Add --reimport and --reprocess-reactions CLI modes

Add flags to reimport all data from archived files or selectively
reprocess reactions. Also replace EnsureCreatedAsync with explicit
database/table existence checks for safer initialization.

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

src/DiscordArchiveManager/Program.cs

@@ -1,6 +1,8 @@
 using DiscordArchiveManager.Data;
 using DiscordArchiveManager.Services;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Storage;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
@@ -32,11 +34,23 @@ var inputDirectory = config["Paths:InputDirectory"] ?? "/app/input";
 var archiveDirectory = config["Paths:ArchiveDirectory"] ?? "/app/archive";
 var imageDirectory = config["Paths:ImageDirectory"] ?? "/app/images";
 
+var reprocessReactions = args.Contains("--reprocess-reactions");
+var reimport = args.Contains("--reimport");
+
 logger.LogInformation("Discord Archive Manager starting...");
 logger.LogInformation("Input directory: {Path}", inputDirectory);
 logger.LogInformation("Archive directory: {Path}", archiveDirectory);
 logger.LogInformation("Image directory: {Path}", imageDirectory);
 
+if (reimport)
+{
+    logger.LogInformation("Mode: Reimport all data from archive");
+}
+else if (reprocessReactions)
+{
+    logger.LogInformation("Mode: Reprocess reactions from archive");
+}
+
 // Ensure directories exist
 Directory.CreateDirectory(inputDirectory);
 Directory.CreateDirectory(archiveDirectory);
@@ -46,54 +60,84 @@ Directory.CreateDirectory(imageDirectory);
 using (var scope = host.Services.CreateScope())
 {
     var context = scope.ServiceProvider.GetRequiredService<DiscordArchiveContext>();
-    logger.LogInformation("Ensuring database exists and applying migrations...");
-    await context.Database.EnsureCreatedAsync();
+    logger.LogInformation("Ensuring database schema exists...");
+
+    // Get the database creator for more control
+    var creator = context.GetService<IRelationalDatabaseCreator>()!;
+
+    if (!await creator.ExistsAsync())
+    {
+        logger.LogError("Database does not exist. Please create it first.");
+        return;
+    }
+
+    if (!await creator.HasTablesAsync())
+    {
+        logger.LogInformation("Creating database tables...");
+        await creator.CreateTablesAsync();
+    }
+
     logger.LogInformation("Database ready.");
 }
 
-// Process files
+// Process files or reprocess reactions
 using (var scope = host.Services.CreateScope())
 {
     var importService = scope.ServiceProvider.GetRequiredService<JsonImportService>();
     var archiveService = scope.ServiceProvider.GetRequiredService<ArchiveService>();
 
-    var files = archiveService.GetExportFiles(inputDirectory).ToList();
-
-    if (files.Count == 0)
+    if (reimport)
     {
-        logger.LogInformation("No JSON files found in input directory.");
+        logger.LogInformation("Reimporting all data from archived files...");
+        var (success, errors) = await importService.ReimportFromArchiveAsync(archiveDirectory, imageDirectory);
+        logger.LogInformation("Reimport complete. Imported: {Success}, Errors: {Errors}", success, errors);
+    }
+    else if (reprocessReactions)
+    {
+        logger.LogInformation("Reprocessing reactions from archived files...");
+        var added = await importService.ReprocessReactionsAsync(archiveDirectory);
+        logger.LogInformation("Reprocessing complete. Added {Count} reactions.", added);
     }
     else
     {
-        logger.LogInformation("Found {Count} JSON files to process.", files.Count);
+        var files = archiveService.GetExportFiles(inputDirectory).ToList();
 
-        var successCount = 0;
-        var skipCount = 0;
-        var errorCount = 0;
-
-        foreach (var file in files)
+        if (files.Count == 0)
         {
-            try
-            {
-                var processed = await importService.ProcessFileAsync(file, imageDirectory, archiveDirectory);
-                if (processed)
-                {
-                    successCount++;
-                }
-                else
-                {
-                    skipCount++;
-                }
-            }
-            catch (Exception ex)
-            {
-                logger.LogError(ex, "Failed to process file: {Path}", file);
-                errorCount++;
-            }
+            logger.LogInformation("No JSON files found in input directory.");
         }
+        else
+        {
+            logger.LogInformation("Found {Count} JSON files to process.", files.Count);
 
-        logger.LogInformation("Processing complete. Processed: {Success}, Skipped: {Skip}, Errors: {Error}",
-            successCount, skipCount, errorCount);
+            var successCount = 0;
+            var skipCount = 0;
+            var errorCount = 0;
+
+            foreach (var file in files)
+            {
+                try
+                {
+                    var processed = await importService.ProcessFileAsync(file, imageDirectory, archiveDirectory);
+                    if (processed)
+                    {
+                        successCount++;
+                    }
+                    else
+                    {
+                        skipCount++;
+                    }
+                }
+                catch (Exception ex)
+                {
+                    logger.LogError(ex, "Failed to process file: {Path}", file);
+                    errorCount++;
+                }
+            }
+
+            logger.LogInformation("Processing complete. Processed: {Success}, Skipped: {Skip}, Errors: {Error}",
+                successCount, skipCount, errorCount);
+        }
     }
 }