Feature: Add Settings page with centralized AI model configuration

- Add Settings page for AI model selection with load status indicators
- Add ModelWarmupService to preload configured model on app startup
- Consolidate AI model config to single AI:ReceiptParsingModel setting
- Simplify ViewReceipt and AICategorizePreview to use Settings model
- Improve AI categorization confidence prompt for varied scores

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

MoneyMap/Pages/AICategorizePreview.cshtml

@@ -36,25 +36,10 @@
                     {
                         <input type="hidden" name="transactionIds" value="@id" />
                     }
-                    @if (Model.AIProvider.Equals("LlamaCpp", StringComparison.OrdinalIgnoreCase) && Model.AvailableModels.Any())
+                    <p class="text-muted small mb-3">
-                    {
+                        Using: <strong>@Model.SelectedModel</strong>
-                        <div class="mb-3" style="max-width: 400px;">
+                        <a href="/Settings" class="ms-2 small">Change</a>
-                            <label for="model" class="form-label">Model</label>
+                    </p>
-                            <select name="model" id="model" class="form-select">
-                                @foreach (var m in Model.AvailableModels)
-                                {
-                                    var isSelected = m.Id == Model.SelectedModel;
-                                    <option value="@m.Id" selected="@isSelected">
-                                        @(m.IsLoaded ? "● " : "○ ")@m.Id
-                                    </option>
-                                }
-                            </select>
-                            <div class="form-text">
-                                <span style="color: #28a745;">●</span> Loaded
-                                <span class="ms-2" style="color: #6c757d;">○</span> Not loaded
-                            </div>
-                        </div>
-                    }
                     <button type="submit" class="btn btn-primary">
                         Generate Suggestions for @Model.SelectedTransactionCount Transaction(s)
                     </button>
@@ -66,25 +51,10 @@
 
                 <form method="post" asp-page-handler="Generate"
                       onsubmit="this.querySelector('button[type=submit]').disabled = true; this.querySelector('button[type=submit]').innerHTML = '<span class=\'spinner-border spinner-border-sm me-2\'></span>Analyzing transactions...';">
-                    @if (Model.AIProvider.Equals("LlamaCpp", StringComparison.OrdinalIgnoreCase) && Model.AvailableModels.Any())
+                    <p class="text-muted small mb-3">
-                    {
+                        Using: <strong>@Model.SelectedModel</strong>
-                        <div class="mb-3" style="max-width: 400px;">
+                        <a href="/Settings" class="ms-2 small">Change</a>
-                            <label for="model" class="form-label">Model</label>
+                    </p>
-                            <select name="model" id="model" class="form-select">
-                                @foreach (var m in Model.AvailableModels)
-                                {
-                                    var isSelected = m.Id == Model.SelectedModel;
-                                    <option value="@m.Id" selected="@isSelected">
-                                        @(m.IsLoaded ? "● " : "○ ")@m.Id
-                                    </option>
-                                }
-                            </select>
-                            <div class="form-text">
-                                <span style="color: #28a745;">●</span> Loaded
-                                <span class="ms-2" style="color: #6c757d;">○</span> Not loaded
-                            </div>
-                        </div>
-                    }
                     <button type="submit" class="btn btn-primary">
                         Generate Suggestions (up to 50 uncategorized)
                     </button>

MoneyMap/Pages/AICategorizePreview.cshtml.cs

@@ -12,26 +12,22 @@ namespace MoneyMap.Pages
     {
         private readonly MoneyMapContext _db;
         private readonly ITransactionAICategorizer _aiCategorizer;
-        private readonly LlamaCppVisionClient _llamaClient;
         private readonly IConfiguration _config;
 
         public AICategorizePreviewModel(
             MoneyMapContext db,
             ITransactionAICategorizer aiCategorizer,
-            LlamaCppVisionClient llamaClient,
             IConfiguration config)
         {
             _db = db;
             _aiCategorizer = aiCategorizer;
-            _llamaClient = llamaClient;
             _config = config;
         }
 
         public List<ProposalViewModel> Proposals { get; set; } = new();
         public string ModelUsed { get; set; } = "";
         public string AIProvider => _config["AI:CategorizationProvider"] ?? "OpenAI";
-        public List<LlamaCppModel> AvailableModels { get; set; } = new();
+        public string SelectedModel => _config["AI:ReceiptParsingModel"] ?? "gpt-4o-mini";
-        public string SelectedModel => _config["AI:CategorizationModel"] ?? "qwen2.5-coder-32b-instruct-q6_k";
 
         [TempData]
         public string? StoredTransactionIds { get; set; }
@@ -51,12 +47,6 @@ namespace MoneyMap.Pages
 
         public async Task<IActionResult> OnGetAsync()
         {
-            // Load models for the dropdown
-            if (AIProvider.Equals("LlamaCpp", StringComparison.OrdinalIgnoreCase))
-            {
-                AvailableModels = await _llamaClient.GetAvailableModelsAsync();
-            }
-
             // Load transaction IDs from TempData if available
             if (!string.IsNullOrEmpty(StoredTransactionIds))
             {
@@ -96,7 +86,7 @@ namespace MoneyMap.Pages
             return RedirectToPage();
         }
 
-        public async Task<IActionResult> OnPostGenerateAsync(string? model)
+        public async Task<IActionResult> OnPostGenerateAsync()
         {
             var uncategorized = await _db.Transactions
                 .Include(t => t.Card)
@@ -114,7 +104,7 @@ namespace MoneyMap.Pages
                 return RedirectToPage("/Recategorize");
             }
 
-            var proposals = await _aiCategorizer.ProposeBatchCategorizationAsync(uncategorized, model);
+            var proposals = await _aiCategorizer.ProposeBatchCategorizationAsync(uncategorized, SelectedModel);
 
             if (proposals.Count == 0)
             {
@@ -136,12 +126,12 @@ namespace MoneyMap.Pages
             }).ToList();
 
             ProposalsJson = JsonSerializer.Serialize(storedProposals);
-            ModelUsed = model ?? SelectedModel;
+            ModelUsed = SelectedModel;
 
             return RedirectToPage();
         }
 
-        public async Task<IActionResult> OnPostGenerateForIdsAsync(long[]? transactionIds, string? model)
+        public async Task<IActionResult> OnPostGenerateForIdsAsync(long[]? transactionIds)
         {
             // Try to get IDs from form first, then from TempData
             if ((transactionIds == null || transactionIds.Length == 0) && !string.IsNullOrEmpty(StoredTransactionIds))
@@ -171,7 +161,7 @@ namespace MoneyMap.Pages
                 return RedirectToPage("/Transactions");
             }
 
-            var proposals = await _aiCategorizer.ProposeBatchCategorizationAsync(transactions, model);
+            var proposals = await _aiCategorizer.ProposeBatchCategorizationAsync(transactions, SelectedModel);
 
             if (proposals.Count == 0)
             {
@@ -193,7 +183,7 @@ namespace MoneyMap.Pages
             }).ToList();
 
             ProposalsJson = JsonSerializer.Serialize(storedProposals);
-            ModelUsed = model ?? SelectedModel;
+            ModelUsed = SelectedModel;
 
             return RedirectToPage();
         }

MoneyMap/Pages/Settings.cshtml

@@ -0,0 +1,93 @@
+@page
+@model MoneyMap.Pages.SettingsModel
+@{
+    ViewData["Title"] = "Settings";
+}
+
+<h2 class="mb-4">Settings</h2>
+
+@if (!string.IsNullOrEmpty(Model.SuccessMessage))
+{
+    <div class="alert alert-success alert-dismissible fade show" role="alert">
+        @Model.SuccessMessage
+        <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
+    </div>
+}
+
+@if (!string.IsNullOrEmpty(Model.ErrorMessage))
+{
+    <div class="alert alert-danger alert-dismissible fade show" role="alert">
+        @Model.ErrorMessage
+        <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
+    </div>
+}
+
+<div class="row">
+    <div class="col-lg-6">
+        <div class="card shadow-sm mb-4">
+            <div class="card-header">
+                <strong>AI Model Configuration</strong>
+            </div>
+            <div class="card-body">
+                <p class="text-muted small mb-3">
+                    Select the AI model to use for receipt parsing and other AI features.
+                    Models with <span style="color: #28a745;">●</span> are currently loaded and ready.
+                </p>
+
+                <form method="post" asp-page-handler="SaveModel">
+                    <div class="mb-3">
+                        <label for="model" class="form-label">Receipt Parsing Model</label>
+                        <select name="model" id="model" class="form-select">
+                            <optgroup label="Local Models (LlamaCpp)">
+                                @foreach (var m in Model.AvailableModels)
+                                {
+                                    var modelValue = $"llamacpp:{m.Id}";
+                                    var isSelected = Model.SelectedModel == modelValue;
+                                    <option value="@modelValue" selected="@isSelected">
+                                        @(m.IsLoaded ? "● " : "○ ")@m.Id
+                                    </option>
+                                }
+                            </optgroup>
+                            <optgroup label="OpenAI">
+                                <option value="gpt-4o-mini" selected="@(Model.SelectedModel == "gpt-4o-mini")">GPT-4o Mini</option>
+                                <option value="gpt-4o" selected="@(Model.SelectedModel == "gpt-4o")">GPT-4o</option>
+                            </optgroup>
+                            <optgroup label="Anthropic">
+                                <option value="claude-3-5-haiku-20241022" selected="@(Model.SelectedModel == "claude-3-5-haiku-20241022")">Claude 3.5 Haiku</option>
+                                <option value="claude-3-5-sonnet-20241022" selected="@(Model.SelectedModel == "claude-3-5-sonnet-20241022")">Claude 3.5 Sonnet</option>
+                            </optgroup>
+                        </select>
+                        <div class="form-text">
+                            <span style="color: #28a745;">●</span> Loaded
+                            <span class="ms-2" style="color: #6c757d;">○</span> Not loaded
+                        </div>
+                    </div>
+
+                    <div class="d-flex gap-2">
+                        <button type="submit" class="btn btn-primary">
+                            Save Selection
+                        </button>
+                        <button type="submit" formaction="/Settings?handler=LoadModel" class="btn btn-outline-secondary">
+                            Save & Load Model
+                        </button>
+                    </div>
+                </form>
+            </div>
+        </div>
+
+        <div class="card shadow-sm">
+            <div class="card-header">
+                <strong>Connection Settings</strong>
+            </div>
+            <div class="card-body">
+                <dl class="row mb-0">
+                    <dt class="col-sm-4">Models Endpoint</dt>
+                    <dd class="col-sm-8"><code>@Model.ModelsEndpoint</code></dd>
+                </dl>
+                <p class="text-muted small mt-2 mb-0">
+                    Configure in <code>appsettings.json</code> under <code>AI:ModelsEndpoint</code>
+                </p>
+            </div>
+        </div>
+    </div>
+</div>

MoneyMap/Pages/Settings.cshtml.cs

@@ -0,0 +1,114 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using MoneyMap.Services;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+
+namespace MoneyMap.Pages
+{
+    public class SettingsModel : PageModel
+    {
+        private readonly LlamaCppVisionClient _llamaClient;
+        private readonly IConfiguration _config;
+        private readonly IWebHostEnvironment _env;
+        private readonly ILogger<SettingsModel> _logger;
+
+        public SettingsModel(
+            LlamaCppVisionClient llamaClient,
+            IConfiguration config,
+            IWebHostEnvironment env,
+            ILogger<SettingsModel> logger)
+        {
+            _llamaClient = llamaClient;
+            _config = config;
+            _env = env;
+            _logger = logger;
+        }
+
+        public List<LlamaCppModel> AvailableModels { get; set; } = new();
+        public string SelectedModel => _config["AI:ReceiptParsingModel"] ?? "gpt-4o-mini";
+        public string ModelsEndpoint => _config["AI:ModelsEndpoint"] ?? "http://athena.lan:11434";
+
+        [TempData]
+        public string? SuccessMessage { get; set; }
+
+        [TempData]
+        public string? ErrorMessage { get; set; }
+
+        public async Task OnGetAsync()
+        {
+            AvailableModels = await _llamaClient.GetAvailableModelsAsync();
+        }
+
+        public async Task<IActionResult> OnPostSaveModelAsync(string model)
+        {
+            if (string.IsNullOrEmpty(model))
+            {
+                ErrorMessage = "No model selected.";
+                return RedirectToPage();
+            }
+
+            await SaveSelectedModelAsync(model);
+            SuccessMessage = $"AI model updated to: {model}";
+            return RedirectToPage();
+        }
+
+        public async Task<IActionResult> OnPostLoadModelAsync(string model)
+        {
+            if (string.IsNullOrEmpty(model))
+            {
+                ErrorMessage = "No model selected.";
+                return RedirectToPage();
+            }
+
+            // Save the model first
+            await SaveSelectedModelAsync(model);
+
+            // Fire a warmup request in the background (don't await)
+            _ = WarmupModelAsync(model);
+
+            SuccessMessage = $"Model {model} is being loaded. This may take a moment.";
+            return RedirectToPage();
+        }
+
+        private async Task WarmupModelAsync(string model)
+        {
+            try
+            {
+                _logger.LogInformation("Warming up model: {Model}", model);
+                await _llamaClient.SendTextPromptAsync("Hello", model);
+                _logger.LogInformation("Model warmup completed: {Model}", model);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogWarning(ex, "Model warmup failed for {Model}: {Message}", model, ex.Message);
+            }
+        }
+
+        private async Task SaveSelectedModelAsync(string model)
+        {
+            try
+            {
+                var appSettingsPath = Path.Combine(_env.ContentRootPath, "appsettings.json");
+                var json = await System.IO.File.ReadAllTextAsync(appSettingsPath);
+                var jsonNode = JsonNode.Parse(json);
+
+                if (jsonNode == null) return;
+
+                if (jsonNode["AI"] == null)
+                {
+                    jsonNode["AI"] = new JsonObject();
+                }
+
+                jsonNode["AI"]!["ReceiptParsingModel"] = model;
+
+                var options = new JsonSerializerOptions { WriteIndented = true };
+                await System.IO.File.WriteAllTextAsync(appSettingsPath, jsonNode.ToJsonString(options));
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Failed to save model selection: {Message}", ex.Message);
+            }
+        }
+    }
+}

MoneyMap/Pages/ViewReceipt.cshtml

@@ -144,7 +144,7 @@
             </div>
         </div>
 
-        <!-- Parser Selection -->
+        <!-- Parse Receipt -->
         <div class="card shadow-sm mb-3">
             <div class="card-header">
                 <strong>Parse Receipt</strong>
@@ -153,36 +153,11 @@
                 @if (Model.AvailableParsers.Any())
                 {
                     <form method="post" asp-page-handler="Parse" asp-route-id="@Model.Receipt.Id">
-                        <div class="mb-2">
+                        <input type="hidden" name="parser" value="@Model.AvailableParsers.First().FullName" />
-                            <label for="parser" class="form-label small">Select Parser</label>
+                        <p class="text-muted small mb-2">
-                            <select name="parser" id="parser" class="form-select form-select-sm">
+                            Using: <strong>@Model.SelectedModel</strong>
-                                @foreach (var parser in Model.AvailableParsers)
+                            <a href="/Settings" class="ms-2 small">Change</a>
-                                {
+                        </p>
-                                    <option value="@parser.FullName">@parser.Name</option>
-                                }
-                            </select>
-                        </div>
-                        <div class="mb-2">
-                            <label for="model" class="form-label small">AI Model</label>
-                            <select name="model" id="model" class="form-select form-select-sm">
-                                @foreach (var m in Model.AvailableModels)
-                                {
-                                    var modelValue = $"llamacpp:{m.Id}";
-                                    var isSelected = Model.SelectedModel == modelValue;
-                                    <option value="@modelValue" selected="@isSelected">
-                                        @(m.IsLoaded ? "● " : "○ ")@m.Id
-                                    </option>
-                                }
-                                <option value="gpt-4o-mini" selected="@(Model.SelectedModel == "gpt-4o-mini")">GPT-4o Mini</option>
-                                <option value="gpt-4o" selected="@(Model.SelectedModel == "gpt-4o")">GPT-4o</option>
-                                <option value="claude-3-5-haiku-20241022" selected="@(Model.SelectedModel == "claude-3-5-haiku-20241022")">Claude 3.5 Haiku</option>
-                                <option value="claude-3-5-sonnet-20241022" selected="@(Model.SelectedModel == "claude-3-5-sonnet-20241022")">Claude 3.5 Sonnet</option>
-                            </select>
-                            <div class="form-text small">
-                                <span style="color: #28a745;">●</span> Loaded
-                                <span class="ms-2" style="color: #6c757d;">○</span> Not loaded
-                            </div>
-                        </div>
                         <button type="submit" class="btn btn-primary btn-sm w-100">
                             Parse Receipt
                         </button>

MoneyMap/Pages/ViewReceipt.cshtml.cs

@@ -4,8 +4,6 @@ using Microsoft.EntityFrameworkCore;
 using MoneyMap.Data;
 using MoneyMap.Models;
 using MoneyMap.Services;
-using System.Text.Json;
-using System.Text.Json.Nodes;
 
 namespace MoneyMap.Pages
 {
@@ -14,31 +12,24 @@ namespace MoneyMap.Pages
         private readonly MoneyMapContext _db;
         private readonly IReceiptManager _receiptManager;
         private readonly IEnumerable<IReceiptParser> _parsers;
-        private readonly LlamaCppVisionClient _llamaClient;
         private readonly IConfiguration _config;
-        private readonly IWebHostEnvironment _env;
 
         public ViewReceiptModel(
             MoneyMapContext db,
             IReceiptManager receiptManager,
             IEnumerable<IReceiptParser> parsers,
-            LlamaCppVisionClient llamaClient,
+            IConfiguration config)
-            IConfiguration config,
-            IWebHostEnvironment env)
         {
             _db = db;
             _receiptManager = receiptManager;
             _parsers = parsers;
-            _llamaClient = llamaClient;
             _config = config;
-            _env = env;
         }
 
         public Receipt? Receipt { get; set; }
         public List<ReceiptLineItem> LineItems { get; set; } = new();
         public List<ReceiptParseLog> ParseLogs { get; set; } = new();
         public List<ParserOption> AvailableParsers { get; set; } = new();
-        public List<LlamaCppModel> AvailableModels { get; set; } = new();
         public string ReceiptUrl { get; set; } = "";
         public string SelectedModel => _config["AI:ReceiptParsingModel"] ?? "gpt-4o-mini";
 
@@ -72,9 +63,6 @@ namespace MoneyMap.Pages
                 FullName = p.GetType().Name
             }).ToList();
 
-            // Get available LlamaCpp models
-            AvailableModels = await _llamaClient.GetAvailableModelsAsync();
-
             return Page();
         }
 
@@ -100,7 +88,7 @@ namespace MoneyMap.Pages
             return File(fileBytes, receipt.ContentType);
         }
 
-        public async Task<IActionResult> OnPostParseAsync(long id, string parser, string? model = null)
+        public async Task<IActionResult> OnPostParseAsync(long id, string parser)
         {
             var selectedParser = _parsers.FirstOrDefault(p => p.GetType().Name == parser);
 
@@ -110,13 +98,8 @@ namespace MoneyMap.Pages
                 return RedirectToPage(new { id });
             }
 
-            // Save selected model to config if it changed
+            // Use the configured model from settings
-            if (!string.IsNullOrEmpty(model) && model != SelectedModel)
+            var result = await selectedParser.ParseReceiptAsync(id, SelectedModel);
-            {
-                await SaveSelectedModelAsync(model);
-            }
-
-            var result = await selectedParser.ParseReceiptAsync(id, model);
 
             if (result.IsSuccess)
             {
@@ -130,33 +113,6 @@ namespace MoneyMap.Pages
             return RedirectToPage(new { id });
         }
 
-        private async Task SaveSelectedModelAsync(string model)
-        {
-            try
-            {
-                var appSettingsPath = Path.Combine(_env.ContentRootPath, "appsettings.json");
-                var json = await System.IO.File.ReadAllTextAsync(appSettingsPath);
-                var jsonNode = JsonNode.Parse(json);
-
-                if (jsonNode == null) return;
-
-                // Ensure AI section exists
-                if (jsonNode["AI"] == null)
-                {
-                    jsonNode["AI"] = new JsonObject();
-                }
-
-                jsonNode["AI"]!["ReceiptParsingModel"] = model;
-
-                var options = new JsonSerializerOptions { WriteIndented = true };
-                await System.IO.File.WriteAllTextAsync(appSettingsPath, jsonNode.ToJsonString(options));
-            }
-            catch
-            {
-                // Silently fail - not critical if we can't save the preference
-            }
-        }
-
         public class ParserOption
         {
             public string Name { get; set; } = "";

MoneyMap/Program.cs

@@ -71,6 +71,9 @@ builder.Services.AddScoped<IReceiptParser, AIReceiptParser>();
 // AI categorization service
 builder.Services.AddHttpClient<ITransactionAICategorizer, TransactionAICategorizer>();
 
+// Model warmup service - preloads the configured AI model on startup
+builder.Services.AddHostedService<ModelWarmupService>();
+
 // Financial audit API service
 builder.Services.AddScoped<IFinancialAuditService, FinancialAuditService>();
 

MoneyMap/Services/ModelWarmupService.cs

@@ -0,0 +1,63 @@
+namespace MoneyMap.Services
+{
+    /// <summary>
+    /// Background service that warms up the configured AI model on application startup.
+    /// Sends a simple prompt to preload the model without blocking the UI.
+    /// </summary>
+    public class ModelWarmupService : BackgroundService
+    {
+        private readonly IServiceProvider _serviceProvider;
+        private readonly IConfiguration _configuration;
+        private readonly ILogger<ModelWarmupService> _logger;
+
+        public ModelWarmupService(
+            IServiceProvider serviceProvider,
+            IConfiguration configuration,
+            ILogger<ModelWarmupService> logger)
+        {
+            _serviceProvider = serviceProvider;
+            _configuration = configuration;
+            _logger = logger;
+        }
+
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            var model = _configuration["AI:ReceiptParsingModel"];
+
+            // Only warm up local models (llamacpp: prefix)
+            if (string.IsNullOrEmpty(model) || !model.StartsWith("llamacpp:"))
+            {
+                _logger.LogInformation("Model warmup skipped - configured model is not a local model: {Model}", model ?? "(none)");
+                return;
+            }
+
+            // Small delay to let the app fully start
+            await Task.Delay(TimeSpan.FromSeconds(2), stoppingToken);
+
+            _logger.LogInformation("Starting model warmup for: {Model}", model);
+
+            try
+            {
+                using var scope = _serviceProvider.CreateScope();
+                var llamaClient = scope.ServiceProvider.GetRequiredService<LlamaCppVisionClient>();
+
+                // Send a simple prompt to load the model
+                var result = await llamaClient.SendTextPromptAsync("Hello", model);
+
+                if (result.IsSuccess)
+                {
+                    _logger.LogInformation("Model warmup completed successfully for: {Model}", model);
+                }
+                else
+                {
+                    _logger.LogWarning("Model warmup failed for {Model}: {Error}", model, result.ErrorMessage);
+                }
+            }
+            catch (Exception ex)
+            {
+                // Don't crash the app if warmup fails - just log it
+                _logger.LogWarning(ex, "Model warmup failed for {Model}: {Message}", model, ex.Message);
+            }
+        }
+    }
+}

MoneyMap/Services/TransactionAICategorizer.cs

@@ -243,6 +243,8 @@ public class TransactionAICategorizer : ITransactionAICategorizer
         if (transaction.IsTransfer)
             sb.AppendLine($"- Transfer to: {transaction.TransferToAccount?.DisplayLabel ?? "Unknown"}");
 
+        sb.AppendLine();
+        sb.AppendLine($"Existing categories in this system: {categoryList}");
         sb.AppendLine();
         sb.AppendLine("Provide your analysis in JSON format:");
         sb.AppendLine("{");
@@ -250,13 +252,14 @@ public class TransactionAICategorizer : ITransactionAICategorizer
         sb.AppendLine("  \"canonical_merchant\": \"Clean merchant name (e.g., 'Walmart' from 'WAL-MART #1234')\",");
         sb.AppendLine("  \"pattern\": \"Pattern to match future transactions (e.g., 'WALMART' or 'SUBWAY')\",");
         sb.AppendLine("  \"priority\": 0,");
-        sb.AppendLine("  \"confidence\": 0.95,");
+        sb.AppendLine("  \"confidence\": 0.85,");
         sb.AppendLine("  \"reasoning\": \"Brief explanation\"");
         sb.AppendLine("}");
         sb.AppendLine();
-        sb.AppendLine($"Existing categories in this system: {categoryList}");
+        sb.AppendLine("Guidelines:");
-        sb.AppendLine();
+        sb.AppendLine("- Prefer using existing categories when appropriate");
-        sb.AppendLine("Prefer using existing categories when appropriate. Return ONLY valid JSON, no additional text.");
+        sb.AppendLine("- confidence: Your certainty in this categorization (0.0-1.0). Use ~0.9+ for obvious matches like 'WALMART' -> Groceries. Use ~0.7-0.8 for likely matches. Use ~0.5-0.6 for uncertain/ambiguous transactions.");
+        sb.AppendLine("- Return ONLY valid JSON, no additional text.");
 
         return sb.ToString();
     }
@@ -325,7 +328,7 @@ public class TransactionAICategorizer : ITransactionAICategorizer
     {
         try
         {
-            var selectedModel = model ?? _config["AI:CategorizationModel"] ?? "qwen2.5-coder-32b-instruct-q6_k";
+            var selectedModel = model ?? _config["AI:ReceiptParsingModel"] ?? "gpt-4o-mini";
             var systemPrompt = "You are a financial transaction categorization expert. Always respond with valid JSON only.";
             var fullPrompt = $"{systemPrompt}\n\n{prompt}";