-                var reader = new NestReader(dlg.FileName);
-                var nest = reader.Read();
-                LoadNest(nest);
-                if (reader.Warnings.Count > 0)
-                    MessageBox.Show(this, string.Join(Environment.NewLine, reader.Warnings),
-                        "Nest Load Warnings", MessageBoxButtons.OK, MessageBoxIcon.Warning);
+                using var dlg = new OpenFileDialog { Filter = NestFormat.FileFilter, Multiselect = true };
+                if (dlg.ShowDialog(this) == DialogResult.OK)
+                {
+                    var reader = new NestReader(dlg.FileName);
+                    var nest = reader.Read();
+                    LoadNest(nest);
+                    ShowNestWarnings(reader);
+                }
+                return;
             }
+
+            try
+            {
+                var repository = NestStorage.CreateRepository();
+                using var dlg = new SavedNestsForm(repository);
+                if (dlg.ShowDialog(this) != DialogResult.OK)
+                    return;
+
+                var serverUrl = NestStorage.Settings.ServerUrl;
+                databaseOpenInProgress = true;
+                storageModeMenu.Enabled = false;
+                var file = await repository.GetFileAsync(dlg.SelectedId);
+                if (file == null)
+                    throw new FileNotFoundException("This nest no longer exists on the server.");
+                using var stream = new MemoryStream(file);
+                var reader = new NestReader(stream);
+                var nest = reader.Read();
+                LoadNest(nest, remoteId: dlg.SelectedId, serverUrl: serverUrl);
+                ShowNestWarnings(reader);
+            }
+            catch (Exception ex)
+            {
+                ShowStorageError("open", ex);
+            }
+            finally
+            {
+                databaseOpenInProgress = false;
+                if (!IsDisposed)
+                    storageModeMenu.Enabled = !databaseSaveInProgress;
+            }
+        }
+
+        private void ShowNestWarnings(NestReader reader)
+        {
+            if (reader.Warnings.Count > 0)
+                MessageBox.Show(this, string.Join(Environment.NewLine, reader.Warnings),
+                    "Nest Load Warnings", MessageBoxButtons.OK, MessageBoxIcon.Warning);
         }
 
         private void ImportBom_Click(object sender, EventArgs e)
@@ -587,18 +635,99 @@ namespace OpenNest.Forms
             form.ShowDialog(this);
         }
 
-        private void Save_Click(object sender, EventArgs e)
+        private async void Save_Click(object sender, EventArgs e)
         {
-            if (activeForm != null)
-                activeForm.Save();
+            var form = activeForm;
+            if (form == null || databaseSaveInProgress)
+                return;
+            if (NestStorage.Settings.Mode == NestStorageMode.File)
+                form.Save();
+            else
+                await SaveDatabaseAsync(form, saveCopy: false);
         }
 
-        private void SaveAs_Click(object sender, EventArgs e)
+        private async void SaveAs_Click(object sender, EventArgs e)
         {
-            if (activeForm != null)
-                activeForm.SaveAs();
+            var form = activeForm;
+            if (form == null || databaseSaveInProgress)
+                return;
+            if (NestStorage.Settings.Mode == NestStorageMode.File)
+                form.SaveAs();
+            else
+                await SaveDatabaseAsync(form, saveCopy: true);
         }
 
+        private async Task SaveDatabaseAsync(EditNestForm form, bool saveCopy)
+        {
+            databaseSaveInProgress = true;
+            storageModeMenu.Enabled = false;
+            EnableCheck();
+            try
+            {
+                var serverUrl = NestStorage.Settings.ServerUrl;
+                var saved = await form.Document.SaveToDatabaseAsync(
+                    NestStorage.CreateRepository(), serverUrl, saveCopy);
+                if (!form.IsDisposed)
+                    form.Text = form.Document.Name;
+                if (!IsDisposed)
+                    statusLabel1.Text = $"Saved {saved.Name} to nest database";
+            }
+            catch (Exception ex)
+            {
+                if (!IsDisposed)
+                    ShowStorageError("save", ex);
+            }
+            finally
+            {
+                databaseSaveInProgress = false;
+                if (!IsDisposed)
+                {
+                    storageModeMenu.Enabled = !databaseOpenInProgress;
+                    EnableCheck();
+                }
+            }
+        }
+
+        private void StorageMode_Click(object sender, EventArgs e)
+        {
+            using var dlg = new StorageModeForm();
+            if (dlg.ShowDialog(this) != DialogResult.OK)
+                return;
+            try
+            {
+                NestStorage.Save(dlg.SelectedMode, dlg.ServerUrl);
+                statusLabel1.Text = $"Nest storage: {dlg.SelectedMode}";
+            }
+            catch (Exception ex)
+            {
+                ShowStorageError("change storage mode", ex);
+            }
+        }
+
+        private void ExportNest_Click(object sender, EventArgs e)
+        {
+            var form = activeForm;
+            if (form == null)
+                return;
+            using var dlg = new SaveFileDialog { Filter = NestFormat.FileFilter, FileName = form.Nest.Name };
+            if (dlg.ShowDialog(this) != DialogResult.OK)
+                return;
+            try
+            {
+                // Export never changes the document's save path, remote id, or nest name.
+                new NestWriter(form.Nest).Write(dlg.FileName);
+                statusLabel1.Text = $"Exported .nest to {dlg.FileName}";
+            }
+            catch (Exception ex)
+            {
+                ShowStorageError("export", ex);
+            }
+        }
+
+        private void ShowStorageError(string action, Exception ex) =>
+            MessageBox.Show(this, $"Could not {action} nest: {ex.Message}",
+                "Nest Storage", MessageBoxButtons.OK, MessageBoxIcon.Error);
+
         private void Export_Click(object sender, EventArgs e)
         {
             if (activeForm == null)

OpenNest/Forms/NestStorage.cs

@@ -0,0 +1,51 @@
+using System;
+using OpenNest.Data;
+
+namespace OpenNest.Forms
+{
+    /// <summary>
+    /// App-scoped nest storage-mode selection (File vs Database) and the shared
+    /// <see cref="RemoteNestRepository"/> for the configured server. Settings persist
+    /// to %APPDATA%\OpenNest\storage.json via <see cref="NestStorageSettings"/>.
+    /// </summary>
+    public static class NestStorage
+    {
+        private static NestStorageSettings settings =
+            NestStorageSettings.Load(NestStorageSettings.DefaultPath);
+
+        private static RemoteNestRepository cachedRepository;
+        private static string cachedServerUrl;
+
+        /// <summary>Current settings, loaded once at process start.</summary>
+        public static NestStorageSettings Settings => settings;
+
+        /// <summary>
+        /// Persists new settings and invalidates the cached repository so the next
+        /// <see cref="CreateRepository"/> call picks up a changed server URL.
+        /// If persistence fails the current mode remains unchanged.
+        /// </summary>
+        public static void Save(NestStorageMode mode, string serverUrl)
+        {
+            var next = new NestStorageSettings { Mode = mode, ServerUrl = serverUrl };
+            next.Save(NestStorageSettings.DefaultPath);
+            settings = next;
+        }
+
+        /// <summary>
+        /// The shared repository for the current server URL, recreated only when the
+        /// URL changes. Throws <see cref="ArgumentException"/> if the configured URL
+        /// is not a valid absolute http/https address.
+        /// </summary>
+        public static INestRepository CreateRepository()
+        {
+            if (cachedRepository == null || cachedServerUrl != settings.ServerUrl)
+            {
+                cachedRepository?.Dispose();
+                cachedRepository = new RemoteNestRepository(settings.ServerUrl);
+                cachedServerUrl = settings.ServerUrl;
+            }
+
+            return cachedRepository;
+        }
+    }
+}

OpenNest/Forms/SavedNestsForm.cs

@@ -0,0 +1,257 @@
+using System;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using OpenNest.Data;
+
+namespace OpenNest.Forms;
+
+/// <summary>
+/// File &gt; Open (Database mode): lists nests from the shared nest server with
+/// filterable/sortable metadata columns, and lets the operator open or delete one.
+/// </summary>
+public sealed class SavedNestsForm : Form
+{
+    private readonly INestRepository repository;
+    private readonly DataGridView grid;
+    private readonly TextBox searchBox;
+    private readonly Button openButton;
+    private readonly Button deleteButton;
+    private readonly Button refreshButton;
+    private NestRecord[] records = Array.Empty<NestRecord>();
+
+    /// <summary>Set to the chosen record's id when the dialog closes with OK.</summary>
+    public Guid SelectedId { get; private set; }
+
+    public SavedNestsForm(INestRepository repository)
+    {
+        this.repository = repository;
+
+        Text = "Open Nest — Database";
+        StartPosition = FormStartPosition.CenterParent;
+        ClientSize = new Size(880, 480);
+        MinimizeBox = false;
+        MaximizeBox = false;
+        ShowInTaskbar = false;
+
+        var topPanel = new Panel { Dock = DockStyle.Top, Height = 34, Padding = new Padding(6) };
+        var searchLabel = new Label { Text = "Filter:", AutoSize = true, Location = new Point(6, 10) };
+        searchBox = new TextBox { Location = new Point(50, 6), Width = 300 };
+        searchBox.TextChanged += (_, _) => ApplyFilter();
+        refreshButton = new Button { Text = "Refresh", AutoSize = true, Location = new Point(360, 5) };
+        refreshButton.Click += async (_, _) => await LoadAsync();
+        topPanel.Controls.Add(searchLabel);
+        topPanel.Controls.Add(searchBox);
+        topPanel.Controls.Add(refreshButton);
+
+        grid = new DataGridView
+        {
+            Dock = DockStyle.Fill,
+            ReadOnly = true,
+            AllowUserToAddRows = false,
+            AllowUserToDeleteRows = false,
+            SelectionMode = DataGridViewSelectionMode.FullRowSelect,
+            MultiSelect = false,
+            AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.DisplayedCells,
+        };
+        grid.CellDoubleClick += (_, e) =>
+        {
+            if (e.RowIndex >= 0)
+                Open_Click(this, EventArgs.Empty);
+        };
+
+        var buttons = new FlowLayoutPanel
+        {
+            Dock = DockStyle.Bottom,
+            Height = 44,
+            FlowDirection = FlowDirection.RightToLeft,
+            Padding = new Padding(6),
+        };
+        var cancel = new Button { Text = "Cancel", AutoSize = true, DialogResult = DialogResult.Cancel };
+        deleteButton = new Button { Text = "Delete", AutoSize = true, Enabled = false };
+        deleteButton.Click += Delete_Click;
+        openButton = new Button { Text = "Open", AutoSize = true, Enabled = false };
+        openButton.Click += Open_Click;
+        buttons.Controls.Add(cancel);
+        buttons.Controls.Add(openButton);
+        buttons.Controls.Add(deleteButton);
+
+        grid.SelectionChanged += (_, _) =>
+        {
+            var hasSelection = grid.SelectedRows.Count > 0;
+            openButton.Enabled = hasSelection;
+            deleteButton.Enabled = hasSelection;
+        };
+
+        Controls.Add(grid);
+        Controls.Add(topPanel);
+        Controls.Add(buttons);
+        CancelButton = cancel;
+
+        Shown += async (_, _) => await LoadAsync();
+    }
+
+    private async Task LoadAsync()
+    {
+        Cursor = Cursors.WaitCursor;
+        try
+        {
+            var list = await repository.ListAsync();
+            if (IsDisposed)
+                return;
+            records = list.ToArray();
+            ApplyFilter();
+        }
+        catch (Exception ex)
+        {
+            if (!IsDisposed)
+                MessageBox.Show(
+                    this,
+                    $"Could not load nests from the server: {ex.Message}",
+                    "Open Nest — Database",
+                    MessageBoxButtons.OK,
+                    MessageBoxIcon.Error
+                );
+        }
+        finally
+        {
+            if (!IsDisposed)
+                Cursor = Cursors.Default;
+        }
+    }
+
+    private void ApplyFilter()
+    {
+        var filter = searchBox.Text.Trim();
+        var filtered = string.IsNullOrEmpty(filter)
+            ? records
+            : records
+                .Where(r =>
+                    Contains(r.Name, filter)
+                    || Contains(r.Customer, filter)
+                    || Contains(r.Material, filter)
+                    || Contains(r.MadeBy, filter)
+                    || Contains(r.Comments, filter)
+                    || Contains(r.Status.ToString(), filter)
+                    || Contains(FormatStatus(r.Status), filter)
+                    || Contains(r.DateCreated.ToString("g"), filter)
+                    || Contains(r.DateModified.ToString("g"), filter)
+                    || Contains(r.SavedAt.ToString("g"), filter)
+                    || Contains(r.Thickness.ToString(), filter)
+                    || Contains(r.PlateCount.ToString(), filter)
+                    || Contains(r.PartCount.ToString(), filter)
+                    || Contains(r.FileSize.ToString(), filter)
+                )
+                .ToArray();
+
+        Populate(filtered);
+    }
+
+    private static bool Contains(string value, string filter) =>
+        !string.IsNullOrEmpty(value) && value.Contains(filter, StringComparison.OrdinalIgnoreCase);
+
+    private void Populate(NestRecord[] rows)
+    {
+        var table = new DataTable();
+        table.Columns.Add("Name", typeof(string));
+        table.Columns.Add("Customer", typeof(string));
+        table.Columns.Add("Status", typeof(string));
+        table.Columns.Add("Material", typeof(string));
+        table.Columns.Add("Date Created", typeof(DateTime));
+        table.Columns.Add("Date Modified", typeof(DateTime));
+        table.Columns.Add("Thickness", typeof(double));
+        table.Columns.Add("Plates", typeof(int));
+        table.Columns.Add("Parts", typeof(int));
+        table.Columns.Add("Made By", typeof(string));
+        table.Columns.Add("Comments", typeof(string));
+        table.Columns.Add("File Size", typeof(long));
+        table.Columns.Add("Saved", typeof(DateTime));
+        table.Columns.Add("Id", typeof(Guid));
+
+        foreach (var record in rows.OrderByDescending(r => r.SavedAt))
+        {
+            table.Rows.Add(
+                record.Name,
+                record.Customer,
+                FormatStatus(record.Status),
+                record.Material,
+                record.DateCreated,
+                record.DateModified,
+                record.Thickness,
+                record.PlateCount,
+                record.PartCount,
+                record.MadeBy,
+                record.Comments,
+                record.FileSize,
+                record.SavedAt,
+                record.Id
+            );
+        }
+
+        grid.DataSource = table;
+        if (grid.Columns.Contains("Id"))
+            grid.Columns["Id"].Visible = false;
+    }
+
+    private static string FormatStatus(NestStatus status) => status switch
+    {
+        NestStatus.Quote => "Quote",
+        NestStatus.ToBeCut => "To Be Cut",
+        NestStatus.HasBeenCut => "Has Been Cut",
+        _ => status.ToString(),
+    };
+
+    private void Open_Click(object sender, EventArgs e)
+    {
+        if (grid.SelectedRows.Count == 0)
+            return;
+        SelectedId = (Guid)grid.SelectedRows[0].Cells["Id"].Value;
+        DialogResult = DialogResult.OK;
+        Close();
+    }
+
+    private async void Delete_Click(object sender, EventArgs e)
+    {
+        if (grid.SelectedRows.Count == 0)
+            return;
+
+        var id = (Guid)grid.SelectedRows[0].Cells["Id"].Value;
+        var name = grid.SelectedRows[0].Cells["Name"].Value?.ToString() ?? "";
+
+        var confirm = MessageBox.Show(
+            this,
+            $"Delete '{name}' from the server? This cannot be undone.",
+            "Delete Nest",
+            MessageBoxButtons.YesNo,
+            MessageBoxIcon.Warning
+        );
+        if (confirm != DialogResult.Yes)
+            return;
+
+        deleteButton.Enabled = false;
+        try
+        {
+            await repository.DeleteAsync(id);
+            if (!IsDisposed)
+                await LoadAsync();
+        }
+        catch (Exception ex)
+        {
+            if (!IsDisposed)
+                MessageBox.Show(
+                    this,
+                    $"Could not delete the nest: {ex.Message}",
+                    "Delete Nest",
+                    MessageBoxButtons.OK,
+                    MessageBoxIcon.Error
+                );
+        }
+        finally
+        {
+            if (!IsDisposed)
+                deleteButton.Enabled = grid.SelectedRows.Count > 0;
+        }
+    }
+}

OpenNest/Forms/StorageModeForm.cs

@@ -0,0 +1,140 @@
+using System;
+using System.Drawing;
+using System.Windows.Forms;
+using OpenNest.Data;
+
+namespace OpenNest.Forms;
+
+/// <summary>
+/// File &gt; Storage Mode...: choose File mode (local .nest files, the default and
+/// current behavior) or Database mode (Save/Open go through the shared nest server).
+/// </summary>
+public sealed class StorageModeForm : Form
+{
+    private readonly RadioButton fileModeRadio;
+    private readonly RadioButton databaseModeRadio;
+    private readonly TextBox serverUrlBox;
+    private readonly Label serverUrlLabel;
+
+    public StorageModeForm()
+    {
+        Text = "Storage Mode";
+        StartPosition = FormStartPosition.CenterParent;
+        ClientSize = new Size(420, 190);
+        MinimizeBox = false;
+        MaximizeBox = false;
+        ShowInTaskbar = false;
+        FormBorderStyle = FormBorderStyle.FixedDialog;
+
+        var info = new Label
+        {
+            Dock = DockStyle.Top,
+            Height = 40,
+            Padding = new Padding(10, 10, 10, 0),
+            Text = "Database mode shares saved nests with every shop PC through a central server.",
+        };
+
+        fileModeRadio = new RadioButton
+        {
+            Text = "File — save/open local .nest files (default)",
+            AutoSize = true,
+            Location = new Point(14, 54),
+            Checked = true,
+        };
+        databaseModeRadio = new RadioButton
+        {
+            Text = "Database — save/open through a shared nest server",
+            AutoSize = true,
+            Location = new Point(14, 80),
+        };
+
+        serverUrlLabel = new Label
+        {
+            Text = "Server URL:",
+            AutoSize = true,
+            Location = new Point(32, 112),
+            Enabled = false,
+        };
+        serverUrlBox = new TextBox
+        {
+            Location = new Point(110, 108),
+            Width = 280,
+            PlaceholderText = "http://barge.lan:8090",
+            Enabled = false,
+        };
+
+        fileModeRadio.CheckedChanged += (_, _) => UpdateServerUrlEnabled();
+        databaseModeRadio.CheckedChanged += (_, _) => UpdateServerUrlEnabled();
+
+        var buttons = new FlowLayoutPanel
+        {
+            Dock = DockStyle.Bottom,
+            Height = 44,
+            FlowDirection = FlowDirection.RightToLeft,
+            Padding = new Padding(6),
+        };
+        var cancel = new Button { Text = "Cancel", AutoSize = true, DialogResult = DialogResult.Cancel };
+        var ok = new Button { Text = "OK", AutoSize = true };
+        ok.Click += Ok_Click;
+        buttons.Controls.Add(cancel);
+        buttons.Controls.Add(ok);
+
+        Controls.Add(databaseModeRadio);
+        Controls.Add(fileModeRadio);
+        Controls.Add(serverUrlBox);
+        Controls.Add(serverUrlLabel);
+        Controls.Add(info);
+        Controls.Add(buttons);
+
+        AcceptButton = ok;
+        CancelButton = cancel;
+
+        LoadCurrentSettings();
+    }
+
+    public NestStorageMode SelectedMode =>
+        databaseModeRadio.Checked ? NestStorageMode.Database : NestStorageMode.File;
+
+    public string ServerUrl => serverUrlBox.Text.Trim();
+
+    private void LoadCurrentSettings()
+    {
+        var settings = NestStorage.Settings;
+        databaseModeRadio.Checked = settings.Mode == NestStorageMode.Database;
+        fileModeRadio.Checked = !databaseModeRadio.Checked;
+        serverUrlBox.Text = settings.ServerUrl;
+        UpdateServerUrlEnabled();
+    }
+
+    private void UpdateServerUrlEnabled()
+    {
+        serverUrlBox.Enabled = databaseModeRadio.Checked;
+        serverUrlLabel.Enabled = databaseModeRadio.Checked;
+    }
+
+    private void Ok_Click(object sender, EventArgs e)
+    {
+        if (databaseModeRadio.Checked)
+        {
+            var url = ServerUrl;
+            var isValidUrl =
+                Uri.TryCreate(url, UriKind.Absolute, out var uri)
+                && (uri.Scheme == Uri.UriSchemeHttp || uri.Scheme == Uri.UriSchemeHttps);
+
+            if (!isValidUrl)
+            {
+                MessageBox.Show(
+                    this,
+                    "Enter a valid server URL, e.g. http://barge.lan:8090",
+                    "Storage Mode",
+                    MessageBoxButtons.OK,
+                    MessageBoxIcon.Warning
+                );
+                return;
+            }
+        }
+
+        DialogResult = DialogResult.OK;
+        Close();
+    }
+}

docs/nest-storage.md

@@ -4,10 +4,15 @@ The desktop app can save nests two ways:
 
 - **File mode** (default, unchanged behavior): Save/Save As write a `.nest` ZIP
   archive to disk via the normal file dialog. See [nest-file-format.md](nest-file-format.md).
-- **Database mode**: Save uploads the nest to a central `OpenNest.Server`
-  instance shared by every shop PC, instead of writing a local file. A separate
-  **File > Export .nest...** command is always available (in both modes) for
-  producing a local file to share or back up.
+- **Database mode**: Open lists server records with filterable metadata and
+  sortable columns; Save creates a record on first save and updates that same
+  record afterward. Save As creates a new record (a copy). A failed save keeps
+  the previous record association; switching server URLs creates a record on the
+  new server rather than updating an id from the previous one. Delete in the
+  saved-nest list permanently removes the selected server record after confirmation.
+  A separate **File > Export .nest...** command is always available (in both
+  modes) for producing a local file to share or back up. Export does not change
+  the document's file save path or database record association.
 
 The mode and server address are stored per-PC at `%APPDATA%\OpenNest\storage.json`
 (`OpenNest.Data.NestStorageSettings`), defaulting to File mode so existing